posix/tst-truncate.c

   1 /* Tests for ftruncate and truncate.
   2    Copyright (C) 2000 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <error.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/stat.h>
  26
  27
  28 /* Allow testing of the 64-bit versions as well.  */
  29 #ifndef TRUNCATE
  30 # define TRUNCATE truncate
  31 # define FTRUNCATE ftruncate
  32 #endif
  33
  34 #define STRINGIFY(s) STRINGIFY2 (s)
  35 #define STRINGIFY2(s) #s
  36
  37 /* Prototype for our test function.  */
  38 extern void do_prepare (int argc, char *argv[]);
  39 extern int do_test (int argc, char *argv[]);
  40
  41 /* We have a preparation function.  */
  42 #define PREPARE do_prepare
  43
  44 /* We might need a bit longer timeout.  */
  45 #define TIMEOUT 20 /* sec */
  46
  47 /* This defines the `main' function and some more.  */
  48 #include <test-skeleton.c>
  49
  50 /* These are for the temporary file we generate.  */
  51 char *name;
  52 int fd;
  53
  54 void
  55 do_prepare (int argc, char *argv[])
  56 {
  57    size_t name_len;
  58
  59 #define FNAME FNAME2(TRUNCATE)
  60 #define FNAME2(s) "/" STRINGIFY(s) "XXXXXX"
  61
  62    name_len = strlen (test_dir);
  63    name = malloc (name_len + sizeof (FNAME));
  64    mempcpy (mempcpy (name, test_dir, name_len), FNAME, sizeof (FNAME));
  65    add_temp_file (name);
  66
  67    /* Open our test file.   */
  68    fd = mkstemp (name);
  69    if (fd == -1)
  70      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name);
  71 }
  72
  73
  74 int
  75 do_test (int argc, char *argv[])
  76 {
  77   struct stat st;
  78   char buf[1000];
  79
  80   memset (buf, '\0', sizeof (buf));
  81
  82   if (write (fd, buf, sizeof (buf)) != sizeof (buf))
  83     error (EXIT_FAILURE, errno, "during write");
  84
  85   if (fstat (fd, &st) < 0 || st.st_size != sizeof (buf))
  86     error (EXIT_FAILURE, 0, "initial size wrong");
  87
  88
  89   if (FTRUNCATE (fd, 800) < 0)
  90     error (EXIT_FAILURE, errno, "size reduction with %s failed",
  91            STRINGIFY (FTRUNCATE));
  92
  93   if (fstat (fd, &st) < 0 || st.st_size != 800)
  94     error (EXIT_FAILURE, 0, "size after reduction with %s incorrect",
  95            STRINGIFY (FTRUNCATE));
  96
  97   /* The following test covers more than POSIX.  POSIX does not require
  98      that ftruncate() can increase the file size.  But we are testing
  99      Unix systems.  */
 100   if (FTRUNCATE (fd, 1200) < 0)
 101     error (EXIT_FAILURE, errno, "size increase with %s failed",
 102            STRINGIFY (FTRUNCATE));
 103
 104   if (fstat (fd, &st) < 0 || st.st_size != 1200)
 105     error (EXIT_FAILURE, 0, "size after increase with %s incorrect",
 106            STRINGIFY (FTRUNCATE));
 107
 108
 109   if (TRUNCATE (name, 800) < 0)
 110     error (EXIT_FAILURE, errno, "size reduction with %s failed",
 111            STRINGIFY (TRUNCATE));
 112
 113   if (fstat (fd, &st) < 0 || st.st_size != 800)
 114     error (EXIT_FAILURE, 0, "size after reduction with %s incorrect",
 115            STRINGIFY (TRUNCATE));
 116
 117   /* The following test covers more than POSIX.  POSIX does not require
 118      that truncate() can increase the file size.  But we are testing
 119      Unix systems.  */
 120   if (TRUNCATE (name, 1200) < 0)
 121     error (EXIT_FAILURE, errno, "size increase with %s failed",
 122            STRINGIFY (TRUNCATE));
 123
 124   if (fstat (fd, &st) < 0 || st.st_size != 1200)
 125     error (EXIT_FAILURE, 0, "size after increase with %s incorrect",
 126            STRINGIFY (TRUNCATE));
 127
 128
 129   close (fd);
 130   unlink (name);
 131
 132   return 0;
 133 }