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agents written for certain JVMs have limited buffer for agent options #8

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
Chord passes several options to chord_instr_agent, many of which are not 
for consumption by the agent itself but are passed on to the other JVM 
processing events in the case of a dynamic analysis.  Some of these options 
take file names as values (e.g. instr_scheme_file_name) which can get very 
long since they are absolute paths in the file system.  Unfortunately some 
JVMs, like some versions of IBM J9, have a limited buffer size for options, 
in which case the "options" string passed to a JVM agent via the below 
function is silently truncated:

JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void 
*reserved)

Use a workaround such as a file to communicate options between the event-
generating and event-processing JVM, instead of via JVM agent options.

Original issue reported on code.google.com by mayur.naik on 27 Mar 2010 at 4:52