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 );

PARAMETERS

cmaskSpecifies 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 allows users to restrict the default access to their files. 

The mask is inherited by child processes. 

NOTES

AES Support Level:
Full use

RETURN VALUES

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

RELATED INFORMATION

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

Commands: chmod(1), mkdir(1), sh(1)