ack/mach/vax4/libbsd4_1a/vfork.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
.define _vfork
vfork = 66
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.align 1
_vfork:
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.data2 0x0000
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movl 16(fp),r2
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movab 1f,16(fp) ! dirty. Only one process can do return,
! so do it before forking
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ret
1:
chmk $vfork
bcs 3f
tstl r1
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beql 1f
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clrl r0
1:
jmp (r2)
3:
movl r0,_errno
mnegl $1,r0
jmp (r2)