/* GNU/Linux native-dependent code common to multiple platforms.
- Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#endif
#include <sys/ptrace.h>
#include "linux-nat.h"
+#include "linux-fork.h"
#include "gdbthread.h"
#include "gdbcmd.h"
#include "regcache.h"
+#include "regset.h"
+#include "inf-ptrace.h"
+#include "auxv.h"
#include <sys/param.h> /* for MAXPATHLEN */
#include <sys/procfs.h> /* for elf_gregset etc. */
#include "elf-bfd.h" /* for elfcore_write_* */
#include "gdbthread.h" /* for struct thread_info etc. */
#include "gdb_stat.h" /* for struct stat */
#include <fcntl.h> /* for O_RDONLY */
+#include "inf-loop.h"
+#include "event-loop.h"
+#include "event-top.h"
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#define __WALL 0x40000000 /* Wait for any child. */
#endif
+#ifndef PTRACE_GETSIGINFO
+#define PTRACE_GETSIGINFO 0x4202
+#endif
+
+/* The single-threaded native GNU/Linux target_ops. We save a pointer for
+ the use of the multi-threaded target. */
+static struct target_ops *linux_ops;
+static struct target_ops linux_ops_saved;
+
+/* The method to call, if any, when a new thread is attached. */
+static void (*linux_nat_new_thread) (ptid_t);
+
+/* The saved to_xfer_partial method, inherited from inf-ptrace.c.
+ Called by our to_xfer_partial. */
+static LONGEST (*super_xfer_partial) (struct target_ops *,
+ enum target_object,
+ const char *, gdb_byte *,
+ const gdb_byte *,
+ ULONGEST, LONGEST);
+
static int debug_linux_nat;
+static void
+show_debug_linux_nat (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"),
+ value);
+}
+
+static int debug_linux_nat_async = 0;
+static void
+show_debug_linux_nat_async (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"),
+ value);
+}
static int linux_parent_pid;
struct simple_pid_list
{
int pid;
+ int status;
struct simple_pid_list *next;
};
struct simple_pid_list *stopped_pids;
static int linux_supports_tracevforkdone_flag = -1;
+/* Async mode support */
+
+/* To listen to target events asynchronously, we install a SIGCHLD
+ handler whose duty is to call waitpid (-1, ..., WNOHANG) to get all
+ the pending events into a pipe. Whenever we're ready to handle
+ events asynchronously, this pipe is registered as the waitable file
+ handle in the event loop. When we get to entry target points
+ coming out of the common code (target_wait, target_resume, ...),
+ that are going to call waitpid, we block SIGCHLD signals, and
+ remove all the events placed in the pipe into a local queue. All
+ the subsequent calls to my_waitpid (a waitpid wrapper) check this
+ local queue first. */
+
+/* True if async mode is currently on. */
+static int linux_nat_async_enabled;
+
+/* Zero if the async mode, although enabled, is masked, which means
+ linux_nat_wait should behave as if async mode was off. */
+static int linux_nat_async_mask_value = 1;
+
+/* The read/write ends of the pipe registered as waitable file in the
+ event loop. */
+static int linux_nat_event_pipe[2] = { -1, -1 };
+
+/* Number of queued events in the pipe. */
+static volatile int linux_nat_num_queued_events;
+
+/* If async mode is on, true if we're listening for events; false if
+ target events are blocked. */
+static int linux_nat_async_events_enabled;
+
+static int linux_nat_async_events (int enable);
+static void pipe_to_local_event_queue (void);
+static void local_event_queue_to_pipe (void);
+static void linux_nat_event_pipe_push (int pid, int status, int options);
+static int linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options);
+static void linux_nat_set_async_mode (int on);
+static void linux_nat_async (void (*callback)
+ (enum inferior_event_type event_type, void *context),
+ void *context);
+static int linux_nat_async_mask (int mask);
+
+/* Captures the result of a successful waitpid call, along with the
+ options used in that call. */
+struct waitpid_result
+{
+ int pid;
+ int status;
+ int options;
+ struct waitpid_result *next;
+};
+
+/* A singly-linked list of the results of the waitpid calls performed
+ in the async SIGCHLD handler. */
+static struct waitpid_result *waitpid_queue = NULL;
+
+static int
+queued_waitpid (int pid, int *status, int flags)
+{
+ struct waitpid_result *msg = waitpid_queue, *prev = NULL;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog,
+ "\
+QWPID: linux_nat_async_events_enabled(%d), linux_nat_num_queued_events(%d)\n",
+ linux_nat_async_events_enabled,
+ linux_nat_num_queued_events);
+
+ if (flags & __WALL)
+ {
+ for (; msg; prev = msg, msg = msg->next)
+ if (pid == -1 || pid == msg->pid)
+ break;
+ }
+ else if (flags & __WCLONE)
+ {
+ for (; msg; prev = msg, msg = msg->next)
+ if (msg->options & __WCLONE
+ && (pid == -1 || pid == msg->pid))
+ break;
+ }
+ else
+ {
+ for (; msg; prev = msg, msg = msg->next)
+ if ((msg->options & __WCLONE) == 0
+ && (pid == -1 || pid == msg->pid))
+ break;
+ }
+
+ if (msg)
+ {
+ int pid;
+
+ if (prev)
+ prev->next = msg->next;
+ else
+ waitpid_queue = msg->next;
+
+ msg->next = NULL;
+ if (status)
+ *status = msg->status;
+ pid = msg->pid;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "QWPID: pid(%d), status(%x)\n",
+ pid, msg->status);
+ xfree (msg);
+
+ return pid;
+ }
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "QWPID: miss\n");
+
+ if (status)
+ *status = 0;
+ return -1;
+}
+
+static void
+push_waitpid (int pid, int status, int options)
+{
+ struct waitpid_result *event, *new_event;
+
+ new_event = xmalloc (sizeof (*new_event));
+ new_event->pid = pid;
+ new_event->status = status;
+ new_event->options = options;
+ new_event->next = NULL;
+
+ if (waitpid_queue)
+ {
+ for (event = waitpid_queue;
+ event && event->next;
+ event = event->next)
+ ;
+
+ event->next = new_event;
+ }
+ else
+ waitpid_queue = new_event;
+}
+
+/* Drain all queued events of PID. If PID is -1, the effect is of
+ draining all events. */
+static void
+drain_queued_events (int pid)
+{
+ while (queued_waitpid (pid, NULL, __WALL) != -1)
+ ;
+}
+
\f
/* Trivial list manipulation functions to keep track of a list of
new stopped processes. */
static void
-add_to_pid_list (struct simple_pid_list **listp, int pid)
+add_to_pid_list (struct simple_pid_list **listp, int pid, int status)
{
struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list));
new_pid->pid = pid;
+ new_pid->status = status;
new_pid->next = *listp;
*listp = new_pid;
}
static int
-pull_pid_from_list (struct simple_pid_list **listp, int pid)
+pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status)
{
struct simple_pid_list **p;
if ((*p)->pid == pid)
{
struct simple_pid_list *next = (*p)->next;
+ *status = (*p)->status;
xfree (*p);
*p = next;
return 1;
return 0;
}
-void
-linux_record_stopped_pid (int pid)
+static void
+linux_record_stopped_pid (int pid, int status)
{
- add_to_pid_list (&stopped_pids, pid);
+ add_to_pid_list (&stopped_pids, pid, status);
}
\f
ptrace (PTRACE_TRACEME, 0, 0, 0);
kill (getpid (), SIGSTOP);
fork ();
- exit (0);
+ _exit (0);
+}
+
+/* Wrapper function for waitpid which handles EINTR, and checks for
+ locally queued events. */
+
+static int
+my_waitpid (int pid, int *status, int flags)
+{
+ int ret;
+
+ /* There should be no concurrent calls to waitpid. */
+ gdb_assert (!linux_nat_async_events_enabled);
+
+ ret = queued_waitpid (pid, status, flags);
+ if (ret != -1)
+ return ret;
+
+ do
+ {
+ ret = waitpid (pid, status, flags);
+ }
+ while (ret == -1 && errno == EINTR);
+
+ return ret;
}
-/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. We
+/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
+
+ First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
+ we know that the feature is not available. This may change the tracing
+ options for ORIGINAL_PID, but we'll be setting them shortly anyway.
+
+ However, if it succeeds, we don't know for sure that the feature is
+ available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
create a child process, attach to it, use PTRACE_SETOPTIONS to enable
- fork tracing, and let it fork. If the process exits, we assume that
- we can't use TRACEFORK; if we get the fork notification, and we can
- extract the new child's PID, then we assume that we can. */
+ fork tracing, and let it fork. If the process exits, we assume that we
+ can't use TRACEFORK; if we get the fork notification, and we can extract
+ the new child's PID, then we assume that we can. */
static void
-linux_test_for_tracefork (void)
+linux_test_for_tracefork (int original_pid)
{
int child_pid, ret, status;
long second_pid;
+ linux_supports_tracefork_flag = 0;
+ linux_supports_tracevforkdone_flag = 0;
+
+ ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK);
+ if (ret != 0)
+ return;
+
child_pid = fork ();
if (child_pid == -1)
- perror_with_name ("linux_test_for_tracefork: fork");
+ perror_with_name (("fork"));
if (child_pid == 0)
linux_tracefork_child ();
- ret = waitpid (child_pid, &status, 0);
+ ret = my_waitpid (child_pid, &status, 0);
if (ret == -1)
- perror_with_name ("linux_test_for_tracefork: waitpid");
+ perror_with_name (("waitpid"));
else if (ret != child_pid)
- error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret);
+ error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret);
if (! WIFSTOPPED (status))
- error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status);
-
- linux_supports_tracefork_flag = 0;
+ error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status);
ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
if (ret != 0)
{
- ptrace (PTRACE_KILL, child_pid, 0, 0);
- waitpid (child_pid, &status, 0);
+ ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
+ if (ret != 0)
+ {
+ warning (_("linux_test_for_tracefork: failed to kill child"));
+ return;
+ }
+
+ ret = my_waitpid (child_pid, &status, 0);
+ if (ret != child_pid)
+ warning (_("linux_test_for_tracefork: failed to wait for killed child"));
+ else if (!WIFSIGNALED (status))
+ warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from "
+ "killed child"), status);
+
return;
}
PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE);
linux_supports_tracevforkdone_flag = (ret == 0);
- ptrace (PTRACE_CONT, child_pid, 0, 0);
- ret = waitpid (child_pid, &status, 0);
+ ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
+ if (ret != 0)
+ warning (_("linux_test_for_tracefork: failed to resume child"));
+
+ ret = my_waitpid (child_pid, &status, 0);
+
if (ret == child_pid && WIFSTOPPED (status)
&& status >> 16 == PTRACE_EVENT_FORK)
{
int second_status;
linux_supports_tracefork_flag = 1;
- waitpid (second_pid, &second_status, 0);
- ptrace (PTRACE_DETACH, second_pid, 0, 0);
+ my_waitpid (second_pid, &second_status, 0);
+ ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
+ if (ret != 0)
+ warning (_("linux_test_for_tracefork: failed to kill second child"));
+ my_waitpid (second_pid, &status, 0);
}
}
+ else
+ warning (_("linux_test_for_tracefork: unexpected result from waitpid "
+ "(%d, status 0x%x)"), ret, status);
- if (WIFSTOPPED (status))
- {
- ptrace (PTRACE_DETACH, child_pid, 0, 0);
- waitpid (child_pid, &status, 0);
- }
+ ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
+ if (ret != 0)
+ warning (_("linux_test_for_tracefork: failed to kill child"));
+ my_waitpid (child_pid, &status, 0);
}
/* Return non-zero iff we have tracefork functionality available.
