tests/write3.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 <sys/types.h>
  39
  40 #include <stdio.h>
  41
  42 #include <sys/stat.h>
  43 #include <fcntl.h>
  44 #include <unistd.h>
  45
  46 #include <roken.h>
  47
  48 #include <err.h>
  49
  50 const char *fn = "foobar";
  51
  52 static void
  53 check_size(const char *fn, size_t sz, int paranoia)
  54 {
  55     struct stat sb;
  56
  57     if (paranoia)
  58         return;
  59
  60     if (stat(fn, &sb) < 0)
  61         err(1, "stat");
  62     if (sb.st_size != sz)
  63         errx(1, "st_size mismatch %d != %d", (int)sb.st_size, (int)sz);
  64 }
  65
  66 static void
  67 check_size_read(int fd, size_t sz)
  68 {
  69     off_t old_off;
  70     size_t sz2;
  71     void *buf;
  72
  73     if ((old_off = lseek(fd, 0, SEEK_CUR)) < 0)
  74         err(1, "lseek");
  75
  76     if (lseek(fd, 0, SEEK_SET) < 0)
  77         err(1, "lseek");
  78     buf = malloc(sz);
  79     if (buf == NULL)
  80         errx(1, "malloc");
  81     if ((sz2 = read(fd, buf, sz)) < 0)
  82         errx(1, "read");
  83     if (sz2 != sz)
  84         errx(1, "end before end: sz2 (%u) != sz (%u)", (unsigned)sz2,
  85              (unsigned)sz);
  86     if ((sz2 = lseek(fd, 0, SEEK_END)) < 0)
  87         errx(1, "lseek");
  88     if (sz2 != sz)
  89         errx(1, "end past end: sz2 (%u) != sz (%u)", (unsigned)sz2,
  90              (unsigned)sz);
  91     free(buf);
  92 }
  93
  94
  95 int
  96 main(int argc, char **argv)
  97 {
  98     int fd;
  99
 100     fd = open(fn, O_RDWR|O_CREAT|O_TRUNC, 0644);
 101     if (fd < 0)
 102         err(1, "open1");
 103     if (write(fd,"kaka", 4) != 4)
 104         errx(1, "write1");
 105     check_size(fn, 4, 1);
 106     if (close(fd) < 0)
 107         err(1, "close1");
 108
 109     check_size(fn, 4, 0);
 110
 111     fd = open(fn,O_RDWR|O_CREAT|O_TRUNC,644);
 112     if (fd < 0)
 113         err(1, "open2");
 114     check_size(fn, 0, 1);
 115     if (write(fd,"kaka", 4) != 4)
 116         errx(1, "write2");
 117     check_size(fn, 4, 1);
 118     check_size_read(fd, 4);
 119     if (close(fd) < 0)
 120         err(1, "close2");
 121     check_size(fn, 4, 1);
 122
 123     return 0;
 124 }