[Merge] lp:~marcustomlinson/process-cpp/clear_sigmask_on_fork into lp:process-cpp

[Marcus Tomlinson]

Hey Thomas,

I ran into issues when fork and exec-ing gdbserver with process-cpp because gdbserver needs to monitor its own child signals (specifically SIGCHLD in this situation). If we don't clear the mask on fork, the child inherits them, which caused really weird behaviour with gdbserver.

Does this change seem sane to you?
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https://code.launchpad.net/~marcustomlinson/process-cpp/clear_sigmask_on_fork/+merge/230048
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