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* linux-low.c (my_waitpid): Move definition away from being in

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between linux_tracefork_child/linux_test_for_tracefork.
This commit is contained in:
Doug Evans 2009-12-19 01:16:23 +00:00
parent f19732033a
commit 07d4f67e9d
2 changed files with 78 additions and 75 deletions
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3
gdb/gdbserver/ChangeLog
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@ -1,5 +1,8 @@
2009-12-18 Doug Evans <dje@google.com>
* linux-low.c (my_waitpid): Move definition away from being in
between linux_tracefork_child/linux_test_for_tracefork.
* gdb_proc_service.h (psaddr_t): Fix type.
* thread-db.c (thread_db_info.td_thr_tls_get_addr_p): Fix
signature to match glibc.

150
gdb/gdbserver/linux-low.c
View File

@ -272,6 +272,81 @@ linux_remove_process (struct process_info *process, int detaching)
remove_process (process);
}
/* Wrapper function for waitpid which handles EINTR, and emulates
__WALL for systems where that is not available. */
static int
my_waitpid (int pid, int *status, int flags)
{
int ret, out_errno;
if (debug_threads)
fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags);
if (flags & __WALL)
{
sigset_t block_mask, org_mask, wake_mask;
int wnohang;
wnohang = (flags & WNOHANG) != 0;
flags &= ~(__WALL | __WCLONE);
flags |= WNOHANG;
/* Block all signals while here. This avoids knowing about
LinuxThread's signals. */
sigfillset (&block_mask);
sigprocmask (SIG_BLOCK, &block_mask, &org_mask);
/* ... except during the sigsuspend below. */
sigemptyset (&wake_mask);
while (1)
{
/* Since all signals are blocked, there's no need to check
for EINTR here. */
ret = waitpid (pid, status, flags);
out_errno = errno;
if (ret == -1 && out_errno != ECHILD)
break;
else if (ret > 0)
break;
if (flags & __WCLONE)
{
/* We've tried both flavors now. If WNOHANG is set,
there's nothing else to do, just bail out. */
if (wnohang)
break;
if (debug_threads)
fprintf (stderr, "blocking\n");
/* Block waiting for signals. */
sigsuspend (&wake_mask);
}
flags ^= __WCLONE;
}
sigprocmask (SIG_SETMASK, &org_mask, NULL);
}
else
{
do
ret = waitpid (pid, status, flags);
while (ret == -1 && errno == EINTR);
out_errno = errno;
}
if (debug_threads)
fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n",
pid, flags, status ? *status : -1, ret);
errno = out_errno;
return ret;
}
/* Handle a GNU/Linux extended wait response. If we see a clone
event, we need to add the new LWP to our list (and not report the
trap to higher layers). */
@ -2475,81 +2550,6 @@ linux_tracefork_child (void *arg)
_exit (0);
}
/* Wrapper function for waitpid which handles EINTR, and emulates
__WALL for systems where that is not available. */
static int
my_waitpid (int pid, int *status, int flags)
{
int ret, out_errno;
if (debug_threads)
fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags);
if (flags & __WALL)
{
sigset_t block_mask, org_mask, wake_mask;
int wnohang;
wnohang = (flags & WNOHANG) != 0;
flags &= ~(__WALL | __WCLONE);
flags |= WNOHANG;
/* Block all signals while here. This avoids knowing about
LinuxThread's signals. */
sigfillset (&block_mask);
sigprocmask (SIG_BLOCK, &block_mask, &org_mask);
/* ... except during the sigsuspend below. */
sigemptyset (&wake_mask);
while (1)
{
/* Since all signals are blocked, there's no need to check
for EINTR here. */
ret = waitpid (pid, status, flags);
out_errno = errno;
if (ret == -1 && out_errno != ECHILD)
break;
else if (ret > 0)
break;
if (flags & __WCLONE)
{
/* We've tried both flavors now. If WNOHANG is set,
there's nothing else to do, just bail out. */
if (wnohang)
break;
if (debug_threads)
fprintf (stderr, "blocking\n");
/* Block waiting for signals. */
sigsuspend (&wake_mask);
}
flags ^= __WCLONE;
}
sigprocmask (SIG_SETMASK, &org_mask, NULL);
}
else
{
do
ret = waitpid (pid, status, flags);
while (ret == -1 && errno == EINTR);
out_errno = errno;
}
if (debug_threads)
fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n",
pid, flags, status ? *status : -1, ret);
errno = out_errno;
return ret;
}
/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
sure that we can enable the option, and that it had the desired
effect. */