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Signal handler cleanup.
* mainloop.c (fatal_handler): New. Cleanly handle
unexpected fatal signals.
(setup_main_signals): New. Set signals once mainloop
is entered.
(setup_signals): New. Block certain signals during initialization.
Set handler for fatal signals.
* relay.c (reader_thread): Use ppoll(). Terminate on
SIGUSR2 after reading any remaining data.
(close_relayfs): Remove sleep hack. Send SIGUSR2 to all threads.
Runtime debug messages.
* staprun.h: Change dbug() to accept a debuglevel and
enable it.
* *.c: Modify dbug() calls.
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* mainloop.c (run_stp_check): Just use system() call.
(init_staprun): Remove _stp_pid module parameter.
(cleanup_and_exit): If closed==2, just exit without removing module.
(driver_poll): Remove. We no longer require stap running.
(_stp_main_loop): Remove call to driver_poll.
* ctl.c (init_ctl_channel): Don't put files in systemtap_pid,
revert back to systemtap/modulename.
* relay.c: Revert back to systemtap/modulename paths.
* relay_old.c: Ditto.
* staprun.c: Add -L and -A args.
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* staprun.c: Renamed from stpd.c. Removed quiet and print_only
options. Added "-x" option as an alias for "-t". Removed "-m"
option. Updated arg processing to leave 4 slots for modoptions[].
Bump the priority of staprun.
* ctl.c: New. Transport control channel functions.
* relay.c: New. Relayfs control functions for new transport.
* relay_old.c: New. Relayfs control functions for older
versions of relayfs.
* mainloop.c: New. Staprun main loop.
* staprun.h: Renamed from librelay.h. Cleaned up.
* stap_merge.c: Renamed. Updated for modified save format.
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