UMASK
Section: System Calls (2)
Index
Return to Main Contents
BSD mandoc
BSD 4
NAME
umask
- set file creation mode mask
SYNOPSIS
Fd #include <sys/types.h>
Fd #include <sys/stat.h>
Ft mode_t
Fn umask mode_t numask
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
open(2),
mkdir(2),
mkfifo(2)
and
mknod(2)
to turn off corresponding bits
requested in file mode.
(See
chmod(2)).
This clearing allows each user to restrict the default access
to his files.
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.
RETURN VALUES
The previous value of the file mode mask is returned by the call.
ERRORS
The
Fn umask
function is always successful.
SEE ALSO
chmod(2),
mkdir(2),
mkfifo(2),
mknod(2),
open(2)
STANDARDS
The
Fn umask
function call is expected to
conform to
St -p1003.1-88 .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- ERRORS
-
- SEE ALSO
-
- STANDARDS
-
This document was created by
man2html,
using the manual pages.
Time: 16:28:59 GMT, April 18, 2022