This function also sets linux_supports_tracefork_flag. */
static int
-linux_supports_tracefork (void)
+linux_supports_tracefork (int pid)
{
if (linux_supports_tracefork_flag == -1)
- linux_test_for_tracefork ();
+ linux_test_for_tracefork (pid);
return linux_supports_tracefork_flag;
}
static int
-linux_supports_tracevforkdone (void)
+linux_supports_tracevforkdone (int pid)
{
if (linux_supports_tracefork_flag == -1)
- linux_test_for_tracefork ();
+ linux_test_for_tracefork (pid);
return linux_supports_tracevforkdone_flag;
}
void
linux_enable_event_reporting (ptid_t ptid)
{
- int pid = ptid_get_pid (ptid);
+ int pid = ptid_get_lwp (ptid);
int options;
- if (! linux_supports_tracefork ())
+ if (pid == 0)
+ pid = ptid_get_pid (ptid);
+
+ if (! linux_supports_tracefork (pid))
return;
options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC
| PTRACE_O_TRACECLONE;
- if (linux_supports_tracevforkdone ())
+ if (linux_supports_tracevforkdone (pid))
options |= PTRACE_O_TRACEVFORKDONE;
/* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
ptrace (PTRACE_SETOPTIONS, pid, 0, options);
}
-void
-child_post_attach (int pid)
+static void
+linux_child_post_attach (int pid)
{
linux_enable_event_reporting (pid_to_ptid (pid));
+ check_for_thread_db ();
}
-void
+static void
linux_child_post_startup_inferior (ptid_t ptid)
{
linux_enable_event_reporting (ptid);
+ check_for_thread_db ();
}
-#ifndef LINUX_CHILD_POST_STARTUP_INFERIOR
-void
-child_post_startup_inferior (ptid_t ptid)
-{
- linux_child_post_startup_inferior (ptid);
-}
-#endif
-
-int
-child_follow_fork (int follow_child)
+static int
+linux_child_follow_fork (struct target_ops *ops, int follow_child)
{
ptid_t last_ptid;
struct target_waitstatus last_status;
int has_vforked;
int parent_pid, child_pid;
+ if (target_can_async_p ())
+ target_async (NULL, 0);
+
get_last_target_status (&last_ptid, &last_status);
has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED);
- parent_pid = ptid_get_pid (last_ptid);
+ parent_pid = ptid_get_lwp (last_ptid);
+ if (parent_pid == 0)
+ parent_pid = ptid_get_pid (last_ptid);
child_pid = last_status.value.related_pid;
if (! follow_child)
also, but they'll be reinserted below. */
detach_breakpoints (child_pid);
- fprintf_filtered (gdb_stdout,
- "Detaching after fork from child process %d.\n",
- child_pid);
+ /* Detach new forked process? */
+ if (detach_fork)
+ {
+ if (info_verbose || debug_linux_nat)
+ {
+ target_terminal_ours ();
+ fprintf_filtered (gdb_stdlog,
+ "Detaching after fork from child process %d.\n",
+ child_pid);
+ }
- ptrace (PTRACE_DETACH, child_pid, 0, 0);
+ ptrace (PTRACE_DETACH, child_pid, 0, 0);
+ }
+ else
+ {
+ struct fork_info *fp;
+ /* Retain child fork in ptrace (stopped) state. */
+ fp = find_fork_pid (child_pid);
+ if (!fp)
+ fp = add_fork (child_pid);
+ fork_save_infrun_state (fp, 0);
+ }
if (has_vforked)
{
- if (linux_supports_tracevforkdone ())
+ gdb_assert (linux_supports_tracefork_flag >= 0);
+ if (linux_supports_tracevforkdone (0))
{
int status;
ptrace (PTRACE_CONT, parent_pid, 0, 0);
- waitpid (parent_pid, &status, __WALL);
+ my_waitpid (parent_pid, &status, __WALL);
if ((status >> 16) != PTRACE_EVENT_VFORK_DONE)
- warning ("Unexpected waitpid result %06x when waiting for "
- "vfork-done", status);
+ warning (_("Unexpected waitpid result %06x when waiting for "
+ "vfork-done"), status);
}
else
{
/* Before detaching from the parent, remove all breakpoints from it. */
remove_breakpoints ();
- fprintf_filtered (gdb_stdout,
- "Attaching after fork to child process %d.\n",
- child_pid);
+ if (info_verbose || debug_linux_nat)
+ {
+ target_terminal_ours ();
+ fprintf_filtered (gdb_stdlog,
+ "Attaching after fork to child process %d.\n",
+ child_pid);
+ }
/* If we're vforking, we may want to hold on to the parent until
the child exits or execs. At exec time we can remove the old
if (has_vforked)
linux_parent_pid = parent_pid;
- else
- target_detach (NULL, 0);
-
- inferior_ptid = pid_to_ptid (child_pid);
- push_target (&deprecated_child_ops);
-
- /* Reset breakpoints in the child as appropriate. */
- follow_inferior_reset_breakpoints ();
- }
-
- return 0;
-}
-
-ptid_t
-linux_handle_extended_wait (int pid, int status,
- struct target_waitstatus *ourstatus)
-{
- int event = status >> 16;
-
- if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK
- || event == PTRACE_EVENT_CLONE)
- {
- unsigned long new_pid;
- int ret;
-
- ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid);
-
- /* If we haven't already seen the new PID stop, wait for it now. */
- if (! pull_pid_from_list (&stopped_pids, new_pid))
+ else if (!detach_fork)
{
- /* The new child has a pending SIGSTOP. We can't affect it until it
- hits the SIGSTOP, but we're already attached. */
- do {
- ret = waitpid (new_pid, &status,
- (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0);
- } while (ret == -1 && errno == EINTR);
- if (ret == -1)
- perror_with_name ("waiting for new child");
- else if (ret != new_pid)
- internal_error (__FILE__, __LINE__,
- "wait returned unexpected PID %d", ret);
- else if (!WIFSTOPPED (status) || WSTOPSIG (status) != SIGSTOP)
- internal_error (__FILE__, __LINE__,
- "wait returned unexpected status 0x%x", status);
+ struct fork_info *fp;
+ /* Retain parent fork in ptrace (stopped) state. */
+ fp = find_fork_pid (parent_pid);
+ if (!fp)
+ fp = add_fork (parent_pid);
+ fork_save_infrun_state (fp, 0);
}
-
- if (event == PTRACE_EVENT_FORK)
- ourstatus->kind = TARGET_WAITKIND_FORKED;
- else if (event == PTRACE_EVENT_VFORK)
- ourstatus->kind = TARGET_WAITKIND_VFORKED;
else
- ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
-
- ourstatus->value.related_pid = new_pid;
- return inferior_ptid;
- }
+ target_detach (NULL, 0);
- if (event == PTRACE_EVENT_EXEC)
- {
- ourstatus->kind = TARGET_WAITKIND_EXECD;
- ourstatus->value.execd_pathname
- = xstrdup (child_pid_to_exec_file (pid));
+ inferior_ptid = ptid_build (child_pid, child_pid, 0);
- if (linux_parent_pid)
- {
- detach_breakpoints (linux_parent_pid);
- ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0);
+ /* Reinstall ourselves, since we might have been removed in
+ target_detach (which does other necessary cleanup). */
- linux_parent_pid = 0;
- }
+ push_target (ops);
+ linux_nat_switch_fork (inferior_ptid);
+ check_for_thread_db ();
- return inferior_ptid;
+ /* Reset breakpoints in the child as appropriate. */
+ follow_inferior_reset_breakpoints ();
}
- internal_error (__FILE__, __LINE__,
- "unknown ptrace event %d", event);
-}
-
-\f
-int
-child_insert_fork_catchpoint (int pid)
-{
- if (! linux_supports_tracefork ())
- error ("Your system does not support fork catchpoints.");
+ if (target_can_async_p ())
+ target_async (inferior_event_handler, 0);
return 0;
}
-int
-child_insert_vfork_catchpoint (int pid)
+\f
+static void
+linux_child_insert_fork_catchpoint (int pid)
{
- if (!linux_supports_tracefork ())
- error ("Your system does not support vfork catchpoints.");
-
- return 0;
+ if (! linux_supports_tracefork (pid))
+ error (_("Your system does not support fork catchpoints."));
}
-int
-child_insert_exec_catchpoint (int pid)
+static void
+linux_child_insert_vfork_catchpoint (int pid)
{
- if (!linux_supports_tracefork ())
- error ("Your system does not support exec catchpoints.");
-
- return 0;
+ if (!linux_supports_tracefork (pid))
+ error (_("Your system does not support vfork catchpoints."));
}
-void
-kill_inferior (void)
+static void
+linux_child_insert_exec_catchpoint (int pid)
{
- int status;
- int pid = PIDGET (inferior_ptid);
- struct target_waitstatus last;
- ptid_t last_ptid;
- int ret;
-
- if (pid == 0)
- return;
-
- /* If we're stopped while forking and we haven't followed yet, kill the
- other task. We need to do this first because the parent will be
- sleeping if this is a vfork. */
-
- get_last_target_status (&last_ptid, &last);
-
- if (last.kind == TARGET_WAITKIND_FORKED
- || last.kind == TARGET_WAITKIND_VFORKED)
- {
- ptrace (PT_KILL, last.value.related_pid, 0, 0);
- wait (&status);
- }
-
- /* Kill the current process. */
- ptrace (PT_KILL, pid, 0, 0);
- ret = wait (&status);
-
- /* We might get a SIGCHLD instead of an exit status. This is
- aggravated by the first kill above - a child has just died. */
-
- while (ret == pid && WIFSTOPPED (status))
- {
- ptrace (PT_KILL, pid, 0, 0);
- ret = wait (&status);
- }
-
- target_mourn_inferior ();
+ if (!linux_supports_tracefork (pid))
+ error (_("Your system does not support exec catchpoints."));
}
/* On GNU/Linux there are no real LWP's. The closest thing to LWP's
because the "zombies" stay around. */
/* List of known LWPs. */
-static struct lwp_info *lwp_list;
+struct lwp_info *lwp_list;
/* Number of LWPs in the list. */
static int num_lwps;
-
-/* Non-zero if we're running in "threaded" mode. */
-static int threaded;
\f
-#define GET_LWP(ptid) ptid_get_lwp (ptid)
-#define GET_PID(ptid) ptid_get_pid (ptid)
-#define is_lwp(ptid) (GET_LWP (ptid) != 0)
-#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
-
/* If the last reported event was a SIGTRAP, this variable is set to
the process id of the LWP/thread that got it. */
ptid_t trap_ptid;
\f
-/* This module's target-specific operations. */
-static struct target_ops linux_nat_ops;
-
/* Since we cannot wait (in linux_nat_wait) for the initial process and
any cloned processes with a single call to waitpid, we have to use
the WNOHANG flag and call waitpid in a loop. To optimize
_initialize_linux_nat. */
static sigset_t suspend_mask;
-/* Signals to block to make that sigsuspend work. */
-static sigset_t blocked_mask;
+/* SIGCHLD action for synchronous mode. */
+struct sigaction sync_sigchld_action;
+
+/* SIGCHLD action for asynchronous mode. */
+static struct sigaction async_sigchld_action;
\f
/* Prototypes for local functions. */
static int stop_wait_callback (struct lwp_info *lp, void *data);
static int linux_nat_thread_alive (ptid_t ptid);
+static char *linux_child_pid_to_exec_file (int pid);
+static int cancel_breakpoint (struct lwp_info *lp);
+
\f
/* Convert wait status STATUS to a string. Used for printing debug
messages only. */
lwp_list = NULL;
num_lwps = 0;
- threaded = 0;
}
-/* Add the LWP specified by PID to the list. If this causes the
- number of LWPs to become larger than one, go into "threaded" mode.
- Return a pointer to the structure describing the new LWP. */
+/* Add the LWP specified by PID to the list. Return a pointer to the
+ structure describing the new LWP. The LWP should already be stopped
+ (with an exception for the very first LWP). */
static struct lwp_info *
add_lwp (ptid_t ptid)
lp->next = lwp_list;
lwp_list = lp;
- if (++num_lwps > 1)
- threaded = 1;
+ ++num_lwps;
+
+ if (num_lwps > 1 && linux_nat_new_thread != NULL)
+ linux_nat_new_thread (ptid);
return lp;
}
if (!lp)
return;
- /* We don't go back to "non-threaded" mode if the number of threads
- becomes less than two. */
num_lwps--;
if (lpprev)
return NULL;
}
-/* Attach to the LWP specified by PID. If VERBOSE is non-zero, print
- a message telling the user that a new LWP has been added to the
- process. */
+/* Update our internal state when changing from one fork (checkpoint,
+ et cetera) to another indicated by NEW_PTID. We can only switch
+ single-threaded applications, so we only create one new LWP, and
+ the previous list is discarded. */
void
-lin_lwp_attach_lwp (ptid_t ptid, int verbose)
+linux_nat_switch_fork (ptid_t new_ptid)
{
- struct lwp_info *lp, *found_lp;
+ struct lwp_info *lp;
- gdb_assert (is_lwp (ptid));
+ init_lwp_list ();
+ lp = add_lwp (new_ptid);
+ lp->stopped = 1;
+}
- /* Make sure SIGCHLD is blocked. We don't want SIGCHLD events
- to interrupt either the ptrace() or waitpid() calls below. */
- if (!sigismember (&blocked_mask, SIGCHLD))
- {
- sigaddset (&blocked_mask, SIGCHLD);
- sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
- }
+/* Record a PTID for later deletion. */
- if (verbose)
- printf_filtered ("[New %s]\n", target_pid_to_str (ptid));
+struct saved_ptids
+{
+ ptid_t ptid;
+ struct saved_ptids *next;
+};
+static struct saved_ptids *threads_to_delete;
- found_lp = lp = find_lwp_pid (ptid);
- if (lp == NULL)
- lp = add_lwp (ptid);
+static void
+record_dead_thread (ptid_t ptid)
+{
+ struct saved_ptids *p = xmalloc (sizeof (struct saved_ptids));
+ p->ptid = ptid;
+ p->next = threads_to_delete;
+ threads_to_delete = p;
+}
- /* We assume that we're already attached to any LWP that has an id
- equal to the overall process id, and to any LWP that is already
- in our list of LWPs. If we're not seeing exit events from threads
- and we've had PID wraparound since we last tried to stop all threads,
- this assumption might be wrong; fortunately, this is very unlikely
- to happen. */
- if (GET_LWP (ptid) != GET_PID (ptid) && found_lp == NULL)
- {
- pid_t pid;
- int status;
+/* Delete any dead threads which are not the current thread. */
- if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
- error ("Can't attach %s: %s", target_pid_to_str (ptid),
- safe_strerror (errno));
+static void
+prune_lwps (void)
+{
+ struct saved_ptids **p = &threads_to_delete;
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
- target_pid_to_str (ptid));
+ while (*p)
+ if (! ptid_equal ((*p)->ptid, inferior_ptid))
+ {
+ struct saved_ptids *tmp = *p;
+ delete_thread (tmp->ptid);
+ *p = tmp->next;
+ xfree (tmp);
+ }
+ else
+ p = &(*p)->next;
+}
- pid = waitpid (GET_LWP (ptid), &status, 0);
- if (pid == -1 && errno == ECHILD)
- {
+/* Handle the exit of a single thread LP. */
+
+static void
+exit_lwp (struct lwp_info *lp)
+{
+ if (in_thread_list (lp->ptid))
+ {
+ if (print_thread_events)
+ printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid));
+
+ /* Core GDB cannot deal with us deleting the current thread. */
+ if (!ptid_equal (lp->ptid, inferior_ptid))
+ delete_thread (lp->ptid);
+ else
+ record_dead_thread (lp->ptid);
+ }
+
+ delete_lwp (lp->ptid);
+}
+
+/* Attach to the LWP specified by PID. If VERBOSE is non-zero, print
+ a message telling the user that a new LWP has been added to the
+ process. Return 0 if successful or -1 if the new LWP could not
+ be attached. */
+
+int
+lin_lwp_attach_lwp (ptid_t ptid)
+{
+ struct lwp_info *lp;
+ int async_events_were_enabled = 0;
+
+ gdb_assert (is_lwp (ptid));
+
+ if (target_can_async_p ())
+ async_events_were_enabled = linux_nat_async_events (0);
+
+ lp = find_lwp_pid (ptid);
+
+ /* We assume that we're already attached to any LWP that has an id
+ equal to the overall process id, and to any LWP that is already
+ in our list of LWPs. If we're not seeing exit events from threads
+ and we've had PID wraparound since we last tried to stop all threads,
+ this assumption might be wrong; fortunately, this is very unlikely
+ to happen. */
+ if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL)
+ {
+ pid_t pid;
+ int status;
+ int cloned = 0;
+
+ if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
+ {
+ /* If we fail to attach to the thread, issue a warning,
+ but continue. One way this can happen is if thread
+ creation is interrupted; as of Linux kernel 2.6.19, a
+ bug may place threads in the thread list and then fail
+ to create them. */
+ warning (_("Can't attach %s: %s"), target_pid_to_str (ptid),
+ safe_strerror (errno));
+ return -1;
+ }
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
+ target_pid_to_str (ptid));
+
+ pid = my_waitpid (GET_LWP (ptid), &status, 0);
+ if (pid == -1 && errno == ECHILD)
+ {
/* Try again with __WCLONE to check cloned processes. */
- pid = waitpid (GET_LWP (ptid), &status, __WCLONE);
- lp->cloned = 1;
+ pid = my_waitpid (GET_LWP (ptid), &status, __WCLONE);
+ cloned = 1;
}
gdb_assert (pid == GET_LWP (ptid)
&& WIFSTOPPED (status) && WSTOPSIG (status));
- child_post_attach (pid);
+ if (lp == NULL)
+ lp = add_lwp (ptid);
+ lp->cloned = cloned;
+
+ target_post_attach (pid);
lp->stopped = 1;
{
/* We assume that the LWP representing the original process is
already stopped. Mark it as stopped in the data structure
- that the linux ptrace layer uses to keep track of threads.
