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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ 18 /* */ 19 /* Author: Miao Xie <miaox (at) cn.fujitsu.com> */ 20 /* Restructure for LTP: Shi Weihua <shiwh (at) 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 46 int 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 } 68
