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glibc/sysdeps/posix/sigset.c
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/* 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; | |
} |