This patch implements the protocol Tom suggested for writing to the syslogger pipe. It seems to pass my tests (basically "make installcheck" against a server with stderr redirection turned on and log_statement set to 'all').

The effect of this should be to prevent two problems:
. partial messages get written to the log file, which messes with rotation, and
. messages from various backends get interleaved, causing garbled logs.

Please review ASAP. I want to get this applied soon so that a) it gets wider testing and b) I can use it as the basis for the adapted CSV log patch. If this is acceptable I intend to backpatch this all the way to wherever we started using the syslogger pipe (was that 8.0?).



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