/* 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