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89 lines
2.7 KiB
Groff
89 lines
2.7 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)umask.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt UMASK 2
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.Os
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.Sh NAME
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.Nm umask
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.Nd set file creation mode mask
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/stat.h
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.Ft mode_t
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.Fn umask "mode_t numask"
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.Sh DESCRIPTION
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The
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.Fn umask
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routine sets the process's file mode creation mask to
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.Fa numask
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and returns the previous value of the mask.
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The 9 low-order
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access permission
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bits of
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.Fa numask
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are used by system calls, including
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.Xr open 2 ,
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.Xr mkdir 2 ,
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and
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.Xr mkfifo 2 ,
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to turn off corresponding bits
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requested in file mode.
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(See
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.Xr chmod 2 ) .
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This clearing allows each user to restrict the default access
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to his files.
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.Pp
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The default mask value is S_IWGRP|S_IWOTH (022, write access for the
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owner only).
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Child processes inherit the mask of the calling process.
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.Sh RETURN VALUES
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The previous value of the file mode mask is returned by the call.
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.Sh ERRORS
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The
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.Fn umask
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system call is always successful.
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.Sh SEE ALSO
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.Xr chmod 2 ,
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.Xr mkfifo 2 ,
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.Xr mknod 2 ,
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.Xr open 2
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.Sh STANDARDS
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The
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.Fn umask
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system call is expected to conform to
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.St -p1003.1-90 .
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.Sh HISTORY
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The
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.Fn umask
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function appeared in
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.At v7 .
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