Path: utzoo!utgpu!water!watmath!clyde!rutgers!umd5!vrdxhq!dgis!csed-1!roskos
From: roskos@csed-1.UUCP (Eric Roskos)
Newsgroups: comp.os.minix
Subject: Simple (?) question re signals
Message-ID: <256@csed-47.csed-1.UUCP>
Date: 21 Jan 88 03:42:38 GMT
Organization: IDA, Alexandria, VA
Lines: 21

This is something that has puzzled me for awhile.

If you are logged in under Minix, and you type the character that generates
a SIGINT (the DEL key by default), what determines which processes the signal
gets distributed to?

On the version of Minix I am running the signal only goes to the shell.
I thought maybe I'd lost some code when I applied the 1.2 changes, but when
I look in the textbook, I can't seem to find it.  It looks like the code
assumes that there's an "appropriate" process at a process slot whose
position depends on the tty the character was typed on, and that it
sends the signal to that one, but no other.  Is that true, or am I
missing something?  Can you be certain that the process at a given process
slot will always be the right one?  (E.g., what if a fork() happens to
occur just as your shell exits?)

The code I'm looking at at the moment is on line 382 of file tty.c in
the version 1.2 sources.
-- 
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Eric Roskos, IDA (...dgis!csed-1!roskos or csed-1!roskos@HC.DSPO.GOV)