NAME
umask - set file creation mode mask

SYNOPSIS
oumask = umask(numask)
int oumask, numask;

DESCRIPTION
Umask sets the process’s file mode creation mask to numask and
returns the previous value of the mask. The low-order 9 bits of
numask are used whenever a file is created, clearing corresponding
bits in the file mode (see chmod(2)). This clearing allows each
user to restrict the default access to his files.

The value is initially 022 (write access for owner only). The mask
is inherited by child processes.

RETURN VALUE
The previous value of the file mode mask is returned by the call.

SEE ALSO
chmod(2), mknod(2), open(2)