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When outputing to a file or screen won't work, I usually write "records"
to a large (say, 64K) buffer, appending as I go.  Then after the program
has hit a breakpoint which I have theorized might be interesting, I
examine the buffer's contents using the debugger's dump command.   It is
easy to make the buffer wrap-around, if 64K isn't big enough, especially
if the records you write to the buffer are fixed length, and, better yet,
have a length which is a power of two (say 16, 32, ....).The advantages of
this technique (writing to the buffer) are that it is fast, involves no OS
calls, and if your environment is non-preemptive (not many of those
anymore) happens in "no time" at all, since no other process can execute
during the write to the buffer.

Michael Hanlon  mhanlon.novell@novell.com

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