| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu> |
| |
| Utility functions for setting signal handlers. |
| |
| This program can be distributed under the terms of the GNU LGPLv2. |
| See the file COPYING.LIB |
| */ |
| |
| #include "config.h" |
| #include "fuse_lowlevel.h" |
| #include "fuse_i.h" |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| |
| static struct fuse_session *fuse_instance; |
| |
| static void exit_handler(int sig) |
| { |
| (void) sig; |
| if (fuse_instance) { |
| fuse_session_exit(fuse_instance); |
| if(sig <= 0) { |
| fprintf(stderr, "assertion error: signal value <= 0\n"); |
| abort(); |
| } |
| fuse_instance->error = sig; |
| } |
| } |
| |
| static int set_one_signal_handler(int sig, void (*handler)(int), int remove) |
| { |
| struct sigaction sa; |
| struct sigaction old_sa; |
| |
| memset(&sa, 0, sizeof(struct sigaction)); |
| sa.sa_handler = remove ? SIG_DFL : handler; |
| sigemptyset(&(sa.sa_mask)); |
| sa.sa_flags = 0; |
| |
| if (sigaction(sig, NULL, &old_sa) == -1) { |
| perror("fuse: cannot get old signal handler"); |
| return -1; |
| } |
| |
| if (old_sa.sa_handler == (remove ? handler : SIG_DFL) && |
| sigaction(sig, &sa, NULL) == -1) { |
| perror("fuse: cannot set signal handler"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int fuse_set_signal_handlers(struct fuse_session *se) |
| { |
| if (set_one_signal_handler(SIGHUP, exit_handler, 0) == -1 || |
| set_one_signal_handler(SIGINT, exit_handler, 0) == -1 || |
| set_one_signal_handler(SIGTERM, exit_handler, 0) == -1 || |
| set_one_signal_handler(SIGPIPE, SIG_IGN, 0) == -1) |
| return -1; |
| |
| fuse_instance = se; |
| return 0; |
| } |
| |
| void fuse_remove_signal_handlers(struct fuse_session *se) |
| { |
| if (fuse_instance != se) |
| fprintf(stderr, |
| "fuse: fuse_remove_signal_handlers: unknown session\n"); |
| else |
| fuse_instance = NULL; |
| |
| set_one_signal_handler(SIGHUP, exit_handler, 1); |
| set_one_signal_handler(SIGINT, exit_handler, 1); |
| set_one_signal_handler(SIGTERM, exit_handler, 1); |
| set_one_signal_handler(SIGPIPE, SIG_IGN, 1); |
| } |