tests/mmap-and-read.c

   1 /*
   2  * Copyright (c) 1995 - 2001 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 <sys/types.h>
  41 #include <fcntl.h>
  42 #include <time.h>
  43 #include <unistd.h>
  44 #include <string.h>
  45 #include <sys/mman.h>
  46 #include <sys/stat.h>
  47 #include <err.h>
  48 #include <roken.h>
  49
  50 #ifdef RCSID
  51 RCSID("$Id$");
  52 #endif
  53
  54 #ifndef MAP_FAILED
  55 #define MAP_FAILED ((void *)-1)
  56 #endif
  57
  58 static char *
  59 generate_random_file (const char *filename,
  60                       unsigned npages,
  61                       unsigned pagesize,
  62                       int writep)
  63 {
  64     int fd;
  65     char *buf, *fbuf;
  66     int i;
  67     int prot;
  68     int flags;
  69     size_t sz = npages * pagesize;
  70
  71     buf = malloc (sz);
  72     if (buf == NULL)
  73         err (1, "malloc %u", (unsigned)sz);
  74
  75     for (i = 0; i < npages; ++i)
  76         memset (buf + pagesize * i, '0' + i, pagesize);
  77
  78     fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0666);
  79     if (fd < 0)
  80         err (1, "open %s", filename);
  81
  82     if (ftruncate (fd, sz) < 0)
  83         err (1, "ftruncate");
  84
  85     prot = PROT_READ | PROT_WRITE;
  86     flags = MAP_SHARED;
  87
  88     fbuf = mmap (0, sz, prot, flags, fd, 0);
  89     if (fbuf == (void *)MAP_FAILED)
  90         err (1, "mmap");
  91
  92     if (writep) {
  93         if(write(fd, "hej\n", 4) != 4)
  94             err(1, "write");
  95     }
  96
  97     memcpy (fbuf, buf, sz);
  98
  99 #if 0
 100     if (msync (fbuf, sz, MS_SYNC))
 101         err(1, "msync");
 102 #endif
 103
 104     if (munmap (fbuf, sz) != 0)
 105         err (1, "munmap");
 106
 107     if (close (fd))
 108         err (1, "close");
 109     return buf;
 110 }
 111
 112 static char *
 113 read_file (int fd, size_t sz)
 114 {
 115     char *buf;
 116     ssize_t ret;
 117
 118     buf = malloc (sz);
 119     if (buf == NULL)
 120         err (1, "malloc %u", (unsigned)sz);
 121     ret = read (fd, buf, sz);
 122     if (ret < 0)
 123         err (1, "read");
 124     if (ret != sz)
 125         errx(1, "short read %d < %u", (int)ret, (unsigned)sz);
 126     return buf;
 127 }
 128
 129 static int
 130 test (const char *file, int writep)
 131 {
 132     const size_t sz  = 4 * getpagesize();
 133     char *buf;
 134     char *malloc_buf;
 135     int fd;
 136     int ret;
 137
 138     buf = generate_random_file (file, 4, getpagesize(), writep);
 139
 140     fd = open (file, O_RDONLY, 0);
 141     if (fd < 0)
 142         err (1, "open %s", file);
 143
 144     malloc_buf = read_file (fd, sz);
 145     close (fd);
 146     ret = memcmp (buf, malloc_buf, sz);
 147     free (buf);
 148
 149     return ret;
 150 }
 151
 152
 153 int
 154 main (int argc, char **argv)
 155 {
 156
 157     setprogname (argv[0]);
 158
 159     srand (time(NULL));
 160
 161     if (test ("foo", 1) != 0)
 162         errx (1, "test(1)");
 163     if (test ("bar", 0) != 0)
 164         errx (1, "test(2)");
 165
 166     return 0;
 167 }