- Note that this won't have already been done since the main
- thread will have, we assume, been stopped by an attach from a
- different layer. */
+ that the GNU/linux ptrace layer uses to keep track of
+ threads. Note that this won't have already been done since
+ the main thread will have, we assume, been stopped by an
+ attach from a different layer. */
+ if (lp == NULL)
+ lp = add_lwp (ptid);
lp->stopped = 1;
}
+
+ if (async_events_were_enabled)
+ linux_nat_async_events (1);
+
+ return 0;
+}
+
+static void
+linux_nat_create_inferior (char *exec_file, char *allargs, char **env,
+ int from_tty)
+{
+ int saved_async = 0;
+
+ /* The fork_child mechanism is synchronous and calls target_wait, so
+ we have to mask the async mode. */
+
+ if (target_can_async_p ())
+ saved_async = linux_nat_async_mask (0);
+ else
+ {
+ /* Restore the original signal mask. */
+ sigprocmask (SIG_SETMASK, &normal_mask, NULL);
+ /* Make sure we don't block SIGCHLD during a sigsuspend. */
+ suspend_mask = normal_mask;
+ sigdelset (&suspend_mask, SIGCHLD);
+ }
+
+ linux_ops->to_create_inferior (exec_file, allargs, env, from_tty);
+
+ if (saved_async)
+ linux_nat_async_mask (saved_async);
}
static void
struct lwp_info *lp;
pid_t pid;
int status;
+ int cloned = 0;
+ int options = 0;
/* FIXME: We should probably accept a list of process id's, and
attach all of them. */
- deprecated_child_ops.to_attach (args, from_tty);
+ linux_ops->to_attach (args, from_tty);
- /* Add the initial process as the first LWP to the list. */
- lp = add_lwp (BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)));
+ if (!target_can_async_p ())
+ {
+ /* Restore the original signal mask. */
+ sigprocmask (SIG_SETMASK, &normal_mask, NULL);
+ /* Make sure we don't block SIGCHLD during a sigsuspend. */
+ suspend_mask = normal_mask;
+ sigdelset (&suspend_mask, SIGCHLD);
+ }
/* Make sure the initial process is stopped. The user-level threads
layer might want to poke around in the inferior, and that won't
work if things haven't stabilized yet. */
- pid = waitpid (GET_PID (inferior_ptid), &status, 0);
+ pid = my_waitpid (GET_PID (inferior_ptid), &status, options);
if (pid == -1 && errno == ECHILD)
{
- warning ("%s is a cloned process", target_pid_to_str (inferior_ptid));
+ warning (_("%s is a cloned process"), target_pid_to_str (inferior_ptid));
/* Try again with __WCLONE to check cloned processes. */
- pid = waitpid (GET_PID (inferior_ptid), &status, __WCLONE);
- lp->cloned = 1;
+ options = __WCLONE;
+ pid = my_waitpid (GET_PID (inferior_ptid), &status, options);
+ cloned = 1;
}
gdb_assert (pid == GET_PID (inferior_ptid)
&& WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP);
- lp->stopped = 1;
+ /* Add the initial process as the first LWP to the list. */
+ inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid));
+ lp = add_lwp (inferior_ptid);
+ lp->cloned = cloned;
+
+ /* If this process is not using thread_db, then we still don't
+ detect any other threads, but add at least this one. */
+ add_thread_silent (lp->ptid);
- /* Fake the SIGSTOP that core GDB expects. */
- lp->status = W_STOPCODE (SIGSTOP);
+ lp->stopped = 1;
lp->resumed = 1;
- if (debug_linux_nat)
+
+ if (!target_can_async_p ())
+ {
+ /* Fake the SIGSTOP that core GDB expects. */
+ lp->status = W_STOPCODE (SIGSTOP);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LNA: waitpid %ld, faking SIGSTOP\n", (long) pid);
+ }
+ else
{
- fprintf_unfiltered (gdb_stdlog,
- "LLA: waitpid %ld, faking SIGSTOP\n", (long) pid);
+ /* We already waited for this LWP, so put the wait result on the
+ pipe. The event loop will wake up and gets us to handling
+ this event. */
+ linux_nat_event_pipe_push (pid, status, options);
+ /* Register in the event loop. */
+ target_async (inferior_event_handler, 0);
}
}
errno = 0;
if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0,
WSTOPSIG (lp->status)) < 0)
- error ("Can't continue %s: %s", target_pid_to_str (lp->ptid),
+ error (_("Can't continue %s: %s"), target_pid_to_str (lp->ptid),
safe_strerror (errno));
if (debug_linux_nat)
errno = 0;
if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
WSTOPSIG (lp->status)) < 0)
- error ("Can't detach %s: %s", target_pid_to_str (lp->ptid),
+ error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid),
safe_strerror (errno));
if (debug_linux_nat)
target_pid_to_str (lp->ptid),
strsignal (WSTOPSIG (lp->status)));
+ drain_queued_events (GET_LWP (lp->ptid));
delete_lwp (lp->ptid);
}
static void
linux_nat_detach (char *args, int from_tty)
{
+ int pid;
+ if (target_can_async_p ())
+ linux_nat_async (NULL, 0);
+
iterate_over_lwps (detach_callback, NULL);
/* Only the initial process should be left right now. */
/* Destroy LWP info; it's no longer valid. */
init_lwp_list ();
- /* Restore the original signal mask. */
- sigprocmask (SIG_SETMASK, &normal_mask, NULL);
- sigemptyset (&blocked_mask);
+ pid = GET_PID (inferior_ptid);
+ inferior_ptid = pid_to_ptid (pid);
+ linux_ops->to_detach (args, from_tty);
- inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
- deprecated_child_ops.to_detach (args, from_tty);
+ if (target_can_async_p ())
+ drain_queued_events (pid);
}
/* Resume LP. */
{
if (lp->stopped && lp->status == 0)
{
- struct thread_info *tp;
-
- child_resume (pid_to_ptid (GET_LWP (lp->ptid)), 0, TARGET_SIGNAL_0);
+ linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ 0, TARGET_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
target_pid_to_str (lp->ptid));
lp->stopped = 0;
lp->step = 0;
+ memset (&lp->siginfo, 0, sizeof (lp->siginfo));
}
return 0;
struct lwp_info *lp;
int resume_all;
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
+ step ? "step" : "resume",
+ target_pid_to_str (ptid),
+ signo ? strsignal (signo) : "0",
+ target_pid_to_str (inferior_ptid));
+
+ prune_lwps ();
+
+ if (target_can_async_p ())
+ /* Block events while we're here. */
+ linux_nat_async_events (0);
+
/* A specific PTID means `step only this process id'. */
resume_all = (PIDGET (ptid) == -1);
ptid = inferior_ptid;
lp = find_lwp_pid (ptid);
- if (lp)
- {
- ptid = pid_to_ptid (GET_LWP (lp->ptid));
+ gdb_assert (lp != NULL);
- /* Remember if we're stepping. */
- lp->step = step;
+ ptid = pid_to_ptid (GET_LWP (lp->ptid));
- /* Mark this LWP as resumed. */
- lp->resumed = 1;
+ /* Remember if we're stepping. */
+ lp->step = step;
- /* If we have a pending wait status for this thread, there is no
- point in resuming the process. */
- if (lp->status)
+ /* Mark this LWP as resumed. */
+ lp->resumed = 1;
+
+ /* If we have a pending wait status for this thread, there is no
+ point in resuming the process. But first make sure that
+ linux_nat_wait won't preemptively handle the event - we
+ should never take this short-circuit if we are going to
+ leave LP running, since we have skipped resuming all the
+ other threads. This bit of code needs to be synchronized
+ with linux_nat_wait. */
+
+ /* In async mode, we never have pending wait status. */
+ if (target_can_async_p () && lp->status)
+ internal_error (__FILE__, __LINE__, "Pending status in async mode");
+
+ if (lp->status && WIFSTOPPED (lp->status))
+ {
+ int saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
+
+ if (signal_stop_state (saved_signo) == 0
+ && signal_print_state (saved_signo) == 0
+ && signal_pass_state (saved_signo) == 1)
{
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLR: Not short circuiting for ignored "
+ "status 0x%x\n", lp->status);
+
/* FIXME: What should we do if we are supposed to continue
this thread with a signal? */
gdb_assert (signo == TARGET_SIGNAL_0);
- return;
+ signo = saved_signo;
+ lp->status = 0;
}
+ }
- /* Mark LWP as not stopped to prevent it from being continued by
- resume_callback. */
- lp->stopped = 0;
+ if (lp->status)
+ {
+ /* FIXME: What should we do if we are supposed to continue
+ this thread with a signal? */
+ gdb_assert (signo == TARGET_SIGNAL_0);
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLR: Short circuiting for status 0x%x\n",
+ lp->status);
+
+ return;
}
+ /* Mark LWP as not stopped to prevent it from being continued by
+ resume_callback. */
+ lp->stopped = 0;
+
if (resume_all)
iterate_over_lwps (resume_callback, NULL);
- child_resume (ptid, step, signo);
+ linux_ops->to_resume (ptid, step, signo);
+ memset (&lp->siginfo, 0, sizeof (lp->siginfo));
+
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLR: %s %s, %s (resume event thread)\n",
step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
target_pid_to_str (ptid),
signo ? strsignal (signo) : "0");
+
+ if (target_can_async_p ())
+ {
+ target_executing = 1;
+ target_async (inferior_event_handler, 0);
+ }
}
/* Issue kill to specified lwp. */
return kill (lwpid, signo);
}
-/* Handle a GNU/Linux extended wait response. Most of the work we
- just pass off to linux_handle_extended_wait, but if it reports a
- clone event we need to add the new LWP to our list (and not report
- the trap to higher layers). This function returns non-zero if
- the event should be ignored and we should wait again. */
+/* Handle a GNU/Linux extended wait response. If we see a clone
+ event, we need to add the new LWP to our list (and not report the
+ trap to higher layers). This function returns non-zero if the
+ event should be ignored and we should wait again. If STOPPING is
+ true, the new LWP remains stopped, otherwise it is continued. */
static int
-linux_nat_handle_extended (struct lwp_info *lp, int status)
+linux_handle_extended_wait (struct lwp_info *lp, int status,
+ int stopping)
{
- linux_handle_extended_wait (GET_LWP (lp->ptid), status,
- &lp->waitstatus);
+ int pid = GET_LWP (lp->ptid);
+ struct target_waitstatus *ourstatus = &lp->waitstatus;
+ struct lwp_info *new_lp = NULL;
+ int event = status >> 16;
- /* TARGET_WAITKIND_SPURIOUS is used to indicate clone events. */
- if (lp->waitstatus.kind == TARGET_WAITKIND_SPURIOUS)
+ if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK
+ || event == PTRACE_EVENT_CLONE)
{
- struct lwp_info *new_lp;
- new_lp = add_lwp (BUILD_LWP (lp->waitstatus.value.related_pid,
- GET_PID (inferior_ptid)));
- new_lp->cloned = 1;
- new_lp->stopped = 1;
+ unsigned long new_pid;
+ int ret;
- lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
+ ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid);
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLHE: Got clone event from LWP %ld, resuming\n",
- GET_LWP (lp->ptid));
- ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
+ /* If we haven't already seen the new PID stop, wait for it now. */
+ if (! pull_pid_from_list (&stopped_pids, new_pid, &status))
+ {
+ /* The new child has a pending SIGSTOP. We can't affect it until it
+ hits the SIGSTOP, but we're already attached. */
+ ret = my_waitpid (new_pid, &status,
+ (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0);
+ if (ret == -1)
+ perror_with_name (_("waiting for new child"));
+ else if (ret != new_pid)
+ internal_error (__FILE__, __LINE__,
+ _("wait returned unexpected PID %d"), ret);
+ else if (!WIFSTOPPED (status))
+ internal_error (__FILE__, __LINE__,
+ _("wait returned unexpected status 0x%x"), status);
+ }
- return 1;
+ ourstatus->value.related_pid = new_pid;
+
+ if (event == PTRACE_EVENT_FORK)
+ ourstatus->kind = TARGET_WAITKIND_FORKED;
+ else if (event == PTRACE_EVENT_VFORK)
+ ourstatus->kind = TARGET_WAITKIND_VFORKED;
+ else
+ {
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+ new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid)));
+ new_lp->cloned = 1;
+
+ if (WSTOPSIG (status) != SIGSTOP)
+ {
+ /* This can happen if someone starts sending signals to
+ the new thread before it gets a chance to run, which
+ have a lower number than SIGSTOP (e.g. SIGUSR1).
