[apple/libc.git] / compat-43 / sigblock.2

.\" Copyright (c) 1983, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     @(#)sigblock.2	8.1 (Berkeley) 6/2/93
.\" $FreeBSD: src/lib/libc/compat-43/sigblock.2,v 1.5.2.2 2001/12/21 10:07:08 ru Exp $
.\"
.Dd June 2, 1993
.Dt SIGBLOCK 2
.Os
.Sh NAME
.Nm sigblock
.Nd block signals
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In signal.h
.Ft int
.Fn sigblock "int mask"
.Ft int
.Fn sigmask signum
.Sh DESCRIPTION
.Bf -symbolic
This interface is made obsolete by
.Xr sigprocmask 2 .
.Ef
.Pp
.Fn Sigblock
adds the signals specified in
.Fa mask
to the set of signals currently
being blocked from delivery.
Signals are blocked if the
corresponding bit in
.Fa mask
is a 1; the macro
.Fn sigmask
is provided to construct the mask for a given
.Fa signum .
.Pp
It is not possible to block
.Dv SIGKILL
or
.Dv SIGSTOP ;
this restriction is silently
imposed by the system.
.Sh RETURN VALUES
The previous set of masked signals is returned.
.Sh SEE ALSO
.Xr kill 2 ,
.Xr sigaction 2 ,
.Xr sigprocmask 2 ,
.Xr sigsetmask 2 ,
.Xr sigsetops 3
.Sh HISTORY
The
.Fn sigblock
function call appeared in
.Bx 4.2
and has been deprecated.
Commit	Line	Data
5b2abdfb	1	.\" Copyright (c) 1983, 1991, 1993
e9ce8d39 A	2	.\" The Regents of the University of California. All rights reserved.
	3	.\"
	4	.\" Redistribution and use in source and binary forms, with or without
	5	.\" modification, are permitted provided that the following conditions
	6	.\" are met:
	7	.\" 1. Redistributions of source code must retain the above copyright
	8	.\" notice, this list of conditions and the following disclaimer.
	9	.\" 2. Redistributions in binary form must reproduce the above copyright
	10	.\" notice, this list of conditions and the following disclaimer in the
	11	.\" documentation and/or other materials provided with the distribution.
	12	.\" 3. All advertising materials mentioning features or use of this software
	13	.\" must display the following acknowledgement:
	14	.\" This product includes software developed by the University of
	15	.\" California, Berkeley and its contributors.
	16	.\" 4. Neither the name of the University nor the names of its contributors
	17	.\" may be used to endorse or promote products derived from this software
	18	.\" without specific prior written permission.
	19	.\"
	20	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	.\" SUCH DAMAGE.
	31	.\"
5b2abdfb A	32	.\" @(#)sigblock.2 8.1 (Berkeley) 6/2/93
5b2abdfb A	33	.\" $FreeBSD: src/lib/libc/compat-43/sigblock.2,v 1.5.2.2 2001/12/21 10:07:08 ru Exp $
e9ce8d39	34	.\"
5b2abdfb A	35	.Dd June 2, 1993
5b2abdfb A	36	.Dt SIGBLOCK 2
e9ce8d39 A	37	.Os
e9ce8d39 A	38	.Sh NAME
5b2abdfb A	39	.Nm sigblock
5b2abdfb A	40	.Nd block signals
e9ce8d39 A	41	.Sh LIBRARY
	42	.Lb libc
	43	.Sh SYNOPSIS
5b2abdfb	44	.In signal.h
e9ce8d39	45	.Ft int
5b2abdfb A	46	.Fn sigblock "int mask"
	47	.Ft int
	48	.Fn sigmask signum
e9ce8d39	49	.Sh DESCRIPTION
5b2abdfb A	50	.Bf -symbolic
	51	This interface is made obsolete by
	52	.Xr sigprocmask 2 .
	53	.Ef
	54	.Pp
	55	.Fn Sigblock
	56	adds the signals specified in
	57	.Fa mask
	58	to the set of signals currently
	59	being blocked from delivery.
	60	Signals are blocked if the
	61	corresponding bit in
	62	.Fa mask
	63	is a 1; the macro
	64	.Fn sigmask
	65	is provided to construct the mask for a given
	66	.Fa signum .
	67	.Pp
	68	It is not possible to block
	69	.Dv SIGKILL
	70	or
	71	.Dv SIGSTOP ;
	72	this restriction is silently
	73	imposed by the system.
e9ce8d39	74	.Sh RETURN VALUES
5b2abdfb	75	The previous set of masked signals is returned.
e9ce8d39	76	.Sh SEE ALSO
5b2abdfb A	77	.Xr kill 2 ,
	78	.Xr sigaction 2 ,
	79	.Xr sigprocmask 2 ,
	80	.Xr sigsetmask 2 ,
	81	.Xr sigsetops 3
e9ce8d39 A	82	.Sh HISTORY
e9ce8d39 A	83	The
5b2abdfb A	84	.Fn sigblock
	85	function call appeared in
	86	.Bx 4.2
	87	and has been deprecated.