/* GNU/Linux native-dependent code for debugging multiple forks.
|
/* GNU/Linux native-dependent code for debugging multiple forks.
|
|
|
Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
|
Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
|
|
|
This file is part of GDB.
|
This file is part of GDB.
|
|
|
This program is free software; you can redistribute it and/or modify
|
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
|
it under the terms of the GNU General Public License as published by
|
the Free Software Foundation; either version 3 of the License, or
|
the Free Software Foundation; either version 3 of the License, or
|
(at your option) any later version.
|
(at your option) any later version.
|
|
|
This program is distributed in the hope that it will be useful,
|
This program is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
GNU General Public License for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
#include "defs.h"
|
#include "defs.h"
|
#include "inferior.h"
|
#include "inferior.h"
|
#include "regcache.h"
|
#include "regcache.h"
|
#include "gdbcmd.h"
|
#include "gdbcmd.h"
|
#include "infcall.h"
|
#include "infcall.h"
|
#include "gdb_assert.h"
|
#include "gdb_assert.h"
|
#include "gdb_string.h"
|
#include "gdb_string.h"
|
#include "linux-fork.h"
|
#include "linux-fork.h"
|
#include "linux-nat.h"
|
#include "linux-nat.h"
|
|
|
#include <sys/ptrace.h>
|
#include <sys/ptrace.h>
|
#include "gdb_wait.h"
|
#include "gdb_wait.h"
|
#include <sys/param.h>
|
#include <sys/param.h>
|
#include "gdb_dirent.h"
|
#include "gdb_dirent.h"
|
#include <ctype.h>
|
#include <ctype.h>
|
|
|
struct fork_info *fork_list;
|
struct fork_info *fork_list;
|
static int highest_fork_num;
|
static int highest_fork_num;
|
|
|
/* Prevent warning from -Wmissing-prototypes. */
|
/* Prevent warning from -Wmissing-prototypes. */
|
extern void _initialize_linux_fork (void);
|
extern void _initialize_linux_fork (void);
|
|
|
int detach_fork = 1; /* Default behavior is to detach
|
int detach_fork = 1; /* Default behavior is to detach
|
newly forked processes (legacy). */
|
newly forked processes (legacy). */
|
|
|
/* Fork list data structure: */
|
/* Fork list data structure: */
|
struct fork_info
|
struct fork_info
|
{
|
{
|
struct fork_info *next;
|
struct fork_info *next;
|
ptid_t ptid;
|
ptid_t ptid;
|
int num; /* Convenient handle (GDB fork id) */
|
int num; /* Convenient handle (GDB fork id) */
|
struct regcache *savedregs; /* Convenient for info fork, saves
|
struct regcache *savedregs; /* Convenient for info fork, saves
|
having to actually switch contexts. */
|
having to actually switch contexts. */
|
int clobber_regs; /* True if we should restore saved regs. */
|
int clobber_regs; /* True if we should restore saved regs. */
|
ULONGEST pc; /* PC for info fork. */
|
ULONGEST pc; /* PC for info fork. */
|
off_t *filepos; /* Set of open file descriptors' offsets. */
|
off_t *filepos; /* Set of open file descriptors' offsets. */
|
int maxfd;
|
int maxfd;
|
};
|
};
|
|
|
/* Fork list methods: */
|
/* Fork list methods: */
|
|
|
extern int
|
extern int
|
forks_exist_p (void)
|
forks_exist_p (void)
|
{
|
{
|
return (fork_list != NULL);
|
return (fork_list != NULL);
|
}
|
}
|
|
|
/* Add a fork to internal fork list.
|
/* Add a fork to internal fork list.
|
Called from linux child_follow_fork. */
|
Called from linux child_follow_fork. */
|
|
|
extern struct fork_info *
|
extern struct fork_info *
|
add_fork (pid_t pid)
|
add_fork (pid_t pid)
|
{
|
{
|
struct fork_info *fp;
|
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
|
/* Special case -- if this is the first fork in the list
|
(the list is hitherto empty), and if this new fork is
|
(the list is hitherto empty), and if this new fork is
|
NOT the current inferior_ptid, then add inferior_ptid
|
NOT the current inferior_ptid, then add inferior_ptid
|
first, as a special zeroeth fork id. */
|
first, as a special zeroeth fork id. */
|
highest_fork_num = -1;
|
highest_fork_num = -1;
|
add_fork (PIDGET (inferior_ptid)); /* safe recursion */
|
add_fork (PIDGET (inferior_ptid)); /* safe recursion */
|
}
|
}
|
|
|
fp = XZALLOC (struct fork_info);
|
fp = XZALLOC (struct fork_info);
|
fp->ptid = ptid_build (pid, pid, 0);
|
fp->ptid = ptid_build (pid, pid, 0);
|
fp->num = ++highest_fork_num;
|
fp->num = ++highest_fork_num;
|
fp->next = fork_list;
|
