/* GNU/Linux native-dependent code for debugging multiple forks.
- Copyright (C) 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of GDB.
#include "regcache.h"
#include "gdbcmd.h"
#include "infcall.h"
+#include "gdb_assert.h"
#include "gdb_string.h"
#include "linux-fork.h"
+#include "linux-nat.h"
#include <sys/ptrace.h>
#include <sys/wait.h>
{
struct fork_info *fp;
- if (fork_list == NULL &&
- pid != PIDGET (inferior_ptid))
+ if (fork_list == NULL && pid != PIDGET (inferior_ptid))
{
/* Special case -- if this is the first fork in the list
(the list is hitherto empty), and if this new fork is
}
fp = XZALLOC (struct fork_info);
- fp->ptid = pid_to_ptid (pid);
+ fp->ptid = ptid_build (pid, pid, 0);
fp->num = ++highest_fork_num;
fp->next = fork_list;
fork_list = fp;
extern void nullify_last_target_wait_ptid ();
int i;
+ inferior_ptid = fp->ptid;
+
+ linux_nat_switch_fork (inferior_ptid);
+
if (fp->savedregs && fp->clobber_regs)
- regcache_cpy (current_regcache, fp->savedregs);
+ regcache_cpy (get_current_regcache (), fp->savedregs);
+ registers_changed ();
+ reinit_frame_cache ();
+
+ stop_pc = read_pc ();
nullify_last_target_wait_ptid ();
/* Now restore the file positions of open file descriptors. */
if (fp->savedregs)
regcache_xfree (fp->savedregs);
- fp->savedregs = regcache_dup (current_regcache);
+ fp->savedregs = regcache_dup (get_current_regcache ());
fp->clobber_regs = clobber_regs;
fp->pc = read_pc ();
status for it) -- however any process may be a child
or a parent, so may get a SIGCHLD from a previously
killed child. Wait them all out. */
+ struct fork_info *fp;
pid_t pid, ret;
int status;
- do {
- pid = PIDGET (fork_list->ptid);
- do {
- ptrace (PT_KILL, pid, 0, 0);
- ret = waitpid (pid, &status, 0);
- } while (ret == pid && WIFSTOPPED (status));
- delete_fork (fork_list->ptid);
- } while (fork_list != NULL);
+ for (fp = fork_list; fp; fp = fp->next)
+ {
+ pid = PIDGET (fp->ptid);
+ do {
+ ptrace (PT_KILL, pid, 0, 0);
+ ret = waitpid (pid, &status, 0);
+ /* We might get a SIGCHLD instead of an exit status. This is
+ aggravated by the first kill above - a child has just
+ died. MVS comment cut-and-pasted from linux-nat. */
+ } while (ret == pid && WIFSTOPPED (status));
+ }
+ init_fork_list (); /* Clear list, prepare to start fresh. */
}
/* The current inferior_ptid has exited, but there are other viable
We need to delete that one from the fork_list, and switch
to the next available fork. */
delete_fork (inferior_ptid);
- if (fork_list) /* Paranoia, shouldn't happen. */
- {
- inferior_ptid = fork_list[0].ptid;
- printf_filtered (_("[Switching to %s]\n"),
- target_pid_to_str (inferior_ptid));
- }
+
+ /* There should still be a fork - if there's only one left,
+ delete_fork won't remove it, because we haven't updated
+ inferior_ptid yet. */
+ gdb_assert (fork_list);
+
+ fork_load_infrun_state (fork_list);
+ printf_filtered (_("[Switching to %s]\n"),
+ target_pid_to_str (inferior_ptid));
+
+ /* If there's only one fork, switch back to non-fork mode. */
+ if (fork_list->next == NULL)
+ delete_fork (inferior_ptid);
}
/* Fork list <-> user interface. */
struct fork_info *fp;
int cur_line;
ULONGEST pc;
+ int requested = -1;
+ struct fork_info *printed = NULL;
+
+ if (arg && *arg)
+ requested = (int) parse_and_eval_long (arg);
for (fp = fork_list; fp; fp = fp->next)
{
+ if (requested > 0 && fp->num != requested)
+ continue;
+
+ printed = fp;
if (ptid_equal (fp->ptid, inferior_ptid))
{
printf_filtered ("* ");
putchar_filtered ('\n');
}
+ if (printed == NULL)
+ {
+ if (requested > 0)
+ printf_filtered (_("No fork number %d.\n"), requested);
+ else
+ printf_filtered (_("No forks.\n"));
+ }
}
/* Save/restore mode variable 'detach_fork':
error (_("No such fork/process"));
if (!oldfp)
- {
- oldfp = add_fork (ptid_get_pid (inferior_ptid));
- }
+ oldfp = add_fork (ptid_get_pid (inferior_ptid));
fork_save_infrun_state (oldfp, 1);
- inferior_ptid = newfp->ptid;
fork_load_infrun_state (newfp);
- registers_changed ();
- reinit_frame_cache ();
- stop_pc = read_pc ();
- select_frame (get_current_frame ());
printf_filtered (_("Switching to %s\n"),
target_pid_to_str (inferior_ptid));
restart <n>: restore program context from a checkpoint.\n\
Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'."));
- /* Delete-checkpoint command: kill the process and remove it from
+ /* Delete checkpoint command: kill the process and remove it from
fork list. */
- add_com ("delete-checkpoint", class_obscure, delete_fork_command, _("\
-Delete a fork/checkpoint (experimental)."));
+ add_cmd ("checkpoint", class_obscure, delete_fork_command, _("\
+Delete a fork/checkpoint (experimental)."),
+ &deletelist);
- /* Detach-checkpoint command: release the process to run independantly,
+ /* Detach checkpoint command: release the process to run independently,
and remove it from the fork list. */
- add_com ("detach-checkpoint", class_obscure, detach_fork_command, _("\
-Detach from a fork/checkpoint (experimental)."));
+ add_cmd ("checkpoint", class_obscure, detach_fork_command, _("\
+Detach from a fork/checkpoint (experimental)."),
+ &detachlist);
/* Info checkpoints command: list all forks/checkpoints
currently under gdb's control. */
/* Command aliases (let "fork" and "checkpoint" be used
interchangeably). */
- add_com_alias ("delete-fork", "delete-checkpoint", class_obscure, 1);
- add_com_alias ("detach-fork", "detach-checkpoint", class_obscure, 1);
+ add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &deletelist);
+ add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &detachlist);
add_info_alias ("forks", "checkpoints", 0);
/* "fork <n>" (by analogy to "thread <n>"). */
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