| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* BSD-like signal function. |
| 2 | Copyright (C) 1991-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <signal.h> |
| 21 | #include <string.h> /* For the real memset prototype. */ |
| 22 | |
| 23 | |
| 24 | sigset_t _sigintr attribute_hidden; /* Set by siginterrupt. */ |
| 25 | |
| 26 | /* Set the handler for the signal SIG to HANDLER, |
| 27 | returning the old handler, or SIG_ERR on error. */ |
| 28 | __sighandler_t |
| 29 | __bsd_signal (sig, handler) |
| 30 | int sig; |
| 31 | __sighandler_t handler; |
| 32 | { |
| 33 | struct sigaction act, oact; |
| 34 | |
| 35 | /* Check signal extents to protect __sigismember. */ |
| 36 | if (handler == SIG_ERR || sig < 1 || sig >= NSIG) |
| 37 | { |
| 38 | __set_errno (EINVAL); |
| 39 | return SIG_ERR; |
| 40 | } |
| 41 | |
| 42 | act.sa_handler = handler; |
| 43 | if (__sigemptyset (&act.sa_mask) < 0 |
| 44 | || __sigaddset (&act.sa_mask, sig) < 0) |
| 45 | return SIG_ERR; |
| 46 | act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART; |
| 47 | if (__sigaction (sig, &act, &oact) < 0) |
| 48 | return SIG_ERR; |
| 49 | |
| 50 | return oact.sa_handler; |
| 51 | } |
| 52 | weak_alias (__bsd_signal, bsd_signal) |
| 53 | weak_alias (__bsd_signal, signal) |
| 54 | weak_alias (__bsd_signal, ssignal) |