connect/disconnect problem with Synce0.9

From: Dennis C (dchou4u_at_hotmail.com)
Date: 10/29/04

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    Date: 29 Oct 2004 10:31:20 -0700

    I am running Fedora Core 2 with a linux version 2.6.5 on my PC box. I
    installed the latest synce 0.9 rpm's from sourceforge. I also
    successfully applied all the patches as spelled out in the various
    notes in this forum.
     
    I successfully connected via USB to a HP iPAQ 5150 using:
    synce-serial-config ttyUSB=1 /* superuser mode */
    dccm /* user mode */
    synce-serial-start /* superuser mode */
     
    I was able to use the tools (pls, pcp, etc) to access files and
    directories on the PDA. :)
     
    After I disconnected the USB cable, I did a:
    synce-serial-abort /* superuser mode */
     
    Then I reconnected the USB cable and tried to do a:
    synce-serial-start /* superuser mode */
    But it does not work anymore.
     
    Has anyone successfully managed to keep synce working even as the USB
    cable is repeatedly connected and disconnected? I have a need to get
    synce working in such an environment.
     
    Thanks
    Dennis
     
    FYI: I do not have hotplug enabled. Below is the dump from
    /var/log/messages with my annotations to explain what I did.
     
    Oct 26 14:16:17 dennis dccm[2788]: Listening for connections on port
    5679 /* I started dccm */
    Oct 26 14:16:26 dennis kernel: usb 3-2: new full speed USB device
    using address 2 /* I connected the USB cable */
    Oct 26 14:16:26 dennis kernel: usbserial 3-2:1.0: PocketPC PDA
    converter detected
    Oct 26 14:16:26 dennis kernel: usb 3-2: PocketPC PDA converter now
    attached to ttyUSB0 (or usb/tts/0 for devfs)
    Oct 26 14:16:26 dennis kernel: usb 3-2: PocketPC PDA converter now
    attached to ttyUSB1 (or usb/tts/1 for devfs)
    Oct 26 14:16:53 dennis kernel: CSLIP: code copyright 1989 Regents of
    the University of California
    Oct 26 14:16:53 dennis kernel: PPP generic driver version 2.4.2
    Oct 26 14:16:53 dennis kernel: ip_tables: (C) 2000-2002 Netfilter core
    team
    Oct 26 14:16:53 dennis synce-serial-start: Executing '/usr/sbin/pppd
    call synce-device'
    Oct 26 14:16:53 dennis pppd[2883]: pppd 2.4.2 started by root, uid 0
    Oct 26 14:16:54 dennis pppd[2883]: Serial connection established.
    Oct 26 14:16:54 dennis pppd[2883]: Using interface ppp0
    Oct 26 14:16:54 dennis pppd[2883]: Connect: ppp0 <--> /dev/ttyUSB1
    Oct 26 14:16:55 dennis kernel: PPP Deflate Compression module
    registered
    Oct 26 14:16:55 dennis pppd[2883]: local IP address 192.168.131.102
    Oct 26 14:16:55 dennis pppd[2883]: remote IP address 192.168.131.201
    Oct 26 14:16:56 dennis dccm[2788]: Connection from 192.168.131.201
    accepted
    Oct 26 14:16:56 dennis dccm[2788]: Talking to 'Pocket_PC', a PocketPC
    device of type hp iPAQ h5000
     
    /* I disconnect the USB cable here */
    Oct 26 14:25:20 dennis kernel: usb 3-2: USB disconnect, address 2
    Oct 26 14:25:20 dennis kernel: usbserial 3-2:1.0: device disconnected
    Oct 26 14:25:21 dennis kernel: /home/choud/synce/ipaq/ipaq.c:
    ipaq_write_bulk - failed submitting write urb, error -19
    Oct 26 14:25:31 dennis dccm[2788]: Connection from 192.168.131.201
    closed
     
    /* I did a synce-serial-abort here */
    Oct 26 14:25:53 dennis synce-serial-abort: Killing process with PID
    2883
    Oct 26 14:25:53 dennis pppd[2883]: Terminating on signal 15.
    Oct 26 14:25:59 dennis pppd[2883]: Connection terminated.
    Oct 26 14:25:59 dennis pppd[2883]: Connect time 9.0 minutes.
    Oct 26 14:25:59 dennis pppd[2883]: Sent 16360 bytes, received 13421
    bytes.
     
    /* Looks like pid 2883 didnt die, so.. */
    /* I did another synce-serial-abort here */
    Oct 26 14:39:48 dennis synce-serial-abort: Killing process with PID
    2883
    Oct 26 14:39:48 dennis pppd[2883]: Terminating on signal 15.
    Oct 26 14:39:48 dennis pppd[2883]: ioctl(TIOCSETD, N_TTY): Interrupted
    system call (line 573)
    Oct 26 14:39:48 dennis pppd[2883]: tcsetattr: Invalid argument (line
    1000)
    Oct 26 14:39:48 dennis kernel: PocketPC PDA ttyUSB0: PocketPC PDA
    converter now disconnected from ttyUSB0
    Oct 26 14:39:48 dennis kernel: PocketPC PDA ttyUSB1: PocketPC PDA
    converter now disconnected from ttyUSB1
    Oct 26 14:39:48 dennis pppd[2883]: Hangup (SIGHUP)
    Oct 26 14:39:48 dennis pppd[2883]: Connect time 9.0 minutes.
    Oct 26 14:39:48 dennis pppd[2883]: Sent 16360 bytes, received 13421
    bytes.
    Oct 26 14:39:48 dennis pppd[2883]: Exit.
     
    /* Looks like pid 2883 died on the 2nd kill. */
    /* So I did a synce-serial-start here */
    Oct 26 14:41:23 dennis synce-serial-start: Executing '/usr/sbin/pppd
    call synce-device'
    Oct 26 14:41:23 dennis pppd[3158]: pppd 2.4.2 started by root, uid 0
    Oct 26 14:41:23 dennis pppd[3158]: Failed to open /dev/ttyUSB1: No
    such device
    Oct 26 14:41:23 dennis pppd[3158]: Exit.
     
    /* It somehow cannot open /dev/ttyUSB1 anymore. :( */

    I am tracing the logs and it appears that when I unplug the USB cable,
    the read_bulk_callback or the write_bulk routines will return an error
    code of either -2, -84 or -19. Given that it returns an error, should
    it then do a serial_close so that we can invoke the tty_hangup? It
    appears that it does not do a serial_close but continues to do more
    reads and/or writes.
     
    Can anyone tell me who calls the serial_xxx() routines? Any pointers
    will be appreaiated.

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