+ This is an unlikely case, and harder to handle for
+ fork / vfork than for clone, so we do not try - but
+ we handle it for clone events here. We'll send
+ the other signal on to the thread below. */
+
+ new_lp->signalled = 1;
+ }
+ else
+ status = 0;
+
+ if (stopping)
+ new_lp->stopped = 1;
+ else
+ {
+ new_lp->resumed = 1;
+ ptrace (PTRACE_CONT, lp->waitstatus.value.related_pid, 0,
+ status ? WSTOPSIG (status) : 0);
+ }
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHEW: Got clone event from LWP %ld, resuming\n",
+ GET_LWP (lp->ptid));
+ ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
+
+ return 1;
+ }
+
+ return 0;
}
- return 0;
+ if (event == PTRACE_EVENT_EXEC)
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXECD;
+ ourstatus->value.execd_pathname
+ = xstrdup (linux_child_pid_to_exec_file (pid));
+
+ if (linux_parent_pid)
+ {
+ detach_breakpoints (linux_parent_pid);
+ ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0);
+
+ linux_parent_pid = 0;
+ }
+
+ return 0;
+ }
+
+ internal_error (__FILE__, __LINE__,
+ _("unknown ptrace event %d"), event);
}
/* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
gdb_assert (!lp->stopped);
gdb_assert (lp->status == 0);
- pid = waitpid (GET_LWP (lp->ptid), &status, 0);
+ pid = my_waitpid (GET_LWP (lp->ptid), &status, 0);
if (pid == -1 && errno == ECHILD)
{
- pid = waitpid (GET_LWP (lp->ptid), &status, __WCLONE);
+ pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE);
if (pid == -1 && errno == ECHILD)
{
/* The thread has previously exited. We need to delete it
if (thread_dead)
{
- if (in_thread_list (lp->ptid))
- {
- /* Core GDB cannot deal with us deleting the current thread. */
- if (!ptid_equal (lp->ptid, inferior_ptid))
- delete_thread (lp->ptid);
- printf_unfiltered ("[%s exited]\n",
- target_pid_to_str (lp->ptid));
- }
-
- delete_lwp (lp->ptid);
+ exit_lwp (lp);
return 0;
}
fprintf_unfiltered (gdb_stdlog,
"WL: Handling extended status 0x%06x\n",
status);
- if (linux_nat_handle_extended (lp, status))
+ if (linux_handle_extended_wait (lp, status, 1))
return wait_lwp (lp);
}
return status;
}
+/* Save the most recent siginfo for LP. This is currently only called
+ for SIGTRAP; some ports use the si_addr field for
+ target_stopped_data_address. In the future, it may also be used to
+ restore the siginfo of requeued signals. */
+
+static void
+save_siginfo (struct lwp_info *lp)
+{
+ errno = 0;
+ ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid),
+ (PTRACE_TYPE_ARG3) 0, &lp->siginfo);
+
+ if (errno != 0)
+ memset (&lp->siginfo, 0, sizeof (lp->siginfo));
+}
+
/* Send a SIGSTOP to LP. */
static int
user will delete or disable the breakpoint, but the
thread will have already tripped on it. */
+ /* Save the trap's siginfo in case we need it later. */
+ save_siginfo (lp);
+
/* Now resume this LWP and get the SIGSTOP event. */
errno = 0;
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
"SWC: Candidate SIGTRAP event in %s\n",
target_pid_to_str (lp->ptid));
}
- /* Hold the SIGTRAP for handling by linux_nat_wait. */
+ /* Hold this event/waitstatus while we check to see if
+ there are any more (we still want to get that SIGSTOP). */
stop_wait_callback (lp, data);
- /* If there's another event, throw it back into the queue. */
- if (lp->status)
+
+ if (target_can_async_p ())
{
- if (debug_linux_nat)
+ /* Don't leave a pending wait status in async mode.
+ Retrigger the breakpoint. */
+ if (!cancel_breakpoint (lp))
{
- fprintf_unfiltered (gdb_stdlog,
- "SWC: kill %s, %s\n",
- target_pid_to_str (lp->ptid),
- status_to_str ((int) status));
+ /* There was no gdb breakpoint set at pc. Put
+ the event back in the queue. */
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SWC: kill %s, %s\n",
+ target_pid_to_str (lp->ptid),
+ status_to_str ((int) status));
+ kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status));
+ }
+ }
+ else
+ {
+ /* Hold the SIGTRAP for handling by
+ linux_nat_wait. */
+ /* If there's another event, throw it back into the
+ queue. */
+ if (lp->status)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SWC: kill %s, %s\n",
+ target_pid_to_str (lp->ptid),
+ status_to_str ((int) status));
+ kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
}
- kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
+ /* Save the sigtrap event. */
+ lp->status = status;
}
- /* Save the sigtrap event. */
- lp->status = status;
return 0;
}
else
/* Hold this event/waitstatus while we check to see if
there are any more (we still want to get that SIGSTOP). */
stop_wait_callback (lp, data);
- /* If the lp->status field is still empty, use it to hold
- this event. If not, then this event must be returned
- to the event queue of the LWP. */
- if (lp->status == 0)
- lp->status = status;
- else
+
+ /* If the lp->status field is still empty, use it to
+ hold this event. If not, then this event must be
+ returned to the event queue of the LWP. */
+ if (lp->status || target_can_async_p ())
{
if (debug_linux_nat)
{
}
kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status));
}
+ else
+ lp->status = status;
return 0;
}
}
if (lp->status)
{
if (debug_linux_nat)
- printf_unfiltered ("FC: LP has pending status %06x\n", lp->status);
+ printf_unfiltered (_("FC: LP has pending status %06x\n"), lp->status);
if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status)))
lp->status = 0;
}
- while (linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask))
+ /* While there is a pending signal we would like to flush, continue
+ the inferior and collect another signal. But if there's already
+ a saved status that we don't want to flush, we can't resume the
+ inferior - if it stopped for some other reason we wouldn't have
+ anywhere to save the new status. In that case, we must leave the
+ signal unflushed (and possibly generate an extra SIGINT stop).
+ That's much less bad than losing a signal. */
+ while (lp->status == 0
+ && linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask))
{
int ret;
return 0;
}
+static int
+cancel_breakpoint (struct lwp_info *lp)
+{
+ /* Arrange for a breakpoint to be hit again later. We don't keep
+ the SIGTRAP status and don't forward the SIGTRAP signal to the
+ LWP. We will handle the current event, eventually we will resume
+ this LWP, and this breakpoint will trap again.
+
+ If we do not do this, then we run the risk that the user will
+ delete or disable the breakpoint, but the LWP will have already
+ tripped on it. */
+
+ if (breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
+ gdbarch_decr_pc_after_break
+ (current_gdbarch)))
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "CB: Push back breakpoint for %s\n",
+ target_pid_to_str (lp->ptid));
+
+ /* Back up the PC if necessary. */
+ if (gdbarch_decr_pc_after_break (current_gdbarch))
+ write_pc_pid (read_pc_pid (lp->ptid) - gdbarch_decr_pc_after_break
+ (current_gdbarch),
+ lp->ptid);
+ return 1;
+ }
+ return 0;
+}
+
static int
cancel_breakpoints_callback (struct lwp_info *lp, void *data)
{
if (lp->status != 0
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
- && breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
- DECR_PC_AFTER_BREAK))
- {
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "CBC: Push back breakpoint for %s\n",
- target_pid_to_str (lp->ptid));
-
- /* Back up the PC if necessary. */
- if (DECR_PC_AFTER_BREAK)
- write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid);
-
- /* Throw away the SIGTRAP. */
- lp->status = 0;
- }
+ && cancel_breakpoint (lp))
+ /* Throw away the SIGTRAP. */
+ lp->status = 0;
return 0;
}
int random_selector;
struct lwp_info *event_lp;
- /* Record the wait status for the origional LWP. */
+ /* Record the wait status for the original LWP. */
(*orig_lp)->status = *status;
/* Give preference to any LWP that is being single-stepped. */
return lp->resumed;
}
-#ifdef CHILD_WAIT
+/* Stop an active thread, verify it still exists, then resume it. */
-/* We need to override child_wait to support attaching to cloned
- processes, since a normal wait (as done by the default version)
- ignores those processes. */
+static int
+stop_and_resume_callback (struct lwp_info *lp, void *data)
+{
+ struct lwp_info *ptr;
-/* Wait for child PTID to do something. Return id of the child,
- minus_one_ptid in case of error; store status into *OURSTATUS. */
+ if (!lp->stopped && !lp->signalled)
+ {
+ stop_callback (lp, NULL);
+ stop_wait_callback (lp, NULL);
+ /* Resume if the lwp still exists. */
+ for (ptr = lwp_list; ptr; ptr = ptr->next)
+ if (lp == ptr)
+ {
+ resume_callback (lp, NULL);
+ resume_set_callback (lp, NULL);
+ }
+ }
+ return 0;
+}
-ptid_t
-child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
+/* Check if we should go on and pass this event to common code.
+ Return the affected lwp if we are, or NULL otherwise. */
+static struct lwp_info *
+linux_nat_filter_event (int lwpid, int status, int options)
{
- int save_errno;
- int status;
- pid_t pid;
+ struct lwp_info *lp;
- ourstatus->kind = TARGET_WAITKIND_IGNORE;
+ lp = find_lwp_pid (pid_to_ptid (lwpid));
- do
+ /* Check for stop events reported by a process we didn't already
+ know about - anything not already in our LWP list.
+
+ If we're expecting to receive stopped processes after
+ fork, vfork, and clone events, then we'll just add the
+ new one to our list and go back to waiting for the event
+ to be reported - the stopped process might be returned
+ from waitpid before or after the event is. */
+ if (WIFSTOPPED (status) && !lp)
{
- set_sigint_trap (); /* Causes SIGINT to be passed on to the
- attached process. */
- set_sigio_trap ();
+ linux_record_stopped_pid (lwpid, status);
+ return NULL;
+ }
- pid = waitpid (GET_PID (ptid), &status, 0);
- if (pid == -1 && errno == ECHILD)
- /* Try again with __WCLONE to check cloned processes. */
- pid = waitpid (GET_PID (ptid), &status, __WCLONE);
+ /* Make sure we don't report an event for the exit of an LWP not in
+ our list, i.e. not part of the current process. This can happen
+ if we detach from a program we original forked and then it
+ exits. */
+ if (!WIFSTOPPED (status) && !lp)
+ return NULL;
+
+ /* NOTE drow/2003-06-17: This code seems to be meant for debugging
+ CLONE_PTRACE processes which do not use the thread library -
+ otherwise we wouldn't find the new LWP this way. That doesn't
+ currently work, and the following code is currently unreachable
+ due to the two blocks above. If it's fixed some day, this code
+ should be broken out into a function so that we can also pick up
+ LWPs from the new interface. */
+ if (!lp)
+ {
+ lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
+ if (options & __WCLONE)
+ lp->cloned = 1;
- if (debug_linux_nat)
+ gdb_assert (WIFSTOPPED (status)
+ && WSTOPSIG (status) == SIGSTOP);
+ lp->signalled = 1;
+
+ if (!in_thread_list (inferior_ptid))
{
- fprintf_unfiltered (gdb_stdlog,
- "CW: waitpid %ld received %s\n",
- (long) pid, status_to_str (status));
+ inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
+ GET_PID (inferior_ptid));
+ add_thread (inferior_ptid);
}
- save_errno = errno;
+ add_thread (lp->ptid);
+ }
- /* Make sure we don't report an event for the exit of the
- original program, if we've detached from it. */
- if (pid != -1 && !WIFSTOPPED (status) && pid != GET_PID (inferior_ptid))
- {
- pid = -1;
- save_errno = EINTR;
- }
+ /* Save the trap's siginfo in case we need it later. */
+ if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
+ save_siginfo (lp);
- /* Check for stop events reported by a process we didn't already
- know about - in this case, anything other than inferior_ptid.
