/* GNU/Linux native-dependent code for debugging multiple forks.
- Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
+ Free Software Foundation, Inc.
This file is part of GDB.
#include "gdb_string.h"
#include "linux-fork.h"
#include "linux-nat.h"
+#include "gdbthread.h"
#include <sys/ptrace.h>
#include "gdb_wait.h"
/* Prevent warning from -Wmissing-prototypes. */
extern void _initialize_linux_fork (void);
-int detach_fork = 1; /* Default behavior is to detach
- newly forked processes (legacy). */
-
/* Fork list data structure: */
struct fork_info
{
struct fork_info *next;
ptid_t ptid;
- int num; /* Convenient handle (GDB fork id) */
- struct regcache *savedregs; /* Convenient for info fork, saves
+ ptid_t parent_ptid;
+ int num; /* Convenient handle (GDB fork id). */
+ struct regcache *savedregs; /* Convenient for info fork, saves
having to actually switch contexts. */
int clobber_regs; /* True if we should restore saved regs. */
off_t *filepos; /* Set of open file descriptors' offsets. */
/* Fork list methods: */
-extern int
+int
forks_exist_p (void)
{
return (fork_list != NULL);
}
-/* Add a fork to internal fork list.
- Called from linux child_follow_fork. */
+/* Add a fork to the internal fork list. */
-extern struct fork_info *
+struct fork_info *
add_fork (pid_t pid)
{
struct fork_info *fp;
free_fork (fp);
- /* Special case: if there is now only one process in the list,
+ /* Special case: if there is now only one process in the list,
and if it is (hopefully!) the current inferior_ptid, then
remove it, leaving the list empty -- we're now down to the
default case of debugging a single process. */
/* Fork list <-> gdb interface. */
-/* Utility function for fork_load/fork_save.
+/* Utility function for fork_load/fork_save.
Calls lseek in the (current) inferior process. */
static off_t
fp->maxfd = tmp;
}
/* Allocate array of file positions. */
- fp->filepos = xrealloc (fp->filepos,
+ fp->filepos = xrealloc (fp->filepos,
(fp->maxfd + 1) * sizeof (*fp->filepos));
/* Initialize to -1 (invalid). */
/* Kill 'em all, let God sort 'em out... */
-extern void
+void
linux_fork_killall (void)
{
/* Walk list and kill every pid. No need to treat the
forks to debug. Delete the exiting one and context-switch to the
first available. */
-extern void
+void
linux_fork_mourn_inferior (void)
{
/* Wait just one more time to collect the inferior's exit status.
viable forks to debug. Detach and delete it and context-switch to
the first available. */
-extern void
+void
linux_fork_detach (char *args, int from_tty)
{
/* OK, inferior_ptid is the one we are detaching from. We need to
delete_fork (inferior_ptid);
}
+static void
+inferior_call_waitpid_cleanup (void *fp)
+{
+ struct fork_info *oldfp = fp;
+
+ if (oldfp)
+ {
+ /* Switch back to inferior_ptid. */
+ remove_breakpoints ();
+ fork_load_infrun_state (oldfp);
+ insert_breakpoints ();
+ }
+}
+
+static int
+inferior_call_waitpid (ptid_t pptid, int pid)
+{
+ struct objfile *waitpid_objf;
+ struct value *waitpid_fn = NULL;
+ struct value *argv[4], *retv;
+ struct gdbarch *gdbarch = get_current_arch ();
+ struct fork_info *oldfp = NULL, *newfp = NULL;
+ struct cleanup *old_cleanup;
+ int ret = -1;
+
+ if (!ptid_equal (pptid, inferior_ptid))
+ {
+ /* Switch to pptid. */
+ oldfp = find_fork_ptid (inferior_ptid);
+ gdb_assert (oldfp != NULL);
+ newfp = find_fork_ptid (pptid);
+ gdb_assert (newfp != NULL);
+ fork_save_infrun_state (oldfp, 1);
+ remove_breakpoints ();
+ fork_load_infrun_state (newfp);
+ insert_breakpoints ();
+ }
+
+ old_cleanup = make_cleanup (inferior_call_waitpid_cleanup, oldfp);
+
+ /* Get the waitpid_fn. */
+ if (lookup_minimal_symbol ("waitpid", NULL, NULL) != NULL)
+ waitpid_fn = find_function_in_inferior ("waitpid", &waitpid_objf);
+ if (!waitpid_fn && lookup_minimal_symbol ("_waitpid", NULL, NULL) != NULL)
+ waitpid_fn = find_function_in_inferior ("_waitpid", &waitpid_objf);
+ if (!waitpid_fn)
+ goto out;
+
+ /* Get the argv. */
+ argv[0] = value_from_longest (builtin_type (gdbarch)->builtin_int, pid);
+ argv[1] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr, 0);
+ argv[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
+ argv[3] = 0;
+
+ retv = call_function_by_hand (waitpid_fn, 3, argv);
+ if (value_as_long (retv) < 0)
+ goto out;
+
+ ret = 0;
+
+out:
+ do_cleanups (old_cleanup);
+ return ret;
+}
+
/* Fork list <-> user interface. */
static void
-delete_fork_command (char *args, int from_tty)
+delete_checkpoint_command (char *args, int from_tty)
{
- ptid_t ptid;
+ ptid_t ptid, pptid;
+ struct fork_info *fi;
if (!args || !*args)
error (_("Requires argument (checkpoint id to delete)"));
error (_("No such checkpoint id, %s"), args);
if (ptid_equal (ptid, inferior_ptid))
- error (_("Please switch to another checkpoint before deleting the current one"));
+ error (_("\
+Please switch to another checkpoint before deleting the current one"));
if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0))
error (_("Unable to kill pid %s"), target_pid_to_str (ptid));
+ fi = find_fork_ptid (ptid);
+ gdb_assert (fi);
+ pptid = fi->parent_ptid;
+
if (from_tty)
printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid));
delete_fork (ptid);
+
+ /* If fi->parent_ptid is not a part of lwp but it's a part of checkpoint
+ list, waitpid the ptid.
