[pgpool-hackers: 3490] [Proposal] Check if socket file exists at startup and remove them if PID file doesn't exist.

[Bo Peng]

If the previuos socket files exist, pgpool startup fails due to bind() failire.

Attached file is a patch to remove socket files at startup 
if PID file doesn't exist.

-- 
Bo Peng <pengbo at sraoss.co.jp>
SRA OSS, Inc. Japan
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