tree 9ecad241d08a8877f5bab0ac72dd6b399fb730a8
parent 1327096789b0c7b0e16ca28bc61ad403cd2aa590
author Matt Spinler <spinler@us.ibm.com> 1633378257 -0500
committer Matt Spinler <spinler@us.ibm.com> 1633962059 +0000

control: Dump flight recorder on signal SIGUSR1

Add a SIGUSR1 handler to dump the flight recorder.

It uses the sdventplus sd_event_add_defer wrapper to do the dump when
the code gets back to the event loop so it doesn't spend the time doing
it inside the signal handler itself.

The flight recorder can now be dumped with:
    kill -USR1 $(pidof phosphor-fan-control)
    or
    systemctl kill -s USR1 phosphor-fan-control@0

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I46e45cb7a5e42ea4d217f63a8e14b6ef02ed8c22