/* * Copyright (c) 2004 Daniel McNeil <daniel@osdl.org> * 2004 Open Source Development Lab * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA * * Module: .c */ /* * Change History: * * 2/2004 Marty Ridgeway (mridge@us.ibm.com) Changes to adapt to LTP * */ #define _GNU_SOURCE #include <stdlib.h> #include <sys/types.h> #include <signal.h> #include <fcntl.h> #include <stdio.h> #include <unistd.h> #include "common_checkzero.h" int read_eof(char *filename) { int fd; int i; int r; char buf[4096]; if ((fd = open(filename, O_RDWR)) < 0) { fprintf(stderr, "can't open file %s \n", filename); exit(1); } for (i = 0; i < 100000; i++) { off_t offset; char *bufoff; offset = lseek(fd, 4096, SEEK_END); r = write(fd, "A", 1); offset = lseek(fd, offset - 4096, SEEK_SET); r = read(fd, buf, 4096); if (r > 0) { if ((bufoff = check_zero(buf, r))) { fprintf(stderr, "non-zero read at offset %p\n", offset + bufoff); exit(1); } } } fprintf(stderr, "read_checkzero done\n"); return 0; } int main(int argc, char **argv) { if (argc < 2) { printf("You must pass a filename to the test \n"); exit(1); } char *filename = argv[1]; read_eof(filename); return 0; }