tests/test-exitwhen-pipe-closed.c

   1 /* nbdkit
   2  * Copyright Red Hat
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <config.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <unistd.h>
  38 #include <signal.h>
  39
  40 int
  41 main (int argc, char *argv[])
  42 {
  43   char *param;
  44   int fd[2];
  45   pid_t pid;
  46
  47 #ifdef WIN32
  48   fprintf (stderr, "%s: test skipped on Windows: no pipe(2)\n", argv[0]);
  49   exit (77);
  50 #endif
  51
  52 #ifdef __APPLE__
  53   /* XXX Fix this. */
  54   fprintf (stderr, "%s: test skipped on macOS because the test hangs\n",
  55            argv[0]);
  56   exit (77);
  57 #endif
  58
  59   if (pipe (fd) == -1) {
  60     perror ("pipe");
  61     exit (EXIT_FAILURE);
  62   }
  63   if (asprintf (&param, "exit-when-pipe-closed=%d", fd[0]) == -1) {
  64     perror ("asprintf");
  65     exit (EXIT_FAILURE);
  66   }
  67
  68   /* Run nbdkit. */
  69   pid = fork ();
  70   if (pid == -1) {
  71     perror ("fork");
  72     exit (EXIT_FAILURE);
  73   }
  74   if (pid == 0) {               /* Child - run nbdkit. */
  75     /* Close the write side of the pipe. */
  76     close (fd[1]);
  77
  78     /* Run nbdkit. */
  79     execlp ("nbdkit", "nbdkit", "-v", "--filter=exitwhen",
  80             "null", "1M", param, "exit-when-poll=1",
  81             NULL);
  82     perror ("execvp");
  83     _exit (EXIT_FAILURE);
  84   }
  85   free (param);
  86
  87   /* Close the read side of the pipe (this does NOT cause nbdkit to exit). */
  88   close (fd[0]);
  89
  90   /* Wait a bit. */
  91   sleep (2);
  92
  93   /* nbdkit should still be running. */
  94   if (kill (pid, 0) != 0) {
  95     fprintf (stderr, "FAIL: %s: nbdkit exited before pipe was closed\n",
  96              argv[0]);
  97     exit (EXIT_FAILURE);
  98   }
  99
 100   /* The test here is simply that nbdkit exits because we exit and our
 101    * side of the pipe is closed.
 102    */
 103   exit (EXIT_SUCCESS);
 104 }