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In async write mode, we use modular arithmetic to index the output
buffer array. However, the counter variables accidently were signed,
thus resulting in negative indizes after integer overflow. That in turn
could lead to segfaults, but was depending on the memory layout of
the instance in question (which in turn depended on a number of
variables, like compile settings but also configuration). The counters
are now unsigned (as they always should have been) and so the dangling
mis-indexing does no longer happen. This bug potentially affected all
installations, even if only some may actually have seen a segfault.
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Conflicts:
runtime/debug.h
runtime/stream.c
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for the stream class and thus finally activating omfile's timeout
capability in a useful way without polling and too-high performance
overhead.
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... seems to work on quick testing, but needs a far more testing
and improvement. Good milestone commit.
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Conflicts:
runtime/rsyslog.h
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Note that this was NOT a trivial merge, and there may be
some issues. This needs to be seen when we continue developing.
Conflicts:
runtime/msg.h
runtime/obj.h
runtime/queue.c
runtime/srUtils.h
runtime/stream.c
runtime/stream.h
runtime/wti.c
tests/Makefile.am
tools/omfile.c
tools/syslogd.c
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This is the first shot at this functionality. Currently, we run off a fixed
counter in the rsyslogd mainloop, which needs to be restructured. But this
code works, so it is a good time for a commit.
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... by moving code to stream.c. Thanks to the new design, new cases are
not really needed, resulting in cleaner code.
I also did a cleanup of header file usage as a side-activity.
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... restoring missing functionality after the restructuring of imfile. As
a side-effect, this also lays the foundation for even more reliable queue
engine operations (but this is not yet done).
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now cleand up omfile and straighted out some things. The only commented-out
code left is code that must be moved/merged to the stream class, my next target.
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now some basic operations are carried out via the stream class.
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... and also made it callable via an rsyslog interface rather then
relying on the OS loader (important if we go for using it inside
loadbale modules, which we soon possible will)
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... and also improved the test suite. There is a design issue in the
v3 queue engine that manifested to some serious problems with the new
processing mode. However, in v3 shutdown may take eternally if a queue
runs in DA mode, is configured to preserve data AND the action fails and
retries immediately. There is no cure available for v3, it would
require doing much of the work we have done on the new engine. The window
of exposure, as one might guess from the description, is very small. That
is probably the reason why we have not seen it in practice.
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