usr/src/lib/libc/port/sys/ucontext.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #pragma weak _getustack = getustack
  30 #pragma weak _setustack = setustack
  31
  32 #include "lint.h"
  33 #include <ucontext.h>
  34 #include <sys/syscall.h>
  35
  36 /*
  37  * __getcontext() must be implemented in assembler, as opposed to
  38  * the other members of the SYS_context family (see __getcontext.s)
  39  * because we must be careful to get the precise context of the caller.
  40  */
  41
  42 int
  43 __setcontext(const ucontext_t *ucp)
  44 {
  45         return (syscall(SYS_context, 1, ucp));
  46 }
  47
  48 int
  49 getustack(stack_t **spp)
  50 {
  51         return (syscall(SYS_context, 2, spp));
  52 }
  53
  54 int
  55 setustack(stack_t *sp)
  56 {
  57         return (syscall(SYS_context, 3, sp));
  58 }