| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1991, 1992, 1996, 1997, 2005 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, write to the Free |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 17 | 02111-1307 USA. */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <signal.h> |
| 21 | #include <string.h> /* For the real memset prototype. */ |
| 22 | |
| 23 | |
| 24 | /* Tolerate non-threads versions of Posix */ |
| 25 | #ifndef SA_ONESHOT |
| 26 | #define SA_ONESHOT 0 |
| 27 | #endif |
| 28 | #ifndef SA_NOMASK |
| 29 | #define SA_NOMASK 0 |
| 30 | #endif |
| 31 | #ifndef SA_INTERRUPT |
| 32 | #define SA_INTERRUPT 0 |
| 33 | #endif |
| 34 | |
| 35 | /* Set the handler for the signal SIG to HANDLER, |
| 36 | returning the old handler, or SIG_ERR on error. */ |
| 37 | __sighandler_t __sysv_signal (int sig, __sighandler_t handler) |
| 38 | { |
| 39 | struct sigaction act, oact; |
| 40 | |
| 41 | /* Check signal extents to protect __sigismember. */ |
| 42 | if (handler == SIG_ERR || sig < 1 || sig >= NSIG) |
| 43 | { |
| 44 | __set_errno (EINVAL); |
| 45 | return SIG_ERR; |
| 46 | } |
| 47 | |
| 48 | act.sa_handler = handler; |
| 49 | __sigemptyset (&act.sa_mask); |
| 50 | act.sa_flags = (SA_ONESHOT | SA_NOMASK | SA_INTERRUPT) & ~SA_RESTART; |
| 51 | /* In Linux (as of 2.6.25), fails only if sig is SIGKILL or SIGSTOP */ |
| 52 | if (sigaction (sig, &act, &oact) < 0) |
| 53 | return SIG_ERR; |
| 54 | |
| 55 | return oact.sa_handler; |
| 56 | } |
| 57 | strong_alias(__sysv_signal,sysv_signal) |