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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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