cpuctl_fj_simple_echo.c revision 1e6f5a673655551de5734ff31ef48cd63b604e6d 
1/******************************************************************************/
2/*                                                                            */
3/* Copyright (c) 2009 FUJITSU LIMITED                                         */
4/*                                                                            */
5/* This program is free software;  you can redistribute it and/or modify      */
6/* it under the terms of the GNU General Public License as published by       */
7/* the Free Software Foundation; either version 2 of the License, or          */
8/* (at your option) any later version.                                        */
9/*                                                                            */
10/* This program is distributed in the hope that it will be useful,            */
11/* but WITHOUT ANY WARRANTY;  without even the implied warranty of            */
12/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See                  */
13/* the GNU General Public License for more details.                           */
14/*                                                                            */
15/* You should have received a copy of the GNU General Public License          */
16/* along with this program;  if not, write to the Free Software               */
17/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA    */
18/*                                                                            */
19/* Author: Miao Xie <miaox@cn.fujitsu.com>                                    */
20/* Restructure for LTP: Shi Weihua <shiwh@cn.fujitsu.com>                     */
21/*                                                                            */
22/******************************************************************************/
23/*++ simple_echo.c
24 *
25 * DESCRIPTION:
26 *	The command "echo" can't return the errno. So we write this program to
27 * instead of "echo".
28 *
29 * Author:
30 * -------
31 * 2008/04/17 created by Miao Xie@FNST
32 *
33 */
34
35#include <sys/types.h>
36#include <sys/stat.h>
37#include <err.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <libgen.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45
46int main(int argc, char **argv)
47{
48	int fd = 1;
49
50	if (argc != 2 && argc != 3) {
51		fprintf(stderr, "usage: %s STRING [ostream]\n",
52		    basename(argv[0]));
53		exit(1);
54	}
55
56	if (argc == 3)
57		if ((fd = open(argv[2], O_RDWR|O_SYNC)) == -1)
58			err(errno, "%s", argv[2]);
59
60	if (write(fd, argv[1], strlen(argv[1])) == -1)
61		err(errno, "write error");
62
63	if (fd != 1)
64		if (close(fd) == -1)
65			err(errno, "close error");
66	return 0;
67}