Ultrix-3.1/src/libc/sys/fork.s

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/ SCCSID: @(#)fork.s	3.0	4/22/86
/
//////////////////////////////////////////////////////////////////////
/   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    /
/   All Rights Reserved. 					     /
/   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      /
//////////////////////////////////////////////////////////////////////
/
/ C library -- fork

/ pid = fork();
/
/ pid == 0 in child process; pid == -1 means error return
/ in child, parents id is in par_uid if needed

.globl	_fork, _par_uid
.globl	cerror
.fork = 2.

_fork:
	mov	r5,-(sp)
	mov	sp,r5
	sys	.fork
		br 1f
	bec	2f
	jmp	cerror
1:
	mov	r0,_par_uid
	clr	r0
2:
	mov	(sp)+,r5
	rts	pc
.bss
_par_uid: .=.+2