test_write.c

来自「使用TAP的蜂窝型GSM手机短消息服务中心」· C语言 代码 · 共 62 行

/* -------------------------------------------------------------------- */
/* SMS Client, send messages to mobile phones and pagers		*/
/*									*/
/* test_write.c								*/
/*									*/
/*  Copyright (C) 1997,1998 Angelo Masci				*/
/*									*/
/*  This library is free software; you can redistribute it and/or	*/
/*  modify it under the terms of the GNU Library General Public		*/
/*  License as published by the Free Software Foundation; either	*/
/*  version 2 of the License, or (at your option) any later version.	*/
/*									*/
/*  This library 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	*/
/*  Library General Public License for more details.			*/
/*									*/
/*  You should have received a copy of the GNU Library General Public	*/
/*  License along with this library; if not, write to the Free		*/
/*  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	*/
/*									*/
/*  You can contact the author at this e-mail address:			*/
/*									*/
/*  [e-mail]						*/
/*									*/
/* -------------------------------------------------------------------- */
/* $Id$
   -------------------------------------------------------------------- */

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

/* -------------------------------------------------------------------- */
/* -------------------------------------------------------------------- */
int main(int argc, char **argv)
{
	int fd;


	if (argc != 2)
	{	fprintf(stderr, "Usage: %s <file>\n", argv[0]);
		exit(1);
	}

	fd = open(argv[1], O_RDWR|O_NONBLOCK);
	if (fd == -1)
	{	fprintf(stderr, "Error: Opening file '%s'\n", argv[1]);
		exit(1);
	}
	
	if (write(fd, " ", 1) == -1)
	{	fprintf(stderr, "Error: write() failed\n");
		exit(1);
	}

	close(fd);
	return 0;
}