[tracker] tracker-monitor: add support for GKqueueDirectoryMonitor

[Antoine Jacoutot <ajacoutot src gnome org>]

commit 0fbb71aeba428789340e53bf10e1d9afbc0f3193
Author: Antoine Jacoutot <ajacoutot gnome org>
Date:   Thu Nov 15 20:06:50 2012 +0100

    tracker-monitor: add support for GKqueueDirectoryMonitor
    
    kqueue(2) support for BSD systems was recently introduced in GLib. Make
    tracker aware of this new backend.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=688371

 src/libtracker-miner/tracker-monitor.c |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-miner/tracker-monitor.c b/src/libtracker-miner/tracker-monitor.c
index 2a18165..9b1ab4e 100644
--- a/src/libtracker-miner/tracker-monitor.c
+++ b/src/libtracker-miner/tracker-monitor.c
@@ -23,6 +23,13 @@
 #include <string.h>
 #include <gio/gio.h>
 
+#if defined (__OpenBSD__) || defined (__FreeBSD__) || defined (__NetBSD__) || defined (__APPLE__)
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#define TRACKER_MONITOR_KQUEUE
+#endif
+
 #include "tracker-monitor.h"
 #include "tracker-marshal.h"
 
@@ -119,6 +126,7 @@ static void           tracker_monitor_get_property (GObject        *object,
                                                     guint           prop_id,
                                                     GValue         *value,
                                                     GParamSpec     *pspec);
+static guint          get_kqueue_limit             (void);
 static guint          get_inotify_limit            (void);
 static GFileMonitor * directory_monitor_new        (TrackerMonitor *monitor,
                                                     GFile          *file);
@@ -296,6 +304,12 @@ tracker_monitor_init (TrackerMonitor *object)
 			 */
 			priv->monitor_limit = MAX (priv->monitor_limit, 0);
 		}
+		else if (strcmp (name, "GKqueueDirectoryMonitor") == 0) {
+			/* Using kqueue(2) */
+			g_message ("Monitor backend is kqueue");
+
+			priv->monitor_limit = get_kqueue_limit ();
+		}
 		else if (strcmp (name, "GFamDirectoryMonitor") == 0) {
 			/* Using Fam */
 			g_message ("Monitor backend is Fam");
@@ -400,6 +414,20 @@ tracker_monitor_get_property (GObject      *object,
 }
 
 static guint
+get_kqueue_limit (void)
+{
+	guint limit = 400;
+
+#ifdef TRACKER_MONITOR_KQUEUE
+	struct rlimit rl;
+	if (getrlimit (RLIMIT_NOFILE, &rl) == 0)
+		limit = (rl.rlim_cur * 90) / 100;
+#endif /* TRACKER_MONITOR_KQUEUE */
+
+	return limit;
+}
+
+static guint
 get_inotify_limit (void)
 {
 	GError      *error = NULL;