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04277e02 | 1 | /* Copyright (C) 1991-2019 Free Software Foundation, Inc. |
d38cd08c 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. | |
d38cd08c 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. |
d38cd08c | 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/>. */ |
d38cd08c UD |
17 | |
18 | #include <errno.h> | |
19 | #include <signal.h> | |
99c7f870 | 20 | #include <string.h> /* For the real memset prototype. */ |
a992f506 | 21 | #include <sigsetops.h> |
d38cd08c | 22 | |
df4ef2ab UD |
23 | /* Tolerate non-threads versions of Posix */ |
24 | #ifndef SA_ONESHOT | |
25 | #define SA_ONESHOT 0 | |
26 | #endif | |
27 | #ifndef SA_NOMASK | |
28 | #define SA_NOMASK 0 | |
29 | #endif | |
30 | #ifndef SA_INTERRUPT | |
31 | #define SA_INTERRUPT 0 | |
32 | #endif | |
d38cd08c UD |
33 | |
34 | /* Set the handler for the signal SIG to HANDLER, | |
35 | returning the old handler, or SIG_ERR on error. */ | |
36 | __sighandler_t | |
bd2260a2 | 37 | __sysv_signal (int sig, __sighandler_t handler) |
d38cd08c UD |
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; | |
a992f506 | 49 | __sigemptyset (&act.sa_mask); |
df4ef2ab UD |
50 | act.sa_flags = SA_ONESHOT | SA_NOMASK | SA_INTERRUPT; |
51 | act.sa_flags &= ~SA_RESTART; | |
d38cd08c UD |
52 | if (__sigaction (sig, &act, &oact) < 0) |
53 | return SIG_ERR; | |
54 | ||
55 | return oact.sa_handler; | |
56 | } | |
f43ce637 UD |
57 | |
58 | weak_alias (__sysv_signal, sysv_signal) |