# 2.11BSD#431 - /usr/man/cat8/gt307.0

    GT307(8)	    UNIX Programmer's Manual		 GT307(8)

    NAME
         gt307 - read and set GT307 clock board

    SYNOPSIS
         gt307 [ -d n ] [ -l ] [ yymmddhhmm.ss ]

    DESCRIPTION
         The gt307 is used to read and/or set a Computer Products Inc
         GT307 clock calendar board.  If the date argument is not
         given the board is read but not written.

         The options are:

         -d n		 sets Daylight Savings Time (DST) on if n
    			 is 1, off if n if 0.

         -l                  switches output between long and short
    			 formats.  The short format is suitable
    			 for input to the date(8) command.

         gt307 is a user mode program only (not a standalone/bootable
         program like toyset ).  The kernel does not know how to read
         a GT307 clock.  Thus the recommended use of gt307 is to set
         the system time from within the rc(8) file:

    	       date `/sbin/gt307 -l`

    FILES
         None.

    SEE ALSO
         date(8), phys(2), rc(8)

    BUGS
         gt307 uses the phys(2) syscall to access the I/O page and
         thus can only be run by the superuser. Making this program
         setuid (so that users can read the GT307 board) could be a
         large threat to system integrity in the event of bugs in the
         program.  It is NOT recommended that gt307 be made setuid.

    HISTORY
         The gt307 command first appeared in 2.11BSD.   It was con-
         tributed by Robin Birch
         (robin@falstaf.demon.co.uk).

         The Makefile, manpage and integration into 2.11BSD were done
         by Steven Schultz (sms@moe.2bsd.com).

    Printed 11/24/99	  July 21, 1999                         1

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