fp->next = fork_list;
|
fork_list = fp;
|
fork_list = fp;
|
return fp;
|
return fp;
|
}
|
}
|
|
|
static void
|
static void
|
free_fork (struct fork_info *fp)
|
free_fork (struct fork_info *fp)
|
{
|
{
|
/* Notes on step-resume breakpoints: since this is a concern for
|
/* Notes on step-resume breakpoints: since this is a concern for
|
threads, let's convince ourselves that it's not a concern for
|
threads, let's convince ourselves that it's not a concern for
|
forks. There are two ways for a fork_info to be created. First,
|
forks. There are two ways for a fork_info to be created. First,
|
by the checkpoint command, in which case we're at a gdb prompt
|
by the checkpoint command, in which case we're at a gdb prompt
|
and there can't be any step-resume breakpoint. Second, by a fork
|
and there can't be any step-resume breakpoint. Second, by a fork
|
in the user program, in which case we *may* have stepped into the
|
in the user program, in which case we *may* have stepped into the
|
fork call, but regardless of whether we follow the parent or the
|
fork call, but regardless of whether we follow the parent or the
|
child, we will return to the same place and the step-resume
|
child, we will return to the same place and the step-resume
|
breakpoint, if any, will take care of itself as usual. And
|
breakpoint, if any, will take care of itself as usual. And
|
unlike threads, we do not save a private copy of the step-resume
|
unlike threads, we do not save a private copy of the step-resume
|
breakpoint -- so we're OK. */
|
breakpoint -- so we're OK. */
|
|
|
if (fp)
|
if (fp)
|
{
|
{
|
if (fp->savedregs)
|
if (fp->savedregs)
|
regcache_xfree (fp->savedregs);
|
regcache_xfree (fp->savedregs);
|
if (fp->filepos)
|
if (fp->filepos)
|
xfree (fp->filepos);
|
xfree (fp->filepos);
|
xfree (fp);
|
xfree (fp);
|
}
|
}
|
}
|
}
|
|
|
static void
|
static void
|
delete_fork (ptid_t ptid)
|
delete_fork (ptid_t ptid)
|
{
|
{
|
struct fork_info *fp, *fpprev;
|
struct fork_info *fp, *fpprev;
|
|
|
fpprev = NULL;
|
fpprev = NULL;
|
|
|
for (fp = fork_list; fp; fpprev = fp, fp = fp->next)
|
for (fp = fork_list; fp; fpprev = fp, fp = fp->next)
|
if (ptid_equal (fp->ptid, ptid))
|
if (ptid_equal (fp->ptid, ptid))
|
break;
|
break;
|
|
|
if (!fp)
|
if (!fp)
|
return;
|
return;
|
|
|
if (fpprev)
|
if (fpprev)
|
fpprev->next = fp->next;
|
fpprev->next = fp->next;
|
else
|
else
|
fork_list = fp->next;
|
fork_list = fp->next;
|
|
|
free_fork (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
|
and if it is (hopefully!) the current inferior_ptid, then
|
remove it, leaving the list empty -- we're now down to the
|
remove it, leaving the list empty -- we're now down to the
|
default case of debugging a single process. */
|
default case of debugging a single process. */
|
if (fork_list != NULL && fork_list->next == NULL &&
|
if (fork_list != NULL && fork_list->next == NULL &&
|
ptid_equal (fork_list->ptid, inferior_ptid))
|
ptid_equal (fork_list->ptid, inferior_ptid))
|
{
|
{
|
/* Last fork -- delete from list and handle as solo process
|
/* Last fork -- delete from list and handle as solo process
|
(should be a safe recursion). */
|
(should be a safe recursion). */
|
delete_fork (inferior_ptid);
|
delete_fork (inferior_ptid);
|
}
|
}
|
}
|
}
|
|
|
/* Find a fork_info by matching PTID. */
|
/* Find a fork_info by matching PTID. */
|
static struct fork_info *
|
static struct fork_info *
|
find_fork_ptid (ptid_t ptid)
|
find_fork_ptid (ptid_t ptid)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
|
|
for (fp = fork_list; fp; fp = fp->next)
|
for (fp = fork_list; fp; fp = fp->next)
|
if (ptid_equal (fp->ptid, ptid))
|
if (ptid_equal (fp->ptid, ptid))
|
return fp;
|
return fp;
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Find a fork_info by matching ID. */
|
/* Find a fork_info by matching ID. */
|
static struct fork_info *
|
static struct fork_info *
|
find_fork_id (int num)
|
find_fork_id (int num)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
|
|
for (fp = fork_list; fp; fp = fp->next)
|
for (fp = fork_list; fp; fp = fp->next)
|
if (fp->num == num)
|
if (fp->num == num)
|
return fp;
|
return fp;
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Find a fork_info by matching pid. */
|
/* Find a fork_info by matching pid. */
|
extern struct fork_info *
|
extern struct fork_info *
|
find_fork_pid (pid_t pid)
