1 /* 2 * Copyright (c) 2004 Daniel McNeil <daniel (at) osdl.org> 3 * 2004 Open Source Development Lab 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 * 18 * Module: .c 19 */ 20 21 /* 22 * Change History: 23 * 24 * 2/2004 Marty Ridgeway (mridge (at) us.ibm.com) Changes to adapt to LTP 25 * 26 */ 27 #define _GNU_SOURCE 28 29 #include <stdlib.h> 30 #include <sys/types.h> 31 #include <signal.h> 32 #include <fcntl.h> 33 #include <stdio.h> 34 #include <unistd.h> 35 36 #include "common_checkzero.h" 37 38 int read_eof(char *filename) 39 { 40 int fd; 41 int i; 42 int r; 43 char buf[4096]; 44 45 if ((fd = open(filename, O_RDWR)) < 0) { 46 fprintf(stderr, "can't open file %s \n", filename); 47 exit(1); 48 } 49 50 for (i = 0; i < 100000; i++) { 51 off_t offset; 52 char *bufoff; 53 54 offset = lseek(fd, 4096, SEEK_END); 55 r = write(fd, "A", 1); 56 57 offset = lseek(fd, offset - 4096, SEEK_SET); 58 59 r = read(fd, buf, 4096); 60 if (r > 0) { 61 if ((bufoff = check_zero(buf, r))) { 62 fprintf(stderr, "non-zero read at offset %p\n", 63 offset + bufoff); 64 exit(1); 65 } 66 } 67 } 68 fprintf(stderr, "read_checkzero done\n"); 69 return 0; 70 } 71 72 int main(int argc, char **argv) 73 { 74 if (argc < 2) { 75 printf("You must pass a filename to the test \n"); 76 exit(1); 77 } 78 79 char *filename = argv[1]; 80 81 read_eof(filename); 82 83 return 0; 84 } 85
