#include "inf-loop.h"
#include "event-loop.h"
#include "event-top.h"
+#include <pwd.h>
+#include <sys/types.h>
+#include "gdb_dirent.h"
+#include "xml-support.h"
#ifdef HAVE_PERSONALITY
# include <sys/personality.h>
static int linux_nat_async_mask (int mask);
static int kill_lwp (int lwpid, int signo);
-static int send_sigint_callback (struct lwp_info *lp, void *data);
static int stop_callback (struct lwp_info *lp, void *data);
/* Captures the result of a successful waitpid call, along with the
in the async SIGCHLD handler. */
static struct waitpid_result *waitpid_queue = NULL;
+/* Similarly to `waitpid', but check the local event queue instead of
+ querying the kernel queue. If PEEK, don't remove the event found
+ from the queue. */
+
static int
-queued_waitpid (int pid, int *status, int flags)
+queued_waitpid_1 (int pid, int *status, int flags, int peek)
{
struct waitpid_result *msg = waitpid_queue, *prev = NULL;
{
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);
+
+ if (!peek)
+ {
+ if (prev)
+ prev->next = msg->next;
+ else
+ waitpid_queue = msg->next;
+
+ msg->next = NULL;
+ xfree (msg);
+ }
return pid;
}
return -1;
}
+/* Similarly to `waitpid', but check the local event queue. */
+
+static int
+queued_waitpid (int pid, int *status, int flags)
+{
+ return queued_waitpid_1 (pid, status, flags, 0);
+}
+
static void
push_waitpid (int pid, int status, int options)
{
else
{
struct fork_info *fp;
+
+ /* Add process to GDB's tables. */
+ add_inferior (child_pid);
+
/* Retain child fork in ptrace (stopped) state. */
fp = find_fork_pid (child_pid);
if (!fp)
}
else
{
+ struct thread_info *last_tp = find_thread_pid (last_ptid);
+ struct thread_info *tp;
char child_pid_spelling[40];
+ /* Copy user stepping state to the new inferior thread. */
+ struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint;
+ CORE_ADDR step_range_start = last_tp->step_range_start;
+ CORE_ADDR step_range_end = last_tp->step_range_end;
+ struct frame_id step_frame_id = last_tp->step_frame_id;
+
+ /* Otherwise, deleting the parent would get rid of this
+ breakpoint. */
+ last_tp->step_resume_breakpoint = NULL;
+
/* Needed to keep the breakpoint lists in sync. */
if (! has_vforked)
detach_breakpoints (child_pid);
safely resume it. */
if (has_vforked)
- linux_parent_pid = parent_pid;
+ {
+ linux_parent_pid = parent_pid;
+ detach_inferior (parent_pid);
+ }
else if (!detach_fork)
{
struct fork_info *fp;
target_detach (NULL, 0);
inferior_ptid = ptid_build (child_pid, child_pid, 0);
+ add_inferior (child_pid);
/* Reinstall ourselves, since we might have been removed in
target_detach (which does other necessary cleanup). */
linux_nat_switch_fork (inferior_ptid);
check_for_thread_db ();
+ tp = inferior_thread ();
+ tp->step_resume_breakpoint = step_resume_breakpoint;
+ tp->step_range_start = step_range_start;
+ tp->step_range_end = step_range_end;
+ tp->step_frame_id = step_frame_id;
+
/* Reset breakpoints in the child as appropriate. */
follow_inferior_reset_breakpoints ();
}
}
static void
-linux_nat_create_inferior (char *exec_file, char *allargs, char **env,
+linux_nat_create_inferior (struct target_ops *ops,
+ char *exec_file, char *allargs, char **env,
int from_tty)
{
int saved_async = 0;
}
#endif /* HAVE_PERSONALITY */
- linux_ops->to_create_inferior (exec_file, allargs, env, from_tty);
+ linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty);
#ifdef HAVE_PERSONALITY
if (personality_set)
}
static void
-linux_nat_attach (char *args, int from_tty)
+linux_nat_attach (struct target_ops *ops, char *args, int from_tty)
{
struct lwp_info *lp;
int status;
