tests/truncate-write.c

   1 /*
   2  * Copyright (c) 2000, 2006 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 RCSID("$Id$");
  48
  49 /*
  50  * truncate-write:
  51  *
  52  * tries to trigger a case where nnpfs believes it has blocks beyond
  53  * eof on a newly truncated file, which causes arlad to be surprised
  54  * about the length of the subsequent write.
  55  *
  56  * Fixed in nnpfs/bsd/nnpfs_message.c: 1.99.4.16.
  57  */
  58
  59 static void
  60 create_and_write(char *name, const char *buf, int len)
  61 {
  62     int fd, ret;
  63     fd = open(name, O_WRONLY|O_CREAT|O_TRUNC, 0666);
  64     if (fd < 0)
  65         err(1, "open");
  66     ret = write(fd, buf, len);
  67     if (ret != len)
  68         err(1, "write");
  69     ret = close(fd);
  70     if (ret < 0)
  71         err(1, "close");
  72 }
  73
  74 static void
  75 write_and_truncate(char *name, const char *buf, int len)
  76 {
  77     int fd, ret;
  78     fd = open(name, O_WRONLY);
  79     if (fd < 0)
  80         err(1, "open");
  81     ret = write(fd, buf, len);
  82     if (ret != len)
  83         err(1, "write");
  84     ret = ftruncate(fd, 0);
  85     if (ret < 0)
  86         err(1, "ftruncate");
  87     ret = close(fd);
  88     if (ret < 0)
  89         err(1, "close");
  90 }
  91
  92 int
  93 main(int argc, char **argv)
  94 {
  95     int ret;
  96     int size = 260*1024; /* keep it larger than block size */
  97     char *buf = malloc(size);
  98
  99     setprogname(argv[0]);
 100
 101     memset(buf, 'c', size);
 102
 103     create_and_write("foo", buf, size);
 104     create_and_write("foo", buf, size);
 105
 106     write_and_truncate("foo", buf, size);
 107     write_and_truncate("foo", buf, size);
 108
 109     ret = unlink("foo");
 110     if (ret < 0)
 111         err(1, "unlink");
 112
 113     free(buf);
 114
 115     return 0;
 116 }