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+Some extra options to DBUG_PUSH:
+
+O,logfile - As "o,logfile", but do a close and reopen each time anything
+ is written to the logfile. This is neaded when one expects
+ the program to crash anywhere, in which case one dosen't
+ (at least in MSDOS) get a full log-file.
+
+If one wants a logfile with a ': in the filename, one can get it by
+giving a double ':'. (As in "O,c::\tmp\log")
+
+DBUG_DUMP("keyword",memory-position,length) writes a hexdump of the
+given memory-area to the outputfile.