/* FIXME: We should probably accept a list of process id's, and
attach all of them. */
- linux_ops->to_attach (args, from_tty);
+ linux_ops->to_attach (ops, args, from_tty);
if (!target_can_async_p ())
{
queue. */
if (queued_waitpid (GET_LWP (lp->ptid), status, __WALL) != -1)
{
- if (WIFSTOPPED (status))
- signo = target_signal_from_host (WSTOPSIG (status));
+ if (WIFSTOPPED (*status))
+ signo = target_signal_from_host (WSTOPSIG (*status));
/* If not stopped, then the lwp is gone, no use in
resending a signal. */
{
/* If the core knows the thread is not executing, then we
have the last signal recorded in
- thread_info->stop_signal, unless this is inferior_ptid,
- in which case, it's in the global stop_signal, due to
- context switching. */
+ thread_info->stop_signal. */
- if (ptid_equal (lp->ptid, inferior_ptid))
- signo = stop_signal;
- else
- {
- struct thread_info *tp = find_thread_pid (lp->ptid);
- gdb_assert (tp);
- signo = tp->stop_signal;
- }
+ struct thread_info *tp = find_thread_pid (lp->ptid);
+ signo = tp->stop_signal;
}
if (signo != TARGET_SIGNAL_0
{
if (GET_LWP (lp->ptid) == GET_LWP (last_ptid))
{
- if (stop_signal != TARGET_SIGNAL_0
- && signal_pass_state (stop_signal))
- *status = W_STOPCODE (target_signal_to_host (stop_signal));
+ struct thread_info *tp = find_thread_pid (lp->ptid);
+ if (tp->stop_signal != TARGET_SIGNAL_0
+ && signal_pass_state (tp->stop_signal))
+ *status = W_STOPCODE (target_signal_to_host (tp->stop_signal));
}
else if (target_can_async_p ())
queued_waitpid (GET_LWP (lp->ptid), status, __WALL);
}
static void
-linux_nat_detach (char *args, int from_tty)
+linux_nat_detach (struct target_ops *ops, char *args, int from_tty)
{
int pid;
int status;
pid = GET_PID (inferior_ptid);
inferior_ptid = pid_to_ptid (pid);
- linux_ops->to_detach (args, from_tty);
+ linux_ops->to_detach (ops, args, from_tty);
if (target_can_async_p ())
drain_queued_events (pid);
if (lp->status && WIFSTOPPED (lp->status))
{
- int saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
+ int saved_signo;
+ struct inferior *inf;
- if (signal_stop_state (saved_signo) == 0
+ inf = find_inferior_pid (ptid_get_pid (ptid));
+ gdb_assert (inf);
+ saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
+
+ /* Defer to common code if we're gaining control of the
+ inferior. */
+ if (inf->stop_soon == NO_STOP_QUIETLY
+ && signal_stop_state (saved_signo) == 0
&& signal_print_state (saved_signo) == 0
&& signal_pass_state (saved_signo) == 1)
{
/* 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));
+ fprintf_unfiltered (gdb_stdlog, "\
+SWC: leaving SIGTRAP in local queue of %s\n", target_pid_to_str (lp->ptid));
+ push_waitpid (GET_LWP (lp->ptid),
+ W_STOPCODE (SIGTRAP),
+ lp->cloned ? __WCLONE : 0);
}
}
else
if (WIFSTOPPED (status))
{
int signo = target_signal_from_host (WSTOPSIG (status));
+ struct inferior *inf;
- /* If we get a signal while single-stepping, we may need special
- care, e.g. to skip the signal handler. Defer to common code. */
+ inf = find_inferior_pid (ptid_get_pid (lp->ptid));
+ gdb_assert (inf);
+
+ /* Defer to common code if we get a signal while
+ single-stepping, since that may need special care, e.g. to
+ skip the signal handler, or, if we're gaining control of the
+ inferior. */
if (!lp->step
+ && inf->stop_soon == NO_STOP_QUIETLY
&& signal_stop_state (signo) == 0
&& signal_print_state (signo) == 0
&& signal_pass_state (signo) == 1)
goto retry;
}
- if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0)
+ if (!non_stop)
{
- /* If ^C/BREAK is typed at the tty/console, SIGINT gets
- forwarded to the entire process group, that is, all LWPs
