posix/tst-preadwrite.c

   1 /* Tests for pread and pwrite.
   2    Copyright (C) 1998-2015 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, 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
  25
  26 /* Allow testing of the 64-bit versions as well.  */
  27 #ifndef PREAD
  28 # define PREAD pread
  29 # define PWRITE pwrite
  30 #endif
  31
  32 #define STRINGIFY(s) STRINGIFY2 (s)
  33 #define STRINGIFY2(s) #s
  34
  35 /* Prototype for our test function.  */
  36 extern void do_prepare (int argc, char *argv[]);
  37 extern int do_test (int argc, char *argv[]);
  38
  39 /* We have a preparation function.  */
  40 #define PREPARE do_prepare
  41
  42 /* We might need a bit longer timeout.  */
  43 #define TIMEOUT 20 /* sec */
  44
  45 /* This defines the `main' function and some more.  */
  46 #include <test-skeleton.c>
  47
  48 /* These are for the temporary file we generate.  */
  49 char *name;
  50 int fd;
  51
  52 void
  53 do_prepare (int argc, char *argv[])
  54 {
  55    size_t name_len;
  56
  57 #define FNAME FNAME2(TRUNCATE)
  58 #define FNAME2(s) "/" STRINGIFY(s) "XXXXXX"
  59
  60    name_len = strlen (test_dir);
  61    name = malloc (name_len + sizeof (FNAME));
  62    if (name == NULL)
  63      error (EXIT_FAILURE, errno, "cannot allocate file name");
  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   char buf[1000];
  78   char res[1000];
  79   int i;
  80
  81   memset (buf, '\0', sizeof (buf));
  82   memset (res, '\xff', sizeof (res));
  83
  84   if (write (fd, buf, sizeof (buf)) != sizeof (buf))
  85     error (EXIT_FAILURE, errno, "during write");
  86
  87   for (i = 100; i < 200; ++i)
  88     buf[i] = i;
  89   if (PWRITE (fd, buf + 100, 100, 100) != 100)
  90     error (EXIT_FAILURE, errno, "during %s", STRINGIFY (PWRITE));
  91
  92   for (i = 450; i < 600; ++i)
  93     buf[i] = i;
  94   if (PWRITE (fd, buf + 450, 150, 450) != 150)
  95     error (EXIT_FAILURE, errno, "during %s", STRINGIFY (PWRITE));
  96
  97   if (PREAD (fd, res, sizeof (buf) - 50, 50) != sizeof (buf) - 50)
  98     error (EXIT_FAILURE, errno, "during %s", STRINGIFY (PREAD));
  99
 100   close (fd);
 101   unlink (name);
 102
 103   return memcmp (buf + 50, res, sizeof (buf) - 50);
 104 }