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/* Test the pwrite function.
Copyright (C) 2009, 2010 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (pwrite, ssize_t, (int, const void *, size_t, off_t));
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "macros.h"
#define N (sizeof buf - 1)
int
main (void)
{
char const *file = "out";
int fd;
char buf[] = "0123456789";
off_t pos = 2;
size_t i;
off_t init_pos;
ASSERT (file);
fd = open (file, O_CREAT | O_WRONLY, 0600);
ASSERT (0 <= fd);
ASSERT (write (fd, buf, N) == N);
ASSERT (close (fd) == 0);
fd = open (file, O_WRONLY, 0600);
ASSERT (0 <= fd);
init_pos = lseek (fd, pos, SEEK_SET);
ASSERT (init_pos == pos);
for (i = 0; i < N; i+=2)
{
const char byte = 'W';
ASSERT (pwrite (fd, &byte, 1, i) == 1);
ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos);
}
{
/* Invalid offset must evoke failure with EINVAL. */
const char byte = 'b';
ASSERT (pwrite (fd, &byte, 1, (off_t) -1) == -1);
ASSERT (errno == EINVAL);
}
ASSERT (close (fd) == 0);
{
fd = open (file, O_RDONLY);
ASSERT (0 <= fd);
ASSERT (read (fd, buf, N) == N);
ASSERT (close (fd) == 0);
ASSERT (strcmp ("W1W3W5W7W9",buf) == 0);
}
return 0;
}
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