1 /*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
4
5 This program can be distributed under the terms of the GNU LGPLv2.
6 See the file COPYING.LIB
7 */
8
9 #include "config.h"
10 #include "fuse_lowlevel.h"
11
12 #include <stdio.h>
13 #include <string.h>
14 #include <signal.h>
15
16 static struct fuse_session *fuse_instance;
17
exit_handler(int sig)18 static void exit_handler(int sig)
19 {
20 (void) sig;
21 if (fuse_instance)
22 fuse_session_exit(fuse_instance);
23 }
24
set_one_signal_handler(int sig,void (* handler)(int),int remove)25 static int set_one_signal_handler(int sig, void (*handler)(int), int remove)
26 {
27 struct sigaction sa;
28 struct sigaction old_sa;
29
30 memset(&sa, 0, sizeof(struct sigaction));
31 sa.sa_handler = remove ? SIG_DFL : handler;
32 sigemptyset(&(sa.sa_mask));
33 sa.sa_flags = 0;
34
35 if (sigaction(sig, NULL, &old_sa) == -1) {
36 perror("fuse: cannot get old signal handler");
37 return -1;
38 }
39
40 if (old_sa.sa_handler == (remove ? handler : SIG_DFL) &&
41 sigaction(sig, &sa, NULL) == -1) {
42 perror("fuse: cannot set signal handler");
43 return -1;
44 }
45 return 0;
46 }
47
fuse_set_signal_handlers(struct fuse_session * se)48 int fuse_set_signal_handlers(struct fuse_session *se)
49 {
50 if (set_one_signal_handler(SIGHUP, exit_handler, 0) == -1 ||
51 set_one_signal_handler(SIGINT, exit_handler, 0) == -1 ||
52 set_one_signal_handler(SIGTERM, exit_handler, 0) == -1 ||
53 set_one_signal_handler(SIGPIPE, SIG_IGN, 0) == -1)
54 return -1;
55
56 fuse_instance = se;
57 return 0;
58 }
59
fuse_remove_signal_handlers(struct fuse_session * se)60 void fuse_remove_signal_handlers(struct fuse_session *se)
61 {
62 if (fuse_instance != se)
63 fprintf(stderr,
64 "fuse: fuse_remove_signal_handlers: unknown session\n");
65 else
66 fuse_instance = NULL;
67
68 set_one_signal_handler(SIGHUP, exit_handler, 1);
69 set_one_signal_handler(SIGINT, exit_handler, 1);
70 set_one_signal_handler(SIGTERM, exit_handler, 1);
71 set_one_signal_handler(SIGPIPE, SIG_IGN, 1);
72 }
73
74