umask(2)                                                 umask(2)



     NAME
          umask - set and get file creation mask

     SYNOPSIS
          int umask (cmask)
          int cmask;

     DESCRIPTION
          umask sets the process's file mode creation mask to cmask
          and returns the previous value of the mask.  Only the low-
          order 9 bits of cmask and the file mode creation mask are
          used.

          The file mode creation mask is used whenever a file is
          created by creat(2), mknod(2) or open(2).  The actual mode
          (see chmod(2)) of the newly-created file is the difference
          between the given mode and cmask.  In other words, cmask
          shows the bits to be turned off when a new file is created.

          The previous value of cmask is returned by the call.  The
          value is initially 022, which is an octal ``mask'' number
          representing the complement of the desired mode.  `022' here
          means that no permissions are withheld from the owner, but
          write permission is forbidden to group and to others. Its
          complement, the mode of the file, would be 755.  The file
          mode creation mask is inherited by child processes.

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

     SEE ALSO
          mkdir(1), sh(1), chmod(2), creat(2), mknod(2), open(2).






















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