Article View: comp.bugs.sys5
Article #106signals - tty line discipline
From: Allan Statham
Date: Wed, 20 Sep 1989 14:25
Date: Wed, 20 Sep 1989 14:25
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----- News saved at 20 Sep 89 10:56:35 GMT I have recently discovered a problem related to tty device driver signals e.g SIGHUP , not being passed back to the controlling process. This situation occurs when a process opens,closes and re-opens a tty device using the same common line discipline code. Setpgrp() is performed before each open. The problem is due to the statements:- u.u_ttyp = &tp->t_pgrp; tp->t_pgrp = pp->p_pgrp; in the line discipline ttyopen() routine not being executed. This is caused by the fact that u.u_ttyp is not NULL on the 2nd and subsequent opens of any tty device using the same common line discipline code. A possible solution to this problem would be to insure that u.u_ttyp is set to NULL in the ttclose() routine before exiting. Could anyone who has any thoughts on this problem please mail me on: bilbo@fulcrum.bt.co.uk
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!ukc!axion!fulcrum!masalla!bilboShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!ukc!axion!fulcrum!masalla!bilbo From: bilbo@fulcrum.bt.co.uk (Allan Statham) Newsgroups: comp.bugs.sys5,comp.unix.wizards Subject: signals - tty line discipline Message-ID: <56@masalla.fulcrum.bt.co.uk> Date: 20 Sep 89 14:25:30 GMT Reply-To: bilbo@fulcrum.bt.co.uk (Allan Statham) Organization: BT Fulcrum, Birmingham, England Lines: 16