.fp 5 CW

.de Af

.ds ;G \\*(;G\\f\\$1\\$3\\f\\$2

.if !\\$4 .Af \\$2 \\$1 "\\$4" "\\$5" "\\$6" "\\$7" "\\$8" "\\$9"

..

.de aF

.ie \\$3 .ft \\$1

.el \{\

.ds ;G \&

.nr ;G \\n(.f

.Af "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7" "\\$8" "\\$9"

\\*(;G

.ft \\n(;G \}

..

.de L

.aF 5 \\n(.f "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"

..

.de LR

.aF 5 1 "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"

..

.de RL

.aF 1 5 "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"

..

.de EX \" start example

.ta 1i 2i 3i 4i 5i 6i

.PP

.RS

.PD 0

.ft 5

.nf

..

.de EE \" end example

.fi

.ft

.PD

.RE

.PP

..

.TH SIG 3

.SH NAME

sig \- signal interface routines

.SH SYNOPSIS

.L "#include <ast.h>"

.L "#include <sig.h>"

.sp

.L "int sigunblock(int sig);"

.L "int sigcritical(int op);"

.SH DESCRIPTION

.L sigunblock

is called to

unblocks the signal

.L sig

from within a handler currently servicing

.LR sig .

.PP

.L sigcritical

controls a critical region for the

.LR SIGINT ,

.L SIGQUIT

and

.L SIGHUP

signals.

.L "op > 0"

pushes the region,

.L "op == 0"

pops the region, and

.L "op < 0"

returns non-zero if any signals are being held in the current

critical region.

Signal critical regions may be nested.

The current critical region level is returned,

.L \-1

on error.

.SH "SEE ALSO"

signal(2)