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      1 /*	$NetBSD: write.c,v 1.2 2008/04/28 20:23:06 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Luke Mewburn.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/param.h>
     33 
     34 #include <err.h>
     35 #include <errno.h>
     36 #include <fcntl.h>
     37 #include <stdio.h>
     38 #include <stdlib.h>
     39 #include <unistd.h>
     40 
     41 
     42 int
     43 main(int argc, char **argv)
     44 {
     45 	int fd, n;
     46 	char buffer[128];
     47 
     48 	if (argc != 2)
     49 		errx(1, "Usage: %s file", argv[0]);
     50 
     51 	fd = open(argv[1], O_WRONLY);
     52 	if (fd < 0)
     53 		err(1, "open: %s", argv[1]);
     54 
     55 	lseek(fd, 0, SEEK_SET);
     56 	memset(buffer, 'a', sizeof(buffer));
     57 
     58 	n = write(fd, buffer, sizeof(buffer));
     59 	if (n == -1)
     60 		err(1, "write");
     61 	else if (n != sizeof(buffer))
     62 		errx(1, "write returned %d", n);
     63 
     64 	close(fd);
     65 }
     66