Substantially based on a patch by Matthias Clasen <mclasen@redhat.com>
kqueue implementation by Joe Marcus Clarke <marcus@freebsd.org>
Previously, when we detected a configuration change (which included
the set of config directories to monitor for changes), we would
simply drop all watches, then readd them.
The problem with this is that it introduced a race condition where
we might not be watching one of the config directories for changes.
Rather than dropping and readding, change the OS-dependent monitoring
API to simply take a new set of directories to monitor. Implicit
in this is that the OS-specific layer needs to keep track of the
previously monitored set.
bus/dir-watch-kqueue.c (bus_watch_directory): Pass in a BusContext
instead of a void *. kqueue uses this to get the context's loop
while the other modules ignore the parameter. This allows us to
avoid platform conditionals
* bus/bus.c (process_config_postinit): Pass in the context to the
watch
* bus/bus.c (process_config_every_time): Drop existing conf-dir
watches (if applicable) and add new watches
* bus/main.c (signal_handler): Handle SIGIO if using D_NOTIFY
(main): Setup SIGIO signal handler if using D_NOTIFY
* bus/config-parser.h: Add prototype bus_config_parser_get_conf_dirs
* bus/config-parser.c (struct BusConfigParser): Add conf_dirs list
(merge_included): Also merge conf_dirs list
(bus_config_parser_unref): Clear conf_dirs list
(include_dir): Add directory to conf_dirs list
(bus_config_parser_get_conf_dirs): New function
* bus/dir-watch.[ch]: New files
* bus/Makefile.am (BUS_SOURCES): Add dir-watch.[ch]
* configure.in: Add checks for D_NOTIFY on Linux