-
- If we're expecting to receive stopped processes after fork,
- vfork, and clone events, then we'll just add the new one to
- our list and go back to waiting for the event to be reported
- - the stopped process might be returned from waitpid before
- or after the event is. If we want to handle debugging of
- CLONE_PTRACE processes we need to do more here, i.e. switch
- to multi-threaded mode. */
- if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP
- && pid != GET_PID (inferior_ptid))
+ /* Handle GNU/Linux's extended waitstatus for trace events. */
+ if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: Handling extended status 0x%06x\n",
+ status);
+ if (linux_handle_extended_wait (lp, status, 0))
+ return NULL;
+ }
+
+ /* Check if the thread has exited. */
+ if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
+ {
+ /* If this is the main thread, we must stop all threads and
+ verify if they are still alive. This is because in the nptl
+ thread model, there is no signal issued for exiting LWPs
+ other than the main thread. We only get the main thread exit
+ signal once all child threads have already exited. If we
+ stop all the threads and use the stop_wait_callback to check
+ if they have exited we can determine whether this signal
+ should be ignored or whether it means the end of the debugged
+ application, regardless of which threading model is being
+ used. */
+ if (GET_PID (lp->ptid) == GET_LWP (lp->ptid))
{
- linux_record_stopped_pid (pid);
- pid = -1;
- save_errno = EINTR;
+ lp->stopped = 1;
+ iterate_over_lwps (stop_and_resume_callback, NULL);
}
- /* Handle GNU/Linux's extended waitstatus for trace events. */
- if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP
- && status >> 16 != 0)
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: %s exited.\n",
+ target_pid_to_str (lp->ptid));
+
+ exit_lwp (lp);
+
+ /* If there is at least one more LWP, then the exit signal was
+ not the end of the debugged application and should be
+ ignored. */
+ if (num_lwps > 0)
{
- linux_handle_extended_wait (pid, status, ourstatus);
+ /* Make sure there is at least one thread running. */
+ gdb_assert (iterate_over_lwps (running_callback, NULL));
- /* If we see a clone event, detach the child, and don't
- report the event. It would be nice to offer some way to
- switch into a non-thread-db based threaded mode at this
- point. */
- if (ourstatus->kind == TARGET_WAITKIND_SPURIOUS)
- {
- ptrace (PTRACE_DETACH, ourstatus->value.related_pid, 0, 0);
- ourstatus->kind = TARGET_WAITKIND_IGNORE;
- ptrace (PTRACE_CONT, pid, 0, 0);
- pid = -1;
- save_errno = EINTR;
- }
+ /* Discard the event. */
+ return NULL;
}
-
- clear_sigio_trap ();
- clear_sigint_trap ();
}
- while (pid == -1 && save_errno == EINTR);
- if (pid == -1)
+ /* Check if the current LWP has previously exited. In the nptl
+ thread model, LWPs other than the main thread do not issue
+ signals when they exit so we must check whenever the thread has
+ stopped. A similar check is made in stop_wait_callback(). */
+ if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid))
{
- warning ("Child process unexpectedly missing: %s",
- safe_strerror (errno));
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: %s exited.\n",
+ target_pid_to_str (lp->ptid));
- /* Claim it exited with unknown signal. */
- ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
- ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
- return minus_one_ptid;
+ exit_lwp (lp);
+
+ /* Make sure there is at least one thread running. */
+ gdb_assert (iterate_over_lwps (running_callback, NULL));
+
+ /* Discard the event. */
+ return NULL;
}
- if (ourstatus->kind == TARGET_WAITKIND_IGNORE)
- store_waitstatus (ourstatus, status);
+ /* Make sure we don't report a SIGSTOP that we sent ourselves in
+ an attempt to stop an LWP. */
+ if (lp->signalled
+ && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: Delayed SIGSTOP caught for %s.\n",
+ target_pid_to_str (lp->ptid));
- return pid_to_ptid (pid);
-}
+ /* This is a delayed SIGSTOP. */
+ lp->signalled = 0;
-#endif
+ registers_changed ();
-/* Stop an active thread, verify it still exists, then resume it. */
+ linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ lp->step, TARGET_SIGNAL_0);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
+ lp->step ?
+ "PTRACE_SINGLESTEP" : "PTRACE_CONT",
+ target_pid_to_str (lp->ptid));
-static int
-stop_and_resume_callback (struct lwp_info *lp, void *data)
+ lp->stopped = 0;
+ gdb_assert (lp->resumed);
+
+ /* Discard the event. */
+ return NULL;
+ }
+
+ /* An interesting event. */
+ gdb_assert (lp);
+ return lp;
+}
+
+/* Get the events stored in the pipe into the local queue, so they are
+ accessible to queued_waitpid. We need to do this, since it is not
+ always the case that the event at the head of the pipe is the event
+ we want. */
+
+static void
+pipe_to_local_event_queue (void)
{
- struct lwp_info *ptr;
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog,
+ "PTLEQ: linux_nat_num_queued_events(%d)\n",
+ linux_nat_num_queued_events);
+ while (linux_nat_num_queued_events)
+ {
+ int lwpid, status, options;
+ lwpid = linux_nat_event_pipe_pop (&status, &options);
+ gdb_assert (lwpid > 0);
+ push_waitpid (lwpid, status, options);
+ }
+}
- if (!lp->stopped && !lp->signalled)
+/* Get the unprocessed events stored in the local queue back into the
+ pipe, so the event loop realizes there's something else to
+ process. */
+
+static void
+local_event_queue_to_pipe (void)
+{
+ struct waitpid_result *w = waitpid_queue;
+ while (w)
{
- stop_callback (lp, NULL);
- stop_wait_callback (lp, NULL);
- /* Resume if the lwp still exists. */
- for (ptr = lwp_list; ptr; ptr = ptr->next)
- if (lp == ptr)
- {
- resume_callback (lp, NULL);
- resume_set_callback (lp, NULL);
- }
+ struct waitpid_result *next = w->next;
+ linux_nat_event_pipe_push (w->pid,
+ w->status,
+ w->options);
+ xfree (w);
+ w = next;
}
- return 0;
+ waitpid_queue = NULL;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog,
+ "LEQTP: linux_nat_num_queued_events(%d)\n",
+ linux_nat_num_queued_events);
}
static ptid_t
pid_t pid = PIDGET (ptid);
sigset_t flush_mask;
- sigemptyset (&flush_mask);
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "LLW: enter\n");
- /* Make sure SIGCHLD is blocked. */
- if (!sigismember (&blocked_mask, SIGCHLD))
+ /* The first time we get here after starting a new inferior, we may
+ not have added it to the LWP list yet - this is the earliest
+ moment at which we know its PID. */
+ if (num_lwps == 0)
{
- sigaddset (&blocked_mask, SIGCHLD);
- sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
+ gdb_assert (!is_lwp (inferior_ptid));
+
+ inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
+ GET_PID (inferior_ptid));
+ lp = add_lwp (inferior_ptid);
+ lp->resumed = 1;
+ /* Add the main thread to GDB's thread list. */
+ add_thread_silent (lp->ptid);
}
+ sigemptyset (&flush_mask);
+
+ if (target_can_async_p ())
+ /* Block events while we're here. */
+ target_async (NULL, 0);
+
retry:
- /* Make sure there is at least one LWP that has been resumed, at
- least if there are any LWPs at all. */
- gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL));
+ /* Make sure there is at least one LWP that has been resumed. */
+ gdb_assert (iterate_over_lwps (resumed_callback, NULL));
/* First check if there is a LWP with a wait status pending. */
if (pid == -1)
lp = iterate_over_lwps (status_callback, NULL);
if (lp)
{
+ if (target_can_async_p ())
+ internal_error (__FILE__, __LINE__,
+ "Found an LWP with a pending status in async mode.");
+
status = lp->status;
lp->status = 0;
target_pid_to_str (lp->ptid));
}
- /* But if we don't fine one, we'll have to wait, and check both
+ /* But if we don't find one, we'll have to wait, and check both
cloned and uncloned processes. We start with the cloned
processes. */
options = __WCLONE | WNOHANG;
/* Resume the thread. It should halt immediately returning the
pending SIGSTOP. */
registers_changed ();
- child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
- TARGET_SIGNAL_0);
+ linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ lp->step, TARGET_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
stop_wait_callback (lp, NULL);
}
- set_sigint_trap (); /* Causes SIGINT to be passed on to the
- attached process. */
- set_sigio_trap ();
+ if (!target_can_async_p ())
+ {
+ /* Causes SIGINT to be passed on to the attached process. */
+ set_sigint_trap ();
+ set_sigio_trap ();
+ }
while (status == 0)
{
pid_t lwpid;
- lwpid = waitpid (pid, &status, options);
+ if (target_can_async_p ())
+ /* In async mode, don't ever block. Only look at the locally
+ queued events. */
+ lwpid = queued_waitpid (pid, &status, options);
+ else
+ lwpid = my_waitpid (pid, &status, options);
+
if (lwpid > 0)
{
gdb_assert (pid == -1 || lwpid == pid);
(long) lwpid, status_to_str (status));
}
- lp = find_lwp_pid (pid_to_ptid (lwpid));
-
- /* Check for stop events reported by a process we didn't
- already know about - anything not already in our LWP
- list.
-
- If we're expecting to receive stopped processes after
- fork, vfork, and clone events, then we'll just add the
- new one to our list and go back to waiting for the event
- to be reported - the stopped process might be returned
- from waitpid before or after the event is. */
- if (WIFSTOPPED (status) && !lp)
- {
- linux_record_stopped_pid (lwpid);
- status = 0;
- continue;
- }
-
- /* Make sure we don't report an event for the exit of an LWP not in
- our list, i.e. not part of the current process. This can happen
- if we detach from a program we original forked and then it
- exits. */
- if (!WIFSTOPPED (status) && !lp)
- {
- status = 0;
- continue;
- }
-
- /* NOTE drow/2003-06-17: This code seems to be meant for debugging
- CLONE_PTRACE processes which do not use the thread library -
- otherwise we wouldn't find the new LWP this way. That doesn't
- currently work, and the following code is currently unreachable
- due to the two blocks above. If it's fixed some day, this code
- should be broken out into a function so that we can also pick up
- LWPs from the new interface. */
+ lp = linux_nat_filter_event (lwpid, status, options);
if (!lp)
{
- lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
- if (options & __WCLONE)
- lp->cloned = 1;
-
- if (threaded)
- {
- gdb_assert (WIFSTOPPED (status)
- && WSTOPSIG (status) == SIGSTOP);
- lp->signalled = 1;
-
- if (!in_thread_list (inferior_ptid))
- {
- inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
- GET_PID (inferior_ptid));
- add_thread (inferior_ptid);
- }
-
- add_thread (lp->ptid);
- printf_unfiltered ("[New %s]\n",
- target_pid_to_str (lp->ptid));
- }
- }
-
- /* Handle GNU/Linux's extended waitstatus for trace events. */
- if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
- {
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLW: Handling extended status 0x%06x\n",
- status);
- if (linux_nat_handle_extended (lp, status))
- {
- status = 0;
- continue;
- }
- }
-
- /* Check if the thread has exited. */
- if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
- {
- if (in_thread_list (lp->ptid))
- {
- /* Core GDB cannot deal with us deleting the current
- thread. */
- if (!ptid_equal (lp->ptid, inferior_ptid))
- delete_thread (lp->ptid);
- printf_unfiltered ("[%s exited]\n",
- target_pid_to_str (lp->ptid));
- }
-
- /* If this is the main thread, we must stop all threads and
- verify if they are still alive. This is because in the nptl
- thread model, there is no signal issued for exiting LWPs
- other than the main thread. We only get the main thread
- exit signal once all child threads have already exited.
- If we stop all the threads and use the stop_wait_callback
- to check if they have exited we can determine whether this
- signal should be ignored or whether it means the end of the
- debugged application, regardless of which threading model
- is being used. */
- if (GET_PID (lp->ptid) == GET_LWP (lp->ptid))
- {
- lp->stopped = 1;
- iterate_over_lwps (stop_and_resume_callback, NULL);
- }
-
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLW: %s exited.\n",
- target_pid_to_str (lp->ptid));
-
- delete_lwp (lp->ptid);
-
- /* If there is at least one more LWP, then the exit signal
- was not the end of the debugged application and should be
- ignored. */
- if (num_lwps > 0)
- {
- /* Make sure there is at least one thread running. */
- gdb_assert (iterate_over_lwps (running_callback, NULL));
-
- /* Discard the event. */
- status = 0;
- continue;
- }
- }
-
- /* Check if the current LWP has previously exited. In the nptl
- thread model, LWPs other than the main thread do not issue
- signals when they exit so we must check whenever the thread
- has stopped. A similar check is made in stop_wait_callback(). */
- if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid))
- {
- if (in_thread_list (lp->ptid))
- {
- /* Core GDB cannot deal with us deleting the current
- thread. */
- if (!ptid_equal (lp->ptid, inferior_ptid))
- delete_thread (lp->ptid);
- printf_unfiltered ("[%s exited]\n",
- target_pid_to_str (lp->ptid));
- }
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLW: %s exited.\n",
- target_pid_to_str (lp->ptid));
-
- delete_lwp (lp->ptid);
-
- /* Make sure there is at least one thread running. */
- gdb_assert (iterate_over_lwps (running_callback, NULL));
-
- /* Discard the event. */
- status = 0;
- continue;
- }
-
- /* Make sure we don't report a SIGSTOP that we sent
- ourselves in an attempt to stop an LWP. */
- if (lp->signalled
- && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP)
- {
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLW: Delayed SIGSTOP caught for %s.\n",
- target_pid_to_str (lp->ptid));
-
- /* This is a delayed SIGSTOP. */
- lp->signalled = 0;
-
- registers_changed ();
- child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
- TARGET_SIGNAL_0);
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
- lp->step ?
