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| 1 | .\" Copyright (c) 1980 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)umask.2 6.1 (Berkeley) 5/9/85
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| 6 | .\"
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| 7 | .TH UMASK 2 "May 9, 1985"
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| 8 | .UC 4
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| 9 | .SH NAME
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| 10 | umask \- set file creation mode mask
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | #include <sys/types.h>
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| 15 | #include <sys/stat.h>
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| 16 |
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| 17 | mode_t umask(mode_t \fImask\fP)
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| 18 | .ft R
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| 19 | .fi
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| 20 | .SH DESCRIPTION
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| 21 | .B Umask
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| 22 | sets the process's file mode creation mask to \fImask\fP
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| 23 | and returns the previous value of the mask. The low-order
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| 24 | 9 bits of \fImask\fP are used whenever a file is created,
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| 25 | clearing corresponding bits in the file mode
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| 26 | (see
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| 27 | .BR chmod (2)).
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| 28 | This clearing allows each user to restrict the default access
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| 29 | to his files.
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| 30 | .PP
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| 31 | The value is initially 022 (write access for owner only).
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| 32 | The mask is inherited by child processes.
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| 33 | .SH "RETURN VALUE
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| 34 | The previous value of the file mode mask is returned by the call.
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| 35 | .SH SEE ALSO
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| 36 | .BR chmod (2),
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| 37 | .BR mknod (2),
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| 38 | .BR open (2).
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