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* inf-ttrace.c (inf_ttrace_vfork_ppid): New variable.

Browse source 
(inf_ttrace_follow_fork): New function.
(inf_ttrace_him, inf_ttrace_attach): Ask for TTEVT_FORK and
TTEVT_VFORK events.  Replace TTEO_NOSTRCHLD option with
TTEO_PROC_INHERIT.
(inf_ttrace_create_inferior, inf_ttrace_attach): Add checks for
inf_ttrace_vfork_ppid.
(inf_ttrace_kill_inferior, inf_ttrace_detach): Detach from waiting
parent if appropriate.
(inf_ttrace_wait): Handle TTEVT_FORK and TTEVT_VFORK.
(inf_ttrace_target): Set to_follow_fork.
This commit is contained in:
Mark Kettenis 2005-07-20 13:25:28 +00:00
parent 157e7bd196
commit b2a4db28c2
2 changed files with 207 additions and 6 deletions
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14
gdb/ChangeLog
View file

@ -1,3 +1,17 @@
2005-07-20 Mark Kettenis <kettenis@gnu.org>
* inf-ttrace.c (inf_ttrace_vfork_ppid): New variable.
(inf_ttrace_follow_fork): New function.
(inf_ttrace_him, inf_ttrace_attach): Ask for TTEVT_FORK and
TTEVT_VFORK events. Replace TTEO_NOSTRCHLD option with
TTEO_PROC_INHERIT.
(inf_ttrace_create_inferior, inf_ttrace_attach): Add checks for
inf_ttrace_vfork_ppid.
(inf_ttrace_kill_inferior, inf_ttrace_detach): Detach from waiting
parent if appropriate.
(inf_ttrace_wait): Handle TTEVT_FORK and TTEVT_VFORK.
(inf_ttrace_target): Set to_follow_fork.
2005-07-20 Wu Zhou <woodzltc@cn.ibm.com>
* remote.c (remote_pid_to_str): Use xsnprintf instead of snprintf.