|
find_fork_pid (pid_t pid)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
|
|
for (fp = fork_list; fp; fp = fp->next)
|
for (fp = fork_list; fp; fp = fp->next)
|
if (pid == ptid_get_pid (fp->ptid))
|
if (pid == ptid_get_pid (fp->ptid))
|
return fp;
|
return fp;
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
static ptid_t
|
static ptid_t
|
fork_id_to_ptid (int num)
|
fork_id_to_ptid (int num)
|
{
|
{
|
struct fork_info *fork = find_fork_id (num);
|
struct fork_info *fork = find_fork_id (num);
|
if (fork)
|
if (fork)
|
return fork->ptid;
|
return fork->ptid;
|
else
|
else
|
return pid_to_ptid (-1);
|
return pid_to_ptid (-1);
|
}
|
}
|
|
|
static void
|
static void
|
init_fork_list (void)
|
init_fork_list (void)
|
{
|
{
|
struct fork_info *fp, *fpnext;
|
struct fork_info *fp, *fpnext;
|
|
|
if (!fork_list)
|
if (!fork_list)
|
return;
|
return;
|
|
|
for (fp = fork_list; fp; fp = fpnext)
|
for (fp = fork_list; fp; fp = fpnext)
|
{
|
{
|
fpnext = fp->next;
|
fpnext = fp->next;
|
free_fork (fp);
|
free_fork (fp);
|
}
|
}
|
|
|
fork_list = NULL;
|
fork_list = NULL;
|
}
|
}
|
|
|
/* Fork list <-> gdb interface. */
|
/* 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. */
|
Calls lseek in the (current) inferior process. */
|
|
|
static off_t
|
static off_t
|
call_lseek (int fd, off_t offset, int whence)
|
call_lseek (int fd, off_t offset, int whence)
|
{
|
{
|
char exp[80];
|
char exp[80];
|
|
|
snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)",
|
snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)",
|
fd, (long) offset, whence);
|
fd, (long) offset, whence);
|
return (off_t) parse_and_eval_long (&exp[0]);
|
return (off_t) parse_and_eval_long (&exp[0]);
|
}
|
}
|
|
|
/* Load infrun state for the fork PTID. */
|
/* Load infrun state for the fork PTID. */
|
|
|
static void
|
static void
|
fork_load_infrun_state (struct fork_info *fp)
|
fork_load_infrun_state (struct fork_info *fp)
|
{
|
{
|
extern void nullify_last_target_wait_ptid ();
|
extern void nullify_last_target_wait_ptid ();
|
int i;
|
int i;
|
|
|
inferior_ptid = fp->ptid;
|
inferior_ptid = fp->ptid;
|
|
|
linux_nat_switch_fork (inferior_ptid);
|
linux_nat_switch_fork (inferior_ptid);
|
|
|
if (fp->savedregs && fp->clobber_regs)
|
if (fp->savedregs && fp->clobber_regs)
|
regcache_cpy (get_current_regcache (), fp->savedregs);
|
regcache_cpy (get_current_regcache (), fp->savedregs);
|
|
|
registers_changed ();
|
registers_changed ();
|
reinit_frame_cache ();
|
reinit_frame_cache ();
|
|
|
stop_pc = read_pc ();
|
stop_pc = read_pc ();
|
nullify_last_target_wait_ptid ();
|
nullify_last_target_wait_ptid ();
|
|
|
/* Now restore the file positions of open file descriptors. */
|
/* Now restore the file positions of open file descriptors. */
|
if (fp->filepos)
|
if (fp->filepos)
|
{
|
{
|
for (i = 0; i <= fp->maxfd; i++)
|
for (i = 0; i <= fp->maxfd; i++)
|
if (fp->filepos[i] != (off_t) -1)
|
if (fp->filepos[i] != (off_t) -1)
|
call_lseek (i, fp->filepos[i], SEEK_SET);
|
call_lseek (i, fp->filepos[i], SEEK_SET);
|
/* NOTE: I can get away with using SEEK_SET and SEEK_CUR because
|
/* NOTE: I can get away with using SEEK_SET and SEEK_CUR because
|
this is native-only. If it ever has to be cross, we'll have
|
this is native-only. If it ever has to be cross, we'll have
|
to rethink this. */
|
to rethink this. */
|
}
|
}
|
}
|
}
|
|
|
/* Save infrun state for the fork PTID.
|
/* Save infrun state for the fork PTID.
|
Exported for use by linux child_follow_fork. */
|
Exported for use by linux child_follow_fork. */
|
|
|
extern void
|
extern void
|
fork_save_infrun_state (struct fork_info *fp, int clobber_regs)
|
fork_save_infrun_state (struct fork_info *fp, int clobber_regs)
|
{
|
{
|
char path[MAXPATHLEN];
|
char path[MAXPATHLEN];
|
struct dirent *de;
|
struct dirent *de;
|
DIR *d;
|
DIR *d;
|
|
|
if (fp->savedregs)
|
if (fp->savedregs)
|
regcache_xfree (fp->savedregs);
|
regcache_xfree (fp->savedregs);
|
|
|
fp->savedregs = regcache_dup (get_current_regcache ());
|
fp->savedregs = regcache_dup (get_current_regcache ());
|
fp->clobber_regs = clobber_regs;
|
fp->clobber_regs = clobber_regs;
|
fp->pc = read_pc ();
|
fp->pc = read_pc ();
|
|
|
if (clobber_regs)
|
if (clobber_regs)
|
{
|
{
|
/* Now save the 'state' (file position) of all open file descriptors.
|
/* Now save the 'state' (file position) of all open file descriptors.
