plot.thickness++ (Re: Core dump with tip (ucom0 -> external modem))

From: Mike Hunter (mhunter_at_ack.Berkeley.EDU)
Date: 04/27/04

  • Next message: Matt Freitag: "Re: Loosing STDOUT after file rotation" 
    Date: Tue, 27 Apr 2004 11:28:23 -0700
To: freebsd-hackers@freebsd.org

    I got an interesting clue by trying ECU. Check this out:

    ECU is a dialer type program. I told it to use /dev/ucom0 to dial my desk
    phone number, and it showed itself trying to issue a bunch of commands to
    the modem, but each time they came back and said "missed expected carriage
    return". It eventually gave up, but my phone then started ringing!

    Dialing <telno 23645>
    on /dev/ucom0 at 9600 baud (10:24:25)

    Trying ecu dialer
    /usr/local/lib/ecu/ucom0.mi: No such file or directory
    modem init string not found (using default 'ATE1Q0V1')
    modem dial string not found (using default 'ATDT')
    ATE1Q0V1
    missed expected carriage return
    got nothing
    ATE1Q0V1
    missed expected carriage return
    got nothing
    ATE1Q0V1
    missed expected carriage return
    got nothing
    ATE1Q0V1
    missed expected carriage return
    got nothing
    /usr/local/lib/ecu/ucom0.mi: No such file or directory
    modem init string not found (using default 'ATE1Q0V1')
    modem dial string not found (using default 'ATDT')
    ATE1Q0V1
    missed expected carriage return
    got nothing
    ATE1Q0V1
    missed expected carriage return
    got nothing
    ATE1Q0V1
    missed expected carriage return
    got nothing
    ATE1Q0V1
    missed expected carriage return
    got nothing
    ATDT23645
    missed expected carriage return
    Cannot talk to modem

    When it was over, I did a tip on the same device and it spewed a bunch of
    garbage at me:

    OK
    AT
    OK
    ATQ0V1E1
    OK
    ATE1Q0V1
    OK
    AT
    OK
    ATQ0V1E1
    OK
    ATE1Q0V1
    OK
    AT
    OK
    ATQ0V1E1
    OK
    ATE1Q0V1
    OK
    ATE1Q0V1
    OK
    AT
    OK
    ATQ0V1E1
    OK
    ATE1Q0V1
    OK
    AT
    OK
    ATQ0V1E1
    OK
    ATE1Q0V1
    OK
    AT
    OK
    ATQ0V1E1
    OK
    ATE1Q0

    So all the commands were going through, but somehow being buffered...?
    Any knobs I can play with to help with this situation?

    Thanks,

    Mike
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  • Next message: Matt Freitag: "Re: Loosing STDOUT after file rotation"