blob: bf979563268b7dde9d2acaae597697718d0fd674
| 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 | |
| 18 | static void exit_handler(int sig) |
| 19 | { |
| 20 | (void) sig; |
| 21 | if (fuse_instance) |
| 22 | fuse_session_exit(fuse_instance); |
| 23 | } |
| 24 | |
| 25 | static int set_one_signal_handler(int sig, void (*handler)(int)) |
| 26 | { |
| 27 | struct sigaction sa; |
| 28 | struct sigaction old_sa; |
| 29 | |
| 30 | memset(&sa, 0, sizeof(struct sigaction)); |
| 31 | sa.sa_handler = 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 == SIG_DFL && |
| 41 | sigaction(sig, &sa, NULL) == -1) { |
| 42 | perror("fuse: cannot set signal handler"); |
| 43 | return -1; |
| 44 | } |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | int fuse_set_signal_handlers(struct fuse_session *se) |
| 49 | { |
| 50 | if (set_one_signal_handler(SIGHUP, exit_handler) == -1 || |
| 51 | set_one_signal_handler(SIGINT, exit_handler) == -1 || |
| 52 | set_one_signal_handler(SIGTERM, exit_handler) == -1 || |
| 53 | set_one_signal_handler(SIGPIPE, SIG_IGN) == -1) |
| 54 | return -1; |
| 55 | |
| 56 | fuse_instance = se; |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 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, SIG_DFL); |
| 69 | set_one_signal_handler(SIGINT, SIG_DFL); |
| 70 | set_one_signal_handler(SIGTERM, SIG_DFL); |
| 71 | set_one_signal_handler(SIGPIPE, SIG_DFL); |
| 72 | } |
| 73 | |
| 74 |