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write.c revision 1.1 
      1 /*	$NetBSD: write.c,v 1.1 2002/10/03 07:46:03 jdolecek 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/param.h>
     40 
     41 #include <err.h>
     42 #include <errno.h>
     43 #include <fcntl.h>
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <unistd.h>
     47 
     48 
     49 int
     50 main(int argc, char **argv)
     51 {
     52 	int fd, n;
     53 	char buffer[128];
     54 
     55 	if (argc != 2)
     56 		errx(1, "Usage: %s file", argv[0]);
     57 
     58 	fd = open(argv[1], O_WRONLY);
     59 	if (fd < 0)
     60 		err(1, "open: %s", argv[1]);
     61 
     62 	lseek(fd, 0, SEEK_SET);
     63 	memset(buffer, 'a', sizeof(buffer));
     64 
     65 	n = write(fd, buffer, sizeof(buffer));
     66 	if (n == -1)
     67 		err(1, "write");
     68 	else if (n != sizeof(buffer))
     69 		errx(1, "write returned %d", n);
     70 
     71 	close(fd);
     72 }
     73