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added check to get rid of segfault

/*
 *
 * Copyright (c) 2003 The Regents of the University of California.  All 
 * rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Neither the name of the University nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <netdb.h>
#include <libmisc/misc.h>
#include <libmisc/elog.h>
#include <libmisc/misc_network.h>
#include <libmisc/queue.h>
#include <emrun/emrun.h>
#include <fusd.h>

#define __GNU_SOURCE
#include <getopt.h>


void usage(char *name)
{
  fprintf(stderr, 
	  "%s: %s <fusd URL>\n"
	  "Connects to the remote host and instantiates a local stub device\n"
	  "URL syntax:  fusd://hostname/path[=local-device]\n"
	  "  --remap: remap the stub device into the main device tree\n"
	  , name, name);
  exit(1);
}


static void fnc_shutdown(void *data)
{
  fusdd_client_context_t *fnc = (fusdd_client_context_t*)data;
  elog(LOG_NOTICE, "fusdnet_client (connected to '%s') shutting down...",
       fusdd_proxy_get_url(fnc));
  fusdd_proxy_destroy(fnc);
  exit(0);
}


int main(int argc, char **argv)
{
  fusdd_client_context_t *fnc = NULL;
 
  /* generic init */
  misc_init(&argc, argv, CVSTAG);

  int remap = misc_parse_out_switch(&argc, argv, "remap", 0);

  while (1) {
    int c;
    int option_index = 0;
    static struct option long_options[] = {
      {"help", 0, 0, 'h'},
      {0, 0, 0, 0}
    };
    
    c = getopt_long (argc, argv, "h",
		     long_options, &option_index);
    if (c == -1)
      break;

    switch (c) {
    default:
    case '?':
    case 'h':
      usage(argv[0]);
      break;
    }
  }

  /* grab the url arg */
  char *url = argv[optind];
  char *host = NULL;
  char *remote = NULL;
  char *local = NULL;
  

  if (url == NULL) 
    usage(argv[0]);

  if (fusdd_parse_url(&host, &remote, &local, url) < 0) {
    elog(LOG_CRIT, "Invalid URL syntax: %s", url);
    exit(1);
  }

  /* if remap, copy over */
  if (remap) {
    if (local) free(local);
    local = strdup(remote);
  }

  /* prepend /dev to local if needed */
  if (local && strncmp("/dev/", local, 5)) {
    char tmp[256];
    sprintf(tmp, "/dev/%s", local);
    if (local) free(local);
    local = strdup(tmp);
  }

  /* try to connect */
  if (fusdd_proxy_connect(host, remote, local ? sim_path(local) : NULL, &fnc) < 0) {
    elog(LOG_CRIT, "Failed to connect to %s: %m", url);
    exit(1);
  }
  
  /* connect to emrun */
  emrun_opts_t emrun_opts = {
    shutdown: fnc_shutdown,  /* this function implements our shutdown handler */
    data: fnc                /* this pointer will be passed to our shutdown handler */
  };
  emrun_init(&emrun_opts);
  
  /* event loop */
  g_main();
  elog(LOG_ERR,"Irregular termination!\n");
  return 1;
}