| /* 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) |