|
Unfortunately fork does not take care of that for us... */
|
Unfortunately fork does not take care of that for us... */
|
snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid));
|
snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid));
|
if ((d = opendir (path)) != NULL)
|
if ((d = opendir (path)) != NULL)
|
{
|
{
|
long tmp;
|
long tmp;
|
|
|
fp->maxfd = 0;
|
fp->maxfd = 0;
|
while ((de = readdir (d)) != NULL)
|
while ((de = readdir (d)) != NULL)
|
{
|
{
|
/* Count open file descriptors (actually find highest
|
/* Count open file descriptors (actually find highest
|
numbered). */
|
numbered). */
|
tmp = strtol (&de->d_name[0], NULL, 10);
|
tmp = strtol (&de->d_name[0], NULL, 10);
|
if (fp->maxfd < tmp)
|
if (fp->maxfd < tmp)
|
fp->maxfd = tmp;
|
fp->maxfd = tmp;
|
}
|
}
|
/* Allocate array of file positions. */
|
/* Allocate array of file positions. */
|
fp->filepos = xrealloc (fp->filepos,
|
fp->filepos = xrealloc (fp->filepos,
|
(fp->maxfd + 1) * sizeof (*fp->filepos));
|
(fp->maxfd + 1) * sizeof (*fp->filepos));
|
|
|
/* Initialize to -1 (invalid). */
|
/* Initialize to -1 (invalid). */
|
for (tmp = 0; tmp <= fp->maxfd; tmp++)
|
for (tmp = 0; tmp <= fp->maxfd; tmp++)
|
fp->filepos[tmp] = -1;
|
fp->filepos[tmp] = -1;
|
|
|
/* Now find actual file positions. */
|
/* Now find actual file positions. */
|
rewinddir (d);
|
rewinddir (d);
|
while ((de = readdir (d)) != NULL)
|
while ((de = readdir (d)) != NULL)
|
if (isdigit (de->d_name[0]))
|
if (isdigit (de->d_name[0]))
|
{
|
{
|
tmp = strtol (&de->d_name[0], NULL, 10);
|
tmp = strtol (&de->d_name[0], NULL, 10);
|
fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR);
|
fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR);
|
}
|
}
|
closedir (d);
|
closedir (d);
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Kill 'em all, let God sort 'em out... */
|
/* Kill 'em all, let God sort 'em out... */
|
|
|
extern void
|
extern void
|
linux_fork_killall (void)
|
linux_fork_killall (void)
|
{
|
{
|
/* Walk list and kill every pid. No need to treat the
|
/* Walk list and kill every pid. No need to treat the
|
current inferior_ptid as special (we do not return a
|
current inferior_ptid as special (we do not return a
|
status for it) -- however any process may be a child
|
status for it) -- however any process may be a child
|
or a parent, so may get a SIGCHLD from a previously
|
or a parent, so may get a SIGCHLD from a previously
|
killed child. Wait them all out. */
|
killed child. Wait them all out. */
|
struct fork_info *fp;
|
struct fork_info *fp;
|
pid_t pid, ret;
|
pid_t pid, ret;
|
int status;
|
int status;
|
|
|
for (fp = fork_list; fp; fp = fp->next)
|
for (fp = fork_list; fp; fp = fp->next)
|
{
|
{
|
pid = PIDGET (fp->ptid);
|
pid = PIDGET (fp->ptid);
|
do {
|
do {
|
ptrace (PT_KILL, pid, 0, 0);
|
ptrace (PT_KILL, pid, 0, 0);
|
ret = waitpid (pid, &status, 0);
|
ret = waitpid (pid, &status, 0);
|
/* We might get a SIGCHLD instead of an exit status. This is
|
/* We might get a SIGCHLD instead of an exit status. This is
|
aggravated by the first kill above - a child has just
|
aggravated by the first kill above - a child has just
|
died. MVS comment cut-and-pasted from linux-nat. */
|
died. MVS comment cut-and-pasted from linux-nat. */
|
} while (ret == pid && WIFSTOPPED (status));
|
} while (ret == pid && WIFSTOPPED (status));
|
}
|
}
|
init_fork_list (); /* Clear list, prepare to start fresh. */
|
init_fork_list (); /* Clear list, prepare to start fresh. */
|
}
|
}
|
|
|
/* The current inferior_ptid has exited, but there are other viable
|
/* The current inferior_ptid has exited, but there are other viable
|
forks to debug. Delete the exiting one and context-switch to the
|
forks to debug. Delete the exiting one and context-switch to the
|
first available. */
|
first available. */
|
|
|
extern void
|
extern void
|
linux_fork_mourn_inferior (void)
|
linux_fork_mourn_inferior (void)
|
{
|
{
|
/* Wait just one more time to collect the inferior's exit status.
|
/* Wait just one more time to collect the inferior's exit status.
|
Do not check whether this succeeds though, since we may be
|
Do not check whether this succeeds though, since we may be
|
dealing with a process that we attached to. Such a process will
|
dealing with a process that we attached to. Such a process will
|
only report its exit status to its original parent. */
|
only report its exit status to its original parent. */
|
int status;
|
int status;
|
|
|
waitpid (ptid_get_pid (inferior_ptid), &status, 0);
|
waitpid (ptid_get_pid (inferior_ptid), &status, 0);
|
|
|
/* OK, presumably inferior_ptid is the one who has exited.
|
/* OK, presumably inferior_ptid is the one who has exited.
