[Mimedefang] MD unable to create spool directories
Clayton, Nik [IT]
nik.clayton at citigroup.com
Tue Feb 25 08:11:01 EST 2003
> Caveat -- still using 2.16, until I find the time to package
> and test a more recent version. So this issue may have gone away by
> now, although by reading the code and the changelogs I don't see how.
It hasn't. I've just deployed 2.30, and we're still seeing the problem.
However, the fixes for some of the logging info in 2.30 have, I think,
pinpointed the problem.
We now see warnings in the logs that look like this:
fdopen failed on /var/spool/MIMEDefang/mdefang-3E5B606F-0/INPUTMSG:
Error 0
This also happens on the COMMANDS and HEADERS files, and sometimes the
error string is 'File exists' instead of 'Error 0'.
Checking the fdopen(3C) man page
http://www.freebsd.org/cgi/man.cgi?query=fdopen&apropos=0&sektion=0&manpath=
SunOS+5.8&format=html
it says:
[...]
RETURN VALUES
Upon successful completion, fdopen() returns a pointer to
a stream. Otherwise, a null pointer is returned and errno
is set to indicate the error.
The fdopen() function may fail and not set errno if there
are no free stdio streams.
[...]
USAGE
The number of streams that a process can have open at one
time is STREAM_MAX. If defined, it has the same value as
FOPEN_MAX.
A grovel through /usr/include/stdio.h shows
#define _NFILE 20
#define FOPEN_MAX _NFILE
and no definition for STREAM_MAX.
This is documented as a per-process limit, rather than a per-thread limit,
so this would seem to put a severe cap on the number of messages that
mimedefang can process concurrently.
N
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