tests/mmap-vs-read2.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 static int debug = 0;
  55
  56 static void
  57 generate_file (const char *filename, int randomp, size_t sz)
  58 {
  59     int fd;
  60     char *buf;
  61     int i;
  62
  63     buf = malloc (sz);
  64     if (buf == NULL)
  65         err (1, "malloc %u", (unsigned)sz);
  66
  67     fd = open (filename, O_WRONLY | O_CREAT, 0666);
  68     if (fd < 0)
  69         err (1, "open %s", filename);
  70
  71     for (i = 0; i < sz; ++i)
  72         if (randomp)
  73             buf[i] = rand();
  74         else
  75             buf[0] = 0;
  76
  77     if (write (fd, buf, sz) != sz)
  78         err (1, "write");
  79     if (close (fd))
  80         err (1, "close");
  81     free (buf);
  82 }
  83
  84 static unsigned char *
  85 read_file (int fd, size_t sz)
  86 {
  87     unsigned char *buf;
  88     ssize_t ret;
  89
  90     buf = malloc (sz);
  91     if (buf == NULL)
  92         err (1, "malloc %u", (unsigned)sz);
  93     ret = read(fd, buf, sz);
  94     if(ret < 0)
  95         err(1, "read");
  96     if (ret != sz)
  97         errx(1, "short read %d < %u", (int)ret, (unsigned)sz);
  98     return buf;
  99 }
 100
 101 #ifndef MAP_FAILED
 102 #define MAP_FAILED ((void *)-1)
 103 #endif
 104
 105 static void *
 106 mmap_file (int fd, size_t sz)
 107 {
 108     void *ret;
 109
 110     ret = mmap (0, sz, PROT_READ, MAP_PRIVATE, fd, 0);
 111     if (ret == (void *)MAP_FAILED)
 112         err (1, "mmap");
 113     return ret;
 114 }
 115
 116 static void __attribute__ ((__unused__))
 117 print_area (unsigned char *ptr,  size_t len)
 118 {
 119     while (len--) {
 120         printf ("%x", *ptr);
 121         ptr++;
 122     }
 123 }
 124
 125 static int
 126 do_test (int randomp)
 127 {
 128     unsigned char *malloc_buf;
 129     void *mmap_buf;
 130     int fd;
 131     const char *file = "foo";
 132     const size_t sz  = 3 * getpagesize() / 2;
 133
 134     generate_file (file, randomp, sz);
 135
 136     fd = open (file, O_RDONLY, 0);
 137     if (fd < 0)
 138         err (1, "open %s", file);
 139
 140     mmap_buf   = mmap_file (fd, sz);
 141     malloc_buf = read_file (fd, sz);
 142     close (fd);
 143     unlink (file);
 144     if (memcmp (malloc_buf, mmap_buf, sz) != 0) {
 145         if (debug) {
 146             printf ("type: %s\n", randomp ? "random" : "allzero");
 147             printf ("read: ");
 148             print_area (malloc_buf, sz);
 149             printf ("\nmmap: ");
 150             print_area (mmap_buf, sz);
 151             printf ("\n");
 152         }
 153         return 1;
 154     }
 155     return 0;
 156 }
 157
 158 int
 159 main (int argc, char **argv)
 160 {
 161     setprogname (argv[0]);
 162
 163     if (argc != 1)
 164         debug = 1;
 165
 166     srand (time(NULL));
 167
 168     if (do_test (0))
 169         return 1;
 170     if (do_test (1))
 171         return 2;
 172
 173     return 0;
 174 }