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	1	.\" $NetBSD: umask.2,v 1.6 1995/02/27 12:39:06 cgd Exp $
	2	.\"
	3	.\" Copyright (c) 1980, 1991, 1993
	4	.\" The Regents of the University of California. All rights reserved.
	5	.\"
	6	.\" Redistribution and use in source and binary forms, with or without
	7	.\" modification, are permitted provided that the following conditions
	8	.\" are met:
	9	.\" 1. Redistributions of source code must retain the above copyright
	10	.\" notice, this list of conditions and the following disclaimer.
	11	.\" 2. Redistributions in binary form must reproduce the above copyright
	12	.\" notice, this list of conditions and the following disclaimer in the
	13	.\" documentation and/or other materials provided with the distribution.
	14	.\" 3. All advertising materials mentioning features or use of this software
	15	.\" must display the following acknowledgement:
	16	.\" This product includes software developed by the University of
	17	.\" California, Berkeley and its contributors.
	18	.\" 4. Neither the name of the University nor the names of its contributors
	19	.\" may be used to endorse or promote products derived from this software
	20	.\" without specific prior written permission.
	21	.\"
	22	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	.\" SUCH DAMAGE.
	33	.\"
	34	.\" @(#)umask.2 8.1 (Berkeley) 6/4/93
	35	.\"
	36	.Dd June 4, 1993
	37	.Dt UMASK 2
	38	.Os BSD 4
	39	.Sh NAME
	40	.Nm umask
	41	.Nd set file creation mode mask
	42	.Sh SYNOPSIS
	43	.Fd #include <sys/stat.h>
	44	.Ft mode_t
	45	.Fo umask
	46	.Fa "mode_t cmask"
	47	.Fc
	48	.Sh DESCRIPTION
	49	The
	50	.Fn umask
	51	routine sets the process's file mode creation mask to
	52	.Fa cmask
	53	and returns the previous value of the mask.
	54	The 9 low-order access permission bits of
	55	.Fa cmask
	56	are used by system calls, including
	57	.Xr open 2 ,
	58	.Xr mkdir 2 ,
	59	.Xr mkfifo 2 ,
	60	and
	61	.Xr mknod 2
	62	to turn off corresponding bits
	63	requested in file mode.
	64	(See
	65	.Xr chmod 2 ) .
	66	This clearing allows each user to restrict the default access
	67	to his files.
	68	.Pp
	69	The default mask value is S_IWGRP\|S_IWOTH (022, write access for the
	70	owner only).
	71	Child processes inherit the mask of the calling process.
	72	.Sh RETURN VALUES
	73	The previous value of the file mode mask is returned by the call.
	74	.Sh ERRORS
	75	The
	76	.Fn umask
	77	function is always successful.
	78	.Sh LEGACY SYNOPSIS
	79	.Fd #include <sys/types.h>
	80	.Fd #include <sys/stat.h>
	81	.Pp
	82	The include file
	83	.In sys/types.h
	84	is necessary.
	85	.Sh SEE ALSO
	86	.Xr chmod 2 ,
	87	.Xr mkdir 2 ,
	88	.Xr mkfifo 2 ,
	89	.Xr mknod 2 ,
	90	.Xr open 2 ,
	91	.Xr compat 5
	92	.Sh STANDARDS
	93	The
	94	.Fn umask
	95	function call is expected to
	96	conform to
	97	.St -p1003.1-88 .