posix/tst-preadwrite.c

   1 /* Tests for pread and pwrite.
   2    Copyright (C) 1998 Free Software Foundation, Inc.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25
  26 /* Prototype for our test function.  */
  27 extern void do_prepare (int argc, char *argv[]);
  28 extern int do_test (int argc, char *argv[]);
  29
  30 /* We have a preparation function.  */
  31 #define PREPARE do_prepare
  32
  33 /* We might need a bit longer timeout.  */
  34 #define TIMEOUT 20 /* sec */
  35
  36 /* This defines the `main' function and some more.  */
  37 #include <test-skeleton.c>
  38
  39 /* These are for the temporary file we generate.  */
  40 char *name;
  41 int fd;
  42
  43 void
  44 do_prepare (int argc, char *argv[])
  45 {
  46    char name_len;
  47
  48      name_len = strlen (test_dir);
  49      name = malloc (name_len + sizeof ("/preadwriteXXXXXX"));
  50      mempcpy (mempcpy (name, test_dir, name_len),
  51               "/preadwriteXXXXXX", sizeof ("/preadwriteXXXXXX"));
  52      add_temp_file (name);
  53
  54      /* Open our test file.   */
  55      fd = mkstemp (name);
  56      if (fd == -1)
  57        error (EXIT_FAILURE, errno, "cannot open test file `%s'", name);
  58 }
  59
  60
  61 int
  62 do_test (int argc, char *argv[])
  63 {
  64   char buf[1000];
  65   char res[1000];
  66   int i;
  67
  68   memset (buf, '\0', sizeof (buf));
  69   memset (res, '\xff', sizeof (res));
  70
  71   if (write (fd, buf, sizeof (buf)) != sizeof (buf))
  72     error (EXIT_FAILURE, errno, "during write");
  73
  74   for (i = 100; i < 200; ++i)
  75     buf[i] = i;
  76   if (pwrite (fd, buf + 100, 100, 100) != 100)
  77     error (EXIT_FAILURE, errno, "during pwrite");
  78
  79   for (i = 450; i < 600; ++i)
  80     buf[i] = i;
  81   if (pwrite (fd, buf + 450, 150, 450) != 150)
  82     error (EXIT_FAILURE, errno, "during pwrite");
  83
  84   if (pread (fd, res, sizeof (buf) - 50, 50) != sizeof (buf) - 50)
  85     error (EXIT_FAILURE, errno, "during pread");
  86
  87   close (fd);
  88   unlink (name);
  89
  90   return memcmp (buf + 50, res, sizeof (buf) - 50);
  91 }