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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 <limits.h>
#include "tests.h"
#define BLOCK_SIZE 32768
#define BUFFER_SIZE 32768
static void check_file(int fd, char *data, size_t length)
{
ssize_t n, i;
char buf[BUFFER_SIZE];
CHECK(lseek(fd, 0, SEEK_SET) != -1);
n = 0;
for (;;) {
i = read(fd, buf, BUFFER_SIZE);
CHECK(i >= 0);
if (i == 0)
break;
CHECK(memcmp(buf, data + n, i) == 0);
n += i;
}
CHECK(n == length);
}
static void rndwrite00(void)
{
int fd;
pid_t pid;
ssize_t written;
size_t remains;
size_t block;
size_t actual_size;
size_t check_every;
char *data, *p, *q;
off_t offset;
size_t size;
int64_t repeat;
char file_name[256];
char buf[4096];
/* Create file */
pid = getpid();
tests_cat_pid(file_name, "rndwrite00_test_file_", pid);
fd = open(file_name, O_CREAT | O_RDWR | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
CHECK(fd != -1);
/* Allocate memory to hold file data */
CHECK(tests_size_parameter > 0);
CHECK(tests_size_parameter <= SIZE_MAX);
data = (char *) malloc(tests_size_parameter);
CHECK(data != NULL);
/* Fill with random data */
srand(pid);
for (p = data, q = data + tests_size_parameter; p != q; ++p)
*p = rand();
/* Write to file */
p = data;
remains = tests_size_parameter;
while (remains > 0) {
if (remains > BLOCK_SIZE)
block = BLOCK_SIZE;
else
block = remains;
written = write(fd, p, block);
if (written <= 0) {
CHECK(errno == ENOSPC); /* File system full */
errno = 0;
break;
}
remains -= written;
p += written;
}
actual_size = p - data;
/* Repeating bit */
repeat = tests_repeat_parameter;
check_every = actual_size / 8192;
for (;;) {
offset = tests_random_no(actual_size);
size = tests_random_no(4096);
/* Don't change the file size */
if (offset + size > actual_size)
size = actual_size - offset;
if (!size)
continue;
for (p = buf, q = p + size; p != q; ++p)
*p = rand();
CHECK(lseek(fd, offset, SEEK_SET) != -1);
written = write(fd, buf, size);
if (written <= 0) {
CHECK(errno == ENOSPC); /* File system full */
errno = 0;
} else
memcpy(data + offset, buf, written);
/* Break if repeat count exceeded */
if (tests_repeat_parameter > 0 && --repeat <= 0)
break;
if (repeat % check_every == 0)
check_file(fd, data, actual_size);
/* Sleep */
if (tests_sleep_parameter > 0) {
unsigned us = tests_sleep_parameter * 1000;
unsigned rand_divisor = RAND_MAX / us;
unsigned s = (us / 2) + (rand() / rand_divisor);
usleep(s);
}
}
/* Check and close file */
check_file(fd, data, actual_size);
CHECK(close(fd) != -1);
if (tests_delete_flag)
CHECK(unlink(file_name) != -1);
}
/* Title of this test */
static const char *rndwrite00_get_title(void)
{
return "Randomly write a large test file";
}
/* Description of this test */
static const char *rndwrite00_get_description(void)
{
return
"Create a file named rndwrite00_test_file_pid, where " \
"pid is the process id. " \
"The file is filled with random data. " \
"The size of the file is given by the -z or --size option, " \
"otherwise it defaults to 1000000. " \
"Then a randomly sized block of random data is written at a " \
"random location in the file. "\
"The block size is always in the range 1 to 4095. " \
"If a sleep value is specified, the process sleeps. " \
"The number of writes is given by the repeat count. " \
"The repeat count is set by the -n or --repeat option, " \
"otherwise it defaults to 10000. " \
"A repeat count of zero repeats forever. " \
"The sleep value is given by the -p or --sleep option, " \
"otherwise it defaults to 0. "
"Sleep is specified in milliseconds. " \
"Periodically the data in the file is checked with a copy " \
"held in memory. " \
"If the delete option is specified the file is finally " \
"deleted.";
}
int main(int argc, char *argv[])
{
int run_test;
/* Set default test file size */
tests_size_parameter = 1000000;
/* Set default test repetition */
tests_repeat_parameter = 10000;
/* Set default test sleep */
tests_sleep_parameter = 0;
/* Handle common arguments */
run_test = tests_get_args(argc, argv, rndwrite00_get_title(),
rndwrite00_get_description(), "zne");
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 */
rndwrite00();
return 0;
}
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