199
gdb/inf-ttrace.c
View file

@ -397,6 +397,132 @@ inf_ttrace_stopped_by_watchpoint (void)
}
/* When tracking a vfork(2), we cannot detach from the parent until
after the child has called exec(3) or has exited. If we are still
attached to the parent, this variable will be set to the process ID
of the parent. Otherwise it will be set to zero. */
static pid_t inf_ttrace_vfork_ppid = -1;
static int
inf_ttrace_follow_fork (int follow_child)
{
pid_t pid, fpid;
lwpid_t lwpid, flwpid;
ttstate_t tts;
/* FIXME: kettenis/20050720: This stuff should really be passed as
an argument by our caller. */
{
ptid_t ptid;
struct target_waitstatus status;
get_last_target_status (&ptid, &status);
gdb_assert (status.kind == TARGET_WAITKIND_FORKED
|| status.kind == TARGET_WAITKIND_VFORKED);
pid = ptid_get_pid (ptid);
lwpid = ptid_get_lwp (ptid);
}
/* Get all important details that core GDB doesn't (and shouldn't)
know about. */
if (ttrace (TT_LWP_GET_STATE, pid, lwpid,
(uintptr_t)&tts, sizeof tts, 0) == -1)
perror_with_name (("ttrace"));
gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK);
if (tts.tts_u.tts_fork.tts_isparent)
{
pid = tts.tts_pid;
lwpid = tts.tts_lwpid;
fpid = tts.tts_u.tts_fork.tts_fpid;
flwpid = tts.tts_u.tts_fork.tts_flwpid;
}
else
{
pid = tts.tts_u.tts_fork.tts_fpid;
lwpid = tts.tts_u.tts_fork.tts_flwpid;
fpid = tts.tts_pid;
flwpid = tts.tts_lwpid;
}
if (follow_child)
{
inferior_ptid = ptid_build (fpid, flwpid, 0);
detach_breakpoints (pid);
target_terminal_ours ();
fprintf_unfiltered (gdb_stdlog, _("\
Attaching after fork to child process %ld.\n"), (long)fpid);
}
else
{
inferior_ptid = ptid_build (pid, lwpid, 0);
detach_breakpoints (fpid);
target_terminal_ours ();
fprintf_unfiltered (gdb_stdlog, _("\
Detaching after fork from child process %ld.\n"), (long)fpid);
}
if (tts.tts_event == TTEVT_VFORK)
{
gdb_assert (!tts.tts_u.tts_fork.tts_isparent);
if (follow_child)
{
/* We can't detach from the parent yet. */
inf_ttrace_vfork_ppid = pid;
reattach_breakpoints (fpid);
}
else
{
if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1)
perror_with_name (("ttrace"));
/* Wait till we get the TTEVT_VFORK event in the parent.
This indicates that the child has called exec(3) or has
exited and that the parent is ready to be traced again. */
if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1)
perror_with_name (("ttrace_wait"));
gdb_assert (tts.tts_event == TTEVT_VFORK);
gdb_assert (tts.tts_u.tts_fork.tts_isparent);
reattach_breakpoints (pid);
}
}
else
{
gdb_assert (tts.tts_u.tts_fork.tts_isparent);
if (follow_child)
{
if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1)
perror_with_name (("ttrace"));
}
else
{
if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1)
perror_with_name (("ttrace"));
}
}
if (follow_child)
{
/* The child will start out single-threaded. */
inf_ttrace_num_lwps = 0;
inf_ttrace_num_lwps_in_syscall = 0;
/* Reset breakpoints in the child as appropriate. */
follow_inferior_reset_breakpoints ();
}
return 0;
}
/* File descriptors for pipes used as semaphores during initial
startup of an inferior. */
static int inf_ttrace_pfd1[2];
@ -463,12 +589,12 @@ inf_ttrace_him (int pid)
/* Set the initial event mask. */
memset (&tte, 0, sizeof (tte));
tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT;
tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK;
tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE;
#ifdef TTEVT_BPT_SSTEP
tte.tte_events |= TTEVT_BPT_SSTEP;
#endif
tte.tte_opts = TTEO_NOSTRCCHLD;
tte.tte_opts |= TTEO_PROC_INHERIT;
if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
(uintptr_t)&tte, sizeof tte, 0) == -1)
perror_with_name (("ttrace"));
@ -506,6 +632,7 @@ inf_ttrace_create_inferior (char *exec_file, char *allargs, char **env,
gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
gdb_assert (inf_ttrace_page_dict.count == 0);
gdb_assert (inf_ttrace_reenable_page_protections == 0);
gdb_assert (inf_ttrace_vfork_ppid == -1);
fork_inferior (exec_file, allargs, env, inf_ttrace_me, inf_ttrace_him,
inf_ttrace_prepare, NULL);
@ -528,6 +655,14 @@ inf_ttrace_kill_inferior (void)
if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1)
perror_with_name (("ttrace"));
/* ??? Is it necessary to call ttrace_wait() here? */
if (inf_ttrace_vfork_ppid != -1)
{
if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1)
perror_with_name (("ttrace"));
inf_ttrace_vfork_ppid = -1;
}
target_mourn_inferior ();
}
@ -594,6 +729,7 @@ inf_ttrace_attach (char *args, int from_tty)
gdb_assert (inf_ttrace_num_lwps == 0);
gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
gdb_assert (inf_ttrace_vfork_ppid == -1);
if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1)
perror_with_name (("ttrace"));
@ -601,12 +737,12 @@ inf_ttrace_attach (char *args, int from_tty)
/* Set the initial event mask. */
memset (&tte, 0, sizeof (tte));
tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT;
tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK;
tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE;
#ifdef TTEVT_BPT_SSTEP
tte.tte_events |= TTEVT_BPT_SSTEP;
#endif
tte.tte_opts = TTEO_NOSTRCCHLD;
tte.tte_opts |= TTEO_PROC_INHERIT;
if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
(uintptr_t)&tte, sizeof tte, 0) == -1)
perror_with_name (("ttrace"));
@ -642,6 +778,13 @@ inf_ttrace_detach (char *args, int from_tty)
if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1)
perror_with_name (("ttrace"));
if (inf_ttrace_vfork_ppid != -1)
{
if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1)
perror_with_name (("ttrace"));
inf_ttrace_vfork_ppid = -1;
}
inf_ttrace_num_lwps = 0;
inf_ttrace_num_lwps_in_syscall = 0;
@ -699,9 +842,9 @@ inf_ttrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
if (pid == -1)
pid = 0;
pid = lwpid = 0;
gdb_assert (lwpid == 0 || pid != 0);
gdb_assert (pid != 0 || lwpid == 0);
do
{
@ -711,6 +854,20 @@ inf_ttrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1)
perror_with_name (("ttrace_wait"));
if (tts.tts_event == TTEVT_VFORK && tts.tts_u.tts_fork.tts_isparent)
{
if (inf_ttrace_vfork_ppid != -1)
{
gdb_assert (inf_ttrace_vfork_ppid == tts.tts_pid);
if (ttrace (TT_PROC_DETACH, tts.tts_pid, 0, 0, 0, 0) == -1)
perror_with_name (("ttrace"));
inf_ttrace_vfork_ppid = -1;
}
tts.tts_event = TTEVT_NONE;
}
clear_sigio_trap ();
clear_sigint_trap ();
}
@ -747,6 +904,35 @@ inf_ttrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
inf_ttrace_num_lwps = 0;
break;
case TTEVT_FORK:
ourstatus->kind = TARGET_WAITKIND_FORKED;
ourstatus->value.related_pid = tts.tts_u.tts_fork.tts_fpid;
/* Make sure the other end of the fork is stopped too. */
if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid,
tts.tts_u.tts_fork.tts_flwpid,
TTRACE_WAITOK, &tts, sizeof tts) == -1)
perror_with_name (("ttrace_wait"));
gdb_assert (tts.tts_event == TTEVT_FORK);
if (tts.tts_u.tts_fork.tts_isparent)
{
ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
ourstatus->value.related_pid = tts.tts_u.tts_fork.tts_fpid;
}
break;
case TTEVT_VFORK:
gdb_assert (!tts.tts_u.tts_fork.tts_isparent);
ourstatus->kind = TARGET_WAITKIND_VFORKED;
ourstatus->value.related_pid = tts.tts_u.tts_fork.tts_fpid;
/* HACK: To avoid touching the parent during the vfork, switch
away from it. */
inferior_ptid = ptid;
break;
case TTEVT_LWP_CREATE:
lwpid = tts.tts_u.tts_thread.tts_target_lwpid;
ptid = ptid_build (tts.tts_pid, lwpid, 0);
@ -935,6 +1121,7 @@ inf_ttrace_target (void)
t->to_files_info = inf_ttrace_files_info;
t->to_thread_alive = inf_ttrace_thread_alive;
t->to_pid_to_str = inf_ttrace_pid_to_str;
t->to_follow_fork = inf_ttrace_follow_fork;
t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint;
t->to_region_size_ok_for_hw_watchpoint =
inf_ttrace_region_size_ok_for_hw_watchpoint;