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df4ef2ab | 1 | /* BSD-like signal function. |
a334319f | 2 | Copyright (C) 1991,1992,1996,1997,2000,2002 Free Software Foundation, Inc. |
84384f5b | 3 | This file is part of the GNU C Library. |
28f540f4 | 4 | |
84384f5b | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 9 | |
84384f5b UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
28f540f4 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
28f540f4 | 19 | |
28f540f4 RM |
20 | #include <errno.h> |
21 | #include <signal.h> | |
22 | ||
23 | ||
1897bc3f | 24 | sigset_t _sigintr attribute_hidden; /* Set by siginterrupt. */ |
df4ef2ab | 25 | |
28f540f4 RM |
26 | /* Set the handler for the signal SIG to HANDLER, |
27 | returning the old handler, or SIG_ERR on error. */ | |
28 | __sighandler_t | |
df4ef2ab | 29 | __bsd_signal (sig, handler) |
c4029823 UD |
30 | int sig; |
31 | __sighandler_t handler; | |
28f540f4 RM |
32 | { |
33 | struct sigaction act, oact; | |
34 | ||
84384f5b UD |
35 | /* Check signal extents to protect __sigismember. */ |
36 | if (handler == SIG_ERR || sig < 1 || sig >= NSIG) | |
28f540f4 | 37 | { |
c4029823 | 38 | __set_errno (EINVAL); |
28f540f4 RM |
39 | return SIG_ERR; |
40 | } | |
41 | ||
42 | act.sa_handler = handler; | |
d482d2a3 UD |
43 | if (__sigemptyset (&act.sa_mask) < 0 |
44 | || __sigaddset (&act.sa_mask, sig) < 0) | |
28f540f4 | 45 | return SIG_ERR; |
df4ef2ab | 46 | act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART; |
28f540f4 RM |
47 | if (__sigaction (sig, &act, &oact) < 0) |
48 | return SIG_ERR; | |
49 | ||
50 | return oact.sa_handler; | |
51 | } | |
df4ef2ab UD |
52 | weak_alias (__bsd_signal, bsd_signal) |
53 | weak_alias (__bsd_signal, signal) | |
54 | weak_alias (__bsd_signal, ssignal) |