added plugs for OSX /dev/events - does not yet work.

Makefile.am

@@ -5,6 +5,9 @@ lsyncd_SOURCES = lsyncd.h lsyncd.c lsyncd.lua
 if INOTIFY
 lsyncd_SOURCES += inotify.c
 endif
+if FSEVENTS
+lsyncd_SOURCES += fsevents.c
+endif
 
 lsyncd_LDADD = $(LIBLUA_LIBS)
 exampledir = $(datarootdir)/doc/@PACKAGE@

configure.ac

@@ -29,7 +29,7 @@ AM_CONDITIONAL([RUNNER],  [test x${with_runner} != x])
 ###
 # --without-inotify option
 AC_ARG_WITH([inotify],
-[  --without-inotify      Do not compile Linux inotify event interface (on by default)])
+[  --without-inotify       Do not compile Linux inotify event interface. On by default.])
 if test "x${with_inotify}" == xno; then
 	echo "compiling without inotify"
 else
@@ -38,6 +38,22 @@ else
 fi
 AM_CONDITIONAL([INOTIFY], [test x${with_inotify} != xno])
 
+###
+# --with-fsevents 
+AC_ARG_WITH([fsevents],
+[  --with-fsevents=DIR     Uses MacOS (10.5) /dev/fsevents, experimental! Off by default.
+                          As DIR specify dir where xnu headers can be found.])
+if test "x${with_fsevents}" == xno; then
+	with_fsevents=
+fi
+if test "x${with_fsevents}" != x; then
+	echo "compiling with fsevents. Warning experimental!"
+	AC_DEFINE(LSYNCD_WITH_FSEVENTS,,"descr")
+else
+	echo "compiling without fsevents"
+fi
+AM_CONDITIONAL([FSEVENTS], [test x${with_fsevents} != x])
+
 # Checks for typedefs, structures, and compiler characteristics.
 # Checks for library functions.
 AC_CONFIG_FILES([Makefile])

fsevents.c

@@ -0,0 +1,49 @@
+/** 
+ * fsevents.c from Lsyncd - Live (Mirror) Syncing Demon
+ *
+ * License: GPLv2 (see COPYING) or any later version
+ *
+ * Authors: Axel Kittenberger <axkibe@gmail.com>
+ *
+ * -----------------------------------------------------------------------
+ *
+ * Event interface for MacOS 10(.5) /dev/fsevents interface.
+ *
+ * WARNING! AFAIK this interface is not strictly considered "public" API 
+ * by Apple. Thus it might easily change between versions. Also its said,
+ * altough every event receiver has its own message queue, the OS X kernel
+ * only deletes a message after *all* registered receivers handled it. So
+ * one receiver blocking overflows all receivers. So spotlight might have 
+ * to do more stuff, when Lsyncd might cause an overflow. Use at own risk. 
+ *
+ * Special thanks go to Amit Singh and his fslogger demonstration that
+ * showed how apples /dev/fsevents can be used.
+ * http://osxbook.com/software/fslogger/
+ */
+
+#include "lsyncd.h"
+
+/** 
+ * registers fsevents functions.
+ */
+extern void
+register_fsevents(lua_State *L) {
+	// TODO
+}
+
+/** 
+ * opens and initalizes fsevents.
+ */
+extern void
+open_fsevents(lua_State *L) {
+	// TODO
+}
+
+/** 
+ * closes fsevents
+ */
+extern void
+close_fsevents() {
+	// TODO
+}
+

lsyncd.c

@@ -40,16 +40,18 @@
  * The Lua part of lsyncd if compiled into the binary.
  */
 #ifndef LSYNCD_DEFAULT_RUNNER_FILE
-extern char _binary_luac_out_start;
+	extern char _binary_luac_out_start;
-extern char _binary_luac_out_end; 
+	extern char _binary_luac_out_end; 
 #endif
 
