log: Fix restoring global log prefix It was allocated from data stack, which was freed by master_service_init_finish(). This may have caused wrong prefix to be used for log's internal error messages, or restoring the global log prefix could have crashed: Panic: file strfuncs.c: line 147 (t_noalloc_strdup_vprintf): assertion failed: ((unsigned int)ret == *size_r-1)

log: Include PID in prefix for internal log messages.

log: If too much logging data is sent, show it in process title.

Make sure we check all the functions' return values. Minor API changes to simplify this. Checked using a patched clang that adds attribute(warn_unused_result) to all functions. This commit fixes several error handling mistakes.

log: Keep track of last 1000 errors/warnings. "doveadm log errors" shows them.

Fixed log process after recent lib-master changes. --HG-- branch : HEAD

log, lib-master: More fifo handling fixes. --HG-- branch : HEAD

master: Fixes to handling logging. Master now has a non-blocking write pipe to log process, so it no longer blocks if log process is hanging. Also it's cleaner to send log commands via a pipe specifically meant for them. --HG-- branch : HEAD

Initial commit for v2.0 master rewrite. Several features are still missing. --HG-- branch : HEAD