tests/test-null.c

   1 /* nbdkit
   2  * Copyright (C) 2017 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
  42 #include <guestfs.h>
  43
  44 #include "test.h"
  45
  46 static char data[257] =
  47   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
  48   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
  49   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
  50   "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
  51
  52 int
  53 main (int argc, char *argv[])
  54 {
  55   guestfs_h *g;
  56   int r;
  57   char *rdata;
  58   size_t rsize;
  59   size_t i;
  60
  61   if (test_start_nbdkit ("null", "100M", NULL) == -1)
  62     exit (EXIT_FAILURE);
  63
  64   g = guestfs_create ();
  65   if (g == NULL) {
  66     perror ("guestfs_create");
  67     exit (EXIT_FAILURE);
  68   }
  69
  70   r = guestfs_add_drive_opts (g, "",
  71                               GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
  72                               GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd",
  73                               GUESTFS_ADD_DRIVE_OPTS_SERVER, server,
  74                               -1);
  75   if (r == -1)
  76     exit (EXIT_FAILURE);
  77
  78   if (guestfs_launch (g) == -1)
  79     exit (EXIT_FAILURE);
  80
  81   /* All writes should read back as zeroes.  However we have to
  82    * reopen the handle to stop the libguestfs kernel from caching
  83    * the written data.
  84    */
  85   if (guestfs_pwrite_device (g, "/dev/sda", data, 256, 1024) == -1)
  86     exit (EXIT_FAILURE);
  87
  88   if (guestfs_shutdown (g) == -1)
  89     exit (EXIT_FAILURE);
  90
  91   guestfs_close (g);
  92
  93   g = guestfs_create ();
  94   if (g == NULL) {
  95     perror ("guestfs_create");
  96     exit (EXIT_FAILURE);
  97   }
  98
  99   r = guestfs_add_drive_opts (g, "",
 100                               GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
 101                               GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd",
 102                               GUESTFS_ADD_DRIVE_OPTS_SERVER, server,
 103                               -1);
 104   if (r == -1)
 105     exit (EXIT_FAILURE);
 106
 107   if (guestfs_launch (g) == -1)
 108     exit (EXIT_FAILURE);
 109
 110   rdata = guestfs_pread_device (g, "/dev/sda", 2048, 0, &rsize);
 111   if (rdata == NULL)
 112     exit (EXIT_FAILURE);
 113   if (rsize != 2048) {
 114     fprintf (stderr, "test-null: short read\n");
 115     exit (EXIT_FAILURE);
 116   }
 117
 118   for (i = 0; i < 2048; ++i) {
 119     if (rdata[i] != 0) {
 120       fprintf (stderr, "test-null: unexpected non-zero data read\n");
 121       exit (EXIT_FAILURE);
 122     }
 123   }
 124   free (rdata);
 125
 126   if (guestfs_shutdown (g) == -1)
 127     exit (EXIT_FAILURE);
 128
 129   guestfs_close (g);
 130   exit (EXIT_SUCCESS);
 131 }