tests/test.c

   1 /* nbdkit
   2  * Copyright (C) 2013 Red Hat Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  * * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *
  12  * * Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  *
  16  * * Neither the name of Red Hat nor the names of its contributors may be
  17  * used to endorse or promote products derived from this software without
  18  * specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  27  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  28  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <stdarg.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41 #include <sys/types.h>
  42 #include <sys/wait.h>
  43 #include <signal.h>
  44 #include <errno.h>
  45
  46 #include "test.h"
  47
  48 static char tmpdir[] = "/tmp/nbdkitXXXXXX";
  49 static char sockpath[] = "/tmp/nbdkitXXXXXX/sock";
  50 static char unixsockpath[] = "unix:/tmp/nbdkitXXXXXX/sock";
  51 static char pidpath[] = "/tmp/nbdkitXXXXXX/pid";
  52
  53 pid_t pid = 0;
  54 const char *server[2] = { unixsockpath, NULL };
  55
  56 static void
  57 cleanup (void)
  58 {
  59   if (pid > 0)
  60     kill (pid, SIGTERM);
  61
  62   unlink (pidpath);
  63   unlink (sockpath);
  64   rmdir (tmpdir);
  65 }
  66
  67 int
  68 test_start_nbdkit (const char *plugin, ...)
  69 {
  70   size_t i, len;
  71
  72   if (mkdtemp (tmpdir) == NULL) {
  73     perror ("mkdtemp");
  74     return -1;
  75   }
  76   len = strlen (tmpdir);
  77   memcpy (sockpath, tmpdir, len);
  78   memcpy (unixsockpath+5, tmpdir, len);
  79   memcpy (pidpath, tmpdir, len);
  80
  81   pid = fork ();
  82   if (pid == 0) {               /* Child (nbdkit). */
  83     const char *p;
  84     const int MAX_ARGS = 64;
  85     const char *argv[MAX_ARGS+1];
  86     va_list args;
  87
  88     argv[0] = "nbdkit";
  89     argv[1] = "-U";
  90     argv[2] = sockpath;
  91     argv[3] = "-P";
  92     argv[4] = pidpath;
  93     argv[5] = "-f";
  94     argv[6] = plugin;
  95     i = 7;
  96
  97     va_start (args, plugin);
  98     while ((p = va_arg (args, const char *)) != NULL) {
  99       if (i >= MAX_ARGS)
 100         abort ();
 101       argv[i] = p;
 102       ++i;
 103     }
 104     va_end (args);
 105     argv[i] = NULL;
 106
 107     execvp ("../src/nbdkit", (char **) argv);
 108     perror ("exec: nbdkit");
 109     _exit (EXIT_FAILURE);
 110   }
 111
 112   /* Ensure nbdkit is killed and temporary files are deleted when the
 113    * main program exits.
 114    */
 115   atexit (cleanup);
 116
 117   /* Wait for the pidfile to turn up, which indicates that nbdkit has
 118    * started up successfully and is ready to serve requests.  However
 119    * if 'pid' exits in this time it indicates a failure to start up.
 120    * Also there is a timeout in case nbdkit hangs.
 121    */
 122   for (i = 0; i < NBDKIT_START_TIMEOUT; ++i) {
 123     if (waitpid (pid, NULL, WNOHANG) == pid)
 124       goto early_exit;
 125
 126     if (kill (pid, 0) == -1) {
 127       if (errno == ESRCH) {
 128       early_exit:
 129         fprintf (stderr,
 130                  "%s FAILED: nbdkit exited before starting to serve files\n",
 131                  program_name);
 132         pid = 0;
 133         return -1;
 134       }
 135       perror ("kill");
 136     }
 137
 138     if (access (pidpath, F_OK) == 0)
 139       break;
 140
 141     sleep (1);
 142   }
 143
 144   return 0;
 145 }