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/*
* Author: Colin King <colin.king@canonical.com>
*
* Copyright (C) 2012 Canonical, Ltd.
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <limits.h>
#define TEST_PASSED (0)
#define TEST_FAILED (1)
#define TEST_ERROR (2)
#define BUFF_SZ (65536)
int test_exercise(char *filename, ssize_t size)
{
int fd;
ssize_t i;
ssize_t n;
struct stat statbuf;
ssize_t nbytes = size;
int ret = TEST_FAILED;
unsigned char buff[BUFF_SZ];
unlink(filename);
if ((fd = open(filename, O_RDWR | O_CREAT, 0600)) < 0) {
fprintf(stderr, "Failed to open %s: %s\n", filename, strerror(errno));
return TEST_FAILED;
}
memset(buff, 0, sizeof(buff));
while (nbytes > 0) {
int rc;
ssize_t n = (nbytes > BUFF_SZ) ? BUFF_SZ : nbytes;
rc = write(fd, buff, n);
if (rc < 0) {
if (errno == ENOSPC)
ret = TEST_PASSED;
break;
}
nbytes -= n;
}
/* If we got here, we didn't get ENOSPC, so we've failed */
close(fd);
unlink(filename);
return ret;
}
void sighandler(int dummy)
{
exit(TEST_ERROR);
}
int main(int argc, char **argv)
{
ssize_t len;
if (argc < 3) {
fprintf(stderr, "Syntax: %s filename size_in_K\n", argv[0]);
fprintf(stderr, "\tsize must be bigger than available space on the file system\n");
exit(TEST_ERROR);
}
len = atoll(argv[2]);
if (len < 1) {
fprintf(stderr, "size should be > 0\n");
exit(TEST_ERROR);
}
signal(SIGINT, sighandler);
exit(test_exercise(argv[1], len * 1024));
}
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