1 # wrapagentproperties 2 3 wrapagentproperties is a JVMTI agent that lets one change the returned values of 4 an agents GetSystemPropert{y,ies} calls. 5 6 # Usage 7 ### Build 8 > `make libwrapagentproperties` # or 'make libwrapagentpropertiesd' with debugging checks enabled 9 10 The libraries will be built for 32-bit, 64-bit, host and target. Below examples 11 assume you want to use the 64-bit version. 12 13 ### Command Line 14 #### ART 15 > `art -Xplugin:$ANDROID_HOST_OUT/lib64/libopenjdkjvmti.so -agentpath:$ANDROID_HOST_OUT/lib64/libwrapagentproperties.so=/path/to/prop.file,/path/to/agent=agent-args -cp tmp/java/helloworld.dex -Xint helloworld` 16 17 * `-Xplugin` and `-agentpath` need to be used, otherwise libtitrace agent will fail during init. 18 * If using `libartd.so`, make sure to use the debug version of jvmti. 19 20 ### prop file format. 21 22 The property file is a text file containing the values of java properties you 23 wish to override. The format is property=value on each line. Blank lines and 24 lines beginning with "#" are ignored. 25 26 #### Example prop file 27 28 # abc.prop 29 abc.def=123 30 def.hij=a big deal 31
