mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 19:00:07 +00:00
140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/* Copyright (C) 1997-2000,2002,2003,2005,2006 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
|
|
#include <sysdep.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include <kernel-features.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>
|
|
|
|
#if __ASSUME_REALTIME_SIGNALS == 0
|
|
/* The variable is shared between all wrappers around signal handling
|
|
functions which have RT equivalents. This is the definition. */
|
|
int __libc_missing_rt_sigs;
|
|
#endif
|
|
|
|
|
|
/* 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;
|
|
{
|
|
#if __ASSUME_REALTIME_SIGNALS == 0
|
|
struct old_kernel_sigaction k_sigact, k_osigact;
|
|
#endif
|
|
int result;
|
|
|
|
#if defined __NR_rt_sigaction || __ASSUME_REALTIME_SIGNALS > 0
|
|
/* First try the RT signals. */
|
|
# if __ASSUME_REALTIME_SIGNALS == 0
|
|
if (!__libc_missing_rt_sigs)
|
|
# endif
|
|
{
|
|
struct kernel_sigaction kact, koact;
|
|
/* Save the current error value for later. We need not do this
|
|
if we are guaranteed to have realtime signals. */
|
|
# if __ASSUME_REALTIME_SIGNALS == 0
|
|
int saved_errno = errno;
|
|
# endif
|
|
|
|
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
|
|
kact.sa_restorer = act->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 ? __ptrvalue (&kact) : NULL,
|
|
oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
|
|
|
|
# if __ASSUME_REALTIME_SIGNALS == 0
|
|
if (result >= 0 || errno != ENOSYS)
|
|
# endif
|
|
{
|
|
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;
|
|
}
|
|
|
|
# if __ASSUME_REALTIME_SIGNALS == 0
|
|
__set_errno (saved_errno);
|
|
__libc_missing_rt_sigs = 1;
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
#if __ASSUME_REALTIME_SIGNALS == 0
|
|
if (act)
|
|
{
|
|
k_sigact.k_sa_handler = act->sa_handler;
|
|
k_sigact.sa_mask = act->sa_mask.__val[0];
|
|
k_sigact.sa_flags = act->sa_flags;
|
|
# ifdef HAVE_SA_RESTORER
|
|
k_sigact.sa_restorer = act->sa_restorer;
|
|
# endif
|
|
}
|
|
result = INLINE_SYSCALL (sigaction, 3, sig,
|
|
act ? __ptrvalue (&k_sigact) : NULL,
|
|
oact ? __ptrvalue (&k_osigact) : NULL);
|
|
if (oact && result >= 0)
|
|
{
|
|
oact->sa_handler = k_osigact.k_sa_handler;
|
|
oact->sa_mask.__val[0] = k_osigact.sa_mask;
|
|
oact->sa_flags = k_osigact.sa_flags;
|
|
# ifdef HAVE_SA_RESTORER
|
|
oact->sa_restorer = k_osigact.sa_restorer;
|
|
# endif
|
|
}
|
|
return result;
|
|
#endif
|
|
}
|
|
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
|