kernel/syscall/sigsuspend.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 /*
  27  * Copyright 1994-2003 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 #include <sys/param.h>
  34 #include <sys/types.h>
  35 #include <sys/sysmacros.h>
  36 #include <sys/systm.h>
  37 #include <sys/errno.h>
  38 #include <sys/proc.h>
  39 #include <sys/fault.h>
  40 #include <sys/procset.h>
  41 #include <sys/signal.h>
  42 #include <sys/schedctl.h>
  43 #include <sys/debug.h>
  44
  45 int
  46 sigsuspend(sigset_t *setp)
  47 {
  48         sigset_t set;
  49         k_sigset_t kset;
  50         proc_t *p = curproc;
  51
  52         if (copyin((caddr_t)setp, (caddr_t)&set, sizeof (sigset_t)))
  53                 return (set_errno(EFAULT));
  54         sigutok(&set, &kset);
  55         mutex_enter(&p->p_lock);
  56         schedctl_finish_sigblock(curthread);
  57         ttolwp(curthread)->lwp_sigoldmask = curthread->t_hold;
  58         curthread->t_hold = kset;
  59         curthread->t_sig_check = 1;     /* so post-syscall will re-evaluate */
  60         curthread->t_flag |= T_TOMASK;
  61         /* pause() */
  62         while (cv_wait_sig_swap(&curthread->t_delay_cv, &p->p_lock))
  63                 ;
  64         mutex_exit(&p->p_lock);
  65         return (set_errno(EINTR));
  66 }