39 lines
1,010 B
Groff
39 lines
1,010 B
Groff
.\" Copyright (c) 1980 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)umask.2 6.1 (Berkeley) 5/9/85
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.\"
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.TH UMASK 2 "May 9, 1985"
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.UC 4
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.SH NAME
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umask \- set file creation mode mask
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.SH SYNOPSIS
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.nf
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.ft B
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#include <sys/types.h>
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#include <sys/stat.h>
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mode_t umask(mode_t \fImask\fP)
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.ft R
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.fi
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.SH DESCRIPTION
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.B Umask
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sets the process's file mode creation mask to \fImask\fP
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and returns the previous value of the mask. The low-order
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9 bits of \fImask\fP are used whenever a file is created,
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clearing corresponding bits in the file mode
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(see
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.BR 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 value is initially 022 (write access for owner only).
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The mask is inherited by child processes.
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.SH "RETURN VALUE
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The previous value of the file mode mask is returned by the call.
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.SH SEE ALSO
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.BR chmod (2),
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.BR mknod (2),
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.BR open (2).
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