[RFC] add --pidfile switch to write libo pid to a file

[Riccardo Magliocchetti]

Hello,

attached a patch to add a switch to have libreoffice store its pid in a 
file. I need that so that when libo runs in headless mode i can have a 
supervisor process checking if libo is running and in case just restart 
it. The error handling is a bit lame, do we have an helper to create a 
file with its content with one function call somewhere? that could help 
cleaning the pidfile creation code a bit i think.

I have a couple of issues though:
- i can't find where i should put the switch to show in the help output.
- have i placed the actual pid writing in the right place?

Stephan, i've copied the GETPID bits from sal/osl/all/log.cxx, is it ok 
for you to move them to sal/osl/process.h and include that file in log.cxx?

thanks,
riccardo
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