usr/src/lib/libc/compat-43/sigblock.2

.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)sigblock.2	6.2 (Berkeley) %G%
.\"
.TH SIGBLOCK 2 ""
.UC 5
.SH NAME
sigblock \- block signals
.SH SYNOPSIS
.nf
.B #include <signal.h>

.B sigblock(mask);
.B int mask;

.B mask = sigmask(signum)
.SH DESCRIPTION
.I Sigblock
causes the signals specified in
.I mask
to be added to the set of signals currently
being blocked from delivery.
Signals are blocked if the
corresding bit in
.I mask
is a 1; the macro
.I sigmask
is provided to construct the mask for a given
.IR signum .
.PP
It is not possible to block SIGKILL,
SIGSTOP, or SIGCONT;  this restriction is silently
imposed by the system.
.SH "RETURN VALUE
The previous set of masked signals is returned.
.SH "SEE ALSO"
kill(2), sigvec(2), sigsetmask(2)
Commit	Line	Data
	1	.\" Copyright (c) 1983 Regents of the University of California.
	2	.\" All rights reserved. The Berkeley software License Agreement
	3	.\" specifies the terms and conditions for redistribution.
	4	.\"
	5	.\" @(#)sigblock.2 6.2 (Berkeley) %G%
	6	.\"
	7	.TH SIGBLOCK 2 ""
	8	.UC 5
	9	.SH NAME
	10	sigblock \- block signals
	11	.SH SYNOPSIS
	12	.nf
	13	.B #include <signal.h>
	14
	15	.B sigblock(mask);
	16	.B int mask;
	17
	18	.B mask = sigmask(signum)
	19	.SH DESCRIPTION
	20	.I Sigblock
	21	causes the signals specified in
	22	.I mask
	23	to be added to the set of signals currently
	24	being blocked from delivery.
	25	Signals are blocked if the
	26	corresding bit in
	27	.I mask
	28	is a 1; the macro
	29	.I sigmask
	30	is provided to construct the mask for a given
	31	.IR signum .
	32	.PP
	33	It is not possible to block SIGKILL,
	34	SIGSTOP, or SIGCONT; this restriction is silently
	35	imposed by the system.
	36	.SH "RETURN VALUE
	37	The previous set of masked signals is returned.
	38	.SH "SEE ALSO"
	39	kill(2), sigvec(2), sigsetmask(2)