src/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
  49 static int debug = 0;
  50
  51 static void
  52 generate_file(const char *filename, int randomp, size_t sz)
  53 {
  54     int fd;
  55     char *buf;
  56     int i;
  57
  58     buf = malloc(sz);
  59     if (buf == NULL)
  60         err(1, "malloc %u", (unsigned)sz);
  61
  62     fd = open(filename, O_WRONLY | O_CREAT, 0666);
  63     if (fd < 0)
  64         err(1, "open %s", filename);
  65
  66     for (i = 0; i < sz; ++i)
  67         if (randomp)
  68             buf[i] = rand();
  69         else
  70             buf[0] = 0;
  71
  72     if (write(fd, buf, sz) != sz)
  73         err(1, "write");
  74     if (close(fd))
  75         err(1, "close");
  76     free(buf);
  77 }
  78
  79 static unsigned char *
  80 read_file(int fd, size_t sz)
  81 {
  82     unsigned char *buf;
  83     ssize_t ret;
  84
  85     buf = malloc(sz);
  86     if (buf == NULL)
  87         err(1, "malloc %u", (unsigned)sz);
  88     ret = read(fd, buf, sz);
  89     if (ret < 0)
  90         err(1, "read");
  91     if (ret != sz)
  92         errx(1, "short read %d < %u", (int)ret, (unsigned)sz);
  93     return buf;
  94 }
  95
  96 #ifndef MAP_FAILED
  97 #define MAP_FAILED ((void *)-1)
  98 #endif
  99
 100 static void *
 101 mmap_file(int fd, size_t sz)
 102 {
 103     void *ret;
 104
 105     ret = mmap(0, sz, PROT_READ, MAP_PRIVATE, fd, 0);
 106     if (ret == (void *)MAP_FAILED)
 107         err(1, "mmap");
 108     return ret;
 109 }
 110
 111 static void __attribute__ ((__unused__))
 112     print_area(unsigned char *ptr, size_t len)
 113 {
 114     while (len--) {
 115         printf("%x", *ptr);
 116         ptr++;
 117     }
 118 }
 119
 120 static int
 121 do_test(int randomp)
 122 {
 123     unsigned char *malloc_buf;
 124     void *mmap_buf;
 125     int fd;
 126     const char *file = "foo";
 127     const size_t sz = 3 * getpagesize() / 2;
 128
 129     generate_file(file, randomp, sz);
 130
 131     fd = open(file, O_RDONLY, 0);
 132     if (fd < 0)
 133         err(1, "open %s", file);
 134
 135     mmap_buf = mmap_file(fd, sz);
 136     malloc_buf = read_file(fd, sz);
 137     close(fd);
 138     unlink(file);
 139     if (memcmp(malloc_buf, mmap_buf, sz) != 0) {
 140         if (debug) {
 141             printf("type: %s\n", randomp ? "random" : "allzero");
 142             printf("read: ");
 143             print_area(malloc_buf, sz);
 144             printf("\nmmap: ");
 145             print_area(mmap_buf, sz);
 146             printf("\n");
 147         }
 148         return 1;
 149     }
 150     return 0;
 151 }
 152
 153 int
 154 main(int argc, char **argv)
 155 {
 156
 157     if (argc != 1)
 158         debug = 1;
 159
 160     srand(time(NULL));
 161
 162     if (do_test(0))
 163         return 1;
 164     if (do_test(1))
 165         return 2;
 166
 167     return 0;
 168 }