1 /* 2 * Copyright (c) 2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/bin/notty/notty.c,v 1.2 2008/06/24 21:13:26 thomas Exp $ 35 */ 36 /* 37 * NOTTY.C - program to disconnect a program from the tty and close 38 * stdin, stdout, and stderr (-012 to specify which descriptors 39 * to leave open). 40 * 41 * NOTTY [-012] <command> 42 */ 43 44 #include <sys/types.h> 45 #include <sys/ioctl.h> 46 #include <sys/time.h> 47 #include <sys/wait.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <stdarg.h> 52 #include <fcntl.h> 53 #include <signal.h> 54 #include <unistd.h> 55 56 static void usage(void); 57 58 int 59 main(int ac, char **av) 60 { 61 const char *opts = ""; 62 int ttyfd; 63 int fd; 64 65 if (ac == 1) 66 usage(); 67 68 if (av[1]) { 69 if (av[1][0] == '-') { 70 opts = av[1]; 71 ++av; 72 } 73 } 74 75 76 ttyfd = open("/dev/null", O_RDWR); 77 78 if (strchr(opts, '0') == NULL && ttyfd != 0) 79 dup2(ttyfd, 0); 80 if (strchr(opts, '1') == NULL && ttyfd != 1) 81 dup2(ttyfd, 1); 82 if (strchr(opts, '2') == NULL && ttyfd != 2) 83 dup2(ttyfd, 2); 84 85 if (ttyfd > 2) 86 close(ttyfd); 87 88 fd = open("/dev/tty", O_RDWR); 89 if (fd >= 0) { 90 ioctl(fd, TIOCNOTTY, 0); 91 close(fd); 92 } 93 94 if (fork() == 0) { 95 setsid(); 96 exit(execvp(av[1], av + 1)); 97 } 98 exit(0); 99 } 100 101 static void 102 usage(void) 103 { 104 fprintf(stderr, "notty [-012] command args ...\n"); 105 exit(1); 106 } 107 108