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 <roken.h>
  50 #include <agetarg.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_mmap(int fd, struct stat *sb)
  62 {
  63     void *mmap_buf;
  64     int ret;
  65
  66     mmap_buf = mmap (NULL, sb->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
  67     if (mmap_buf == (void *)MAP_FAILED)
  68         err (1, "mmap");
  69     ret = write (STDOUT_FILENO, mmap_buf, sb->st_size);
  70     if (ret != sb->st_size)
  71         err(1, "write returned %d wanted to write %d",
  72             ret, (int)sb->st_size);
  73     munmap(mmap_buf, sb->st_size);
  74 }
  75
  76
  77 static void
  78 doit_read(int fd, struct stat *sb)
  79 {
  80     int ret;
  81     void *read_buf;
  82
  83     read_buf = malloc(sb->st_size);
  84     if (read_buf == NULL)
  85         err(1, "malloc(%d)", (int)sb->st_size);
  86     ret = read(fd, read_buf, sb->st_size);
  87     if (ret != sb->st_size)
  88         err(1, "read returned %d wanted to write %d",
  89             ret, (int)sb->st_size);
  90     ret = write (STDOUT_FILENO, read_buf, sb->st_size);
  91     if (ret != sb->st_size)
  92         err(1, "write returned %d wanted to write %d",
  93             ret, (int)sb->st_size);
  94     free(read_buf);
  95 }
  96
  97 static void
  98 doit (const char *filename, void (*func)(int, struct stat *))
  99 {
 100     struct stat sb;
 101     int fd;
 102     int ret;
 103
 104     fd = open (filename, O_RDONLY);
 105     if (fd < 0)
 106         err(1, "open %s", filename);
 107     ret = fstat (fd, &sb);
 108     (*func)(fd, &sb);
 109     if (ret < 0)
 110         err (1, "stat %s", filename);
 111     close (fd);
 112 }
 113
 114 static int read_flag;
 115 static int mmap_flag;
 116 static int help_flag;
 117
 118 static struct agetargs args[] = {
 119     {"read", 'r',       aarg_flag,      &read_flag,     "read", NULL},
 120     {"mmap", 'm',       aarg_flag,      &mmap_flag,     "mmap", NULL},
 121     {"help",    0,      aarg_flag,      &help_flag,     NULL,           NULL},
 122     {NULL,      0,      aarg_end,       NULL,           NULL,           NULL}
 123 };
 124
 125 static void
 126 usage (int exit_val)
 127 {
 128     aarg_printusage (args, NULL, "filename", AARG_AFSSTYLE);
 129     exit (exit_val);
 130 }
 131
 132 int
 133 main(int argc, char **argv)
 134 {
 135     int optind = 0;
 136
 137     setprogname (argv[0]);
 138
 139     if (argc < 2)
 140         usage(1);
 141
 142     if (agetarg (args, argc - 1, argv, &optind, AARG_AFSSTYLE))
 143         usage (1);
 144
 145     argc -= optind;
 146     argv += optind;
 147
 148     if (help_flag)
 149         usage(0);
 150
 151     if (argc != 1)
 152         usage(1);
 153
 154     if (read_flag && mmap_flag)
 155         errx(1, "can't do both mmap and read");
 156
 157     if (read_flag)
 158         doit(argv[0], doit_read);
 159     if (mmap_flag)
 160         doit(argv[0], doit_mmap);
 161
 162     return 0;
 163 }