tests/test-delay.c

   1 /* nbdkit
   2  * Copyright (C) 2018-2019 Red Hat Inc.
   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 <stdint.h>
  38 #include <inttypes.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41 #include <time.h>
  42
  43 #include <libnbd.h>
  44
  45 int
  46 main (int argc, char *argv[])
  47 {
  48   struct nbd_handle *nbd;
  49   int i;
  50   time_t start_t, end_t;
  51   char data[512];
  52
  53   nbd = nbd_create ();
  54   if (nbd == NULL) {
  55     fprintf (stderr, "%s\n", nbd_get_error ());
  56     exit (EXIT_FAILURE);
  57   }
  58
  59   char *args[] = {
  60     "nbdkit", "-s", "--exit-with-parent",
  61     "--filter", "delay",
  62     "memory", "1M",
  63     "wdelay=10", NULL
  64   };
  65   if (nbd_connect_command (nbd, args) == -1) {
  66     fprintf (stderr, "%s\n", nbd_get_error ());
  67     exit (EXIT_FAILURE);
  68   }
  69
  70   /* Reads should work as normal.  Do lots of small reads here so
  71    * we will notice if they are being delayed.
  72    */
  73   for (i = 0; i < 100; ++i) {
  74     if (nbd_pread (nbd, data, sizeof data, 51200-512*i, 0) == -1) {
  75       fprintf (stderr, "%s\n", nbd_get_error ());
  76       exit (EXIT_FAILURE);
  77     }
  78   }
  79
  80   /* Writes should be delayed by >= 10 seconds. */
  81   time (&start_t);
  82   if (nbd_pwrite (nbd, "hello", 5, 100000, 0) == -1) {
  83     fprintf (stderr, "%s\n", nbd_get_error ());
  84     exit (EXIT_FAILURE);
  85   }
  86   time (&end_t);
  87
  88   if (end_t - start_t < 10) {
  89     fprintf (stderr, "%s FAILED: no write delay detected\n", argv[0]);
  90     exit (EXIT_FAILURE);
  91   }
  92
  93   nbd_close (nbd);
  94   exit (EXIT_SUCCESS);
  95 }