Messages in this thread | | | Date | Mon, 6 May 1996 14:16:51 -0400 | From | "Theodore Y. Ts'o" <> | Subject | Re: Bug in serial line hangup code ? |
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From: Peter Fox <fox@roestock.demon.co.uk> Date: Sun, 5 May 1996 13:45:11 GMT
ppp enables hangup, and on hangup closes the port. The serial driver sets info.count to 0 on hangup, even though my program still has the port open. As my program watches info.count to determine if another process has the line is open, this is a bit of a problem.
This is the way the serial driver is *designed*. Once a hangup has occurred, programs do not logically have the port "open". Access to the file descriptors has been revoked, and so they no longer can read or write to the serial port.
Furthermore, the design goal is upon hangup to shutdown the serial port entirely. This guarantees that upon a vhangup(), the modem line is dropped. Your patches change this.
How about including this lot before 2.0 ?
Your patches could potentially break all manner of programs that assume the current behavior. I am willing to revisit the design of the entire tty hangup behavior, but this will involve changing more than just the serial driver --- and just before 2.0 is not a good time to do this.
- Ted
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