Udevng plugin seems to fail sometimes?

[John Ernberg <john.ernberg@actia.se>]

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Hi,

I am using oFono in an embedded environment, and I seem to have 
encountered a problem with the udevng plugin. It seems that the 
udev_monitor sometimes fails to init, so when the modem in the 
environment has started, oFono cannot find it. I can see the modem with 
'lsusb' if I log in to the embedded system, but when I list the modems 
in oFono I get an empty list.

I have verified that when this happens udev is running in the system, 
and that a sane file descriptor is received when creating the IOChannel 
used for the monitor. Yet, the channel is closed almost immediately. My 
best guess is that udev sends some sort of HUP.

oFono is started automatically by systemd, but in a much later target 
than udev.

The issue appears too sporadically to be able to debug this properly, so 
I am wondering if anyone else has seen this issue?

While trying to understand myself exactly what is going on I haven't 
managed to come across anything on google, or in other programs' source 
code, suggesting that the setup code for the monitor is doing something 
wrong. So, I also wonder if anyone has any suggestions on what kind of 
traces I shall try to print to gain an understanding of what is happening?

Thank you in advance for any assistance.

Best regards // John Ernberg