posix/tst-preadwrite.c

   1 /* Tests for pread and pwrite.
   2    Copyright (C) 1998, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   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
  26
  27 /* Allow testing of the 64-bit versions as well.  */
  28 #ifndef PREAD
  29 # define PREAD pread
  30 # define PWRITE pwrite
  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 = malloc (name_len + sizeof (FNAME));
  63    if (name == NULL)
  64      error (EXIT_FAILURE, errno, "cannot allocate file name");
  65    mempcpy (mempcpy (name, test_dir, name_len), FNAME, sizeof (FNAME));
  66    add_temp_file (name);
  67
  68    /* Open our test file.   */
  69    fd = mkstemp (name);
  70    if (fd == -1)
  71      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name);
  72 }
  73
  74
  75 int
  76 do_test (int argc, char *argv[])
  77 {
  78   char buf[1000];
  79   char res[1000];
  80   int i;
  81
  82   memset (buf, '\0', sizeof (buf));
  83   memset (res, '\xff', sizeof (res));
  84
  85   if (write (fd, buf, sizeof (buf)) != sizeof (buf))
  86     error (EXIT_FAILURE, errno, "during write");
  87
  88   for (i = 100; i < 200; ++i)
  89     buf[i] = i;
  90   if (PWRITE (fd, buf + 100, 100, 100) != 100)
  91     error (EXIT_FAILURE, errno, "during %s", STRINGIFY (PWRITE));
  92
  93   for (i = 450; i < 600; ++i)
  94     buf[i] = i;
  95   if (PWRITE (fd, buf + 450, 150, 450) != 150)
  96     error (EXIT_FAILURE, errno, "during %s", STRINGIFY (PWRITE));
  97
  98   if (PREAD (fd, res, sizeof (buf) - 50, 50) != sizeof (buf) - 50)
  99     error (EXIT_FAILURE, errno, "during %s", STRINGIFY (PREAD));
 100
 101   close (fd);
 102   unlink (name);
 103
 104   return memcmp (buf + 50, res, sizeof (buf) - 50);
 105 }