- will receive it - unless they're using CLONE_THREAD to
- share signals. Since we only want to report it once, we
- mark it as ignored for all LWPs except this one. */
- iterate_over_lwps (set_ignore_sigint, NULL);
- lp->ignore_sigint = 0;
+ /* Only do the below in all-stop, as we currently use SIGINT
+ to implement target_stop (see linux_nat_stop) in
+ non-stop. */
+ if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0)
+ {
+ /* If ^C/BREAK is typed at the tty/console, SIGINT gets
+ forwarded to the entire process group, that is, all LWPs
+ will receive it - unless they're using CLONE_THREAD to
+ share signals. Since we only want to report it once, we
+ mark it as ignored for all LWPs except this one. */
+ iterate_over_lwps (set_ignore_sigint, NULL);
+ lp->ignore_sigint = 0;
+ }
+ else
+ maybe_clear_ignore_sigint (lp);
}
- else
- maybe_clear_ignore_sigint (lp);
}
/* This LWP is stopped now. */
}
static void
-linux_nat_mourn_inferior (void)
+linux_nat_mourn_inferior (struct target_ops *ops)
{
/* Destroy LWP info; it's no longer valid. */
init_lwp_list ();
/* Normal case, no other forks available. */
if (target_can_async_p ())
linux_nat_async (NULL, 0);
- linux_ops->to_mourn_inferior ();
+ linux_ops->to_mourn_inferior (ops);
}
else
/* Multi-fork case. The current inferior_ptid has exited, but
char permissions[8], device[8], filename[MAXPATHLEN];
int read, write, exec;
int ret;
+ struct cleanup *cleanup;
/* 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."), mapsfilename);
+ cleanup = make_cleanup_fclose (mapsfile);
if (info_verbose)
fprintf_filtered (gdb_stdout,
segment. */
func (addr, size, read, write, exec, obfd);
}
- fclose (mapsfile);
+ do_cleanups (cleanup);
return 0;
}
+static int
+find_signalled_thread (struct thread_info *info, void *data)
+{
+ if (info->stop_signal != TARGET_SIGNAL_0
+ && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
+ return 1;
+
+ return 0;
+}
+
+static enum target_signal
+find_stop_signal (void)
+{
+ struct thread_info *info =
+ iterate_over_threads (find_signalled_thread, NULL);
+
+ if (info)
+ return info->stop_signal;
+ else
+ return TARGET_SIGNAL_0;
+}
+
/* Records the thread's register state for the corefile note
section. */
static char *
linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid,
- char *note_data, int *note_size)
+ char *note_data, int *note_size,
+ enum target_signal stop_signal)
{
gdb_gregset_t gregs;
gdb_fpregset_t fpregs;
char *note_data;
int *note_size;
int num_notes;
+ enum target_signal stop_signal;
};
/* Called by gdbthread.c once per thread. Records the thread's
args->note_data = linux_nat_do_thread_registers (args->obfd,
ti->ptid,
args->note_data,
- args->note_size);
+ args->note_size,
+ args->stop_signal);
args->num_notes++;
return 0;
}
-/* Records the register state for the corefile note section. */
-
-static char *
-linux_nat_do_registers (bfd *obfd, ptid_t ptid,
- char *note_data, int *note_size)
-{
- return linux_nat_do_thread_registers (obfd,
- ptid_build (ptid_get_pid (inferior_ptid),
- ptid_get_pid (inferior_ptid),
- 0),
- note_data, note_size);
-}
-
/* Fills the "to_make_corefile_note" target vector. Builds the note
section for a corefile, and returns it in a malloc buffer. */
thread_args.note_data = note_data;
thread_args.note_size = note_size;
thread_args.num_notes = 0;
+ thread_args.stop_signal = find_stop_signal ();
iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args);
- if (thread_args.num_notes == 0)
- {
- /* iterate_over_threads didn't come up with any threads; just
- use inferior_ptid. */
- note_data = linux_nat_do_registers (obfd, inferior_ptid,
