Home | History | Annotate | Download | only in sys
      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 2006 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 	.file	"forkx.s"
     28 
     29 #include "SYS.h"
     30 
     31 /*
     32  * pid = __forkx(flags);
     33  *
     34  * syscall trap: forksys(0, flags)
     35  *
     36  * From the syscall:
     37  * %edx == 0 in parent process, %edx = 1 in child process.
     38  * %eax == pid of child in parent, %eax == pid of parent in child.
     39  *
     40  * The child gets a zero return value.
     41  * The parent gets the pid of the child.
     42  */
     43 
     44 	ENTRY(__forkx)
     45 	popl	%ecx
     46 	pushl	$0
     47 	pushl	%ecx
     48 	SYSTRAP_2RVALS(forksys)
     49 	popl	%ecx
     50 	movl	%ecx, 0(%esp)
     51 	SYSCERROR
     52 	testl	%edx, %edx
     53 	jz	1f		/* jump if parent */
     54 	xorl	%eax, %eax	/* child, return (0) */
     55 1:
     56 	RET
     57 	SET_SIZE(__forkx)
     58