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/* POSIX.1 sigaction call for Linux/SPARC.
Copyright (C) 1997-2000,2002,2003,2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997.
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.
Ported to uClibc from glibc: 090520:
Jan Buchholz, KIP, Uni Heidelberg <jan.buchholz@kip.uni-heidelberg.de>
Austin Foxley, Ceton Corporation <austinf@cetoncorp.com>
*/
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/syscall.h>
#include <bits/kernel_sigaction.h>
_syscall5(int, rt_sigaction, int, a, int, b, int, c, int, d, int, e);
static void __rt_sigreturn_stub(void);
static void __sigreturn_stub(void);
int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
{
int ret;
struct old_kernel_sigaction kact, koact;
unsigned long stub = 0;
int saved_errno = errno;
if (act) {
kact.k_sa_handler = act->sa_handler;
// BUG?! kact.sa_mask is a long, but sigset_t is a vector
// of longs and it may be bigger (in glibc, it _is_ bigger).
// Should we do this instead?
// kact.sa_mask = act->sa_mask.__val[0];
memcpy(&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
kact.sa_flags = act->sa_flags;
if (kact.sa_flags & SA_SIGINFO)
stub = (unsigned long) &__rt_sigreturn_stub;
else
stub = (unsigned long) &__sigreturn_stub;
stub -= 8;
kact.sa_restorer = NULL;
}
/* NB: kernel (as of 2.6.25) will return EINVAL
* if _NSIG / 8 does not match kernel's sizeof(sigset_t) */
ret = rt_sigaction(sig,
(int)(act ? &kact : NULL),
(int)(oact ? &koact : NULL),
stub,
_NSIG / 8);
// BUG?! if ret == -1, we return -1 but do not set errno?!
if (ret >= 0 || errno != ENOSYS) {
if (oact && ret >= 0) {
oact->sa_handler = koact.k_sa_handler;
// maybe oact->sa_mask.__val[0] = koact.sa_mask; ?
memcpy(&oact->sa_mask, &koact.sa_mask, sizeof(sigset_t));
oact->sa_flags = koact.sa_flags;
oact->sa_restorer = koact.sa_restorer;
}
return ret;
}
__set_errno(saved_errno);
return -1;
}
#ifndef LIBC_SIGACTION
weak_alias(__libc_sigaction,sigaction)
libc_hidden_weak(sigaction)
#endif
static void
__rt_sigreturn_stub(void)
{
__asm__(
"mov %0, %%g1\n\t"
"ta 0x10\n\t"
: /* no outputs */
: "i" (__NR_rt_sigreturn)
);
}
static void
__sigreturn_stub(void)
{
__asm__(
"mov %0, %%g1\n\t"
"ta 0x10\n\t"
: /* no outputs */
: "i" (__NR_sigreturn)
);
}
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