diff --git a/posix.mak b/posix.mak
index 2ef49180d94..29af14bff84 100644
--- a/posix.mak
+++ b/posix.mak
@@ -97,6 +97,8 @@ MANIFEST= \
 	src/core/sync/rwmutex.d \
 	src/core/sync/semaphore.d \
 	\
+	src/core/sys/freebsd/sys/event.d \
+	\
 	src/core/sys/osx/mach/dyld.d \
 	src/core/sys/osx/mach/getsect.d \
 	src/core/sys/osx/mach/kern_return.d \
@@ -275,6 +277,8 @@ SRC_D_MODULES = \
 	core/stdc/time \
 	core/stdc/wchar_ \
 	\
+	core/sys/freebsd/sys/event \
+	\
 	core/sys/posix/sys/select \
 	core/sys/posix/sys/socket \
 	core/sys/posix/sys/stat \
@@ -442,6 +446,8 @@ IMPORTS=\
 	$(IMPDIR)/core/sync/rwmutex.di \
 	$(IMPDIR)/core/sync/semaphore.di \
 	\
+	$(IMPDIR)/core/sys/freebsd/sys/event.di \
+	\
 	$(IMPDIR)/core/sys/osx/mach/kern_return.di \
 	$(IMPDIR)/core/sys/osx/mach/port.di \
 	$(IMPDIR)/core/sys/osx/mach/semaphore.di \
diff --git a/src/core/sys/freebsd/sys/event.d b/src/core/sys/freebsd/sys/event.d
new file mode 100644
index 00000000000..71c894db7c2
--- /dev/null
+++ b/src/core/sys/freebsd/sys/event.d
@@ -0,0 +1,129 @@
+/**
+ * D header file for FreeBSD.
+ *
+ * Copyright: Copyright Martin Nowak 2012.
+ * License:   <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
+ * Authors:   Martin Nowak
+ */
+
+/*          Copyright Martin Nowak 2012.
+ * Distributed under the Boost Software License, Version 1.0.
+ *    (See accompanying file LICENSE_1_0.txt or copy at
+ *          http://www.boost.org/LICENSE_1_0.txt)
+ */
+module core.sys.freebsd.sys.event;
+
+import core.stdc.stdint;    // intptr_t, uintptr_t
+import core.sys.posix.time; // timespec
+
+extern(C):
+
+enum
+{
+    EVFILT_READ     =  -1,
+    EVFILT_WRITE    =  -2,
+    EVFILT_AIO      =  -3, /* attached to aio requests */
+    EVFILT_VNODE    =  -4, /* attached to vnodes */
+    EVFILT_PROC     =  -5, /* attached to struct proc */
+    EVFILT_SIGNAL   =  -6, /* attached to struct proc */
+    EVFILT_TIMER    =  -7, /* timers */
+    // EVFILT_NETDEV   =  -8, /* no longer supported */
+    EVFILT_FS       =  -9, /* filesystem events */
+    EVFILT_LIO      = -10, /* attached to lio requests */
+    EVFILT_USER     = -11, /* User events */
+    EVFILT_SYSCOUNT =  11,
+}
+
+extern(D) void EV_SET(kevent_t* kevp, typeof(kevent_t.tupleof) args)
+{
+    *kevp = kevent_t(args);
+}
+
+struct kevent_t
+{
+    uintptr_t    ident; /* identifier for this event */
+    short       filter; /* filter for event */
+    ushort       flags;
+    uint        fflags;
+    intptr_t      data;
+    void        *udata; /* opaque user data identifier */
+};
+
+enum
+{
+    /* actions */
+    EV_ADD      = 0x0001, /* add event to kq (implies enable) */
+    EV_DELETE   = 0x0002, /* delete event from kq */
+    EV_ENABLE   = 0x0004, /* enable event */
+    EV_DISABLE  = 0x0008, /* disable event (not reported) */
+
+    /* flags */
+    EV_ONESHOT  = 0x0010, /* only report one occurrence */
+    EV_CLEAR    = 0x0020, /* clear event state after reporting */
+    EV_RECEIPT  = 0x0040, /* force EV_ERROR on success, data=0 */
+    EV_DISPATCH = 0x0080, /* disable event after reporting */
+
+    EV_SYSFLAGS = 0xF000, /* reserved by system */
+    EV_FLAG1    = 0x2000, /* filter-specific flag */
+
+    /* returned values */
+    EV_EOF      = 0x8000, /* EOF detected */
+    EV_ERROR    = 0x4000, /* error, data contains errno */
+}
+
+enum
+{
+    /*
+     * data/hint flags/masks for EVFILT_USER, shared with userspace
+     *
+     * On input, the top two bits of fflags specifies how the lower twenty four
+     * bits should be applied to the stored value of fflags.
+     *
+     * On output, the top two bits will always be set to NOTE_FFNOP and the
+     * remaining twenty four bits will contain the stored fflags value.
+     */
+    NOTE_FFNOP      = 0x00000000, /* ignore input fflags */
+    NOTE_FFAND      = 0x40000000, /* AND fflags */
+    NOTE_FFOR       = 0x80000000, /* OR fflags */
+    NOTE_FFCOPY     = 0xc0000000, /* copy fflags */
+    NOTE_FFCTRLMASK = 0xc0000000, /* masks for operations */
+    NOTE_FFLAGSMASK = 0x00ffffff,
+
+    NOTE_TRIGGER    = 0x01000000, /* Cause the event to be
+                                  triggered for output. */
+
+    /*
+     * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
+     */
+    NOTE_LOWAT      = 0x0001, /* low water mark */
+
+    /*
+     * data/hint flags for EVFILT_VNODE, shared with userspace
+     */
+    NOTE_DELETE     = 0x0001, /* vnode was removed */
+    NOTE_WRITE      = 0x0002, /* data contents changed */
+    NOTE_EXTEND     = 0x0004, /* size increased */
+    NOTE_ATTRIB     = 0x0008, /* attributes changed */
+    NOTE_LINK       = 0x0010, /* link count changed */
+    NOTE_RENAME     = 0x0020, /* vnode was renamed */
+    NOTE_REVOKE     = 0x0040, /* vnode access was revoked */
+
+    /*
+     * data/hint flags for EVFILT_PROC, shared with userspace
+     */
+    NOTE_EXIT       = 0x80000000, /* process exited */
+    NOTE_FORK       = 0x40000000, /* process forked */
+    NOTE_EXEC       = 0x20000000, /* process exec'd */
+    NOTE_PCTRLMASK  = 0xf0000000, /* mask for hint bits */
+    NOTE_PDATAMASK  = 0x000fffff, /* mask for pid */
+
+    /* additional flags for EVFILT_PROC */
+    NOTE_TRACK      = 0x00000001, /* follow across forks */
+    NOTE_TRACKERR   = 0x00000002, /* could not track child */
+    NOTE_CHILD      = 0x00000004, /* am a child process */
+}
+
+int kqueue();
+int kevent(int kq, const kevent_t *changelist, int nchanges,
+           kevent_t *eventlist, int nevents,
+           const timespec *timeout);
diff --git a/win32.mak b/win32.mak
index 0bd5352a664..b565a80966e 100644
--- a/win32.mak
+++ b/win32.mak
@@ -76,6 +76,8 @@ MANIFEST= \
 	src\core\sync\rwmutex.d \
 	src\core\sync\semaphore.d \
 	\
+	src\core\sys\freebsd\sys\event.d \
+	\
 	src\core\sys\osx\pthread.d \
 	src\core\sys\osx\mach\dyld.d \
 	src\core\sys\osx\mach\getsect.d \