In all the cases, I have found any file which is open for reading or writing is displayed in lsof output. But today, I am trying to found a logfile that is opened for writing by a java process in lsof output. But I can't find it in the output. But the logfile is active and is being updated.Does files opened by java or python etc. won't show in lsof output?FYI,# lsof /usr/local/qftest/log/qftest.log# lsof -p 30732 -a +d /usr/local/qftest/log# lsof -p 30732 -a +D /usr/local/qftest/log# lsof | grep qftest.log# ps -p 30732 -f  qftest 30732 1 99 Sep09 ? 6-07:37:34 java -Xbootclasspath/p:/usr/local/qftest/qftest-3.5.7/lib/endorsed/xalan.jar:/usr/local/qftest/qftest-3.5.7/lib/endorsed/xerces.jar:/usr/local/qftest/qftest-3.5.7/lib/endorsed/xml-apis.jar:/usr/local/qftest/qftest-3.5.7/lib/endorsed/serializer.jar -Dqftest.home=/usr/local/qftest -Dqftest.versionhome=/usr/local/qftest/qftest-3.5.7 -Dqftest.display= -Xmx256m -Xms16m -classpath /usr/local/qftest/qftest-3.5.7/qflib/qftest.jar:/usr/local/qftest/qftest-3.5.7/qflib/qfshared.jar:/usr/local/qftest/qftest-3.5.7/qflib/qfdemo.jar:/usr/local/qftest/qftest-3.5.7/qflib/qflog.jar:/usr/local/qftest/qftest-3.5.7/qflib/qflib.jar:/usr/local/qftest/qftest-3.5.7/lib/endorsed/serializer.jar:/usr/local/qftest/qftest-3.5.7/lib/endorsed/xml-apis.jar:/usr/local/qftest/qftest-3.5.7/lib/endorsed/xerces.jar:/usr/local/qftest/qftest-3.5.7/lib/endorsed/xalan.jar:/usr/local/qftest/qftest-3.5.7/lib/truezip.jar:/usr/local/qftest/qftest-3.5.7/lib/poi.jar:/usr/local/qftest/qftest-3.5.7/lib/netty.jar:/usr/local/qftest/qftest-3.5.7/lib/looks.jar:/usr/local/qftest/qftest-3.5.7/lib/jxl.jar:/usr/local/qftest/qftest-3.5.7/lib/junit.jar:/usr/local/qftest/qftest-3.5.7/lib/jide-oss.jar:/usr/local/qftest/qftest-3.5.7/lib/jfreechart.jar:/usr/local/qftest/qftest-3.5.7/lib/jcommon.jar:/usr/local/qftest/qftest-3.5.7/lib/commons.jar:/usr/local/qftest/qftest-3.5.7/lib/pngencoder.jar:/usr/local/qftest/qftest-3.5.7/lib/png.jar:/usr/local/qftest/qftest-3.5.7/lib/jython.jar:/usr/local/qftest/qftest-3.5.7/lib/jniwrapper.jar:/usr/local/qftest/qftest-3.5.7/lib/jline.jar:/usr/local/qftest/qftest-3.5.7/lib/jansi.jar:/usr/local/qftest/qftest-3.5.7/lib/groovy-all.jar:/usr/local/qftest/qftest-3.5.7/lib/gnu.jar:/usr/local/qftest/qftest-3.5.7/lib/bsf.jar: de.qfs.apps.qftest.start.QFTestRunner -shellarg=-c -shell=/bin/sh -options=/usr/local/qftest/qftest-3.5.7/bin/qftest.options -logfile=/usr/local/qftest/log/qftest.log -licenseserverEDIT 1:After reading this lsof doesn't return files open by the same user, I thought there could be a swap file created, but there are no REG files in the lsof -p 30372 output with write mode.Also there are no other child processes created from this process.But the output shows many files like the below opened for writing:java    30732 qftest   40r     FIFO        0,6          490757310 pipejava    30732 qftest   41w     FIFO        0,6          490757310 pipejava    30732 qftest   42r     0000       0,11        0 490757311 eventpolljava    30732 qftest   43r     FIFO        0,6          490757312 pipejava    30732 qftest   44w     FIFO        0,6          490757312 pipejava    30732 qftest   45r     0000       0,11        0 490757313 eventpolljava    30732 qftest   46r     FIFO        0,6          490757314 pipejava    30732 qftest   47w     FIFO        0,6          490757314 pipejava    30732 qftest   48r     0000       0,11        0 490757315 eventpollI don't know what is eventpoll here, but I think it is reading the log from eventpoll and it seems the logfile is split into several (don't know what it is) and is writing. It's like multiple processes are reading events and writing to the same file in some way I really don't know.
Are all open files displayed in lsof output?
java;lsof;open files