mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
727a6832f0
2006-04-23 Ulrich Drepper <drepper@redhat.com> [BZ #1951] * sysdeps/posix/sigset.c (sigset): Return correct value reflecting previous signal state. * signal/Makefile (tests): Add tst-sigset2. * signal/tst-sigset2.c: New file.
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* Copyright (C) 1998, 2000, 2005, 2006 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#define __need_NULL
|
|
#include <stddef.h>
|
|
#include <signal.h>
|
|
#include <string.h> /* For the real memset prototype. */
|
|
|
|
|
|
/* Set the disposition for SIG. */
|
|
__sighandler_t
|
|
sigset (sig, disp)
|
|
int sig;
|
|
__sighandler_t disp;
|
|
{
|
|
struct sigaction act;
|
|
struct sigaction oact;
|
|
sigset_t set;
|
|
sigset_t oset;
|
|
|
|
#ifdef SIG_HOLD
|
|
/* Handle SIG_HOLD first. */
|
|
if (disp == SIG_HOLD)
|
|
{
|
|
/* Create an empty signal set. */
|
|
if (__sigemptyset (&set) < 0)
|
|
return SIG_ERR;
|
|
|
|
/* Add the specified signal. */
|
|
if (__sigaddset (&set, sig) < 0)
|
|
return SIG_ERR;
|
|
|
|
/* Add the signal set to the current signal mask. */
|
|
if (__sigprocmask (SIG_BLOCK, &set, &oset) < 0)
|
|
return SIG_ERR;
|
|
|
|
/* If the signal was already blocked signal this to the caller. */
|
|
if (__sigismember (&oset, sig))
|
|
return SIG_HOLD;
|
|
|
|
/* We need to determine whether a specific handler is installed. */
|
|
if (__sigaction (sig, NULL, &oact) < 0)
|
|
return SIG_ERR;
|
|
|
|
return oact.sa_handler;
|
|
}
|
|
#endif /* SIG_HOLD */
|
|
|
|
/* Check signal extents to protect __sigismember. */
|
|
if (disp == SIG_ERR || sig < 1 || sig >= NSIG)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return SIG_ERR;
|
|
}
|
|
|
|
act.sa_handler = disp;
|
|
if (__sigemptyset (&act.sa_mask) < 0)
|
|
return SIG_ERR;
|
|
act.sa_flags = 0;
|
|
if (__sigaction (sig, &act, &oact) < 0)
|
|
return SIG_ERR;
|
|
|
|
/* Create an empty signal set. */
|
|
if (__sigemptyset (&set) < 0)
|
|
return SIG_ERR;
|
|
|
|
/* Add the specified signal. */
|
|
if (__sigaddset (&set, sig) < 0)
|
|
return SIG_ERR;
|
|
|
|
/* Remove the signal set from the current signal mask. */
|
|
if (__sigprocmask (SIG_UNBLOCK, &set, &oset) < 0)
|
|
return SIG_ERR;
|
|
|
|
/* If the signal was already blocked return SIG_HOLD. */
|
|
return __sigismember (&oset, sig) ? SIG_HOLD : oact.sa_handler;
|
|
}
|