/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* FILE : lftest.c
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* DESCRIPTION : The purpose of this test is to verify the file size limitations of a filesystem.
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* It writes one buffer at a time and lseeks from the beginning of the file to the
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* end of the last write position. The intent is to test lseek64.
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* HISTORY:
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* 06/19/01 : Written by Jeff Martin(martinjn@us.ibm.com) to test large files on jfs.
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* 07/12/01 : Added timing.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <time.h>
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/* set write buffer size to whatever floats your boat. I usually use 1M */
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#define BSIZE 1048576L
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char buf[BSIZE];
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int main(int argc, char *argv[])
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{
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off_t i;
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long bufnum;
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off_t fd;
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time_t time1, time2;
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int writecnt = 0, seekcnt = 0, diff;
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time1 = time(NULL);
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if (argc != 2 || atoi(argv[1]) < 1) {
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printf("usage:<# of %ld buffers to write>\n", BSIZE);
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exit(3);
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}
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bufnum = strtol(argv[1], NULL, 0);
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printf("Started building a %lu megabyte file @ %s\n", bufnum,
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asctime(localtime(&time1)));
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buf[0] = 'A';
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for (i = 1; i < BSIZE; i++)
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buf[i] = '0';
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buf[BSIZE - 1] = 'Z';
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if ((fd = creat("large_file", 0755)) == -1)
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perror("lftest: ");
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for (i = 0; i < bufnum; i++) {
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if (write(fd, buf, BSIZE) == -1)
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return -1;
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else {
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printf(".");
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writecnt++;
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fflush(stdout);
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}
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fsync(fd);
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if (lseek(fd, (i + 1) * BSIZE, 0) == -1)
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return -1;
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else
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seekcnt++;
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}
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close(fd);
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time2 = time(NULL);
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printf("\nFinished building a %lu megabyte file @ %s\n", bufnum,
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asctime(localtime(&time2)));
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diff = time2 - time1;
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printf("Number of Writes: %d\n"
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"Number of Seeks: %d\n"
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"Total time for test to run: %d minute(s) and %d seconds\n",
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writecnt, seekcnt, diff / 60, diff % 60);
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return 0;
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}
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