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