| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1992, 1994, 1996, 2002 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 <stddef.h> |
| 20 | #include <signal.h> |
| 21 | #include <errno.h> |
| 22 | |
| 23 | |
| 24 | /* If INTERRUPT is nonzero, make signal SIG interrupt system calls |
| 25 | (causing them to fail with EINTR); if INTERRUPT is zero, make system |
| 26 | calls be restarted after signal SIG. */ |
| 27 | #ifdef SA_RESTART |
| 28 | extern sigset_t _sigintr attribute_hidden; /* Defined in signal.c. */ |
| 29 | #endif |
| 30 | |
| 31 | int siginterrupt (int sig, int interrupt) |
| 32 | { |
| 33 | #ifdef SA_RESTART |
| 34 | struct sigaction action; |
| 35 | |
| 36 | /* Fails if sig is bad. */ |
| 37 | if (sigaction (sig, NULL, &action) < 0) |
| 38 | return -1; |
| 39 | |
| 40 | if (interrupt) |
| 41 | { |
| 42 | __sigaddset (&_sigintr, sig); |
| 43 | action.sa_flags &= ~SA_RESTART; |
| 44 | } |
| 45 | else |
| 46 | { |
| 47 | __sigdelset (&_sigintr, sig); |
| 48 | action.sa_flags |= SA_RESTART; |
| 49 | } |
| 50 | |
| 51 | return sigaction (sig, &action, NULL); |
| 52 | #else |
| 53 | __set_errno (ENOSYS); |
| 54 | return -1; |
| 55 | #endif |
| 56 | } |