1/* $OpenBSD: ftruncate.c,v 1.1 2018/07/08 02:14:54 anton Exp $ */ 2/* 3 * Copyright (c) 2018 Anton Lindqvist <anton@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* 19 * Regression test for NULL-deref inside vn_writechk(). 20 */ 21 22#include <err.h> 23#include <fcntl.h> 24#include <stdio.h> 25#include <unistd.h> 26#include <stdlib.h> 27 28int 29main(void) 30{ 31 const char *path = "/dev/bpf"; 32 int fd; 33 34 fd = open(path, O_RDWR); 35 if (fd == -1) 36 err(1, "open: %s", path); 37 if (ftruncate(fd, 0) == -1) 38 err(1, "ftruncate"); 39 close(fd); 40 41 return 0; 42} 43