Content-type: text/html Man page of umask

umask

Section: System Calls (2)
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NAME

umask - Sets and gets the value of the file creation mask  

SYNOPSIS

#include <sys/types.h>

#include <sys/stat.h>

mode_t umask (        mode_t cmask );
 

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

umask(): POSIX.1, XPG4, XPG4-UNIX

Refer to the standards(5) reference page for more information about industry standards and associated tags.  

PARAMETERS

Specifies the value of the file mode creation mask.  

DESCRIPTION

The umask() function sets the file mode creation mask of the process to the value of the cmask parameter and returns the previous value of the mask. The cmask parameter is constructed by logically ORing file permission bits defined in the sys/mode.h header file.

Whenever a file is created (by the open(), mkdir(), or mknod() function), all file permission bits set in the file mode creation mask are cleared in the mode of the created file. This clearing lets users restrict the default access to their files.

The mask is inherited by child processes.  

RETURN VALUES

Upon successful completion, the previous value of the file mode creation mask is returned.  

RELATED INFORMATION

Commands:  chmod(1), mkdir(1), Bourne shell sh(1b), POSIX shell sh(1p), umask(1)

Functions:  chmod(2), mkdir(2), mknod(2), open(2), stat(2)

Standards:  standards(5)

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Index

NAME
SYNOPSIS
STANDARDS
PARAMETERS
DESCRIPTION
RETURN VALUES
RELATED INFORMATION

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Time: 02:40:14 GMT, October 02, 2010