|
We need to delete that one from the fork_list, and switch
|
We need to delete that one from the fork_list, and switch
|
to the next available fork. */
|
to the next available fork. */
|
delete_fork (inferior_ptid);
|
delete_fork (inferior_ptid);
|
|
|
/* There should still be a fork - if there's only one left,
|
/* There should still be a fork - if there's only one left,
|
delete_fork won't remove it, because we haven't updated
|
delete_fork won't remove it, because we haven't updated
|
inferior_ptid yet. */
|
inferior_ptid yet. */
|
gdb_assert (fork_list);
|
gdb_assert (fork_list);
|
|
|
fork_load_infrun_state (fork_list);
|
fork_load_infrun_state (fork_list);
|
printf_filtered (_("[Switching to %s]\n"),
|
printf_filtered (_("[Switching to %s]\n"),
|
target_pid_to_str (inferior_ptid));
|
target_pid_to_str (inferior_ptid));
|
|
|
/* If there's only one fork, switch back to non-fork mode. */
|
/* If there's only one fork, switch back to non-fork mode. */
|
if (fork_list->next == NULL)
|
if (fork_list->next == NULL)
|
delete_fork (inferior_ptid);
|
delete_fork (inferior_ptid);
|
}
|
}
|
|
|
/* Fork list <-> user interface. */
|
/* Fork list <-> user interface. */
|
|
|
static void
|
static void
|
delete_fork_command (char *args, int from_tty)
|
delete_fork_command (char *args, int from_tty)
|
{
|
{
|
ptid_t ptid;
|
ptid_t ptid;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (fork/checkpoint id to delete)"));
|
error (_("Requires argument (fork/checkpoint id to delete)"));
|
|
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
if (ptid_equal (ptid, minus_one_ptid))
|
if (ptid_equal (ptid, minus_one_ptid))
|
error (_("No such fork/checkpoint id, %s"), args);
|
error (_("No such fork/checkpoint id, %s"), args);
|
|
|
if (ptid_equal (ptid, inferior_ptid))
|
if (ptid_equal (ptid, inferior_ptid))
|
error (_("Please switch to another fork/checkpoint before deleting the current one"));
|
error (_("Please switch to another fork/checkpoint before deleting the current one"));
|
|
|
if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0))
|
if (ptrace (PTRACE_KILL, PIDGET (ptid), 0, 0))
|
error (_("Unable to kill pid %s"), target_tid_to_str (ptid));
|
error (_("Unable to kill pid %s"), target_tid_to_str (ptid));
|
|
|
if (from_tty)
|
if (from_tty)
|
printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid));
|
printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid));
|
|
|
delete_fork (ptid);
|
delete_fork (ptid);
|
}
|
}
|
|
|
static void
|
static void
|
detach_fork_command (char *args, int from_tty)
|
detach_fork_command (char *args, int from_tty)
|
{
|
{
|
ptid_t ptid;
|
ptid_t ptid;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (fork id to detach)"));
|
error (_("Requires argument (fork id to detach)"));
|
|
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
ptid = fork_id_to_ptid (parse_and_eval_long (args));
|
if (ptid_equal (ptid, minus_one_ptid))
|
if (ptid_equal (ptid, minus_one_ptid))
|
error (_("No such fork id, %s"), args);
|
error (_("No such fork id, %s"), args);
|
|
|
if (ptid_equal (ptid, inferior_ptid))
|
if (ptid_equal (ptid, inferior_ptid))
|
error (_("Please switch to another fork before detaching the current one"));
|
error (_("Please switch to another fork before detaching the current one"));
|
|
|
if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0))
|
if (ptrace (PTRACE_DETACH, PIDGET (ptid), 0, 0))
|
error (_("Unable to detach %s"), target_pid_to_str (ptid));
|
error (_("Unable to detach %s"), target_pid_to_str (ptid));
|
|
|
if (from_tty)
|
if (from_tty)
|
printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid));
|
printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid));
|
|
|
delete_fork (ptid);
|
delete_fork (ptid);
|
}
|
}
|
|
|
/* Print information about currently known forks. */
|
/* Print information about currently known forks. */
|
|
|
static void
|
static void
|
info_forks_command (char *arg, int from_tty)
|
info_forks_command (char *arg, int from_tty)
|
{
|
{
|
struct frame_info *cur_frame;
|
struct frame_info *cur_frame;
|
struct symtab_and_line sal;
|
struct symtab_and_line sal;
|
struct symtab *cur_symtab;
|
struct symtab *cur_symtab;
|
struct fork_info *fp;
|
struct fork_info *fp;
|
int cur_line;
|
int cur_line;
|
ULONGEST pc;
|
ULONGEST pc;
|
int requested = -1;
|
int requested = -1;
|
struct fork_info *printed = NULL;
|
struct fork_info *printed = NULL;
|
|
|
if (arg && *arg)
|
if (arg && *arg)
|
requested = (int) parse_and_eval_long (arg);
|
requested = (int) parse_and_eval_long (arg);
|
|
|
for (fp = fork_list; fp; fp = fp->next)
|
for (fp = fork_list; fp; fp = fp->next)
|
{
|
{
|
if (requested > 0 && fp->num != requested)
|
if (requested > 0 && fp->num != requested)
|
continue;
|
continue;
|
|
|
printed = fp;
|
printed = fp;
|
if (ptid_equal (fp->ptid, inferior_ptid))
|
if (ptid_equal (fp->ptid, inferior_ptid))
|
{
|
{
|
printf_filtered ("* ");
|
printf_filtered ("* ");
|
pc = read_pc ();
|
pc = read_pc ();
|
}
|
}
|
else
|
else
|
{
|
{
|
printf_filtered (" ");
|
printf_filtered (" ");
|
pc = fp->pc;
|
pc = fp->pc;
|
}
|
}
|
printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid));
