/* Copyright (C) 1992,1994,1995,1996,1997,2002 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <sysdep.h> #include <errno.h> #include <stddef.h> #include <signal.h> /* 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 __sigaction (sig, act, oact) int sig; const struct sigaction *act; struct sigaction *oact; { sighandler_t handler; int save; if (sig <= 0 || sig >= NSIG) { __set_errno (EINVAL); return -1; } if (act == NULL) { if (oact == NULL) return 0; /* Race condition, but this is the only way to do it. */ handler = signal (sig, SIG_IGN); if (handler == SIG_ERR) return -1; save = errno; (void) signal (sig, handler); __set_errno (save); } else { int i; if (act->sa_flags != 0) { unimplemented: __set_errno (ENOSYS); return -1; } for (i = 1; i < NSIG; ++i) if (__sigismember (&act->sa_mask, i)) goto unimplemented; handler = signal (sig, act->sa_handler); if (handler == SIG_ERR) return -1; } if (oact != NULL) { oact->sa_handler = handler; __sigemptyset (&oact->sa_mask); oact->sa_flags = 0; } return 0; } libc_hidden_def (__sigaction) weak_alias (__sigaction, sigaction)