1*b30d1939SAndy Fiddaman /*********************************************************************** 2*b30d1939SAndy Fiddaman * * 3*b30d1939SAndy Fiddaman * This software is part of the ast package * 4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2012 AT&T Intellectual Property * 5*b30d1939SAndy Fiddaman * and is licensed under the * 6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 * 7*b30d1939SAndy Fiddaman * by AT&T Intellectual Property * 8*b30d1939SAndy Fiddaman * * 9*b30d1939SAndy Fiddaman * 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) * 12*b30d1939SAndy Fiddaman * * 13*b30d1939SAndy Fiddaman * Information and Software Systems Research * 14*b30d1939SAndy Fiddaman * AT&T Research * 15*b30d1939SAndy Fiddaman * Florham Park NJ * 16*b30d1939SAndy Fiddaman * * 17*b30d1939SAndy Fiddaman * Glenn Fowler <gsf@research.att.com> * 18*b30d1939SAndy Fiddaman * David Korn <dgk@research.att.com> * 19*b30d1939SAndy Fiddaman * Phong Vo <kpv@research.att.com> * 20*b30d1939SAndy Fiddaman * * 21*b30d1939SAndy Fiddaman ***********************************************************************/ 22*b30d1939SAndy Fiddaman #pragma prototyped 23*b30d1939SAndy Fiddaman 24*b30d1939SAndy Fiddaman #include <ast.h> 25*b30d1939SAndy Fiddaman 26*b30d1939SAndy Fiddaman #if _lib_setsid 27*b30d1939SAndy Fiddaman 28*b30d1939SAndy Fiddaman NoN(setsid) 29*b30d1939SAndy Fiddaman 30*b30d1939SAndy Fiddaman #else 31*b30d1939SAndy Fiddaman 32*b30d1939SAndy Fiddaman #include <ast_tty.h> 33*b30d1939SAndy Fiddaman #include <error.h> 34*b30d1939SAndy Fiddaman 35*b30d1939SAndy Fiddaman /* 36*b30d1939SAndy Fiddaman * become new process group leader and drop control tty 37*b30d1939SAndy Fiddaman */ 38*b30d1939SAndy Fiddaman 39*b30d1939SAndy Fiddaman pid_t 40*b30d1939SAndy Fiddaman setsid(void) 41*b30d1939SAndy Fiddaman { 42*b30d1939SAndy Fiddaman int pg; 43*b30d1939SAndy Fiddaman #ifdef TIOCNOTTY 44*b30d1939SAndy Fiddaman int fd; 45*b30d1939SAndy Fiddaman #endif 46*b30d1939SAndy Fiddaman 47*b30d1939SAndy Fiddaman /* 48*b30d1939SAndy Fiddaman * become a new process group leader 49*b30d1939SAndy Fiddaman */ 50*b30d1939SAndy Fiddaman 51*b30d1939SAndy Fiddaman if ((pg = getpid()) == getpgrp()) 52*b30d1939SAndy Fiddaman { 53*b30d1939SAndy Fiddaman errno = EPERM; 54*b30d1939SAndy Fiddaman return(-1); 55*b30d1939SAndy Fiddaman } 56*b30d1939SAndy Fiddaman setpgid(pg, pg); 57*b30d1939SAndy Fiddaman #ifdef TIOCNOTTY 58*b30d1939SAndy Fiddaman 59*b30d1939SAndy Fiddaman /* 60*b30d1939SAndy Fiddaman * drop the control tty 61*b30d1939SAndy Fiddaman */ 62*b30d1939SAndy Fiddaman 63*b30d1939SAndy Fiddaman if ((fd = open("/dev/tty", O_RDONLY|O_cloexec)) >= 0) 64*b30d1939SAndy Fiddaman { 65*b30d1939SAndy Fiddaman ioctl(fd, TIOCNOTTY, 0); 66*b30d1939SAndy Fiddaman close(fd); 67*b30d1939SAndy Fiddaman } 68*b30d1939SAndy Fiddaman #else 69*b30d1939SAndy Fiddaman 70*b30d1939SAndy Fiddaman /* 71*b30d1939SAndy Fiddaman * second child in s5 to avoid reacquiring the control tty 72*b30d1939SAndy Fiddaman */ 73*b30d1939SAndy Fiddaman 74*b30d1939SAndy Fiddaman #if _lib_fork && HUH920711 /* some s5's botch this */ 75*b30d1939SAndy Fiddaman switch (fork()) 76*b30d1939SAndy Fiddaman { 77*b30d1939SAndy Fiddaman case -1: 78*b30d1939SAndy Fiddaman exit(1); 79*b30d1939SAndy Fiddaman case 0: 80*b30d1939SAndy Fiddaman break; 81*b30d1939SAndy Fiddaman default: 82*b30d1939SAndy Fiddaman exit(0); 83*b30d1939SAndy Fiddaman } 84*b30d1939SAndy Fiddaman #endif 85*b30d1939SAndy Fiddaman 86*b30d1939SAndy Fiddaman #endif 87*b30d1939SAndy Fiddaman return(pg); 88*b30d1939SAndy Fiddaman } 89*b30d1939SAndy Fiddaman 90*b30d1939SAndy Fiddaman #endif 91