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glibc/sysdeps/unix/sysv/linux/arm/sigaction.c
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/* Copyright (C) 1997-2014 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, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <signal.h> | |
#include <string.h> | |
#include <sysdep.h> | |
#include <sys/syscall.h> | |
/* The difference here is that the sigaction structure used in the | |
kernel is not the same as we use in the libc. Therefore we must | |
translate it here. */ | |
#include <kernel_sigaction.h> | |
#define SA_RESTORER 0x04000000 | |
extern void __default_sa_restorer (void); | |
extern void __default_rt_sa_restorer (void); | |
/* When RT signals are in use we need to use a different return stub. */ | |
#define choose_restorer(flags) \ | |
(flags & SA_SIGINFO) ? __default_rt_sa_restorer \ | |
: __default_sa_restorer | |
/* If ACT is not NULL, change the action for SIG to *ACT. | |
If OACT is not NULL, put the old action for SIG in *OACT. */ | |
int | |
__libc_sigaction (sig, act, oact) | |
int sig; | |
const struct sigaction *act; | |
struct sigaction *oact; | |
{ | |
int result; | |
struct kernel_sigaction kact, koact; | |
if (act) | |
{ | |
kact.k_sa_handler = act->sa_handler; | |
memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t)); | |
kact.sa_flags = act->sa_flags; | |
#ifdef HAVE_SA_RESTORER | |
if (kact.sa_flags & SA_RESTORER) | |
kact.sa_restorer = act->sa_restorer; | |
else | |
{ | |
kact.sa_restorer = choose_restorer (kact.sa_flags); | |
kact.sa_flags |= SA_RESTORER; | |
} | |
#endif | |
} | |
/* XXX The size argument hopefully will have to be changed to the | |
real size of the user-level sigset_t. */ | |
result = INLINE_SYSCALL (rt_sigaction, 4, sig, | |
act ? &kact : NULL, | |
oact ? &koact : NULL, _NSIG / 8); | |
if (oact && result >= 0) | |
{ | |
oact->sa_handler = koact.k_sa_handler; | |
memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t)); | |
oact->sa_flags = koact.sa_flags; | |
#ifdef HAVE_SA_RESTORER | |
oact->sa_restorer = koact.sa_restorer; | |
#endif | |
} | |
return result; | |
} | |
libc_hidden_def (__libc_sigaction) | |
#ifdef WRAPPER_INCLUDE | |
# include WRAPPER_INCLUDE | |
#endif | |
#ifndef LIBC_SIGACTION | |
weak_alias (__libc_sigaction, __sigaction) | |
libc_hidden_weak (__sigaction) | |
weak_alias (__libc_sigaction, sigaction) | |
#endif |