|
printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid));
|
if (fp->num == 0)
|
if (fp->num == 0)
|
printf_filtered (_(" (main process)"));
|
printf_filtered (_(" (main process)"));
|
printf_filtered (_(" at "));
|
printf_filtered (_(" at "));
|
fputs_filtered (paddress (pc), gdb_stdout);
|
fputs_filtered (paddress (pc), gdb_stdout);
|
|
|
sal = find_pc_line (pc, 0);
|
sal = find_pc_line (pc, 0);
|
if (sal.symtab)
|
if (sal.symtab)
|
{
|
{
|
char *tmp = strrchr (sal.symtab->filename, '/');
|
char *tmp = strrchr (sal.symtab->filename, '/');
|
|
|
if (tmp)
|
if (tmp)
|
printf_filtered (_(", file %s"), tmp + 1);
|
printf_filtered (_(", file %s"), tmp + 1);
|
else
|
else
|
printf_filtered (_(", file %s"), sal.symtab->filename);
|
printf_filtered (_(", file %s"), sal.symtab->filename);
|
}
|
}
|
if (sal.line)
|
if (sal.line)
|
printf_filtered (_(", line %d"), sal.line);
|
printf_filtered (_(", line %d"), sal.line);
|
if (!sal.symtab && !sal.line)
|
if (!sal.symtab && !sal.line)
|
{
|
{
|
struct minimal_symbol *msym;
|
struct minimal_symbol *msym;
|
|
|
msym = lookup_minimal_symbol_by_pc (pc);
|
msym = lookup_minimal_symbol_by_pc (pc);
|
if (msym)
|
if (msym)
|
printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym));
|
printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym));
|
}
|
}
|
|
|
putchar_filtered ('\n');
|
putchar_filtered ('\n');
|
}
|
}
|
if (printed == NULL)
|
if (printed == NULL)
|
{
|
{
|
if (requested > 0)
|
if (requested > 0)
|
printf_filtered (_("No fork number %d.\n"), requested);
|
printf_filtered (_("No fork number %d.\n"), requested);
|
else
|
else
|
printf_filtered (_("No forks.\n"));
|
printf_filtered (_("No forks.\n"));
|
}
|
}
|
}
|
}
|
|
|
/* Save/restore mode variable 'detach_fork':
|
/* Save/restore mode variable 'detach_fork':
|
We need to temporarily take over this mode variable, while
|
We need to temporarily take over this mode variable, while
|
preserving the user-specified state, and make sure that it
|
preserving the user-specified state, and make sure that it
|
gets restored in case of error.
|
gets restored in case of error.
|
|
|
The int pointer that we use comes from the caller, so we can
|
The int pointer that we use comes from the caller, so we can
|
be called more than once (even though currently we don't need to). */
|
be called more than once (even though currently we don't need to). */
|
|
|
static void
|
static void
|
restore_detach_fork (void *arg)
|
restore_detach_fork (void *arg)
|
{
|
{
|
detach_fork = *(int *) arg;
|
detach_fork = *(int *) arg;
|
}
|
}
|
|
|
static struct cleanup *
|
static struct cleanup *
|
save_detach_fork (int *saved_val)
|
save_detach_fork (int *saved_val)
|
{
|
{
|
*saved_val = detach_fork;
|
*saved_val = detach_fork;
|
return make_cleanup (restore_detach_fork, (void *) saved_val);
|
return make_cleanup (restore_detach_fork, (void *) saved_val);
|
}
|
}
|
|
|
static void
|
static void
|
checkpoint_command (char *args, int from_tty)
|
checkpoint_command (char *args, int from_tty)
|
{
|
{
|
struct target_waitstatus last_target_waitstatus;
|
struct target_waitstatus last_target_waitstatus;
|
ptid_t last_target_ptid;
|
ptid_t last_target_ptid;
|
struct value *fork_fn = NULL, *ret;
|
struct value *fork_fn = NULL, *ret;
|
struct fork_info *fp;
|
struct fork_info *fp;
|
pid_t retpid;
|
pid_t retpid;
|
struct cleanup *old_chain;
|
struct cleanup *old_chain;
|
long i;
|
long i;
|
/* Make this temp var static, 'cause it's used in the error context. */
|
/* Make this temp var static, 'cause it's used in the error context. */
|
static int temp_detach_fork;
|
static int temp_detach_fork;
|
|
|
/* Make the inferior fork, record its (and gdb's) state. */
|
/* Make the inferior fork, record its (and gdb's) state. */
|
|
|
if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL)
|
if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL)
|
fork_fn = find_function_in_inferior ("fork");
|
fork_fn = find_function_in_inferior ("fork");
|
if (!fork_fn)
|
if (!fork_fn)
|
if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL)
|
if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL)
|
fork_fn = find_function_in_inferior ("fork");
|
fork_fn = find_function_in_inferior ("fork");
|
if (!fork_fn)
|
if (!fork_fn)
|
error (_("checkpoint: can't find fork function in inferior."));
|
error (_("checkpoint: can't find fork function in inferior."));
|
|
|
ret = value_from_longest (builtin_type_int, 0);
|
ret = value_from_longest (builtin_type_int, 0);
|
old_chain = save_detach_fork (&temp_detach_fork);
|
old_chain = save_detach_fork (&temp_detach_fork);
|
detach_fork = 0;
|
detach_fork = 0;
|
ret = call_function_by_hand (fork_fn, 0, &ret);
|
ret = call_function_by_hand (fork_fn, 0, &ret);
|
do_cleanups (old_chain);
|
do_cleanups (old_chain);
|
if (!ret) /* Probably can't happen. */
|
if (!ret) /* Probably can't happen. */
|
error (_("checkpoint: call_function_by_hand returned null."));
|
error (_("checkpoint: call_function_by_hand returned null."));
|
|
|
retpid = value_as_long (ret);
|
retpid = value_as_long (ret);
|