- note_data, note_size);
- }
- else
- {
- note_data = thread_args.note_data;
- }
+ gdb_assert (thread_args.num_notes != 0);
+ note_data = thread_args.note_data;
auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV,
NULL, &auxv);
if (args)
{
/* Break up 'args' into an argv array. */
- if ((argv = buildargv (args)) == NULL)
- nomem (0);
- else
- make_cleanup_freeargv (argv);
+ argv = gdb_buildargv (args);
+ make_cleanup_freeargv (argv);
}
while (argv != NULL && *argv != NULL)
{
sprintf (fname1, "/proc/%lld/cmdline", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
+ struct cleanup *cleanup = make_cleanup_fclose (procfile);
fgets (buffer, sizeof (buffer), procfile);
printf_filtered ("cmdline = '%s'\n", buffer);
- fclose (procfile);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
{
long long addr, endaddr, size, offset, inode;
char permissions[8], device[8], filename[MAXPATHLEN];
+ struct cleanup *cleanup;
+ cleanup = make_cleanup_fclose (procfile);
printf_filtered (_("Mapped address spaces:\n\n"));
if (gdbarch_addr_bit (current_gdbarch) == 32)
{
}
}
- fclose (procfile);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
sprintf (fname1, "/proc/%lld/status", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
+ struct cleanup *cleanup = make_cleanup_fclose (procfile);
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
puts_filtered (buffer);
- fclose (procfile);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
int itmp;
char ctmp;
long ltmp;
+ struct cleanup *cleanup = make_cleanup_fclose (procfile);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered (_("Process: %d\n"), itmp);
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp);
#endif
- fclose (procfile);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
FILE *procfile;
char buffer[MAXPATHLEN], fname[MAXPATHLEN];
int signum;
+ struct cleanup *cleanup;
sigemptyset (pending);
sigemptyset (blocked);
procfile = fopen (fname, "r");
if (procfile == NULL)
error (_("Could not open %s"), fname);
+ cleanup = make_cleanup_fclose (procfile);
while (fgets (buffer, MAXPATHLEN, procfile) != NULL)
{
add_line_to_sigset (buffer + 8, ignored);
}
- fclose (procfile);
+ do_cleanups (cleanup);
+}
+
+static LONGEST
+linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+{
+ /* We make the process list snapshot when the object starts to be
+ read. */
+ static const char *buf;
+ static LONGEST len_avail = -1;
+ static struct obstack obstack;
+
+ DIR *dirp;
+
+ gdb_assert (object == TARGET_OBJECT_OSDATA);
+
+ if (strcmp (annex, "processes") != 0)
+ return 0;
+
+ gdb_assert (readbuf && !writebuf);
+
+ if (offset == 0)
+ {
+ if (len_avail != -1 && len_avail != 0)
+ obstack_free (&obstack, NULL);
+ len_avail = 0;
+ buf = NULL;
+ obstack_init (&obstack);
+ obstack_grow_str (&obstack, "<osdata type=\"processes\">\n");
+
+ dirp = opendir ("/proc");
+ if (dirp)
+ {
+ struct dirent *dp;
+ while ((dp = readdir (dirp)) != NULL)
+ {
+ struct stat statbuf;
+ char procentry[sizeof ("/proc/4294967295")];
+
+ if (!isdigit (dp->d_name[0])
+ || strlen (dp->d_name) > sizeof ("4294967295") - 1)
+ continue;
+
+ sprintf (procentry, "/proc/%s", dp->d_name);
+ if (stat (procentry, &statbuf) == 0
+ && S_ISDIR (statbuf.st_mode))
+ {
+ char *pathname;
+ FILE *f;
+ char cmd[MAXPATHLEN + 1];
+ struct passwd *entry;
+
+ pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name);
+ entry = getpwuid (statbuf.st_uid);
+
+ if ((f = fopen (pathname, "r")) != NULL)
+ {
+ size_t len = fread (cmd, 1, sizeof (cmd) - 1, f);
+ if (len > 0)
+ {
+ int i;
+ for (i = 0; i < len; i++)
+ if (cmd[i] == '\0')
