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BSD 4.3reno

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(SYSLIBC_SCCS) && !defined(lint)
	.asciz "@(#)Ovfork.s	5.1 (Berkeley) 4/23/90"
#endif /* SYSLIBC_SCCS and not lint */

#include "SYS.h"

/*
 * pid = vfork();
 *
 * %edx == 0 in parent process, %edx == 1 in child process.
 * %eax == pid of child in parent, %eax == pid of parent in child.
 *
 */
	.set	vfork,66
.globl	_vfork

_vfork:
	popl	%ecx		/* my rta into ecx */
	movl	$vfork, %eax
	LCALL(7,0)
	jb	verror
vforkok:
	cmpl	$0,%edx		/* child process? */
	jne	child		/* yes */
	jmp 	parent 
.globl	_errno
verror:
	movl	%eax,_errno
	movl	$-1,%eax
	jmp	%ecx
child:
	movl	$0,%eax
parent:
	jmp	%ecx

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