get_last_target_status (&last_target_ptid, &last_target_waitstatus);
|
get_last_target_status (&last_target_ptid, &last_target_waitstatus);
|
if (from_tty)
|
if (from_tty)
|
{
|
{
|
int parent_pid;
|
int parent_pid;
|
|
|
printf_filtered (_("checkpoint: fork returned pid %ld.\n"),
|
printf_filtered (_("checkpoint: fork returned pid %ld.\n"),
|
(long) retpid);
|
(long) retpid);
|
if (info_verbose)
|
if (info_verbose)
|
{
|
{
|
parent_pid = ptid_get_lwp (last_target_ptid);
|
parent_pid = ptid_get_lwp (last_target_ptid);
|
if (parent_pid == 0)
|
if (parent_pid == 0)
|
parent_pid = ptid_get_pid (last_target_ptid);
|
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);
|
(long) parent_pid);
|
}
|
}
|
}
|
}
|
|
|
fp = find_fork_pid (retpid);
|
fp = find_fork_pid (retpid);
|
if (!fp)
|
if (!fp)
|
error (_("Failed to find new fork"));
|
error (_("Failed to find new fork"));
|
fork_save_infrun_state (fp, 1);
|
fork_save_infrun_state (fp, 1);
|
}
|
}
|
|
|
static void
|
static void
|
linux_fork_context (struct fork_info *newfp, int from_tty)
|
linux_fork_context (struct fork_info *newfp, int from_tty)
|
{
|
{
|
/* Now we attempt to switch processes. */
|
/* Now we attempt to switch processes. */
|
struct fork_info *oldfp = find_fork_ptid (inferior_ptid);
|
struct fork_info *oldfp = find_fork_ptid (inferior_ptid);
|
ptid_t ptid;
|
ptid_t ptid;
|
int id, i;
|
int id, i;
|
|
|
if (!newfp)
|
if (!newfp)
|
error (_("No such fork/process"));
|
error (_("No such fork/process"));
|
|
|
if (!oldfp)
|
if (!oldfp)
|
oldfp = add_fork (ptid_get_pid (inferior_ptid));
|
oldfp = add_fork (ptid_get_pid (inferior_ptid));
|
|
|
fork_save_infrun_state (oldfp, 1);
|
fork_save_infrun_state (oldfp, 1);
|
fork_load_infrun_state (newfp);
|
fork_load_infrun_state (newfp);
|
|
|
printf_filtered (_("Switching to %s\n"),
|
printf_filtered (_("Switching to %s\n"),
|
target_pid_to_str (inferior_ptid));
|
target_pid_to_str (inferior_ptid));
|
|
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
|
}
|
}
|
|
|
/* Switch inferior process (fork) context, by process id. */
|
/* Switch inferior process (fork) context, by process id. */
|
static void
|
static void
|
process_command (char *args, int from_tty)
|
process_command (char *args, int from_tty)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (process id to switch to)"));
|
error (_("Requires argument (process id to switch to)"));
|
|
|
if ((fp = find_fork_pid (parse_and_eval_long (args))) == NULL)
|
if ((fp = find_fork_pid (parse_and_eval_long (args))) == NULL)
|
error (_("Not found: process id %s"), args);
|
error (_("Not found: process id %s"), args);
|
|
|
linux_fork_context (fp, from_tty);
|
linux_fork_context (fp, from_tty);
|
}
|
}
|
|
|
/* Switch inferior process (fork) context, by fork id. */
|
/* Switch inferior process (fork) context, by fork id. */
|
static void
|
static void
|
fork_command (char *args, int from_tty)
|
fork_command (char *args, int from_tty)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (fork id to switch to)"));
|
error (_("Requires argument (fork id to switch to)"));
|
|
|
if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
|
if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
|
error (_("Not found: fork id %s"), args);
|
error (_("Not found: fork id %s"), args);
|
|
|
linux_fork_context (fp, from_tty);
|
linux_fork_context (fp, from_tty);
|
}
|
}
|
|
|
/* Switch inferior process (fork) context, by checkpoint id. */
|
/* Switch inferior process (fork) context, by checkpoint id. */
|
static void
|
static void
|
restart_command (char *args, int from_tty)
|
restart_command (char *args, int from_tty)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
|
|
if (!args || !*args)
|
if (!args || !*args)
|
error (_("Requires argument (checkpoint id to restart)"));
|
error (_("Requires argument (checkpoint id to restart)"));
|
|
|
if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
|
if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
|
error (_("Not found: checkpoint id %s"), args);
|
error (_("Not found: checkpoint id %s"), args);
|
|
|
linux_fork_context (fp, from_tty);
|
linux_fork_context (fp, from_tty);
|
}
|
}
|
|
|
void
|
void
|
_initialize_linux_fork (void)
|
_initialize_linux_fork (void)
|
{
|
{
|
init_fork_list ();
|
init_fork_list ();
|
|
|
/* Set/show detach-on-fork: user-settable mode. */
|
/* Set/show detach-on-fork: user-settable mode. */
|
|
|
add_setshow_boolean_cmd ("detach-on-fork", class_obscure, &detach_fork, _("\
|
add_setshow_boolean_cmd ("detach-on-fork", class_obscure, &detach_fork, _("\
|
Set whether gdb will detach the child of a fork."), _("\
|
Set whether gdb will detach the child of a fork."), _("\
|
Show 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."),
|
Tells gdb whether to detach the child of a fork."),
|
NULL, NULL, &setlist, &showlist);
|
NULL, NULL, &setlist, &showlist);
|
|
|
/* Set/show restart-auto-finish: user-settable count. Causes the
|
/* Set/show restart-auto-finish: user-settable count. Causes the
|
first "restart" of a fork to do some number of "finish" commands
|
first "restart" of a fork to do some number of "finish" commands
|
before returning to user.