- "PTRACE_SINGLESTEP" : "PTRACE_CONT",
- target_pid_to_str (lp->ptid));
-
- lp->stopped = 0;
- gdb_assert (lp->resumed);
-
- /* Discard the event. */
+ /* A discarded event. */
status = 0;
continue;
}
/* Alternate between checking cloned and uncloned processes. */
options ^= __WCLONE;
- /* And suspend every time we have checked both. */
+ /* And every time we have checked both:
+ In async mode, return to event loop;
+ In sync mode, suspend waiting for a SIGCHLD signal. */
if (options & __WCLONE)
- sigsuspend (&suspend_mask);
+ {
+ if (target_can_async_p ())
+ {
+ /* No interesting event. */
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+
+ /* Get ready for the next event. */
+ target_async (inferior_event_handler, 0);
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n");
+
+ return minus_one_ptid;
+ }
+
+ sigsuspend (&suspend_mask);
+ }
}
/* We shouldn't end up here unless we want to try again. */
gdb_assert (status == 0);
}
- clear_sigio_trap ();
- clear_sigint_trap ();
+ if (!target_can_async_p ())
+ {
+ clear_sigio_trap ();
+ clear_sigint_trap ();
+ }
gdb_assert (lp);
{
int signo = target_signal_from_host (WSTOPSIG (status));
- if (signal_stop_state (signo) == 0
+ /* If we get a signal while single-stepping, we may need special
+ care, e.g. to skip the signal handler. Defer to common code. */
+ if (!lp->step
+ && signal_stop_state (signo) == 0
&& signal_print_state (signo) == 0
&& signal_pass_state (signo) == 1)
{
newly attached threads may cause an unwanted delay in
getting them running. */
registers_changed ();
- child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, signo);
+ linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ lp->step, signo);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLW: %s %s, %s (preempt 'handle')\n",
the comment in cancel_breakpoints_callback to find out why. */
iterate_over_lwps (cancel_breakpoints_callback, lp);
- /* If we're not running in "threaded" mode, we'll report the bare
- process id. */
-
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
{
- trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
+ trap_ptid = lp->ptid;
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLW: trap_ptid is %s.\n",
else
store_waitstatus (ourstatus, status);
- return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
+ /* Get ready for the next event. */
+ if (target_can_async_p ())
+ target_async (inferior_event_handler, 0);
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "LLW: exit\n");
+
+ return lp->ptid;
}
static int
{
do
{
- pid = waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
- if (pid != (pid_t) -1 && debug_linux_nat)
+ pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
+ if (pid != (pid_t) -1)
{
- fprintf_unfiltered (gdb_stdlog,
- "KWC: wait %s received unknown.\n",
- target_pid_to_str (lp->ptid));
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "KWC: wait %s received unknown.\n",
+ target_pid_to_str (lp->ptid));
+ /* The Linux kernel sometimes fails to kill a thread
+ completely after PTRACE_KILL; that goes from the stop
+ point in do_fork out to the one in
+ get_signal_to_deliever and waits again. So kill it
+ again. */
+ kill_callback (lp, NULL);
}
}
while (pid == GET_LWP (lp->ptid));
do
{
- pid = waitpid (GET_LWP (lp->ptid), NULL, 0);
- if (pid != (pid_t) -1 && debug_linux_nat)
+ pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0);
+ if (pid != (pid_t) -1)
{
- fprintf_unfiltered (gdb_stdlog,
- "KWC: wait %s received unk.\n",
- target_pid_to_str (lp->ptid));
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "KWC: wait %s received unk.\n",
+ target_pid_to_str (lp->ptid));
+ /* See the call to kill_callback above. */
+ kill_callback (lp, NULL);
}
}
while (pid == GET_LWP (lp->ptid));
static void
linux_nat_kill (void)
{
- /* Kill all LWP's ... */
- iterate_over_lwps (kill_callback, NULL);
+ struct target_waitstatus last;
+ ptid_t last_ptid;
+ int status;
- /* ... and wait until we've flushed all events. */
- iterate_over_lwps (kill_wait_callback, NULL);
+ if (target_can_async_p ())
+ target_async (NULL, 0);
- target_mourn_inferior ();
-}
+ /* If we're stopped while forking and we haven't followed yet,
+ kill the other task. We need to do this first because the
+ parent will be sleeping if this is a vfork. */
-static void
-linux_nat_create_inferior (char *exec_file, char *allargs, char **env,
- int from_tty)
-{
- deprecated_child_ops.to_create_inferior (exec_file, allargs, env, from_tty);
+ get_last_target_status (&last_ptid, &last);
+
+ if (last.kind == TARGET_WAITKIND_FORKED
+ || last.kind == TARGET_WAITKIND_VFORKED)
+ {
+ ptrace (PT_KILL, last.value.related_pid, 0, 0);
+ wait (&status);
+ }
+
+ if (forks_exist_p ())
+ {
+ linux_fork_killall ();
+ drain_queued_events (-1);
+ }
+ else
+ {
+ /* Kill all LWP's ... */
+ iterate_over_lwps (kill_callback, NULL);
+
+ /* ... and wait until we've flushed all events. */
+ iterate_over_lwps (kill_wait_callback, NULL);
+ }
+
+ target_mourn_inferior ();
}
static void
/* Destroy LWP info; it's no longer valid. */
init_lwp_list ();
- /* Restore the original signal mask. */
- sigprocmask (SIG_SETMASK, &normal_mask, NULL);
- sigemptyset (&blocked_mask);
-
- deprecated_child_ops.to_mourn_inferior ();
+ if (! forks_exist_p ())
+ {
+ /* Normal case, no other forks available. */
+ if (target_can_async_p ())
+ linux_nat_async (NULL, 0);
+ linux_ops->to_mourn_inferior ();
+ }
+ else
+ /* Multi-fork case. The current inferior_ptid has exited, but
+ there are other viable forks to debug. Delete the exiting
+ one and context-switch to the first available. */
+ linux_fork_mourn_inferior ();
}
-static int
-linux_nat_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
- struct mem_attrib *attrib, struct target_ops *target)
+static LONGEST
+linux_nat_xfer_partial (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, LONGEST len)
{
struct cleanup *old_chain = save_inferior_ptid ();
- int xfer;
+ LONGEST xfer;
if (is_lwp (inferior_ptid))
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
- xfer = linux_proc_xfer_memory (memaddr, myaddr, len, write, attrib, target);
- if (xfer == 0)
- xfer = child_xfer_memory (memaddr, myaddr, len, write, attrib, target);
+ xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf,
+ offset, len);
do_cleanups (old_chain);
return xfer;
"LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n",
target_pid_to_str (ptid),
errno ? safe_strerror (errno) : "OK");
- if (errno)
+
+ /* Not every Linux kernel implements PTRACE_PEEKUSER. But we can
+ handle that case gracefully since ptrace will first do a lookup
+ for the process based upon the passed-in pid. If that fails we
+ will get either -ESRCH or -EPERM, otherwise the child exists and
+ is alive. */
+ if (errno == ESRCH || errno == EPERM)
return 0;
return 1;
{
static char buf[64];
- if (is_lwp (ptid))
+ if (lwp_list && lwp_list->next && is_lwp (ptid))
{
snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
return buf;
return normal_pid_to_str (ptid);
}
-static void
-init_linux_nat_ops (void)
-{
-#if 0
- linux_nat_ops.to_open = linux_nat_open;
-#endif
- linux_nat_ops.to_shortname = "lwp-layer";
- linux_nat_ops.to_longname = "lwp-layer";
- linux_nat_ops.to_doc = "Low level threads support (LWP layer)";
- linux_nat_ops.to_attach = linux_nat_attach;
- linux_nat_ops.to_detach = linux_nat_detach;
- linux_nat_ops.to_resume = linux_nat_resume;
- linux_nat_ops.to_wait = linux_nat_wait;
- /* fetch_inferior_registers and store_inferior_registers will
- honor the LWP id, so we can use them directly. */
- linux_nat_ops.to_fetch_registers = fetch_inferior_registers;
- linux_nat_ops.to_store_registers = store_inferior_registers;
- linux_nat_ops.deprecated_xfer_memory = linux_nat_xfer_memory;
- linux_nat_ops.to_kill = linux_nat_kill;
- linux_nat_ops.to_create_inferior = linux_nat_create_inferior;
- linux_nat_ops.to_mourn_inferior = linux_nat_mourn_inferior;
- linux_nat_ops.to_thread_alive = linux_nat_thread_alive;
- linux_nat_ops.to_pid_to_str = linux_nat_pid_to_str;
- linux_nat_ops.to_post_startup_inferior = child_post_startup_inferior;
- linux_nat_ops.to_post_attach = child_post_attach;
- linux_nat_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint;
- linux_nat_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint;
- linux_nat_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint;
-
- linux_nat_ops.to_stratum = thread_stratum;
- linux_nat_ops.to_has_thread_control = tc_schedlock;
- linux_nat_ops.to_magic = OPS_MAGIC;
-}
-
static void
sigchld_handler (int signo)
{
+ if (linux_nat_async_enabled
+ && linux_nat_async_events_enabled
+ && signo == SIGCHLD)
+ /* It is *always* a bug to hit this. */
+ internal_error (__FILE__, __LINE__,
+ "sigchld_handler called when async events are enabled");
+
/* Do nothing. The only reason for this handler is that it allows
us to use sigsuspend in linux_nat_wait above to wait for the
arrival of a SIGCHLD. */
/* Accepts an integer PID; Returns a string representing a file that
can be opened to get the symbols for the child process. */
-char *
-child_pid_to_exec_file (int pid)
+static char *
+linux_child_pid_to_exec_file (int pid)
{
char *name1, *name2;
int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx",
addr, endaddr, permissions, offset, device, inode);
- if (ret > 0 && ret != EOF && *inode != 0)
+ filename[0] = '\0';
+ if (ret > 0 && ret != EOF)
{
/* Eat everything up to EOL for the filename. This will prevent
weird filenames (such as one with embedded whitespace) from
Note the filename is used for informational purposes
only. */
- ret += fscanf (mapfile, "%[^\n]\n", filename);
- }
- else
- {
- filename[0] = '\0'; /* no filename */
- fscanf (mapfile, "\n");
+ ret += fscanf (mapfile, "%[^\n]\n", filename);
}
+
return (ret != 0 && ret != EOF);
}
/* Compose the filename for the /proc memory map, and open it. */
sprintf (mapsfilename, "/proc/%lld/maps", pid);
if ((mapsfile = fopen (mapsfilename, "r")) == NULL)
- error ("Could not open %s\n", mapsfilename);
+ error (_("Could not open %s."), mapsfilename);
if (info_verbose)
fprintf_filtered (gdb_stdout,
size, paddr_nz (addr),
read ? 'r' : ' ',
write ? 'w' : ' ', exec ? 'x' : ' ');
- if (filename && filename[0])
+ if (filename[0])
fprintf_filtered (gdb_stdout, " for %s", filename);
fprintf_filtered (gdb_stdout, "\n");
}
gdb_fpxregset_t fpxregs;
#endif
unsigned long lwp = ptid_get_lwp (ptid);
+ struct regcache *regcache = get_thread_regcache (ptid);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ const struct regset *regset;
+ int core_regset_p;
+ struct cleanup *old_chain;
+
+ old_chain = save_inferior_ptid ();
+ inferior_ptid = ptid;
+ target_fetch_registers (regcache, -1);
+ do_cleanups (old_chain);
+
+ core_regset_p = gdbarch_regset_from_core_section_p (gdbarch);
+ if (core_regset_p
+ && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg",
+ sizeof (gregs))) != NULL
+ && regset->collect_regset != NULL)
+ regset->collect_regset (regset, regcache, -1,
+ &gregs, sizeof (gregs));
+ else
+ fill_gregset (regcache, &gregs, -1);
- fill_gregset (&gregs, -1);
note_data = (char *) elfcore_write_prstatus (obfd,
note_data,
note_size,
lwp,
stop_signal, &gregs);
- fill_fpregset (&fpregs, -1);
+ if (core_regset_p
+ && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2",
+ sizeof (fpregs))) != NULL
+ && regset->collect_regset != NULL)
+ regset->collect_regset (regset, regcache, -1,
+ &fpregs, sizeof (fpregs));
+ else
+ fill_fpregset (regcache, &fpregs, -1);
+
note_data = (char *) elfcore_write_prfpreg (obfd,
note_data,
note_size,
&fpregs, sizeof (fpregs));
+
#ifdef FILL_FPXREGSET
- fill_fpxregset (&fpxregs, -1);
+ if (core_regset_p
+ && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg-xfp",
+ sizeof (fpxregs))) != NULL
+ && regset->collect_regset != NULL)
+ regset->collect_regset (regset, regcache, -1,
+ &fpxregs, sizeof (fpxregs));
+ else
+ fill_fpxregset (regcache, &fpxregs, -1);
+
note_data = (char *) elfcore_write_prxfpreg (obfd,
note_data,
note_size,
linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data)
{
struct linux_nat_corefile_thread_data *args = data;
- ptid_t saved_ptid = inferior_ptid;
- inferior_ptid = ti->ptid;
- registers_changed ();
- target_fetch_registers (-1); /* FIXME should not be necessary;
- fill_gregset should do it automatically. */
args->note_data = linux_nat_do_thread_registers (args->obfd,
ti->ptid,
args->note_data,
args->note_size);
args->num_notes++;
- inferior_ptid = saved_ptid;
- registers_changed ();
- target_fetch_registers (-1); /* FIXME should not be necessary;
- fill_gregset should do it automatically. */
+
return 0;
}
linux_nat_do_registers (bfd *obfd, ptid_t ptid,
char *note_data, int *note_size)
{
- registers_changed ();
- target_fetch_registers (-1); /* FIXME should not be necessary;
- fill_gregset should do it automatically. */
return linux_nat_do_thread_registers (obfd,
ptid_build (ptid_get_pid (inferior_ptid),
ptid_get_pid (inferior_ptid),
0),
note_data, note_size);
- return note_data;
}
/* Fills the "to_make_corefile_note" target vector. Builds the note
{
struct linux_nat_corefile_thread_data thread_args;
struct cleanup *old_chain;
+ /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
char fname[16] = { '\0' };
+ /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
char psargs[80] = { '\0' };
char *note_data = NULL;
ptid_t current_ptid = inferior_ptid;
- char *auxv;
+ gdb_byte *auxv;
int auxv_len;
if (get_exec_file (0))
strncpy (psargs, get_exec_file (0), sizeof (psargs));
if (get_inferior_args ())
{
- strncat (psargs, " ", sizeof (psargs) - strlen (psargs));
- strncat (psargs, get_inferior_args (),
- sizeof (psargs) - strlen (psargs));
+ char *string_end;
+ char *psargs_end = psargs + sizeof (psargs);
