Remove a superfluous check in fs_mgr, since those return values are
already impossible for a non-debuggable build. Replace a one time
call to __android_log_is_debuggable(), since there's no reason to
cache the value or use this symbol.
Test: build
Change-Id: Icd4bef7b616c49d304303747388d7e3018c6fcfc
When Android is running in a container, ftrace trace_marker may be
disabled, e.g. Chrome OS verified mode. To enable trace, a socket is
created for everyone to send trace event.
Modify libcutils so apps using it can write trace to the socket.
To achieve this goal without touching code for normal device,
trace-container.c is created for code specific to container. Shared
code between trace-dev.c and trace-container.c is moved to local
trace-dev.h.
Note that to avoid sharing FDs across different processes, Zygote closes
FD and reopen it to /dev/null if it is a socket. Therefore, we need to
manually close FD and reopen it again after forking. This is done in
the atrace_set_tracing_enabled as Zygote also use it to clear flags
during forking.
Related change:
- http://crrev.com/2400163003 (Chromium)
- http://ag/2028075 (Android system/core)
- http://ag/1738271 (Android device/google/cheets2)
Bug: 29776474, 62410809
Test: run chrome://tracing and see data from the host side.
Change-Id: I3fe969e284b972c28e4f32f23cd948aaea61a043