|
before returning to user.
|
|
|
Useful because otherwise the virgin fork process will be stopped
|
Useful because otherwise the virgin fork process will be stopped
|
somewhere in the un-interesting fork system call. */
|
somewhere in the un-interesting fork system call. */
|
|
|
/* Checkpoint command: create a fork of the inferior process
|
/* Checkpoint command: create a fork of the inferior process
|
and set it aside for later debugging. */
|
and set it aside for later debugging. */
|
|
|
add_com ("checkpoint", class_obscure, checkpoint_command, _("\
|
add_com ("checkpoint", class_obscure, checkpoint_command, _("\
|
Fork a duplicate process (experimental)."));
|
Fork a duplicate process (experimental)."));
|
|
|
/* Restart command: restore the context of a specified fork
|
/* Restart command: restore the context of a specified fork
|
process. May be used for "program forks" as well as for
|
process. May be used for "program forks" as well as for
|
"debugger forks" (checkpoints). */
|
"debugger forks" (checkpoints). */
|
|
|
add_com ("restart", class_obscure, restart_command, _("\
|
add_com ("restart", class_obscure, restart_command, _("\
|
restart <n>: restore program context from a checkpoint.\n\
|
restart <n>: restore program context from a checkpoint.\n\
|
Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'."));
|
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. */
|
fork list. */
|
|
|
add_cmd ("checkpoint", class_obscure, delete_fork_command, _("\
|
add_cmd ("checkpoint", class_obscure, delete_fork_command, _("\
|
Delete a fork/checkpoint (experimental)."),
|
Delete a fork/checkpoint (experimental)."),
|
&deletelist);
|
&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. */
|
and remove it from the fork list. */
|
|
|
add_cmd ("checkpoint", class_obscure, detach_fork_command, _("\
|
add_cmd ("checkpoint", class_obscure, detach_fork_command, _("\
|
Detach from a fork/checkpoint (experimental)."),
|
Detach from a fork/checkpoint (experimental)."),
|
&detachlist);
|
&detachlist);
|
|
|
/* Info checkpoints command: list all forks/checkpoints
|
/* Info checkpoints command: list all forks/checkpoints
|
currently under gdb's control. */
|
currently under gdb's control. */
|
|
|
add_info ("checkpoints", info_forks_command,
|
add_info ("checkpoints", info_forks_command,
|
_("IDs of currently known forks/checkpoints."));
|
_("IDs of currently known forks/checkpoints."));
|
|
|
/* Command aliases (let "fork" and "checkpoint" be used
|
/* Command aliases (let "fork" and "checkpoint" be used
|
interchangeably). */
|
interchangeably). */
|
|
|
add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &deletelist);
|
add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &deletelist);
|
add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &detachlist);
|
add_alias_cmd ("fork", "checkpoint", class_obscure, 1, &detachlist);
|
add_info_alias ("forks", "checkpoints", 0);
|
add_info_alias ("forks", "checkpoints", 0);
|
|
|
/* "fork <n>" (by analogy to "thread <n>"). */
|
/* "fork <n>" (by analogy to "thread <n>"). */
|
add_com ("fork", class_obscure, fork_command, _("\
|
add_com ("fork", class_obscure, fork_command, _("\
|
fork <n>: Switch between forked processes.\n\
|
fork <n>: Switch between forked processes.\n\
|
Argument 'n' is fork ID, as displayed by 'info forks'."));
|
Argument 'n' is fork ID, as displayed by 'info forks'."));
|
|
|
/* "process <proc id>" as opposed to "fork <fork id>". */
|
/* "process <proc id>" as opposed to "fork <fork id>". */
|
add_com ("process", class_obscure, process_command, _("\
|
add_com ("process", class_obscure, process_command, _("\
|
process <pid>: Switch between forked processes.\n\
|
process <pid>: Switch between forked processes.\n\
|
Argument 'pid' is process ID, as displayed by 'info forks' or 'shell ps'."));
|
Argument 'pid' is process ID, as displayed by 'info forks' or 'shell ps'."));
|
}
|
}
|
|
|
