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/* Common definitions for preadv and pwritev.
Copyright (C) 2016-2017 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
<http://www.gnu.org/licenses/>. */
#include <sys/uio.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 ()
#include "test-skeleton.c"
static char *temp_filename;
static int temp_fd;
static void
do_prepare (void)
{
temp_fd = create_temp_file ("tst-preadvwritev.", &temp_filename);
if (temp_fd == -1)
{
printf ("cannot create temporary file: %m\n");
exit (1);
}
}
#define FAIL(str) \
do { printf ("error: %s (line %d)\n", str, __LINE__); return 1; } while (0)
static int
do_test_with_offset (off_t offset)
{
struct iovec iov[2];
ssize_t ret;
char buf1[32];
char buf2[64];
memset (buf1, 0xf0, sizeof buf1);
memset (buf2, 0x0f, sizeof buf2);
/* Write two buffer with 32 and 64 bytes respectively. */
memset (iov, 0, sizeof iov);
iov[0].iov_base = buf1;
iov[0].iov_len = sizeof buf1;
iov[1].iov_base = buf2;
iov[1].iov_len = sizeof buf2;
ret = pwritev (temp_fd, iov, 2, offset);
if (ret == -1)
FAIL ("first pwritev returned -1");
if (ret != (sizeof buf1 + sizeof buf2))
FAIL ("first pwritev returned an unexpected value");
ret = pwritev (temp_fd, iov, 2, sizeof buf1 + sizeof buf2 + offset);
if (ret == -1)
FAIL ("second pwritev returned -1");
if (ret != (sizeof buf1 + sizeof buf2))
FAIL ("second pwritev returned an unexpected value");
char buf3[32];
char buf4[64];
memset (buf3, 0x0f, sizeof buf3);
memset (buf4, 0xf0, sizeof buf4);
iov[0].iov_base = buf3;
iov[0].iov_len = sizeof buf3;
iov[1].iov_base = buf4;
iov[1].iov_len = sizeof buf4;
/* Now read two buffer with 32 and 64 bytes respectively. */
ret = preadv (temp_fd, iov, 2, offset);
if (ret == -1)
FAIL ("first preadv returned -1");
if (ret != (sizeof buf3 + sizeof buf4))
FAIL ("first preadv returned an unexpected value");
if (memcmp (buf1, buf3, sizeof buf1) != 0)
FAIL ("first buffer from first preadv different than expected");
if (memcmp (buf2, buf4, sizeof buf2) != 0)
FAIL ("second buffer from first preadv different than expected");
ret = preadv (temp_fd, iov, 2, sizeof buf3 + sizeof buf4 + offset);
if (ret == -1)
FAIL ("second preadv returned -1");
if (ret != (sizeof buf3 + sizeof buf4))
FAIL ("second preadv returned an unexpected value");
/* And compare the buffers read and written to check if there are equal. */
if (memcmp (buf1, buf3, sizeof buf1) != 0)
FAIL ("first buffer from second preadv different than expected");
if (memcmp (buf2, buf4, sizeof buf2) != 0)
FAIL ("second buffer from second preadv different than expected");
return 0;
}
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