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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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