Re: Forcing DTR low on modem to hangup from Linux?

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#1158

From: Rob Janssen
Date: Wed, 20 Jul 1994 07:55

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In <30hcgo$rc@froggy.demon.co.uk> jrmt@froggy.demon.co.uk (Jon Thackray) writes:

>I've been trying to get a 'hangup' program to run after PPP terminates,
>to hang up the modem. SLIP (via the DIP program) use the '+++' and 'ATH'
>commands, but these don't seem to work if the modem is busy receiving data.
>(I think the manual says that '+++' needs a 1 second gap)

>What's the best way to force DTR low (it is DTR, isn't it?), so that the
>modem is /guaranteed/ to go offline ...? Would I need to add a call to the
>kernel to be able to do this, or could it be done from user mode?

Normally, just closing the port should do that.
When it doesn't, make sure the HUPCL bit is set in the termios structure.

Rob
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References: <30hcgo$rc@froggy.demon.co.uk>

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From: rob@pe1chl.ampr.org (Rob Janssen)
Subject: Re: Forcing DTR low on modem to hangup from Linux?
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References: <30hcgo$rc@froggy.demon.co.uk>
Date: Wed, 20 Jul 1994 07:55:29 GMT
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