 
 /**
  * The default notification system to use.
  */
-#ifdef LSYNCD_WITH_INOTIFY
+#if   defined  LSYNCD_WITH_INOTIFY
-extern char *default_notify = "Inotify";
+	static char *default_notify = "Inotify";
+#elif defined LSYNCD_WITH_FSEVENTS
+	static char *default_notify = "FsEvents";
 #else
 #	error "need at least one notifcation system. please rerun ./configure"
 #endif
@@ -73,7 +75,7 @@ static bool is_daemon = false;
  * True after first configuration phase. This is to write configuration error
  * messages to stdout/stderr after being first started. Then it uses whatever
  * it has been configured to. This survives a reset by HUP signal or 
- * inotify OVERFLOW!
+ * inotify OVERFLOW.
  */
 static bool running = false;
 
@@ -1142,12 +1144,15 @@ masterloop(lua_State *L)
 		lua_pop(L, 2);
 
 		if (have_alarm && time_before_eq(alarm_time, now)) {
-			/* there is a delay that wants to be handled already thus do not 
+			/* there is a delay that wants to be handled already thus instead of  
-			 * read from inotify_fd and jump directly to its handling */
+			 * reading/writing from observances it jumps directly to handling */
+
+			// TODO: Actually it might be smarter to handler observances eitherway.
+			//       since event queues might overflow.
 			logstring("Masterloop", "immediately handling delays.");
 		} else {
 			/* use select() to determine what happens next
-			 * + a new event on inotify
+			 * + a new event on an observance
 			 * + an alarm on timeout  
 			 * + the return of a child process */
 			struct timespec tv;
@@ -1336,8 +1341,14 @@ main1(int argc, char *argv[])
 	lua_setglobal(L, "lysncd");
 	
 	lua_getglobal(L, "lysncd");
+#ifdef LSYNCD_WITH_INOTIFY
 	register_inotify(L);
 	lua_settable(L, -3);
+#endif
+#ifdef LSYNCD_WITH_FSEVENTS
+	register_fsevents(L);
+	lua_settable(L, -3);
+#endif
 	lua_pop(L, 1);
 
 	if (check_logcat("Debug") >= settings.log_level) {
@@ -1509,7 +1520,12 @@ main1(int argc, char *argv[])
 		}
 	}
 
+#ifdef LSYNCD_WITH_INOTIFY
 	open_inotify(L);
+#endif
+#ifdef LSYNCD_WITH_FSEVENTS
+	open_fsevents(L);
+#endif
 
 	{
 		/* adds signal handlers *
@@ -1529,7 +1545,8 @@ main1(int argc, char *argv[])
 		/* runs initialitions from runner 
 		 * lua code will set configuration and add watches */
 		load_runner_func(L, "initialize");
-		if (lua_pcall(L, 0, 0, -2)) {
+		lua_pushstring(L, default_notify);
+		if (lua_pcall(L, 1, 0, -3)) {
 			exit(-1); // ERRNO
 		}
 		lua_pop(L, 1);
@@ -1566,7 +1583,12 @@ main1(int argc, char *argv[])
 	settings.log_level = 0,
 	settings.nodaemon = false,
 
+#ifdef LSYNCD_WITH_INOTIFY
 	close_inotify();
+#endif
+#ifdef LSYNCD_WITH_FSEVENTS
+	close_fsevents();
+#endif
 	lua_close(L);
 	return 0;
 }

lsyncd.h

@@ -116,10 +116,20 @@ extern void unobserve_fd(int fd);
 /*-----------------------------------------------------------------------------
  * inotify
  */
+#ifdef LSYNCD_WITH_INOTIFY
 extern void register_inotify(lua_State *L);
 extern void open_inotify(lua_State *L);
 extern void close_inotify();
+#endif
 
+/*-----------------------------------------------------------------------------
+ * /dev/fsevents
+ */
+#ifdef LSYNCD_WITH_FSEVENTS
+extern void register_fsevents(lua_State *L);
+extern void open_fsevents(lua_State *L);
+extern void close_fsevents();
+#endif
 
 
 #endif