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/*
* Copyright (C) 2007 Nokia Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Author: Adrian Hunter
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "tests.h"
#define WRITE_BUFFER_SIZE 32768
static void ftrunc(void)
{
int fd, i;
pid_t pid;
ssize_t written;
int64_t remains;
size_t block;
const char *file_name;
off_t actual;
char buf[WRITE_BUFFER_SIZE];
file_name = "ftrunc_test_file";
fd = open(file_name, O_CREAT | O_WRONLY,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
CHECK(fd != -1);
pid = getpid();
srand(pid);
for (i = 0; i < WRITE_BUFFER_SIZE;++i)
buf[i] = rand();
remains = tests_size_parameter;
actual = 0;
while (remains > 0) {
if (remains > WRITE_BUFFER_SIZE)
block = WRITE_BUFFER_SIZE;
else
block = remains;
written = write(fd, buf, block);
if (written <= 0) {
CHECK(errno == ENOSPC); /* File system full */
errno = 0;
break;
}
remains -= written;
actual += written;
}
CHECK(ftruncate(fd, (actual ? actual - 1 : actual)) != -1);
CHECK(close(fd) != -1);
CHECK(unlink(file_name) != -1);
}
/* Title of this test */
static const char *ftrunc_get_title(void)
{
return "Truncate a large test file";
}
/* Description of this test */
static const char *ftrunc_get_description(void)
{
return
"Create a file named ftrunc_test_file. " \
"Truncate the file to reduce its length by 1. " \
"Then remove the truncated file. "
"The size is given by the -z or --size option, " \
"otherwise it defaults to 1000000.";
}
int main(int argc, char *argv[])
{
int run_test;
/* Set default test file size */
tests_size_parameter = 1000000;
/* Handle common arguments */
run_test = tests_get_args(argc, argv, ftrunc_get_title(),
ftrunc_get_description(), "z");
if (!run_test)
return 1;
/* Change directory to the file system and check it is ok for testing */
tests_check_test_file_system();
/* Do the actual test */
ftrunc();
return 0;
}
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