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