mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-05 11:11:04 +00:00
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/* Copyright (C) 1997-2017 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 (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)
|
|
|
|
#include <nptl/sigaction.c>
|