/*    FUSE: Filesystem in Userspace    Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>    This program can be distributed under the terms of the GNU LGPL.    See the file COPYING.LIB*/#include "fuse_lowlevel.h"#include <stdio.h>#include <string.h>#include <signal.h>static struct fuse_session *fuse_instance;static void exit_handler(int sig){    (void) sig;    if (fuse_instance)        fuse_session_exit(fuse_instance);}static int set_one_signal_handler(int sig, void (*handler)(int)){    struct sigaction sa;    struct sigaction old_sa;    memset(&sa, 0, sizeof(struct sigaction));    sa.sa_handler = 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 == SIG_DFL &&        sigaction(sig, &sa, NULL) == -1) {        perror("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) == -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)        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, SIG_DFL);    set_one_signal_handler(SIGINT, SIG_DFL);    set_one_signal_handler(SIGTERM, SIG_DFL);    set_one_signal_handler(SIGPIPE, SIG_DFL);}