src/tests/hardlink1.c

   1 /*
   2  * Copyright (c) 1999 - 2000 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 <unistd.h>
  40 #include <fcntl.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #include <err.h>
  45
  46 int
  47 main(int argc, char *argv[])
  48 {
  49     int fd1, fd2;
  50     int ret;
  51     struct stat sb1, sb2;
  52
  53
  54     fd1 = open("foo", O_RDWR | O_CREAT, 0666);
  55     if (fd1 < 0)
  56         err(1, "open foo");
  57
  58     ret = fstat(fd1, &sb1);
  59     if (ret < 0)
  60         err(1, "stat foo");
  61
  62     if (sb1.st_nlink != 1)
  63         errx(1, "foo.st_nlink != 1");
  64
  65     ret = link("foo", "bar");
  66     if (ret < 0)
  67         err(1, "link foo, bar");
  68
  69     ret = fstat(fd1, &sb1);
  70     if (ret < 0)
  71         err(1, "stat foo");
  72
  73     ret = lstat("bar", &sb2);
  74     if (ret < 0)
  75         err(1, "stat bar");
  76
  77     if (sb1.st_nlink != 2)
  78         errx(1, "foo.st_nlink != 2");
  79
  80     if (sb2.st_nlink != 2)
  81         errx(1, "bar.st_nlink != 2");
  82
  83     if (sb1.st_dev != sb2.st_dev || sb1.st_ino != sb2.st_ino)
  84         errx(1, "dev and ino differ");
  85
  86     fd2 = open("bar", O_RDONLY, 0);
  87     if (fd2 < 0)
  88         err(1, "open bar");
  89
  90     ret = fstat(fd2, &sb2);
  91     if (ret < 0)
  92         err(1, "fstat bar");
  93
  94     if (sb2.st_nlink != 2)
  95         errx(1, "bar.st_nlink != 2");
  96
  97     if (write(fd1, "hej", 3) != 3)
  98         errx(1, "write to foo");
  99
 100     ret = fstat(fd1, &sb1);
 101     if (ret < 0)
 102         err(1, "stat foo");
 103
 104     if (sb1.st_size != 3)
 105         errx(1, "foo.st_size != 3");
 106
 107     ret = close(fd1);
 108     if (ret < 0)
 109         err(1, "close foo");
 110
 111     ret = fstat(fd2, &sb2);
 112     if (ret < 0)
 113         err(1, "fstat bar");
 114
 115     if (sb2.st_size != 3)
 116         errx(1, "bar.st_size != 3");
 117
 118     ret = close(fd2);
 119     if (ret < 0)
 120         err(1, "close bar");
 121
 122     if (unlink("foo") < 0)
 123         err(1, "unlink foo");
 124
 125     fd2 = open("bar", O_RDONLY, 0);
 126     if (fd2 < 0)
 127         err(1, "open bar");
 128
 129     ret = fstat(fd2, &sb2);
 130     if (ret < 0)
 131         err(1, "fstat bar");
 132
 133     if (sb2.st_nlink != 1)
 134         errx(1, "bar.st_nlink != 1");
 135
 136     ret = close(fd2);
 137     if (ret < 0)
 138         err(1, "close bar");
 139
 140     if (unlink("bar") < 0)
 141         err(1, "unlink bar");
 142
 143     return 0;
 144 }