posix/tst-truncate.c

   1 /* Tests for ftruncate and truncate.
   2    Copyright (C) 2000-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <sys/stat.h>
  25
  26
  27 /* Allow testing of the 64-bit versions as well.  */
  28 #ifndef TRUNCATE
  29 # define TRUNCATE truncate
  30 # define FTRUNCATE ftruncate
  31 #endif
  32
  33 #define STRINGIFY(s) STRINGIFY2 (s)
  34 #define STRINGIFY2(s) #s
  35
  36 /* Prototype for our test function.  */
  37 extern void do_prepare (int argc, char *argv[]);
  38 extern int do_test (int argc, char *argv[]);
  39
  40 /* We have a preparation function.  */
  41 #define PREPARE do_prepare
  42
  43 /* We might need a bit longer timeout.  */
  44 #define TIMEOUT 20 /* sec */
  45
  46 /* This defines the `main' function and some more.  */
  47 #include <test-skeleton.c>
  48
  49 /* These are for the temporary file we generate.  */
  50 char *name;
  51 int fd;
  52
  53 void
  54 do_prepare (int argc, char *argv[])
  55 {
  56    size_t name_len;
  57
  58 #define FNAME FNAME2(TRUNCATE)
  59 #define FNAME2(s) "/" STRINGIFY(s) "XXXXXX"
  60
  61    name_len = strlen (test_dir);
  62    name = xmalloc (name_len + sizeof (FNAME));
  63    mempcpy (mempcpy (name, test_dir, name_len), FNAME, sizeof (FNAME));
  64    add_temp_file (name);
  65
  66    /* Open our test file.   */
  67    fd = mkstemp (name);
  68    if (fd == -1)
  69      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name);
  70 }
  71
  72
  73 int
  74 do_test (int argc, char *argv[])
  75 {
  76   struct stat st;
  77   char buf[1000];
  78
  79   memset (buf, '\0', sizeof (buf));
  80
  81   if (write (fd, buf, sizeof (buf)) != sizeof (buf))
  82     error (EXIT_FAILURE, errno, "during write");
  83
  84   if (fstat (fd, &st) < 0 || st.st_size != sizeof (buf))
  85     error (EXIT_FAILURE, 0, "initial size wrong");
  86
  87
  88   if (FTRUNCATE (fd, 800) < 0)
  89     error (EXIT_FAILURE, errno, "size reduction with %s failed",
  90            STRINGIFY (FTRUNCATE));
  91
  92   if (fstat (fd, &st) < 0 || st.st_size != 800)
  93     error (EXIT_FAILURE, 0, "size after reduction with %s incorrect",
  94            STRINGIFY (FTRUNCATE));
  95
  96   /* The following test covers more than POSIX.  POSIX does not require
  97      that ftruncate() can increase the file size.  But we are testing
  98      Unix systems.  */
  99   if (FTRUNCATE (fd, 1200) < 0)
 100     error (EXIT_FAILURE, errno, "size increase with %s failed",
 101            STRINGIFY (FTRUNCATE));
 102
 103   if (fstat (fd, &st) < 0 || st.st_size != 1200)
 104     error (EXIT_FAILURE, 0, "size after increase with %s incorrect",
 105            STRINGIFY (FTRUNCATE));
 106
 107
 108   if (TRUNCATE (name, 800) < 0)
 109     error (EXIT_FAILURE, errno, "size reduction with %s failed",
 110            STRINGIFY (TRUNCATE));
 111
 112   if (fstat (fd, &st) < 0 || st.st_size != 800)
 113     error (EXIT_FAILURE, 0, "size after reduction with %s incorrect",
 114            STRINGIFY (TRUNCATE));
 115
 116   /* The following test covers more than POSIX.  POSIX does not require
 117      that truncate() can increase the file size.  But we are testing
 118      Unix systems.  */
 119   if (TRUNCATE (name, 1200) < 0)
 120     error (EXIT_FAILURE, errno, "size increase with %s failed",
 121            STRINGIFY (TRUNCATE));
 122
 123   if (fstat (fd, &st) < 0 || st.st_size != 1200)
 124     error (EXIT_FAILURE, 0, "size after increase with %s incorrect",
 125            STRINGIFY (TRUNCATE));
 126
 127
 128   close (fd);
 129   unlink (name);
 130
 131   return 0;
 132 }