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umask(2) System Calls Manual umask(2) 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 stan- dards as follows: umask(): POSIX.1, XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry 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 per- mission bits defined in the sys/mode.h header file. Whenever a file is created (by the open(), mkdir(), or mknod() func- tion), all file permission bits set in the file mode creation mask are cleared in the mode of the created file. This clearing lets users re- strict 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 cre- ation 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) delim off umask(2)