202 lines
5.2 KiB
C
202 lines
5.2 KiB
C
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/*
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* Copyright (C) 2007 Nokia Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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* Author: Adrian Hunter
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include "tests.h"
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#define BLOCK_SIZE 32768
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#define BUFFER_SIZE 32768
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static void check_file(int fd, char *data, size_t length)
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{
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ssize_t n, i;
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char buf[BUFFER_SIZE];
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CHECK(lseek(fd, 0, SEEK_SET) != -1);
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n = 0;
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for (;;) {
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i = read(fd, buf, BUFFER_SIZE);
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CHECK(i >= 0);
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if (i == 0)
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break;
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CHECK(memcmp(buf, data + n, i) == 0);
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n += i;
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}
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CHECK(n == length);
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}
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void rndwrite00(void)
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{
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int fd;
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pid_t pid;
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ssize_t written;
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size_t remains;
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size_t block;
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size_t actual_size;
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size_t check_every;
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char *data, *p, *q;
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off_t offset;
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size_t size;
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int64_t repeat;
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char file_name[256];
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char buf[4096];
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/* Create file */
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pid = getpid();
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tests_cat_pid(file_name, "rndwrite00_test_file_", pid);
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fd = open(file_name, O_CREAT | O_RDWR | O_TRUNC,
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S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
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CHECK(fd != -1);
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/* Allocate memory to hold file data */
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CHECK(tests_size_parameter > 0);
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CHECK(tests_size_parameter <= SIZE_MAX);
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data = (char *) malloc(tests_size_parameter);
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CHECK(data != NULL);
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/* Fill with random data */
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srand(pid);
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for (p = data, q = data + tests_size_parameter; p != q; ++p)
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*p = rand();
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/* Write to file */
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p = data;
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remains = tests_size_parameter;
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while (remains > 0) {
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if (remains > BLOCK_SIZE)
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block = BLOCK_SIZE;
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else
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block = remains;
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written = write(fd, p, block);
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if (written <= 0) {
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CHECK(errno == ENOSPC); /* File system full */
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errno = 0;
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break;
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}
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remains -= written;
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p += written;
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}
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actual_size = p - data;
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/* Repeating bit */
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repeat = tests_repeat_parameter;
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check_every = actual_size / 8192;
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for (;;) {
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offset = tests_random_no(actual_size);
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size = tests_random_no(4096);
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/* Don't change the file size */
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if (offset + size > actual_size)
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size = actual_size - offset;
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if (!size)
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continue;
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for (p = buf, q = p + size; p != q; ++p)
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*p = rand();
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CHECK(lseek(fd, offset, SEEK_SET) != -1);
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written = write(fd, buf, size);
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if (written <= 0) {
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CHECK(errno == ENOSPC); /* File system full */
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errno = 0;
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} else
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memcpy(data + offset, buf, written);
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/* Break if repeat count exceeded */
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if (tests_repeat_parameter > 0 && --repeat <= 0)
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break;
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if (repeat % check_every == 0)
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check_file(fd, data, actual_size);
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/* Sleep */
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if (tests_sleep_parameter > 0) {
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unsigned us = tests_sleep_parameter * 1000;
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unsigned rand_divisor = RAND_MAX / us;
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unsigned s = (us / 2) + (rand() / rand_divisor);
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usleep(s);
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}
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}
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/* Check and close file */
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check_file(fd, data, actual_size);
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CHECK(close(fd) != -1);
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if (tests_delete_flag)
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CHECK(unlink(file_name) != -1);
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}
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/* Title of this test */
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const char *rndwrite00_get_title(void)
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{
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return "Randomly write a large test file";
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}
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/* Description of this test */
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const char *rndwrite00_get_description(void)
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{
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return
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"Create a file named rndwrite00_test_file_pid, where " \
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"pid is the process id. " \
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"The file is filled with random data. " \
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"The size of the file is given by the -z or --size option, " \
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"otherwise it defaults to 1000000. " \
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"Then a randomly sized block of random data is written at a " \
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"random location in the file. "\
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"The block size is always in the range 1 to 4095. " \
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"If a sleep value is specified, the process sleeps. " \
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"The number of writes is given by the repeat count. " \
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"The repeat count is set by the -n or --repeat option, " \
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"otherwise it defaults to 10000. " \
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"A repeat count of zero repeats forever. " \
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"The sleep value is given by the -p or --sleep option, " \
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"otherwise it defaults to 0. "
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"Sleep is specified in milliseconds. " \
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"Periodically the data in the file is checked with a copy " \
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"held in memory. " \
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"If the delete option is specified the file is finally " \
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"deleted.";
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}
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int main(int argc, char *argv[])
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{
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int run_test;
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/* Set default test file size */
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tests_size_parameter = 1000000;
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/* Set default test repetition */
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tests_repeat_parameter = 10000;
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/* Set default test sleep */
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tests_sleep_parameter = 0;
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/* Handle common arguments */
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run_test = tests_get_args(argc, argv, rndwrite00_get_title(),
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rndwrite00_get_description(), "zne");
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if (!run_test)
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return 1;
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/* Change directory to the file system and check it is ok for testing */
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tests_check_test_file_system();
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/* Do the actual test */
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rndwrite00();
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return 0;
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}
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