projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f7a9f785 | 1 | /* Copyright (C) 1998-2016 Free Software Foundation, Inc. |
| af69217f UD |
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 | |
| 41bdb6e2 AJ |
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. | |
| af69217f UD |
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 | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| af69217f | 13 | |
| 41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| af69217f UD |
17 | |
| 18 | #include <errno.h> | |
| 8619129f UD |
19 | #define __need_NULL |
| 20 | #include <stddef.h> | |
| af69217f | 21 | #include <signal.h> |
| 99c7f870 | 22 | #include <string.h> /* For the real memset prototype. */ |
| af69217f UD |
23 | |
| 24 | ||
| 25 | /* Set the disposition for SIG. */ | |
| 26 | __sighandler_t | |
| bd2260a2 | 27 | sigset (int sig, __sighandler_t disp) |
| af69217f | 28 | { |
| 727a6832 UD |
29 | struct sigaction act; |
| 30 | struct sigaction oact; | |
| 4bdd6453 | 31 | sigset_t set; |
| 727a6832 | 32 | sigset_t oset; |
| af69217f | 33 | |
| 9d141cae | 34 | #ifdef SIG_HOLD |
| af69217f UD |
35 | /* Handle SIG_HOLD first. */ |
| 36 | if (disp == SIG_HOLD) | |
| 37 | { | |
| 4bdd6453 UD |
38 | /* Create an empty signal set. */ |
| 39 | if (__sigemptyset (&set) < 0) | |
| af69217f UD |
40 | return SIG_ERR; |
| 41 | ||
| 42 | /* Add the specified signal. */ | |
| 4aebaa6b | 43 | if (__sigaddset (&set, sig) < 0) |
| af69217f UD |
44 | return SIG_ERR; |
| 45 | ||
| 4bdd6453 | 46 | /* Add the signal set to the current signal mask. */ |
| 727a6832 | 47 | if (__sigprocmask (SIG_BLOCK, &set, &oset) < 0) |
| af69217f UD |
48 | return SIG_ERR; |
| 49 | ||
| 727a6832 UD |
50 | /* If the signal was already blocked signal this to the caller. */ |
| 51 | if (__sigismember (&oset, sig)) | |
| 52 | return SIG_HOLD; | |
| 53 | ||
| 54 | /* We need to determine whether a specific handler is installed. */ | |
| 55 | if (__sigaction (sig, NULL, &oact) < 0) | |
| 56 | return SIG_ERR; | |
| 57 | ||
| 58 | return oact.sa_handler; | |
| af69217f | 59 | } |
| 9d141cae | 60 | #endif /* SIG_HOLD */ |
| af69217f UD |
61 | |
| 62 | /* Check signal extents to protect __sigismember. */ | |
| 63 | if (disp == SIG_ERR || sig < 1 || sig >= NSIG) | |
| 64 | { | |
| 65 | __set_errno (EINVAL); | |
| 66 | return SIG_ERR; | |
| 67 | } | |
| 68 | ||
| 69 | act.sa_handler = disp; | |
| 70 | if (__sigemptyset (&act.sa_mask) < 0) | |
| 71 | return SIG_ERR; | |
| 72 | act.sa_flags = 0; | |
| 73 | if (__sigaction (sig, &act, &oact) < 0) | |
| 74 | return SIG_ERR; | |
| 75 | ||
| 4bdd6453 UD |
76 | /* Create an empty signal set. */ |
| 77 | if (__sigemptyset (&set) < 0) | |
| 78 | return SIG_ERR; | |
| 79 | ||
| 80 | /* Add the specified signal. */ | |
| 4aebaa6b | 81 | if (__sigaddset (&set, sig) < 0) |
| 4bdd6453 UD |
82 | return SIG_ERR; |
| 83 | ||
| 84 | /* Remove the signal set from the current signal mask. */ | |
| 727a6832 | 85 | if (__sigprocmask (SIG_UNBLOCK, &set, &oset) < 0) |
| 4bdd6453 UD |
86 | return SIG_ERR; |
| 87 | ||
| 727a6832 UD |
88 | /* If the signal was already blocked return SIG_HOLD. */ |
| 89 | return __sigismember (&oset, sig) ? SIG_HOLD : oact.sa_handler; | |
| af69217f | 90 | } |