1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * Phong Vo <kpv@research.att.com> * 20*4887Schin * * 21*4887Schin ***********************************************************************/ 22*4887Schin #pragma prototyped 23*4887Schin 24*4887Schin #include <ast.h> 25*4887Schin 26*4887Schin #if _lib_setpgid 27*4887Schin 28*4887Schin NoN(setpgid) 29*4887Schin 30*4887Schin #else 31*4887Schin 32*4887Schin #include <error.h> 33*4887Schin 34*4887Schin #ifndef ENOSYS 35*4887Schin #define ENOSYS EINVAL 36*4887Schin #endif 37*4887Schin 38*4887Schin #if _lib_setpgrp2 39*4887Schin #define setpgrp setpgrp2 40*4887Schin #else 41*4887Schin #if _lib_BSDsetpgrp 42*4887Schin #define _lib_setpgrp2 1 43*4887Schin #define setpgrp BSDsetpgrp 44*4887Schin #else 45*4887Schin #if _lib_wait3 46*4887Schin #define _lib_setpgrp2 1 47*4887Schin #endif 48*4887Schin #endif 49*4887Schin #endif 50*4887Schin 51*4887Schin #if _lib_setpgrp2 52*4887Schin extern int setpgrp(int, int); 53*4887Schin #else 54*4887Schin extern int setpgrp(void); 55*4887Schin #endif 56*4887Schin 57*4887Schin /* 58*4887Schin * set process group id 59*4887Schin */ 60*4887Schin 61*4887Schin int 62*4887Schin setpgid(pid_t pid, pid_t pgid) 63*4887Schin { 64*4887Schin #if _lib_setpgrp2 65*4887Schin return(setpgrp(pid, pgid)); 66*4887Schin #else 67*4887Schin #if _lib_setpgrp 68*4887Schin int caller = getpid(); 69*4887Schin 70*4887Schin if ((pid == 0 || pid == caller) && (pgid == 0 || pgid == caller)) 71*4887Schin return(setpgrp()); 72*4887Schin errno = EINVAL; 73*4887Schin #else 74*4887Schin errno = ENOSYS; 75*4887Schin #endif 76*4887Schin return(-1); 77*4887Schin #endif 78*4887Schin } 79*4887Schin 80*4887Schin #endif 81