Columbia Kermit/kermit.zip/newsgroups/misc.19971216-19980424/000247_news@newsmaster….columbia.edu _Wed Feb 18 11:33:28 1998.msg

Internet Message Format | 2020-01-01 | 4KB

Return-Path: <[e-mail]>
Received: from newsmaster.cc.columbia.edu (newsmaster.cc.columbia.edu [128.59.35.30])
    by watsun.cc.columbia.edu (8.8.5/8.8.5) with ESMTP id LAA04642
    for <[e-mail]>; Wed, 18 Feb 1998 11:33:27 -0500 (EST)
Received: (from news@localhost)
    by newsmaster.cc.columbia.edu (8.8.5/8.8.5) id LAA17814
    for kermit.misc@watsun; Wed, 18 Feb 1998 11:33:27 -0500 (EST)
Path: news.columbia.edu!watsun.cc.columbia.edu!fdc
From: [e-mail] (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: how can i use kermit and ppp
Date: 18 Feb 1998 16:33:23 GMT
Organization: Columbia University
Lines: 59
Message-ID: <6cf2gj$8nn$[e-mail]>
References: <[e-mail]> <6cesoe$[e-mail]>
NNTP-Posting-Host: watsun.cc.columbia.edu
Xref: news.columbia.edu comp.protocols.kermit.misc:8437

In article <6cesoe$[e-mail]>,
Dmitry the Zuryanovich <[e-mail]> wrote:
: Malik Ajani ([e-mail]) wrote:
: : how can i use kermit and ppp together on linux
: : to call my isp.
:
>From the Kermit FAQ:

  http://www.columbia.edu/kermit/faq.html
  ftp://kermit.columbia.edu/kermit/faq.txt

27 How Can I Exit from C-Kermit without Hanging Up?

Many people want to be able to make a dialout connection with UNIX C-Kermit,
but then use some other software on the connection that C-Kermit made.  For
example, they want to use C-Kermit as their SLIP or PPP dialer.  But they
quickly find that when they exit from C-Kermit, that the connection is gone
before they can start the other application.

It is a fundamental property of UNIX (and VMS, and Windows 95 and NT, and most
other modern operating systems) that when a process exits, then every file that
was opened by that process is automatically closed by the operating system.  In
most cases, closing a terminal device (such as a dialout serial port) hangs up
the modem (by turning off the DTR signal).  There is nothing the process can do
about it.

However, many workarounds are possible.  Here are just a few:

   - If your C-Kermit version supports the REDIRECT command, use it to
     start the desired application (e.g. "redirect pppd").  The REDIRECT
     command runs the given application with its standard input and output
     redirected to the communications channel opened by C-Kermit's most
     recent SET LINE or SET HOST command.

   - Tell C-Kermit to SET MODEM HANGUP-METHOD RS232, and then configure
     your modem to ignore DTR (not recommended).  "Using C-Kermit", 2nd
     Ed., p.86.

   - When opening the device first from another application, feed the file
     descriptor for the device to C-Kermit using the "-l" (lowercase
     letter L) command-line option followed by the numeric file
     descriptor, e.g.  "kermit -l 6".  Then Kermit will not attempt to
     open the device, nor to change its characteristics, nor to close it
     when done, and when Kermit exits, it will still be available to the
     invoking process.  "Using C-Kermit", 2nd Ed., p.469.

   - When opening the device with C-Kermit, find out the file descriptor
     of the open device (it is given by C-Kermit's \v(ttyfd) variable) and
     then run ("!")  your other program from the C-Kermit prompt, feeding
     it the file descriptor, e.g. through shell redirection or a command
     line option (the method depends on the other program, the
     capabilities of the shell, etc).  "Using C-Kermit", 2nd Ed., p.356

   - In UNIX, after Kermit makes the connection, type "show comm" to find
     out the filename of the lock file.  Then suspend Kermit, delete the
     lock file, then start the other program and tell it to open the same
     tty device.

- Frank