1da2e3ebdSchin /*********************************************************************** 2da2e3ebdSchin * * 3da2e3ebdSchin * This software is part of the ast package * 4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2012 AT&T Intellectual Property * 5da2e3ebdSchin * and is licensed under the * 6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 * 77c2fbfb3SApril Chin * by AT&T Intellectual Property * 8da2e3ebdSchin * * 9da2e3ebdSchin * A copy of the License is available at * 10*b30d1939SAndy Fiddaman * http://www.eclipse.org/org/documents/epl-v10.html * 11*b30d1939SAndy Fiddaman * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12da2e3ebdSchin * * 13da2e3ebdSchin * Information and Software Systems Research * 14da2e3ebdSchin * AT&T Research * 15da2e3ebdSchin * Florham Park NJ * 16da2e3ebdSchin * * 17da2e3ebdSchin * Glenn Fowler <gsf@research.att.com> * 18da2e3ebdSchin * David Korn <dgk@research.att.com> * 19da2e3ebdSchin * Phong Vo <kpv@research.att.com> * 20da2e3ebdSchin * * 21da2e3ebdSchin ***********************************************************************/ 22da2e3ebdSchin #pragma prototyped 23da2e3ebdSchin 24da2e3ebdSchin #include <ast.h> 25da2e3ebdSchin 26da2e3ebdSchin #if _lib_setsid 27da2e3ebdSchin 28da2e3ebdSchin NoN(setsid) 29da2e3ebdSchin 30da2e3ebdSchin #else 31da2e3ebdSchin 32da2e3ebdSchin #include <ast_tty.h> 33da2e3ebdSchin #include <error.h> 34da2e3ebdSchin 35da2e3ebdSchin /* 36da2e3ebdSchin * become new process group leader and drop control tty 37da2e3ebdSchin */ 38da2e3ebdSchin 39da2e3ebdSchin pid_t 40da2e3ebdSchin setsid(void) 41da2e3ebdSchin { 42da2e3ebdSchin int pg; 43da2e3ebdSchin #ifdef TIOCNOTTY 44da2e3ebdSchin int fd; 45da2e3ebdSchin #endif 46da2e3ebdSchin 47da2e3ebdSchin /* 48da2e3ebdSchin * become a new process group leader 49da2e3ebdSchin */ 50da2e3ebdSchin 51da2e3ebdSchin if ((pg = getpid()) == getpgrp()) 52da2e3ebdSchin { 53da2e3ebdSchin errno = EPERM; 54da2e3ebdSchin return(-1); 55da2e3ebdSchin } 56da2e3ebdSchin setpgid(pg, pg); 57da2e3ebdSchin #ifdef TIOCNOTTY 58da2e3ebdSchin 59da2e3ebdSchin /* 60da2e3ebdSchin * drop the control tty 61da2e3ebdSchin */ 62da2e3ebdSchin 63*b30d1939SAndy Fiddaman if ((fd = open("/dev/tty", O_RDONLY|O_cloexec)) >= 0) 64da2e3ebdSchin { 65da2e3ebdSchin ioctl(fd, TIOCNOTTY, 0); 66da2e3ebdSchin close(fd); 67da2e3ebdSchin } 68da2e3ebdSchin #else 69da2e3ebdSchin 70da2e3ebdSchin /* 71da2e3ebdSchin * second child in s5 to avoid reacquiring the control tty 72da2e3ebdSchin */ 73da2e3ebdSchin 74da2e3ebdSchin #if _lib_fork && HUH920711 /* some s5's botch this */ 75da2e3ebdSchin switch (fork()) 76da2e3ebdSchin { 77da2e3ebdSchin case -1: 78da2e3ebdSchin exit(1); 79da2e3ebdSchin case 0: 80da2e3ebdSchin break; 81da2e3ebdSchin default: 82da2e3ebdSchin exit(0); 83da2e3ebdSchin } 84da2e3ebdSchin #endif 85da2e3ebdSchin 86da2e3ebdSchin #endif 87da2e3ebdSchin return(pg); 88da2e3ebdSchin } 89da2e3ebdSchin 90da2e3ebdSchin #endif 91