# umask(2)

    NAME
         umask - set file creation mode mask

    SYNOPSIS
         #include <sys/types.h>
         #include <sys/stat.h>

         mode_t umask(mode_t mask)

    DESCRIPTION
         Umask sets the process's file mode creation mask to mask and returns  the
         previous  value  of  the  mask.   The  low-order  9 bits of mask 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).