1f08c3bdfSopenharmony_ci/* 2f08c3bdfSopenharmony_ci * 3f08c3bdfSopenharmony_ci * Copyright (c) International Business Machines Corp., 2003 4f08c3bdfSopenharmony_ci * 5f08c3bdfSopenharmony_ci * This program is free software; you can redistribute it and/or modify 6f08c3bdfSopenharmony_ci * it under the terms of the GNU General Public License as published by 7f08c3bdfSopenharmony_ci * the Free Software Foundation; either version 2 of the License, or 8f08c3bdfSopenharmony_ci * (at your option) any later version. 9f08c3bdfSopenharmony_ci * 10f08c3bdfSopenharmony_ci * This program is distributed in the hope that it will be useful, 11f08c3bdfSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 12f08c3bdfSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13f08c3bdfSopenharmony_ci * the GNU General Public License for more details. 14f08c3bdfSopenharmony_ci * 15f08c3bdfSopenharmony_ci * You should have received a copy of the GNU General Public License 16f08c3bdfSopenharmony_ci * along with this program; if not, write to the Free Software 17f08c3bdfSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18f08c3bdfSopenharmony_ci */ 19f08c3bdfSopenharmony_ci 20f08c3bdfSopenharmony_ci/* 21f08c3bdfSopenharmony_ci * FILE : create_datafile.c 22f08c3bdfSopenharmony_ci * PURPOSE : Creates a file of specified size. 23f08c3bdfSopenharmony_ci * HISTORY : 24f08c3bdfSopenharmony_ci * 10/17/2003 Robbie Williamson 25f08c3bdfSopenharmony_ci * -Written 26f08c3bdfSopenharmony_ci */ 27f08c3bdfSopenharmony_ci 28f08c3bdfSopenharmony_ci#include <stdio.h> 29f08c3bdfSopenharmony_ci#include <stdlib.h> 30f08c3bdfSopenharmony_ci#include <sys/types.h> 31f08c3bdfSopenharmony_ci#include <sys/stat.h> 32f08c3bdfSopenharmony_ci#include <unistd.h> 33f08c3bdfSopenharmony_ci#include <fcntl.h> 34f08c3bdfSopenharmony_ci#include <string.h> 35f08c3bdfSopenharmony_ci 36f08c3bdfSopenharmony_ci/* set write buffer size to whatever floats your boat. I usually use 1M */ 37f08c3bdfSopenharmony_ci#define BSIZE 1048576L 38f08c3bdfSopenharmony_ci 39f08c3bdfSopenharmony_ciint main(int argc, char *argv[]) 40f08c3bdfSopenharmony_ci{ 41f08c3bdfSopenharmony_ci off_t i; 42f08c3bdfSopenharmony_ci long bufnum; 43f08c3bdfSopenharmony_ci char buf[BSIZE]; 44f08c3bdfSopenharmony_ci off_t fd; 45f08c3bdfSopenharmony_ci 46f08c3bdfSopenharmony_ci if (argc != 3 || atoi(argv[1]) < 1) { 47f08c3bdfSopenharmony_ci printf 48f08c3bdfSopenharmony_ci ("usage:\n\tcreate_file <# of %ld buffers to write> <name of file to create>\n\t ex. # create_file 10 /tmp/testfile\n", 49f08c3bdfSopenharmony_ci BSIZE); 50f08c3bdfSopenharmony_ci exit(3); 51f08c3bdfSopenharmony_ci } 52f08c3bdfSopenharmony_ci bufnum = strtol(argv[1], NULL, 0); 53f08c3bdfSopenharmony_ci printf("Started building a %lu megabyte file\n", bufnum); 54f08c3bdfSopenharmony_ci buf[0] = 'A'; 55f08c3bdfSopenharmony_ci for (i = 1; i < BSIZE; i++) 56f08c3bdfSopenharmony_ci buf[i] = buf[i - 1] + 1; 57f08c3bdfSopenharmony_ci buf[BSIZE - 1] = 'Z'; 58f08c3bdfSopenharmony_ci 59f08c3bdfSopenharmony_ci if ((fd = creat(argv[2], 0755)) == -1) 60f08c3bdfSopenharmony_ci perror("lftest: "); 61f08c3bdfSopenharmony_ci 62f08c3bdfSopenharmony_ci for (i = 0; i < bufnum; i++) { 63f08c3bdfSopenharmony_ci if (write(fd, buf, BSIZE) == -1) 64f08c3bdfSopenharmony_ci return -1; 65f08c3bdfSopenharmony_ci else { 66f08c3bdfSopenharmony_ci printf("."); 67f08c3bdfSopenharmony_ci fflush(stdout); 68f08c3bdfSopenharmony_ci } 69f08c3bdfSopenharmony_ci fsync(fd); 70f08c3bdfSopenharmony_ci } 71f08c3bdfSopenharmony_ci close(fd); 72f08c3bdfSopenharmony_ci printf("\nFinished building a %lu megabyte file\n", bufnum); 73f08c3bdfSopenharmony_ci return (0); 74f08c3bdfSopenharmony_ci} 75