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From: sandy@conexch.UUCP
Newsgroups: comp.unix.xenix
Subject: How to use SCO's ungetty
Message-ID: <144@conexch.UUCP>
Date: Tue, 27-Oct-87 15:24:47 EST
Article-I.D.: conexch.144
Posted: Tue Oct 27 15:24:47 1987
Date-Received: Tue, 17-Nov-87 07:18:03 EST
Organization: The Consultants' Exchange, Orange County, CA.  (714) 842-6348  Public Access
Lines: 22
Keywords: ungetty getty

If you are writting your own getty program and wish to be able to use SCO's
ungetty, all you need to do is the following:
 
Trap SIGUSR1 - This is the way that ungetty tells getty to "go to sleep".
   When you receive this signal, you must do the following:
   a) fclose(stdin)
   b) fclose(stdout)
   c) fclose(stderr)
   d) close(0)
   e) close(1)
   f) close(2)
   g) re-write utmp so that LOGIN is nolonger there but is now DIALOUT
   h) (void) pause()
   i) exit(0)

Note: since you are using a "pause", any signal that is redirected back to
      your getty will terminate the process.

Note again: Since getty, as far as init is concerned, has not died, a new
            getty will not be spawned until ungetty is finished! 

Sanford ( Sandy ) Zelkovitz   XBBS   714-828-0288