tests/read-past-eof.c

   1 /*
   2  * Copyright (c) 2003, Stockholms Universitet
   3  * (Stockholm University, 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 university 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <sys/types.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <unistd.h>
  45
  46 #include <atypes.h>
  47
  48 #ifndef O_LARGEFILE
  49 #define O_LARGEFILE 0
  50 #endif
  51
  52 int
  53 main(int argc, char **argv)
  54 {
  55     off_t large = 2147483647; /* 2G-1; */
  56     off_t larger = ((uint64_t)1 << 33) + 1; /* 8G+1; */
  57     char buf[1024 * 8];
  58     int fd;
  59     const char *fn = "f-file";
  60     FILE *verbose_fp;
  61
  62     verbose_fp = fdopen (4, "w");
  63     if (verbose_fp == NULL) {
  64         verbose_fp = fopen ("/dev/null", "w");
  65         if (verbose_fp == NULL)
  66             err (1, "fopen");
  67     }
  68
  69     if ((fd = open(fn, O_RDWR|O_CREAT|O_LARGEFILE, 0600)) < 0)
  70         err(1, "open");
  71
  72     pread(fd, buf, sizeof(buf), large);
  73
  74     if (ftruncate(fd, large - sizeof(buf)) < 0) {
  75 #ifdef EDQUOT
  76         if (errno == EDQUOT)
  77             warnx("get yourself more quota for this test, you'll need at least 2G free");
  78 #endif
  79         err(1, "ftruncate");
  80     }
  81     pread(fd, buf, sizeof(buf), large - sizeof(buf));
  82
  83     /* now try even larger */
  84     pread(fd, buf, sizeof(buf), larger);
  85
  86     if (ftruncate(fd, larger + sizeof(buf)) < 0) {
  87         if (errno != E2BIG && errno != EFBIG)
  88             err(1, "ftruncate > 32bit file");
  89         fprintf(verbose_fp, "ftruncate > 32bit file: %s(%d)\n",
  90                 strerror(errno), errno);
  91     }
  92     pread(fd, buf, sizeof(buf), larger);
  93
  94     if (ftruncate(fd, 0) < 0)
  95         err(1, "ftruncate");
  96
  97     close(fd);
  98
  99     unlink(fn);
 100
 101     return 0;
 102 }