[net.unix-wizards] SIGTSTP, Suncalc and 11's

andy (03/14/83)

Hi,

	I am trying to bring up Suncalc a visicalc type program on an
PDP 11/34 running 2.9bsd.

	The code makes a reference to the signal named SIGTSTP. I looked
in all of our manuals and can find no reference to it. I am assuming that
is only available on on Vaxen. Is this true? Can someone tell me what
SIGTSTP is supposed to do?

					Thanks,
					Andy Rodnite
					Periphonics Corp.
					4000 Veterans Memorial Hwy.
					Bohemia, NY 11716
					(516) 467-0500 ext. 278

mark.umcp-cs@UDel-Relay (04/02/83)

From:  Mark Weiser <mark.umcp-cs@UDel-Relay>

SIGTSTP is a Berkeley Unix signal which is sent by a user at a keyboard
(usually) and causes the process receiving it to stop.  Processes
which control the screen generally intercept this signal, clean up
a little, and then stop themselves by restoring the default signal
and sending themselves a SIGTSTP.  When they wakeup they can then
restore the screen to its old value.

If your code in SUNCALC is doing anything like that, you should be
able to safely throw that code out.