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/* Copyright (C) 1997,1998,1999,2000,2002,2003 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/>.
Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
*/
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/syscall.h>
#include <bits/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. */
#ifdef __NR_rt_sigreturn
#define choose_restorer(flags) \
(flags & SA_SIGINFO) ? __default_rt_sa_restorer \
: __default_sa_restorer
#else
#define choose_restorer(flags) \
__default_sa_restorer
#endif
#ifdef __NR_rt_sigaction
/* 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)
{
struct sigaction kact;
if (act && !(act->sa_flags & SA_RESTORER)) {
memcpy(&kact, act, sizeof(kact));
kact.sa_restorer = choose_restorer(kact.sa_flags);
kact.sa_flags |= SA_RESTORER;
act = &kact;
}
/* NB: kernel (as of 2.6.25) will return EINVAL
* if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
}
#else
/* 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 old_kernel_sigaction kact, koact;
if (act) {
kact.k_sa_handler = act->sa_handler;
kact.sa_mask = act->sa_mask.__val[0];
kact.sa_flags = act->sa_flags;
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;
}
}
result = __syscall_sigaction(sig,
act ? &kact : NULL,
oact ? &koact : NULL);
if (oact && result >= 0) {
oact->sa_handler = koact.k_sa_handler;
oact->sa_mask.__val[0] = koact.sa_mask;
oact->sa_flags = koact.sa_flags;
oact->sa_restorer = koact.sa_restorer;
}
return result;
}
#endif
#ifndef LIBC_SIGACTION
# ifndef __UCLIBC_HAS_THREADS__
strong_alias(__libc_sigaction,sigaction)
libc_hidden_def(sigaction)
# else
weak_alias(__libc_sigaction,sigaction)
libc_hidden_weak(sigaction)
# endif
#endif
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