Some programs playing with printf log, in which init.rc, these log can not be displayed because the log is output to / dev / null. This problem can be solved by logwrapper, as follows:
service adbd /system/bin/logwrapper /sbin/adbd
disabled
Is to logwrapper added to the front of the server program.
Further, logwrapper the buffer is a circular buffer, so if the dump log slow, then the latter overwrite the previous log log.