projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 4aebaa6b | 1 | /* Copyright (C) 1998, 2000 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 AJ |
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. */ | |
| af69217f UD |
18 | |
| 19 | #include <errno.h> | |
| 8619129f UD |
20 | #define __need_NULL |
| 21 | #include <stddef.h> | |
| af69217f UD |
22 | #include <signal.h> |
| 23 | ||
| 24 | ||
| 25 | /* Set the disposition for SIG. */ | |
| 26 | __sighandler_t | |
| 27 | sigset (sig, disp) | |
| 28 | int sig; | |
| 29 | __sighandler_t disp; | |
| 30 | { | |
| 31 | struct sigaction act, oact; | |
| 4bdd6453 | 32 | sigset_t set; |
| 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 UD |
46 | /* Add the signal set to the current signal mask. */ |
| 47 | if (__sigprocmask (SIG_BLOCK, &set, NULL) < 0) | |
| af69217f UD |
48 | return SIG_ERR; |
| 49 | ||
| 50 | return SIG_HOLD; | |
| 51 | } | |
| 9d141cae | 52 | #endif /* SIG_HOLD */ |
| af69217f UD |
53 | |
| 54 | /* Check signal extents to protect __sigismember. */ | |
| 55 | if (disp == SIG_ERR || sig < 1 || sig >= NSIG) | |
| 56 | { | |
| 57 | __set_errno (EINVAL); | |
| 58 | return SIG_ERR; | |
| 59 | } | |
| 60 | ||
| 61 | act.sa_handler = disp; | |
| 62 | if (__sigemptyset (&act.sa_mask) < 0) | |
| 63 | return SIG_ERR; | |
| 64 | act.sa_flags = 0; | |
| 65 | if (__sigaction (sig, &act, &oact) < 0) | |
| 66 | return SIG_ERR; | |
| 67 | ||
| 4bdd6453 UD |
68 | /* Create an empty signal set. */ |
| 69 | if (__sigemptyset (&set) < 0) | |
| 70 | return SIG_ERR; | |
| 71 | ||
| 72 | /* Add the specified signal. */ | |
| 4aebaa6b | 73 | if (__sigaddset (&set, sig) < 0) |
| 4bdd6453 UD |
74 | return SIG_ERR; |
| 75 | ||
| 76 | /* Remove the signal set from the current signal mask. */ | |
| 77 | if (__sigprocmask (SIG_UNBLOCK, &set, NULL) < 0) | |
| 78 | return SIG_ERR; | |
| 79 | ||
| af69217f UD |
80 | return oact.sa_handler; |
| 81 | } |