+
+ /* linux_elfcore_write_prpsinfo () handles zero unterminated
+ strings fine. */
+ string_end = memchr (psargs, 0, sizeof (psargs));
+ if (string_end != NULL)
+ {
+ *string_end++ = ' ';
+ strncpy (string_end, get_inferior_args (),
+ psargs_end - string_end);
+ }
}
note_data = (char *) elfcore_write_prpsinfo (obfd,
note_data,
note_data = thread_args.note_data;
}
- auxv_len = target_auxv_read (¤t_target, &auxv);
+ auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV,
+ NULL, &auxv);
if (auxv_len > 0)
{
note_data = elfcore_write_note (obfd, note_data, note_size,
argv++;
}
if (pid == 0)
- error ("No current process: you must name one.");
+ error (_("No current process: you must name one."));
sprintf (fname1, "/proc/%lld", pid);
if (stat (fname1, &dummy) != 0)
- error ("No /proc directory: '%s'", fname1);
+ error (_("No /proc directory: '%s'"), fname1);
- printf_filtered ("process %lld\n", pid);
+ printf_filtered (_("process %lld\n"), pid);
if (cmdline_f || all)
{
sprintf (fname1, "/proc/%lld/cmdline", pid);
- if ((procfile = fopen (fname1, "r")) > 0)
+ if ((procfile = fopen (fname1, "r")) != NULL)
{
fgets (buffer, sizeof (buffer), procfile);
printf_filtered ("cmdline = '%s'\n", buffer);
fclose (procfile);
}
else
- warning ("unable to open /proc file '%s'", fname1);
+ warning (_("unable to open /proc file '%s'"), fname1);
}
if (cwd_f || all)
{
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
printf_filtered ("cwd = '%s'\n", fname2);
else
- warning ("unable to read link '%s'", fname1);
+ warning (_("unable to read link '%s'"), fname1);
}
if (exe_f || all)
{
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
printf_filtered ("exe = '%s'\n", fname2);
else
- warning ("unable to read link '%s'", fname1);
+ warning (_("unable to read link '%s'"), fname1);
}
if (mappings_f || all)
{
sprintf (fname1, "/proc/%lld/maps", pid);
- if ((procfile = fopen (fname1, "r")) > 0)
+ if ((procfile = fopen (fname1, "r")) != NULL)
{
long long addr, endaddr, size, offset, inode;
char permissions[8], device[8], filename[MAXPATHLEN];
- printf_filtered ("Mapped address spaces:\n\n");
- if (TARGET_ADDR_BIT == 32)
+ printf_filtered (_("Mapped address spaces:\n\n"));
+ if (gdbarch_addr_bit (current_gdbarch) == 32)
{
printf_filtered ("\t%10s %10s %10s %10s %7s\n",
"Start Addr",
a generic local_address_string instead to print out
the addresses; that makes sense to me, too. */
- if (TARGET_ADDR_BIT == 32)
+ if (gdbarch_addr_bit (current_gdbarch) == 32)
{
printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
(unsigned long) addr, /* FIXME: pr_addr */
fclose (procfile);
}
else
- warning ("unable to open /proc file '%s'", fname1);
+ warning (_("unable to open /proc file '%s'"), fname1);
}
if (status_f || all)
{
sprintf (fname1, "/proc/%lld/status", pid);
- if ((procfile = fopen (fname1, "r")) > 0)
+ if ((procfile = fopen (fname1, "r")) != NULL)
{
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
puts_filtered (buffer);
fclose (procfile);
}
else
- warning ("unable to open /proc file '%s'", fname1);
+ warning (_("unable to open /proc file '%s'"), fname1);
}
if (stat_f || all)
{
sprintf (fname1, "/proc/%lld/stat", pid);
- if ((procfile = fopen (fname1, "r")) > 0)
+ if ((procfile = fopen (fname1, "r")) != NULL)
{
int itmp;
char ctmp;
+ long ltmp;
if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Process: %d\n", itmp);
- if (fscanf (procfile, "%s ", &buffer[0]) > 0)
- printf_filtered ("Exec file: %s\n", buffer);
+ printf_filtered (_("Process: %d\n"), itmp);
+ if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0)
+ printf_filtered (_("Exec file: %s\n"), buffer);
if (fscanf (procfile, "%c ", &ctmp) > 0)
- printf_filtered ("State: %c\n", ctmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Parent process: %d\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Process group: %d\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Session id: %d\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("TTY: %d\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("TTY owner process group: %d\n", itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Flags: 0x%x\n", itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Minor faults (no memory page): %u\n",
- (unsigned int) itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Minor faults, children: %u\n",
- (unsigned int) itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Major faults (memory page faults): %u\n",
- (unsigned int) itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Major faults, children: %u\n",
- (unsigned int) itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("utime: %d\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("stime: %d\n", itmp);
+ printf_filtered (_("State: %c\n"), ctmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("utime, children: %d\n", itmp);
+ printf_filtered (_("Parent process: %d\n"), itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("stime, children: %d\n", itmp);
+ printf_filtered (_("Process group: %d\n"), itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("jiffies remaining in current time slice: %d\n",
- itmp);
+ printf_filtered (_("Session id: %d\n"), itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("'nice' value: %d\n", itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("jiffies until next timeout: %u\n",
- (unsigned int) itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("jiffies until next SIGALRM: %u\n",
- (unsigned int) itmp);
+ printf_filtered (_("TTY: %d\n"), itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("start time (jiffies since system boot): %d\n",
- itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Virtual memory size: %u\n",
- (unsigned int) itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Resident set size: %u\n", (unsigned int) itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("rlim: %u\n", (unsigned int) itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Start of text: 0x%x\n", itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("End of text: 0x%x\n", itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0)
- printf_filtered ("Start of stack: 0x%x\n", itmp);
+ printf_filtered (_("TTY owner process group: %d\n"), itmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Flags: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Minor faults (no memory page): %lu\n"),
+ (unsigned long) ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Minor faults, children: %lu\n"),
+ (unsigned long) ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Major faults (memory page faults): %lu\n"),
+ (unsigned long) ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Major faults, children: %lu\n"),
+ (unsigned long) ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("utime: %ld\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("stime: %ld\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("utime, children: %ld\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("stime, children: %ld\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("jiffies remaining in current time slice: %ld\n"),
+ ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("'nice' value: %ld\n"), ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("jiffies until next timeout: %lu\n"),
+ (unsigned long) ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
+ (unsigned long) ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("start time (jiffies since system boot): %ld\n"),
+ ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Virtual memory size: %lu\n"),
+ (unsigned long) ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Start of text: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("End of text: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0)
+ printf_filtered (_("Start of stack: 0x%lx\n"), ltmp);
#if 0 /* Don't know how architecture-dependent the rest is...
Anyway the signal bitmap info is available from "status". */
- if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */
- printf_filtered ("Kernel stack pointer: 0x%x\n", itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */
- printf_filtered ("Kernel instr pointer: 0x%x\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Pending signals bitmap: 0x%x\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Blocked signals bitmap: 0x%x\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Ignored signals bitmap: 0x%x\n", itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered ("Catched signals bitmap: 0x%x\n", itmp);
- if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */
- printf_filtered ("wchan (system call): 0x%x\n", itmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
+ printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
+ printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%ld ", <mp) > 0)
+ printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp);
+ if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
+ printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp);
#endif
fclose (procfile);
}
else
- warning ("unable to open /proc file '%s'", fname1);
+ warning (_("unable to open /proc file '%s'"), fname1);
}
}
-int
-linux_proc_xfer_memory (CORE_ADDR addr, char *myaddr, int len, int write,
- struct mem_attrib *attrib, struct target_ops *target)
+/* Implement the to_xfer_partial interface for memory reads using the /proc
+ filesystem. Because we can use a single read() call for /proc, this
+ can be much more efficient than banging away at PTRACE_PEEKTEXT,
+ but it doesn't support writes. */
+
+static LONGEST
+linux_proc_xfer_partial (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, LONGEST len)
{
- int fd, ret;
+ LONGEST ret;
+ int fd;
char filename[64];
- if (write)
+ if (object != TARGET_OBJECT_MEMORY || !readbuf)
return 0;
/* Don't bother for one word. */
32-bit platforms (for instance, SPARC debugging a SPARC64
application). */
#ifdef HAVE_PREAD64
- if (pread64 (fd, myaddr, len, addr) != len)
+ if (pread64 (fd, readbuf, len, offset) != len)
#else
- if (lseek (fd, addr, SEEK_SET) == -1 || read (fd, myaddr, len) != len)
+ if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len)
#endif
ret = 0;
else
int signum;
if (line[len] != '\n')
- error ("Could not parse signal set: %s", line);
+ error (_("Could not parse signal set: %s"), line);
p = line;
signum = len * 4;
else if (*p >= 'a' && *p <= 'f')
digit = *p - 'a' + 10;
else
- error ("Could not parse signal set: %s", line);
+ error (_("Could not parse signal set: %s"), line);
signum -= 4;
sprintf (fname, "/proc/%d/status", pid);
procfile = fopen (fname, "r");
if (procfile == NULL)
- error ("Could not open %s", fname);
+ error (_("Could not open %s"), fname);
while (fgets (buffer, MAXPATHLEN, procfile) != NULL)
{
fclose (procfile);
}
+static LONGEST
+linux_xfer_partial (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+{
+ LONGEST xfer;
+
+ if (object == TARGET_OBJECT_AUXV)
+ return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf,
+ offset, len);
+
+ xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf,
+ offset, len);
+ if (xfer != 0)
+ return xfer;
+
+ return super_xfer_partial (ops, object, annex, readbuf, writebuf,
+ offset, len);
+}
+
+/* Create a prototype generic GNU/Linux target. The client can override
+ it with local methods. */
+
+static void
+linux_target_install_ops (struct target_ops *t)
+{
+ t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint;
+ t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint;
+ t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint;
+ t->to_pid_to_exec_file = linux_child_pid_to_exec_file;
+ t->to_post_startup_inferior = linux_child_post_startup_inferior;
+ t->to_post_attach = linux_child_post_attach;
+ t->to_follow_fork = linux_child_follow_fork;
+ t->to_find_memory_regions = linux_nat_find_memory_regions;
+ t->to_make_corefile_notes = linux_nat_make_corefile_notes;
+
+ super_xfer_partial = t->to_xfer_partial;
+ t->to_xfer_partial = linux_xfer_partial;
+}
+
+struct target_ops *
+linux_target (void)
+{
+ struct target_ops *t;
+
+ t = inf_ptrace_target ();
+ linux_target_install_ops (t);
+
+ return t;
+}
+
+struct target_ops *
+linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int))
+{
+ struct target_ops *t;
+
+ t = inf_ptrace_trad_target (register_u_offset);
+ linux_target_install_ops (t);
+
+ return t;
+}
+
+/* Controls if async mode is permitted. */
+static int linux_async_permitted = 0;
+
+/* The set command writes to this variable. If the inferior is
+ executing, linux_nat_async_permitted is *not* updated. */
+static int linux_async_permitted_1 = 0;
+
+static void
+set_maintenance_linux_async_permitted (char *args, int from_tty,
+ struct cmd_list_element *c)
+{
+ if (target_has_execution)
+ {
+ linux_async_permitted_1 = linux_async_permitted;
+ error (_("Cannot change this setting while the inferior is running."));
+ }
+
+ linux_async_permitted = linux_async_permitted_1;
+ linux_nat_set_async_mode (linux_async_permitted);
+}
+
+static void
+show_maintenance_linux_async_permitted (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("\
+Controlling the GNU/Linux inferior in asynchronous mode is %s.\n"),
+ value);
+}
+
+/* target_is_async_p implementation. */
+
+static int
+linux_nat_is_async_p (void)
+{
+ /* NOTE: palves 2008-03-21: We're only async when the user requests
+ it explicitly with the "maintenance set linux-async" command.
+ Someday, linux will always be async. */
+ if (!linux_async_permitted)
+ return 0;
+
+ return 1;
+}
+
+/* target_can_async_p implementation. */
+
+static int
+linux_nat_can_async_p (void)
+{
+ /* NOTE: palves 2008-03-21: We're only async when the user requests
+ it explicitly with the "maintenance set linux-async" command.
