src/tests/mmap-cat.c

   1 /*
   2  * Copyright (c) 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 <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
  49 #include <err.h>
  50
  51 #ifndef MAP_FAILED
  52 #define MAP_FAILED ((void *)-1)
  53 #endif
  54
  55 static void
  56 doit_mmap(int fd, struct stat *sb)
  57 {
  58     void *mmap_buf;
  59     int ret;
  60
  61     mmap_buf = mmap(NULL, sb->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
  62     if (mmap_buf == (void *)MAP_FAILED)
  63         err(1, "mmap");
  64     ret = write(1, mmap_buf, sb->st_size);
  65     if (ret != sb->st_size)
  66         err(1, "write returned %d wanted to write %d", ret, (int)sb->st_size);
  67     munmap(mmap_buf, sb->st_size);
  68 }
  69
  70
  71 static void
  72 doit_read(int fd, struct stat *sb)
  73 {
  74     int ret;
  75     void *read_buf;
  76
  77     read_buf = malloc(sb->st_size);
  78     if (read_buf == NULL)
  79         err(1, "malloc(%d)", (int)sb->st_size);
  80     ret = read(fd, read_buf, sb->st_size);
  81     if (ret != sb->st_size)
  82         err(1, "read returned %d wanted to write %d", ret, (int)sb->st_size);
  83     ret = write(1, read_buf, sb->st_size);
  84     if (ret != sb->st_size)
  85         err(1, "write returned %d wanted to write %d", ret, (int)sb->st_size);
  86     free(read_buf);
  87 }
  88
  89 static void
  90 doit(const char *filename, void (*func) (int, struct stat *))
  91 {
  92     struct stat sb;
  93     int fd;
  94     int ret;
  95
  96     fd = open(filename, O_RDONLY);
  97     if (fd < 0)
  98         err(1, "open %s", filename);
  99     ret = fstat(fd, &sb);
 100     (*func) (fd, &sb);
 101     if (ret < 0)
 102         err(1, "stat %s", filename);
 103     close(fd);
 104 }
 105
 106 static int read_flag;
 107 static int mmap_flag;
 108
 109 static void
 110 usage(int exit_val)
 111 {
 112     fprintf(stderr, "mmap-cat [-m|-r] filename\n");
 113     exit(exit_val);
 114 }
 115
 116 int
 117 main(int argc, char **argv)
 118 {
 119     if (argc != 2)
 120         usage(1);
 121
 122     if (!strcmp(argv[1], "-m")) {
 123         mmap_flag++;
 124     } else if (!strcmp(argv[1], "-r")) {
 125         read_flag++;
 126     } else
 127         usage(1);
 128
 129     if (read_flag && mmap_flag)
 130         errx(1, "can't do both mmap and read");
 131
 132     if (read_flag)
 133         doit(argv[0], doit_read);
 134     if (mmap_flag)
 135         doit(argv[0], doit_mmap);
 136
 137     return 0;
 138 }