FYI, nagios command file pipe may cause passive service corruption

[Stanley Hopcroft]

Dear Sir,

You may be mistaken in the matter of interleaving with _high volumes_ of
messages input to the Nagios command file.

Most of the texts (eg W R Stevens APUE p 446) state that provided each
process writes no more than PIPE_BUF per write, there will be no
interleaving, regardless of the input rate.

Writes to a named pipe will be atomic if each write is less than
PIPE_BUF (perl -MPOSIX=_POSIX_PIPE_BUF -e 'print _POSIX_PIPE_BUF, "\n"'
on this FreeBSD system it is 512 bytes).

Yours sincerely.

-- 
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.


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