[erlang-questions] Re: Chain two spawned processes

[Max Lapshin]

This is first patch, required to catch stderr of spawned process
(tools like x264 print their status to stderr).

bif open_port/2 gets new flag: error  (maybe bad name?). If you pass
it, process will receive messages {error, ErrorData}

Patch made for R13B02-1, not appliable for QNX because I even cannot
imagine, how to test it.
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