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d614a753 | 1 | /* Copyright (C) 1998-2020 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 | |
a992f506 | 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 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
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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. */ |
a992f506 | 23 | #include <sigsetops.h> |
af69217f UD |
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 | |
a992f506 | 34 | __sigemptyset (&set); |
d2dc5467 AZ |
35 | if (sigaddset (&set, sig) < 0) |
36 | return SIG_ERR; | |
af69217f | 37 | |
a992f506 ZW |
38 | if (disp == SIG_HOLD) |
39 | { | |
40 | /* Add the signal to the current signal mask. */ | |
727a6832 | 41 | if (__sigprocmask (SIG_BLOCK, &set, &oset) < 0) |
af69217f UD |
42 | return SIG_ERR; |
43 | ||
727a6832 UD |
44 | /* If the signal was already blocked signal this to the caller. */ |
45 | if (__sigismember (&oset, sig)) | |
46 | return SIG_HOLD; | |
47 | ||
48 | /* We need to determine whether a specific handler is installed. */ | |
49 | if (__sigaction (sig, NULL, &oact) < 0) | |
50 | return SIG_ERR; | |
51 | ||
52 | return oact.sa_handler; | |
af69217f | 53 | } |
a992f506 | 54 | else |
af69217f | 55 | { |
a992f506 ZW |
56 | act.sa_handler = disp; |
57 | __sigemptyset (&act.sa_mask); | |
58 | act.sa_flags = 0; | |
59 | if (__sigaction (sig, &act, &oact) < 0) | |
60 | return SIG_ERR; | |
4bdd6453 | 61 | |
a992f506 ZW |
62 | /* Remove the signal from the current signal mask. */ |
63 | if (__sigprocmask (SIG_UNBLOCK, &set, &oset) < 0) | |
64 | return SIG_ERR; | |
4bdd6453 | 65 | |
a992f506 ZW |
66 | /* If the signal was already blocked return SIG_HOLD. */ |
67 | return __sigismember (&oset, sig) ? SIG_HOLD : oact.sa_handler; | |
68 | } | |
af69217f | 69 | } |