+ cmd[i] = ' ';
+ cmd[len] = '\0';
+
+ obstack_xml_printf (
+ &obstack,
+ "<item>"
+ "<column name=\"pid\">%s</column>"
+ "<column name=\"user\">%s</column>"
+ "<column name=\"command\">%s</column>"
+ "</item>",
+ dp->d_name,
+ entry ? entry->pw_name : "?",
+ cmd);
+ }
+ fclose (f);
+ }
+
+ xfree (pathname);
+ }
+ }
+
+ closedir (dirp);
+ }
+
+ obstack_grow_str0 (&obstack, "</osdata>\n");
+ buf = obstack_finish (&obstack);
+ len_avail = strlen (buf);
+ }
+
+ if (offset >= len_avail)
+ {
+ /* Done. Get rid of the obstack. */
+ obstack_free (&obstack, NULL);
+ buf = NULL;
+ len_avail = 0;
+ return 0;
+ }
+
+ if (len > len_avail - offset)
+ len = len_avail - offset;
+ memcpy (readbuf, buf + offset, len);
+
+ return len;
}
static LONGEST
return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf,
offset, len);
+ if (object == TARGET_OBJECT_OSDATA)
+ return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf,
+ offset, len);
+
xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf,
offset, len);
if (xfer != 0)
return;
}
+/* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
+ event came out. */
+
static int
-send_sigint_callback (struct lwp_info *lp, void *data)
+linux_nat_stop_lwp (struct lwp_info *lwp, void *data)
{
- /* Use is_running instead of !lp->stopped, because the lwp may be
- stopped due to an internal event, and we want to interrupt it in
- that case too. What we want is to check if the thread is stopped
- from the point of view of the user. */
- if (is_running (lp->ptid))
- kill_lwp (GET_LWP (lp->ptid), SIGINT);
+ ptid_t ptid = * (ptid_t *) data;
+
+ if (ptid_equal (lwp->ptid, ptid)
+ || ptid_equal (minus_one_ptid, ptid)
+ || (ptid_is_pid (ptid)
+ && ptid_get_pid (ptid) == ptid_get_pid (lwp->ptid)))
+ {
+ if (!lwp->stopped)
+ {
+ int pid, status;
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LNSL: running -> suspending %s\n",
+ target_pid_to_str (lwp->ptid));
+
+ /* Peek once, to check if we've already waited for this
+ LWP. */
+ pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status,
+ lwp->cloned ? __WCLONE : 0, 1 /* peek */);
+
+ if (pid == -1)
+ {
+ ptid_t ptid = lwp->ptid;
+
+ stop_callback (lwp, NULL);
+ stop_wait_callback (lwp, NULL);
+
+ /* If the lwp exits while we try to stop it, there's
+ nothing else to do. */
+ lwp = find_lwp_pid (ptid);
+ if (lwp == NULL)
+ return 0;
+
+ pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status,
+ lwp->cloned ? __WCLONE : 0,
+ 1 /* peek */);
+ }
+
+ /* If we didn't collect any signal other than SIGSTOP while
+ stopping the LWP, push a SIGNAL_0 event. In either case,
+ the event-loop will end up calling target_wait which will
+ collect these. */
+ if (pid == -1)
+ push_waitpid (ptid_get_lwp (lwp->ptid), W_STOPCODE (0),
+ lwp->cloned ? __WCLONE : 0);
+ }
+ else
+ {
+ /* Already known to be stopped; do nothing. */
+
+ if (debug_linux_nat)
+ {
+ if (find_thread_pid (lwp->ptid)->stop_requested)
+ fprintf_unfiltered (gdb_stdlog, "\
+LNSL: already stopped/stop_requested %s\n",
+ target_pid_to_str (lwp->ptid));
+ else
+ fprintf_unfiltered (gdb_stdlog, "\
+LNSL: already stopped/no stop_requested yet %s\n",
+ target_pid_to_str (lwp->ptid));
+ }
+ }
+ }
return 0;
}
{
if (non_stop)
{
- if (ptid_equal (ptid, minus_one_ptid))
- iterate_over_lwps (send_sigint_callback, &ptid);
- else
- {
- struct lwp_info *lp = find_lwp_pid (ptid);
- send_sigint_callback (lp, NULL);
- }
+ linux_nat_async_events (sigchld_sync);
+ iterate_over_lwps (linux_nat_stop_lwp, &ptid);
+ target_async (inferior_event_handler, 0);
}
else
linux_ops->to_stop (ptid);
projects / deliverable / binutils-gdb.git / blobdiff