1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23*0Sstevel@tonic-gate /* All Rights Reserved */ 24*0Sstevel@tonic-gate /* Copyright (c) 1994 Sun Microsystems, Inc. */ 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.15 */ 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include <sys/types.h> 30*0Sstevel@tonic-gate #include <sys/param.h> 31*0Sstevel@tonic-gate #include <sys/sysmacros.h> 32*0Sstevel@tonic-gate #include <sys/systm.h> 33*0Sstevel@tonic-gate #include <sys/errno.h> 34*0Sstevel@tonic-gate #include <sys/cred.h> 35*0Sstevel@tonic-gate #include <sys/proc.h> 36*0Sstevel@tonic-gate #include <sys/debug.h> 37*0Sstevel@tonic-gate #include <sys/class.h> 38*0Sstevel@tonic-gate #include <sys/mutex.h> 39*0Sstevel@tonic-gate 40*0Sstevel@tonic-gate /* 41*0Sstevel@tonic-gate * We support the nice system call for compatibility although 42*0Sstevel@tonic-gate * the priocntl system call supports a superset of nice's functionality. 43*0Sstevel@tonic-gate * We support nice only for time sharing threads. It will fail 44*0Sstevel@tonic-gate * if called by a thread from another class. 45*0Sstevel@tonic-gate */ 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate int 48*0Sstevel@tonic-gate nice(int niceness) 49*0Sstevel@tonic-gate { 50*0Sstevel@tonic-gate int error = 0; 51*0Sstevel@tonic-gate int err, retval; 52*0Sstevel@tonic-gate kthread_id_t t; 53*0Sstevel@tonic-gate proc_t *p = curproc; 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate mutex_enter(&p->p_lock); 56*0Sstevel@tonic-gate t = p->p_tlist; 57*0Sstevel@tonic-gate do { 58*0Sstevel@tonic-gate err = CL_DONICE(t, CRED(), niceness, &retval); 59*0Sstevel@tonic-gate if (error == 0 && err) 60*0Sstevel@tonic-gate error = set_errno(err); 61*0Sstevel@tonic-gate } while ((t = t->t_forw) != p->p_tlist); 62*0Sstevel@tonic-gate mutex_exit(&p->p_lock); 63*0Sstevel@tonic-gate if (error) 64*0Sstevel@tonic-gate return (error); 65*0Sstevel@tonic-gate return (retval); 66*0Sstevel@tonic-gate } 67