src/tests/still-there-p.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 <errno.h>
  41
  42 #include <sys/types.h>
  43 #include <sys/stat.h>
  44 #include <fcntl.h>
  45 #include <unistd.h>
  46 #include <dirent.h>
  47
  48
  49 #include <err.h>
  50
  51 #define TEST_BUFFER_SZ          (1024*8)
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56     const char *file = "foo";
  57     char otherbuf[TEST_BUFFER_SZ];
  58     char buf[TEST_BUFFER_SZ];
  59     int fd;
  60
  61
  62     fd = open(file, O_RDWR | O_TRUNC | O_CREAT, 0644);
  63     if (fd < 0)
  64         err(1, "open(%s)", file);
  65
  66     if (write(fd, buf, sizeof(buf)) != sizeof(buf))
  67         errx(1, "write");
  68
  69     while (1) {
  70         if (lseek(fd, 0, SEEK_SET) < 0)
  71             err(1, "lseek");
  72
  73         if (read(fd, otherbuf, sizeof(otherbuf)) != sizeof(otherbuf)) {
  74             struct stat sb;
  75
  76             if (fstat(fd, &sb) < 0)
  77                 err(1, "fstat");
  78             printf("size: %d\n", (int)sb.st_size);
  79             printf("lseek(SEEK_CUR): %d\n", (int)lseek(fd, 0, SEEK_CUR));
  80             errx(1, "read");
  81         }
  82
  83         if (memcmp(buf, otherbuf, sizeof(buf)) != 0)
  84             errx(1, "buf != otherbuf");
  85     }
  86     close(fd);
  87
  88     return 0;
  89 }