89 lines
2.7 KiB
Groff
89 lines
2.7 KiB
Groff
.\" Copyright (c) 1980, 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.
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)umask.2 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt UMASK 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm umask
|
|
.Nd set file creation mode mask
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/stat.h
|
|
.Ft mode_t
|
|
.Fn umask "mode_t numask"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn umask
|
|
routine sets the process's file mode creation mask to
|
|
.Fa numask
|
|
and returns the previous value of the mask.
|
|
The 9 low-order
|
|
access permission
|
|
bits of
|
|
.Fa numask
|
|
are used by system calls, including
|
|
.Xr open 2 ,
|
|
.Xr mkdir 2 ,
|
|
and
|
|
.Xr mkfifo 2 ,
|
|
to turn off corresponding bits
|
|
requested in file mode.
|
|
(See
|
|
.Xr chmod 2 ) .
|
|
This clearing allows each user to restrict the default access
|
|
to his files.
|
|
.Pp
|
|
The default mask value is S_IWGRP|S_IWOTH (022, write access for the
|
|
owner only).
|
|
Child processes inherit the mask of the calling process.
|
|
.Sh RETURN VALUES
|
|
The previous value of the file mode mask is returned by the call.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn umask
|
|
system call is always successful.
|
|
.Sh SEE ALSO
|
|
.Xr chmod 2 ,
|
|
.Xr mkfifo 2 ,
|
|
.Xr mknod 2 ,
|
|
.Xr open 2
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn umask
|
|
system call is expected to conform to
|
|
.St -p1003.1-90 .
|
|
.Sh HISTORY
|
|
The
|
|
.Fn umask
|
|
function appeared in
|
|
.At v7 .
|