+ If fi->parent_ptid is a part of lwp and it is stoped, waitpid the
+ ptid. */
+ if ((!find_thread_ptid (pptid) && find_fork_ptid (pptid))
+ || (find_thread_ptid (pptid) && is_stopped (pptid)))
+ {
+ if (inferior_call_waitpid (pptid, PIDGET (ptid)))
+ warning (_("Unable to wait pid %s"), target_pid_to_str (ptid));
+ }
}
static void
-detach_fork_command (char *args, int from_tty)
+detach_checkpoint_command (char *args, int from_tty)
{
ptid_t ptid;
delete_fork (ptid);
}
-/* Print information about currently known forks. */
+/* Print information about currently known checkpoints. */
static void
-info_forks_command (char *arg, int from_tty)
+info_checkpoints_command (char *arg, int from_tty)
{
struct gdbarch *gdbarch = get_current_arch ();
- struct frame_info *cur_frame;
struct symtab_and_line sal;
- struct symtab *cur_symtab;
struct fork_info *fp;
- int cur_line;
ULONGEST pc;
int requested = -1;
struct fork_info *printed = NULL;
sal = find_pc_line (pc, 0);
if (sal.symtab)
- {
- char *tmp = strrchr (sal.symtab->filename, '/');
-
- if (tmp)
- printf_filtered (_(", file %s"), tmp + 1);
- else
- printf_filtered (_(", file %s"), sal.symtab->filename);
- }
+ printf_filtered (_(", file %s"), lbasename (sal.symtab->filename));
if (sal.line)
printf_filtered (_(", line %d"), sal.line);
if (!sal.symtab && !sal.line)
struct fork_info *fp;
pid_t retpid;
struct cleanup *old_chain;
- long i;
/* Make the inferior fork, record its (and gdb's) state. */
{
int parent_pid;
- printf_filtered (_("checkpoint: fork returned pid %ld.\n"),
+ printf_filtered (_("checkpoint: fork returned pid %ld.\n"),
(long) retpid);
if (info_verbose)
{
parent_pid = ptid_get_lwp (last_target_ptid);
if (parent_pid == 0)
parent_pid = ptid_get_pid (last_target_ptid);
- printf_filtered (_(" gdb says parent = %ld.\n"),
+ printf_filtered (_(" gdb says parent = %ld.\n"),
(long) parent_pid);
}
}
if (!fp)
error (_("Failed to find new fork"));
fork_save_infrun_state (fp, 1);
+ fp->parent_ptid = last_target_ptid;
}
static void
{
/* Now we attempt to switch processes. */
struct fork_info *oldfp;
- ptid_t ptid;
- int id, i;
gdb_assert (newfp != NULL);
fork_load_infrun_state (newfp);
insert_breakpoints ();
- printf_filtered (_("Switching to %s\n"),
+ printf_filtered (_("Switching to %s\n"),
target_pid_to_str (inferior_ptid));
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
{
init_fork_list ();
- /* Set/show detach-on-fork: user-settable mode. */
-
- add_setshow_boolean_cmd ("detach-on-fork", class_obscure, &detach_fork, _("\
-Set whether gdb will detach the child of a fork."), _("\
-Show whether gdb will detach the child of a fork."), _("\
-Tells gdb whether to detach the child of a fork."),
- NULL, NULL, &setlist, &showlist);
-
- /* Set/show restart-auto-finish: user-settable count. Causes the
- first "restart" of a fork to do some number of "finish" commands
- before returning to user.
-
- Useful because otherwise the virgin fork process will be stopped
- somewhere in the un-interesting fork system call. */
-
/* Checkpoint command: create a fork of the inferior process
and set it aside for later debugging. */
Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'."));
/* Delete checkpoint command: kill the process and remove it from
- fork list. */
+ the fork list. */
- add_cmd ("checkpoint", class_obscure, delete_fork_command, _("\
+ add_cmd ("checkpoint", class_obscure, delete_checkpoint_command, _("\
Delete a checkpoint (experimental)."),
&deletelist);
- /* Detach checkpoint command: release the process to run independently,
+ /* Detach checkpoint command: release the process to run independently,
and remove it from the fork list. */
- add_cmd ("checkpoint", class_obscure, detach_fork_command, _("\
+ add_cmd ("checkpoint", class_obscure, detach_checkpoint_command, _("\
Detach from a checkpoint (experimental)."),
&detachlist);
- /* Info checkpoints command: list all forks/checkpoints
+ /* Info checkpoints command: list all forks/checkpoints
currently under gdb's control. */
- add_info ("checkpoints", info_forks_command,
+ add_info ("checkpoints", info_checkpoints_command,
_("IDs of currently known checkpoints."));
}
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