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fuse_signals.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>

  This program can be distributed under the terms of the GNU LGPLv2.
  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("fuse: cannot set signal handler");
            return -1;
      }
      return 0;
}

00047 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;
}

00059 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);
}


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