+ Someday, linux will always be async. */
+ if (!linux_async_permitted)
+ return 0;
+
+ /* See target.h/target_async_mask. */
+ return linux_nat_async_mask_value;
+}
+
+/* target_async_mask implementation. */
+
+static int
+linux_nat_async_mask (int mask)
+{
+ int current_state;
+ current_state = linux_nat_async_mask_value;
+
+ if (current_state != mask)
+ {
+ if (mask == 0)
+ {
+ linux_nat_async (NULL, 0);
+ linux_nat_async_mask_value = mask;
+ /* We're in sync mode. Make sure SIGCHLD isn't handled by
+ async_sigchld_handler when we come out of sigsuspend in
+ linux_nat_wait. */
+ sigaction (SIGCHLD, &sync_sigchld_action, NULL);
+ }
+ else
+ {
+ /* Restore the async handler. */
+ sigaction (SIGCHLD, &async_sigchld_action, NULL);
+ linux_nat_async_mask_value = mask;
+ linux_nat_async (inferior_event_handler, 0);
+ }
+ }
+
+ return current_state;
+}
+
+/* Pop an event from the event pipe. */
+
+static int
+linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options)
+{
+ struct waitpid_result event = {0};
+ int ret;
+
+ do
+ {
+ ret = read (linux_nat_event_pipe[0], &event, sizeof (event));
+ }
+ while (ret == -1 && errno == EINTR);
+
+ gdb_assert (ret == sizeof (event));
+
+ *ptr_status = event.status;
+ *ptr_options = event.options;
+
+ linux_nat_num_queued_events--;
+
+ return event.pid;
+}
+
+/* Push an event into the event pipe. */
+
+static void
+linux_nat_event_pipe_push (int pid, int status, int options)
+{
+ int ret;
+ struct waitpid_result event = {0};
+ event.pid = pid;
+ event.status = status;
+ event.options = options;
+
+ do
+ {
+ ret = write (linux_nat_event_pipe[1], &event, sizeof (event));
+ gdb_assert ((ret == -1 && errno == EINTR) || ret == sizeof (event));
+ } while (ret == -1 && errno == EINTR);
+
+ linux_nat_num_queued_events++;
+}
+
+static void
+get_pending_events (void)
+{
+ int status, options, pid;
+
+ if (!linux_nat_async_enabled || !linux_nat_async_events_enabled)
+ internal_error (__FILE__, __LINE__,
+ "get_pending_events called with async masked");
+
+ while (1)
+ {
+ status = 0;
+ options = __WCLONE | WNOHANG;
+
+ do
+ {
+ pid = waitpid (-1, &status, options);
+ }
+ while (pid == -1 && errno == EINTR);
+
+ if (pid <= 0)
+ {
+ options = WNOHANG;
+ do
+ {
+ pid = waitpid (-1, &status, options);
+ }
+ while (pid == -1 && errno == EINTR);
+ }
+
+ if (pid <= 0)
+ /* No more children reporting events. */
+ break;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "\
+get_pending_events: pid(%d), status(%x), options (%x)\n",
+ pid, status, options);
+
+ linux_nat_event_pipe_push (pid, status, options);
+ }
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "\
+get_pending_events: linux_nat_num_queued_events(%d)\n",
+ linux_nat_num_queued_events);
+}
+
+/* SIGCHLD handler for async mode. */
+
+static void
+async_sigchld_handler (int signo)
+{
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "async_sigchld_handler\n");
+
+ get_pending_events ();
+}
+
+/* Enable or disable async SIGCHLD handling. */
+
+static int
+linux_nat_async_events (int enable)
+{
+ int current_state = linux_nat_async_events_enabled;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog,
+ "LNAE: enable(%d): linux_nat_async_events_enabled(%d), "
+ "linux_nat_num_queued_events(%d)\n",
+ enable, linux_nat_async_events_enabled,
+ linux_nat_num_queued_events);
+
+ if (current_state != enable)
+ {
+ sigset_t mask;
+ sigemptyset (&mask);
+ sigaddset (&mask, SIGCHLD);
+ if (enable)
+ {
+ /* Unblock target events. */
+ linux_nat_async_events_enabled = 1;
+
+ local_event_queue_to_pipe ();
+ /* While in masked async, we may have not collected all the
+ pending events. Get them out now. */
+ get_pending_events ();
+ sigprocmask (SIG_UNBLOCK, &mask, NULL);
+ }
+ else
+ {
+ /* Block target events. */
+ sigprocmask (SIG_BLOCK, &mask, NULL);
+ linux_nat_async_events_enabled = 0;
+ /* Get events out of queue, and make them available to
+ queued_waitpid / my_waitpid. */
+ pipe_to_local_event_queue ();
+ }
+ }
+
+ return current_state;
+}
+
+static int async_terminal_is_ours = 1;
+
+/* target_terminal_inferior implementation. */
+
+static void
+linux_nat_terminal_inferior (void)
+{
+ if (!target_is_async_p ())
+ {
+ /* Async mode is disabled. */
+ terminal_inferior ();
+ return;
+ }
+
+ /* GDB should never give the terminal to the inferior, if the
+ inferior is running in the background (run&, continue&, etc.).
+ This check can be removed when the common code is fixed. */
+ if (!sync_execution)
+ return;
+
+ terminal_inferior ();
+
+ if (!async_terminal_is_ours)
+ return;
+
+ delete_file_handler (input_fd);
+ async_terminal_is_ours = 0;
+ set_sigint_trap ();
+}
+
+/* target_terminal_ours implementation. */
+
void
-_initialize_linux_nat (void)
+linux_nat_terminal_ours (void)
{
- struct sigaction action;
- extern void thread_db_init (struct target_ops *);
+ if (!target_is_async_p ())
+ {
+ /* Async mode is disabled. */
+ terminal_ours ();
+ return;
+ }
+
+ /* GDB should never give the terminal to the inferior if the
+ inferior is running in the background (run&, continue&, etc.),
+ but claiming it sure should. */
+ terminal_ours ();
+
+ if (!sync_execution)
+ return;
+
+ if (async_terminal_is_ours)
+ return;
+
+ clear_sigint_trap ();
+ add_file_handler (input_fd, stdin_event_handler, 0);
+ async_terminal_is_ours = 1;
+}
+
+static void (*async_client_callback) (enum inferior_event_type event_type,
+ void *context);
+static void *async_client_context;
+
+static void
+linux_nat_async_file_handler (int error, gdb_client_data client_data)
+{
+ async_client_callback (INF_REG_EVENT, async_client_context);
+}
+
+/* target_async implementation. */
+
+static void
+linux_nat_async (void (*callback) (enum inferior_event_type event_type,
+ void *context), void *context)
+{
+ if (linux_nat_async_mask_value == 0 || !linux_nat_async_enabled)
+ internal_error (__FILE__, __LINE__,
+ "Calling target_async when async is masked");
+
+ if (callback != NULL)
+ {
+ async_client_callback = callback;
+ async_client_context = context;
+ add_file_handler (linux_nat_event_pipe[0],
+ linux_nat_async_file_handler, NULL);
+
+ linux_nat_async_events (1);
+ }
+ else
+ {
+ async_client_callback = callback;
+ async_client_context = context;
+
+ linux_nat_async_events (0);
+ delete_file_handler (linux_nat_event_pipe[0]);
+ }
+ return;
+}
+
+/* Enable/Disable async mode. */
+
+static void
+linux_nat_set_async_mode (int on)
+{
+ if (linux_nat_async_enabled != on)
+ {
+ if (on)
+ {
+ gdb_assert (waitpid_queue == NULL);
+ sigaction (SIGCHLD, &async_sigchld_action, NULL);
+
+ if (pipe (linux_nat_event_pipe) == -1)
+ internal_error (__FILE__, __LINE__,
+ "creating event pipe failed.");
+
+ fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK);
+ fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK);
+ }
+ else
+ {
+ sigaction (SIGCHLD, &sync_sigchld_action, NULL);
+
+ drain_queued_events (-1);
+
+ linux_nat_num_queued_events = 0;
+ close (linux_nat_event_pipe[0]);
+ close (linux_nat_event_pipe[1]);
+ linux_nat_event_pipe[0] = linux_nat_event_pipe[1] = -1;
+
+ }
+ }
+ linux_nat_async_enabled = on;
+}
+
+void
+linux_nat_add_target (struct target_ops *t)
+{
+ /* Save the provided single-threaded target. We save this in a separate
+ variable because another target we've inherited from (e.g. inf-ptrace)
+ may have saved a pointer to T; we want to use it for the final
+ process stratum target. */
+ linux_ops_saved = *t;
+ linux_ops = &linux_ops_saved;
+
+ /* Override some methods for multithreading. */
+ t->to_create_inferior = linux_nat_create_inferior;
+ t->to_attach = linux_nat_attach;
+ t->to_detach = linux_nat_detach;
+ t->to_resume = linux_nat_resume;
+ t->to_wait = linux_nat_wait;
+ t->to_xfer_partial = linux_nat_xfer_partial;
+ t->to_kill = linux_nat_kill;
+ t->to_mourn_inferior = linux_nat_mourn_inferior;
+ t->to_thread_alive = linux_nat_thread_alive;
+ t->to_pid_to_str = linux_nat_pid_to_str;
+ t->to_has_thread_control = tc_schedlock;
+
+ t->to_can_async_p = linux_nat_can_async_p;
+ t->to_is_async_p = linux_nat_is_async_p;
+ t->to_async = linux_nat_async;
+ t->to_async_mask = linux_nat_async_mask;
+ t->to_terminal_inferior = linux_nat_terminal_inferior;
+ t->to_terminal_ours = linux_nat_terminal_ours;
+
+ /* We don't change the stratum; this target will sit at
+ process_stratum and thread_db will set at thread_stratum. This
+ is a little strange, since this is a multi-threaded-capable
+ target, but we want to be on the stack below thread_db, and we
+ also want to be used for single-threaded processes. */
+
+ add_target (t);
+
+ /* TODO: Eliminate this and have libthread_db use
+ find_target_beneath. */
+ thread_db_init (t);
+}
+
+/* Register a method to call whenever a new thread is attached. */
+void
+linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t))
+{
+ /* Save the pointer. We only support a single registered instance
+ of the GNU/Linux native target, so we do not need to map this to
+ T. */
+ linux_nat_new_thread = new_thread;
+}
+
+/* Return the saved siginfo associated with PTID. */
+struct siginfo *
+linux_nat_get_siginfo (ptid_t ptid)
+{
+ struct lwp_info *lp = find_lwp_pid (ptid);
- deprecated_child_ops.to_find_memory_regions = linux_nat_find_memory_regions;
- deprecated_child_ops.to_make_corefile_notes = linux_nat_make_corefile_notes;
+ gdb_assert (lp != NULL);
+
+ return &lp->siginfo;
+}
+
+void
+_initialize_linux_nat (void)
+{
+ sigset_t mask;
- add_info ("proc", linux_nat_info_proc_cmd,
- "Show /proc process information about any running process.\n\
+ add_info ("proc", linux_nat_info_proc_cmd, _("\
+Show /proc process information about any running process.\n\
Specify any process id, or use the program being debugged by default.\n\
Specify any of the following keywords for detailed info:\n\
mappings -- list of mapped memory regions.\n\
stat -- list a bunch of random process info.\n\
status -- list a different bunch of random process info.\n\
- all -- list all available /proc info.");
-
- init_linux_nat_ops ();
- add_target (&linux_nat_ops);
- thread_db_init (&linux_nat_ops);
-
- /* Save the original signal mask. */
+ all -- list all available /proc info."));
+
+ add_setshow_zinteger_cmd ("lin-lwp", class_maintenance,
+ &debug_linux_nat, _("\
+Set debugging of GNU/Linux lwp module."), _("\
+Show debugging of GNU/Linux lwp module."), _("\
+Enables printf debugging output."),
+ NULL,
+ show_debug_linux_nat,
+ &setdebuglist, &showdebuglist);
+
+ add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance,
+ &debug_linux_nat_async, _("\
+Set debugging of GNU/Linux async lwp module."), _("\
+Show debugging of GNU/Linux async lwp module."), _("\
+Enables printf debugging output."),
+ NULL,
+ show_debug_linux_nat_async,
+ &setdebuglist, &showdebuglist);
+
+ add_setshow_boolean_cmd ("linux-async", class_maintenance,
+ &linux_async_permitted_1, _("\
+Set whether gdb controls the GNU/Linux inferior in asynchronous mode."), _("\
+Show whether gdb controls the GNU/Linux inferior in asynchronous mode."), _("\
+Tells gdb whether to control the GNU/Linux inferior in asynchronous mode."),
+ set_maintenance_linux_async_permitted,
+ show_maintenance_linux_async_permitted,
+ &maintenance_set_cmdlist,
+ &maintenance_show_cmdlist);
+
+ /* Block SIGCHLD by default. Doing this early prevents it getting
+ unblocked if an exception is thrown due to an error while the
+ inferior is starting (sigsetjmp/siglongjmp). */
+ sigemptyset (&mask);
+ sigaddset (&mask, SIGCHLD);
+ sigprocmask (SIG_BLOCK, &mask, NULL);
+
+ /* Save this mask as the default. */
sigprocmask (SIG_SETMASK, NULL, &normal_mask);
- action.sa_handler = sigchld_handler;
- sigemptyset (&action.sa_mask);
- action.sa_flags = 0;
- sigaction (SIGCHLD, &action, NULL);
+ /* The synchronous SIGCHLD handler. */
+ sync_sigchld_action.sa_handler = sigchld_handler;
+ sigemptyset (&sync_sigchld_action.sa_mask);
+ sync_sigchld_action.sa_flags = SA_RESTART;
+
+ /* Make it the default. */
+ sigaction (SIGCHLD, &sync_sigchld_action, NULL);
/* Make sure we don't block SIGCHLD during a sigsuspend. */
sigprocmask (SIG_SETMASK, NULL, &suspend_mask);
sigdelset (&suspend_mask, SIGCHLD);
- sigemptyset (&blocked_mask);
+ /* SIGCHLD handler for async mode. */
+ async_sigchld_action.sa_handler = async_sigchld_handler;
+ sigemptyset (&async_sigchld_action.sa_mask);
+ async_sigchld_action.sa_flags = SA_RESTART;
- deprecated_add_show_from_set
- (add_set_cmd ("lin-lwp", no_class, var_zinteger,
- (char *) &debug_linux_nat,
- "Set debugging of GNU/Linux lwp module.\n\
-Enables printf debugging output.\n", &setdebuglist), &showdebuglist);
+ /* Install the default mode. */
+ linux_nat_set_async_mode (linux_async_permitted);
}
\f
if (ms == NULL)
return 0;
- if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (char *) &signo,
+ if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo,
sizeof (signo)) != 0)
return 0;
{
struct sigaction action;
int restart, cancel;
+ sigset_t blocked_mask;
+ sigemptyset (&blocked_mask);
sigemptyset (set);
restart = get_signo ("__pthread_sig_restart");
+ cancel = get_signo ("__pthread_sig_cancel");
+
+ /* LinuxThreads normally uses the first two RT signals, but in some legacy
+ cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
+ not provide any way for the debugger to query the signal numbers -
+ fortunately they don't change! */
+
if (restart == 0)
- return;
+ restart = __SIGRTMIN;
- cancel = get_signo ("__pthread_sig_cancel");
if (cancel == 0)
- return;
+ cancel = __SIGRTMIN + 1;
sigaddset (set, restart);
sigaddset (set, cancel);
action.sa_handler = sigchld_handler;
sigemptyset (&action.sa_mask);
- action.sa_flags = 0;
+ action.sa_flags = SA_RESTART;
sigaction (cancel, &action, NULL);
/* We block the "cancel" signal throughout this code ... */
/* ... except during a sigsuspend. */
sigdelset (&suspend_mask, cancel);
}
+
projects / deliverable / binutils-gdb.git / blobdiff