tests/write-link.c

   1 /*
   2  * Copyright (c) 2006-2007 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 <sys/stat.h>
  42 #include <fcntl.h>
  43 #include <unistd.h>
  44
  45 #include <roken.h>
  46 #include <err.h>
  47
  48 RCSID("$Id$");
  49
  50 #define BUF_SIZE        (64 * 1024)
  51 #define FILE_SIZE       (9 * BUF_SIZE)
  52
  53 /*
  54  * check that link() doesn't cause statinfo to be corrupted/reverted
  55  * for dirty file.
  56  */
  57
  58 static void
  59 doit(const char *filename, const char *linkname)
  60 {
  61     ssize_t bytes = 0;
  62     struct stat sb;
  63     off_t offset;
  64     int fd, ret;
  65
  66     char *buf = malloc(BUF_SIZE);
  67     if (!buf)
  68         err(1, "malloc failed");
  69
  70     fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT, 0666);
  71     if (fd < 0)
  72         err(1, "open %s", filename);
  73
  74     for (offset = 0; offset < FILE_SIZE; offset += bytes) {
  75         bytes = write(fd, buf, BUF_SIZE);
  76         if (bytes != BUF_SIZE)
  77             err(1, "write at %llu", (unsigned long long)offset);
  78     }
  79
  80     ret = link(filename, linkname);
  81     if (ret < 0)
  82         err (1, "link");
  83
  84     ret = lstat(linkname, &sb);
  85     if (ret < 0)
  86         err (1, "stat");
  87
  88     if (sb.st_nlink != 2)
  89         errx(1, "nlink not 2 (%d)", sb.st_nlink);
  90
  91     if (sb.st_size != offset)
  92         errx(1, "bad size %d", (int)sb.st_size);
  93
  94     if (close(fd) < 0)
  95         err(1, "close %s", filename);
  96
  97     if (unlink(linkname) < 0)
  98         err(1, "unlink %s", linkname);
  99
 100     if (unlink(filename) < 0)
 101         err(1, "unlink %s", filename);
 102
 103     free(buf);
 104 }
 105
 106 int
 107 main(int argc, char **argv)
 108 {
 109     setprogname(argv[0]);
 110
 111     doit("foo", "bar");
 112
 113     return 0;
 114 }