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 "fuse_lowlevel.h" 10 11 #include <stdio.h> 12 #include <string.h> 13 #include <signal.h> 14 15 static struct fuse_session *fuse_instance; 16 17 static void exit_handler(int sig) 18 { 19 (void) sig; 20 if (fuse_instance) 21 fuse_session_exit(fuse_instance); 22 } 23 24 static int set_one_signal_handler(int sig, void (*handler)(int), int remove) 25 { 26 struct sigaction sa; 27 struct sigaction old_sa; 28 29 memset(&sa, 0, sizeof(struct sigaction)); 30 sa.sa_handler = remove ? SIG_DFL : handler; 31 sigemptyset(&(sa.sa_mask)); 32 sa.sa_flags = 0; 33 34 if (sigaction(sig, NULL, &old_sa) == -1) { 35 perror("fuse: cannot get old signal handler"); 36 return -1; 37 } 38 39 if (old_sa.sa_handler == (remove ? handler : SIG_DFL) && 40 sigaction(sig, &sa, NULL) == -1) { 41 perror("fuse: cannot set signal handler"); 42 return -1; 43 } 44 return 0; 45 } 46 47 int fuse_set_signal_handlers(struct fuse_session *se) 48 { 49 if (set_one_signal_handler(SIGHUP, exit_handler, 0) == -1 || 50 set_one_signal_handler(SIGINT, exit_handler, 0) == -1 || 51 set_one_signal_handler(SIGTERM, exit_handler, 0) == -1 || 52 set_one_signal_handler(SIGPIPE, SIG_IGN, 0) == -1) 53 return -1; 54 55 fuse_instance = se; 56 return 0; 57 } 58 59 void fuse_remove_signal_handlers(struct fuse_session *se) 60 { 61 if (fuse_instance != se) 62 fprintf(stderr, 63 "fuse: fuse_remove_signal_handlers: unknown session\n"); 64 else 65 fuse_instance = NULL; 66 67 set_one_signal_handler(SIGHUP, exit_handler, 1); 68 set_one_signal_handler(SIGINT, exit_handler, 1); 69 set_one_signal_handler(SIGTERM, exit_handler, 1); 70 set_one_signal_handler(SIGPIPE, SIG_IGN, 1); 71 } 72 73