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 #include <roken.h>
  46
  47 #ifdef RCSID
  48 RCSID("$Id$");
  49 #endif
  50
  51 int
  52 main(int argc, char *argv[])
  53 {
  54     int fd1, fd2;
  55     int ret;
  56     struct stat sb1, sb2;
  57
  58     setprogname (argv[0]);
  59
  60     fd1 = open("foo", O_RDWR|O_CREAT, 0666);
  61     if (fd1 < 0)
  62         err (1, "open foo");
  63
  64     ret = fstat (fd1, &sb1);
  65     if (ret < 0)
  66         err (1, "stat foo");
  67
  68     if (sb1.st_nlink != 1)
  69         errx (1, "foo.st_nlink != 1");
  70
  71     ret = link ("foo", "bar");
  72     if (ret < 0)
  73         err (1, "link foo, bar");
  74
  75     ret = fstat (fd1, &sb1);
  76     if (ret < 0)
  77         err (1, "stat foo");
  78
  79     ret = lstat ("bar", &sb2);
  80     if (ret < 0)
  81         err (1, "stat bar");
  82
  83     if (sb1.st_nlink != 2)
  84         errx (1, "foo.st_nlink != 2");
  85
  86     if (sb2.st_nlink != 2)
  87         errx (1, "bar.st_nlink != 2");
  88
  89     if (sb1.st_dev    != sb2.st_dev
  90         || sb1.st_ino != sb2.st_ino)
  91         errx (1, "dev and ino differ");
  92
  93     fd2 = open("bar", O_RDONLY, 0);
  94     if (fd2 < 0)
  95         err (1, "open bar");
  96
  97     ret = fstat (fd2, &sb2);
  98     if (ret < 0)
  99         err (1, "fstat bar");
 100
 101     if (sb2.st_nlink != 2)
 102         errx (1, "bar.st_nlink != 2");
 103
 104     if (write (fd1, "hej", 3) != 3)
 105         errx (1, "write to foo");
 106
 107     ret = fstat (fd1, &sb1);
 108     if (ret < 0)
 109         err (1, "stat foo");
 110
 111     if (sb1.st_size != 3)
 112         errx (1, "foo.st_size != 3");
 113
 114     ret = close (fd1);
 115     if (ret < 0)
 116         err (1, "close foo");
 117
 118     ret = fstat (fd2, &sb2);
 119     if (ret < 0)
 120         err (1, "fstat bar");
 121
 122     if (sb2.st_size != 3)
 123         errx (1, "bar.st_size != 3");
 124
 125     if (unlink ("foo") < 0)
 126         err (1, "unlink foo");
 127
 128     ret = fstat (fd2, &sb2);
 129     if (ret < 0)
 130         err (1, "fstat bar");
 131
 132     if (sb2.st_nlink != 1)
 133         errx (1, "bar.st_nlink != 1");
 134
 135     if (unlink ("bar") < 0)
 136         err (1, "unlink bar");
 137
 138     ret = fstat (fd2, &sb2);
 139     if (ret < 0)
 140         err (1, "fstat bar");
 141
 142     if (sb2.st_nlink != 0)
 143         errx (1, "bar.st_nlink != 0");
 144
 145     ret = close (fd2);
 146     if (ret < 0)
 147         err (1, "close bar");
 148     return 0;
 149 }