Re: [gpsd-dev] Snap 3.15 shipped as promised; things to do next

[Brian T (gmail)]

On 6/3/2015 9:23 AM, Eric S. Raymond wrote:
> Brian T., would you be able to work with me on developing a script to
> reproduce this problem?  If we runit at a high enough debug level I
> think something will shake loose.

Here is a trace with gpsd v3.14, without the patch, debug level 5, gpsd 
watching ttyS4 and ttyUSB1, then I cut the power to the device providing 
ttyUSB1, and this is what I get in the syslog

Jun  5 17:53:19 gpsd[3382]: gpsd:CLIENT: => client(0): 
$GPRMC,225320.000,A,3838.7079,N,08957.7429,W,0.1,0.0,050615,0.0,W*68\x0d\x0a
Jun  5 17:53:19 gpsd[3382]: gpsd:PROG: Changed mask: 
{ONLINE|TIME|LATLON|SPEED|TRACK|MODE|PACKET|CLEAR|PPSTIME} with reliable cycle 
detection
Jun  5 17:53:19 gpsd[3382]: gpsd:IO: <= GPS: 
$GPGGA,225320.000,3838.7079,N,08957.7429,W,1,04,4.8,193.18,M,-33.6,M,,*59^M
Jun  5 17:53:19 gpsd[3382]: gpsd:PROG: GPGGA sentence timestamped 225320.00.
Jun  5 17:53:19 gpsd[3382]: gpsd:PROG: GPGGA ends a reporting cycle.
Jun  5 17:53:19 gpsd[3382]: gpsd:CLIENT: => client(0): 
$GPGGA,225320.000,3838.7079,N,08957.7429,W,1,04,4.8,193.18,M,-33.6,M,,*59\x0d\x0a
Jun  5 17:53:19 gpsd[3382]: gpsd:PROG: Changed mask: 
{ONLINE|TIME|LATLON|ALTITUDE|STATUS|MODE|PACKET|REPORT|PPSTIME} with reliable 
cycle detection
Jun  5 17:53:19 gpsd[3382]: gpsd:PROG: time to report a fix
Jun  5 17:53:19 gpsd[3382]: gpsd:CLIENT: => client(0): 
{"class":"TPV","device":"/dev/ttyS4","mode":3,"time":"2015-06-05T22:53:20.000Z","ept":0.005,"lat":38.645131667,"lon":-89.962381667,"alt":193.180,"epv":112.700,"track":0.0000,"speed":0.051}\x0d\x0a
Jun  5 17:53:19 gpsd[3382]: gpsd:INFO: closing GPS=/dev/ttyUSB1 (10)
Jun  5 17:53:19 gpsd[3382]: gpsd:PROG: no /etc/gpsd/device-hook present, 
skipped running DEACTIVATE hook
Jun  5 17:53:19 gpsd[3382]: gpsd:INFO: reconnection attempt on device 1
Jun  5 17:53:19 gpsd[3382]: gpsd:PROG: no /etc/gpsd/device-hook present, 
skipped running ACTIVATE hook
Jun  5 17:53:19 gpsd[3382]: gpsd:INFO: opening read-only GPS data source type 0 
and at '/dev/ttyUSB1'
Jun  5 17:53:19 gpsd[3382]: gpsd:ERROR: device open of /dev/ttyUSB1 failed: No 
such file or directory - retrying read-only
Jun  5 17:53:19 gpsd[3382]: gpsd:ERROR: read-only device open of /dev/ttyUSB1 
failed: No such file or directory
Jun  5 17:53:19 gpsd[3382]: gpsd:ERROR: /dev/ttyUSB1: device activation failed.

I know from previous debugging, that at this point gpsd_await_data() on line 2180 in 
gpsd.c returns AWAIT_FAILED, and gpsd exits with   "exit(EXIT_FAILURE)"

Not sure if you need more, but I can provide just about anything you request.

Thanks!

-Brian T.