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/* Common definitions for pread and pwrite.
Copyright (C) 2016-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
static void do_prepare (void);
#define PREPARE(argc, argv) do_prepare ()
static int do_test (void);
#define TEST_FUNCTION do_test ()
/* This defines the `main' function and some more. */
#include <test-skeleton.c>
/* These are for the temporary file we generate. */
static char *name;
static int fd;
static void
do_prepare (void)
{
fd = create_temp_file ("tst-preadwrite.", &name);
if (fd == -1)
error (EXIT_FAILURE, errno, "cannot create temporary file");
}
static ssize_t
do_test_with_offset (off_t offset)
{
char buf[1000];
char res[1000];
int i;
ssize_t ret;
memset (buf, '\0', sizeof (buf));
memset (res, '\xff', sizeof (res));
if (write (fd, buf, sizeof (buf)) != sizeof (buf))
error (EXIT_FAILURE, errno, "during write");
for (i = 100; i < 200; ++i)
buf[i] = i;
ret = pwrite (fd, buf + 100, 100, offset + 100);
if (ret == -1)
error (EXIT_FAILURE, errno, "during pwrite");
for (i = 450; i < 600; ++i)
buf[i] = i;
ret = pwrite (fd, buf + 450, 150, offset + 450);
if (ret == -1)
error (EXIT_FAILURE, errno, "during pwrite");
ret = pread (fd, res, sizeof (buf) - 50, offset + 50);
if (ret == -1)
error (EXIT_FAILURE, errno, "during pread");
if (memcmp (buf + 50, res, ret) != 0)
{
printf ("error: read of pread != write of pwrite\n");
return -1;
}
return ret;
}
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