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
|
/*
Interrupt handling to stop watching or locking variables.
This file is part of libscanmem.
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INTERRUPT_H
#define INTERRUPT_H
#ifndef _GNU_SOURCE
# define _GNU_SOURCE /* for sighandler_t */
#endif
#include <setjmp.h>
#include <signal.h>
/* small header file to manage interrupted commands */
static sigjmp_buf jmpbuf; /* used when aborting a command due to an interrupt */
static sighandler_t oldsig; /* reinstalled before longjmp */
static unsigned intused;
/* signal handler used to handle an interrupt during commands */
static void interrupted(int n)
{
(void) n;
siglongjmp(jmpbuf, 1);
}
#define INTERRUPTABLE() ((oldsig = signal(SIGINT, interrupted)), intused = 1, sigsetjmp(jmpbuf, 1))
#define ENDINTERRUPTABLE() (intused ? ((void) signal(SIGINT, oldsig), intused = 0) : (intused = 0))
#endif /* INTERRUPT_H */
|
