Re: [hpoj-devel] tonight's code changes

[Allen B. <ba...@lo...>]

[Back from a great trip to Bryce and Zion National Parks. Highly
reccommended! But wear a hat and use lots of sunscreen.]

David Paschal wrote:
> 1. ptal-mlcd and ptal-printd should now work properly from a hotplug script,
> despite the lack of stdin/stdout/stderr file descriptors.

Works.

> 2. ptal-mlcd and ptal-printd now log to syslog in addition to standard output
> or standard error, respectively.

Seems to work. When the commands start and run OK, there doesn't seem to
be any output! A test with bad command line arguments did put a line in
/var/log/messages. Maybe each of the ptal- commands could put a "banner"
line out to syslog on startup?

> 3. ptal-printd should be more immune to ptal-mlcd hiccups (such as device
> unplugs); previously it could exit due to a "broken pipe" signal.
> 
> 4. ptal-mlcd will now refuse to start if another instance of ptal-mlcd is
> already running using the same PTAL device name (socket).

Rapidly pulled and inserted the USB plug 3 times and got these messages
in /var/log/messages:

Jun 11 11:06:21 guanaco kernel: usb.c: USB disconnect on device 5
Jun 11 11:06:22 guanaco ptal-mlcd:  ptal-mlcd: ERROR at ExMgr.cpp:2182,
dev=<usb:0>, pid=3879, errno=19
Jun 11 11:06:22 guanaco ptal-mlcd: llioService: llioRead returns -1,
expected=6! 
Jun 11 11:06:22 guanaco ptal-mlcd:  ptal-mlcd: ERROR at ExMgr.cpp:888,
dev=<usb:0>, pid=3879, errno=25
Jun 11 11:06:22 guanaco ptal-mlcd: exClose(reason=0x0010)
Jun 11 11:06:23 guanaco kernel: hub.c: USB new device connect on bus1/1,
assigned device number 6
Jun 11 11:06:23 guanaco ptal-mlcd:  ptal-mlcd: ERROR at ExMgr.cpp:2095,
dev=<usb:0>, pid=3879, errno=19
Jun 11 11:06:23 guanaco ptal-mlcd: llioOpen: open failed!
Jun 11 11:06:23 guanaco ptal-mlcd:  ptal-mlcd: FATAL ERROR at
ExMgr.cpp:793, dev=<usb:0>, pid=3879, errno=19
Jun 11 11:06:23 guanaco ptal-mlcd: exActivate: Exiting due to activation
failure.
Jun 11 11:06:23 guanaco kernel: printer.c: usblp0: USB Bidirectional
printer dev 6 if 0 alt 0
Jun 11 11:06:24 guanaco kernel: usb.c: USB disconnect on device 6
Jun 11 11:06:24 guanaco ptal-mlcd:  ptal-mlcd: ERROR at ExMgr.cpp:2095,
dev=<usb:0>, pid=4902, errno=19
Jun 11 11:06:24 guanaco ptal-mlcd: llioOpen: open failed!
Jun 11 11:06:24 guanaco ptal-mlcd:  ptal-mlcd: FATAL ERROR at
ExMgr.cpp:793, dev=<usb:0>, pid=4902, errno=25
Jun 11 11:06:24 guanaco ptal-mlcd: exActivate: Exiting due to activation
failure.
Jun 11 11:06:24 guanaco kernel: hub.c: USB new device connect on bus1/1,
assigned device number 7
Jun 11 11:06:24 guanaco kernel: printer.c: usblp0: USB Bidirectional
printer dev 7 if 0 alt 0
Jun 11 11:06:25 guanaco kernel: usb.c: USB disconnect on device 7
Jun 11 11:06:26 guanaco ptal-mlcd:  ptal-mlcd: ERROR at ExMgr.cpp:2095,
dev=<usb:0>, pid=4941, errno=19
Jun 11 11:06:26 guanaco ptal-mlcd: llioOpen: open failed!
Jun 11 11:06:26 guanaco ptal-mlcd:  ptal-mlcd: FATAL ERROR at
ExMgr.cpp:793, dev=<usb:0>, pid=4941, errno=25
Jun 11 11:06:26 guanaco ptal-mlcd: exActivate: Exiting due to activation
failure.
Jun 11 11:06:26 guanaco kernel: hub.c: USB new device connect on bus1/1,
assigned device number 8
Jun 11 11:06:27 guanaco kernel: printer.c: usblp0: USB Bidirectional
printer dev 8 if 0 alt 0

Is this correct? There was only one instance of ptal-mlcd running after
all of that (but there were 4 ptal-printd's, also started by the hotplug
script). 

Allen