tests/write-error.c

   1 /*
   2  * Copyright (c) 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <errno.h>
  42
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <sys/mman.h>
  46 #include <fcntl.h>
  47 #include <unistd.h>
  48 #include <dirent.h>
  49
  50 #include <roken.h>
  51
  52 #include <err.h>
  53
  54 #ifndef MAP_FAILED
  55 #define MAP_FAILED ((void *)-1)
  56 #endif
  57
  58 RCSID("$Id$");
  59
  60 static void
  61 doit (const char *filename)
  62 {
  63     size_t sz = getpagesize();
  64     int fd;
  65     int ret;
  66     void *buf;
  67
  68     fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);
  69     if (fd < 0)
  70         err (1, "open %s", filename);
  71 #ifdef MAP_ANON
  72     buf = mmap (NULL, sz, PROT_READ|PROT_WRITE,
  73                      MAP_ANON|MAP_PRIVATE, -1, 0);
  74 #else
  75     {
  76         int fd;
  77
  78         fd = open ("/dev/zero", O_RDWR);
  79         if (fd < 0)
  80             err (1, "open /dev/zero");
  81         buf = mmap (NULL, sz, PROT_READ | PROT_WRITE,
  82                     MAP_PRIVATE, fd, 0);
  83         close (fd);
  84     }
  85 #endif
  86     ret = munmap (buf, sz);
  87     if (ret < 0)
  88         err (1, "munmap %s", filename);
  89
  90     ret = write(fd, buf, 1);
  91     if (ret != -1)
  92         err (1, "write did not fail %s", filename);
  93
  94     ret = close (fd);
  95     if (ret < 0)
  96         err (1, "close %s", filename);
  97 }
  98
  99 int
 100 main(int argc, char **argv)
 101 {
 102     const char *file = "foo";
 103
 104     setprogname (argv[0]);
 105     if (argc != 1 && argc != 2)
 106         errx (1, "usage: %s [file]", argv[0]);
 107     if (argc == 2)
 108         file = argv[1];
 109     doit (file);
 110     return 0;
 111 }