1*49cdfc7eSAndroid Build Coastguard Worker.. SPDX-License-Identifier: GPL-2.0-or-later 2*49cdfc7eSAndroid Build Coastguard Worker 3*49cdfc7eSAndroid Build Coastguard WorkerDebugging 4*49cdfc7eSAndroid Build Coastguard Worker========= 5*49cdfc7eSAndroid Build Coastguard Worker 6*49cdfc7eSAndroid Build Coastguard WorkerThis section explains some tricks which can be used to debug test binaries. 7*49cdfc7eSAndroid Build Coastguard Worker 8*49cdfc7eSAndroid Build Coastguard WorkerDebug messages 9*49cdfc7eSAndroid Build Coastguard Worker-------------- 10*49cdfc7eSAndroid Build Coastguard Worker 11*49cdfc7eSAndroid Build Coastguard WorkerThe LTP framework supports ``TDEBUG`` flag test debug messages. These 12*49cdfc7eSAndroid Build Coastguard Workermessages can be enabled using the ``-D`` parameter or setting ``LTP_ENABLE_DEBUG=1`` 13*49cdfc7eSAndroid Build Coastguard Workerenvironment variable (see :doc:`../users/setup_tests`). 14*49cdfc7eSAndroid Build Coastguard Worker 15*49cdfc7eSAndroid Build Coastguard WorkerTracing and debugging syscalls 16*49cdfc7eSAndroid Build Coastguard Worker------------------------------ 17*49cdfc7eSAndroid Build Coastguard Worker 18*49cdfc7eSAndroid Build Coastguard WorkerThe new test library runs the actual test (i.e. the ``test()`` function) in a 19*49cdfc7eSAndroid Build Coastguard Workerforked process. To get stack trace of a crashing test in ``gdb`` it's needed to 20*49cdfc7eSAndroid Build Coastguard Worker`set follow-fork-mode child <https://sourceware.org/gdb/current/onlinedocs/gdb.html/Forks.html>`_. 21*49cdfc7eSAndroid Build Coastguard Worker 22*49cdfc7eSAndroid Build Coastguard WorkerTo trace the test, please use ``strace -f`` to enable tracing also for the 23*49cdfc7eSAndroid Build Coastguard Workerforked processes. 24