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/* Common definitions for preadv and pwritev.
Copyright (C) 2016-2023 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 <array_length.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <support/support.h>
#include <support/xunistd.h>
static char *temp_filename;
static int temp_fd;
static bool temp_fd_supports_holes;
static int do_test (void);
static void
do_prepare (int argc, char **argv)
{
temp_fd = create_temp_file ("tst-preadvwritev.", &temp_filename);
if (temp_fd == -1)
FAIL_EXIT1 ("cannot create temporary file");
temp_fd_supports_holes = support_descriptor_supports_holes (temp_fd);
}
#define PREPARE do_prepare
#ifndef PREADV
# define PREADV(__fd, __iov, __iovcnt, __offset) \
preadv (__fd, __iov, __iovcnt, __offset)
#endif
#ifndef PWRITEV
# define PWRITEV(__fd, __iov, __iovcnt, __offset) \
pwritev (__fd, __iov, __iovcnt, __offset)
#endif
static __attribute__ ((unused)) void
do_test_without_offset (void)
{
xftruncate (temp_fd, 0);
xwrite (temp_fd, "123", 3);
xlseek (temp_fd, 2, SEEK_SET);
{
struct iovec iov[] =
{
{ (void *) "abc", 3 },
{ (void *) "xyzt", 4 },
};
TEST_COMPARE (PWRITEV (temp_fd, iov, array_length (iov), -1), 7);
}
TEST_COMPARE (xlseek (temp_fd, 0, SEEK_CUR), 9);
xlseek (temp_fd, 1, SEEK_SET);
char buf1[3];
char buf2[2];
{
struct iovec iov[] =
{
{ buf1, sizeof (buf1) },
{ buf2, sizeof (buf2) },
};
TEST_COMPARE (PREADV (temp_fd, iov, array_length (iov), -1),
sizeof (buf1) + sizeof (buf2));
TEST_COMPARE (memcmp ("2ab", buf1, sizeof (buf1)), 0);
TEST_COMPARE (memcmp ("cx", buf2, sizeof (buf2)), 0);
TEST_COMPARE (xlseek (temp_fd, 0, SEEK_CUR), 6);
}
xftruncate (temp_fd, 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_RET ("first pwritev returned -1");
if (ret != (sizeof buf1 + sizeof buf2))
FAIL_RET ("first pwritev returned an unexpected value");
ret = PWRITEV (temp_fd, iov, 2, sizeof buf1 + sizeof buf2 + offset);
if (ret == -1)
FAIL_RET ("second pwritev returned -1");
if (ret != (sizeof buf1 + sizeof buf2))
FAIL_RET ("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_RET ("first preadv returned -1");
if (ret != (sizeof buf3 + sizeof buf4))
FAIL_RET ("first preadv returned an unexpected value");
if (memcmp (buf1, buf3, sizeof buf1) != 0)
FAIL_RET ("first buffer from first preadv different than expected");
if (memcmp (buf2, buf4, sizeof buf2) != 0)
FAIL_RET ("second buffer from first preadv different than expected");
ret = PREADV (temp_fd, iov, 2, sizeof buf3 + sizeof buf4 + offset);
if (ret == -1)
FAIL_RET ("second preadv returned -1");
if (ret != (sizeof buf3 + sizeof buf4))
FAIL_RET ("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_RET ("first buffer from second preadv different than expected");
if (memcmp (buf2, buf4, sizeof buf2) != 0)
FAIL_RET ("second buffer from second preadv different than expected");
return 0;
}
#include <support/test-driver.c>
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