diff --git a/configure.ac b/configure.ac
index 651806de..efa34e14 100644
--- a/configure.ac
+++ b/configure.ac
@@ -414,11 +414,15 @@ case "$host_os" in
 		AC_DEFINE(BROKEN_CMSG_FIRSTHDR)
 		PLATFORM=darwin
 		;;
+	*dragonfly*)
+		AC_MSG_RESULT(dragonfly)
+		PLATFORM=dragonfly
+		;;
 	*linux*)
 		AC_MSG_RESULT(linux)
 		PLATFORM=linux
 		;;
-	*freebsd*|*dragonfly*)
+	*freebsd*)
 		AC_MSG_RESULT(freebsd)
 		PLATFORM=freebsd
 		;;
@@ -450,6 +454,7 @@ esac
 AC_SUBST(PLATFORM)
 AM_CONDITIONAL(IS_AIX, test "x$PLATFORM" = xaix)
 AM_CONDITIONAL(IS_DARWIN, test "x$PLATFORM" = xdarwin)
+AM_CONDITIONAL(IS_DRAGONFLY, test "x$PLATFORM" = xdragonfly)
 AM_CONDITIONAL(IS_LINUX, test "x$PLATFORM" = xlinux)
 AM_CONDITIONAL(IS_FREEBSD, test "x$PLATFORM" = xfreebsd)
 AM_CONDITIONAL(IS_NETBSD, test "x$PLATFORM" = xnetbsd)
diff --git a/osdep-dragonfly.c b/osdep-dragonfly.c
new file mode 100644
index 00000000..b15abf96
--- /dev/null
+++ b/osdep-dragonfly.c
@@ -0,0 +1,126 @@
+/* $Id$ */
+
+/*
+ * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+
+#include <err.h>
+#include <errno.h>
+#include <event.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+struct kinfo_proc	*cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
+char			*osdep_get_name(int, char *);
+struct event_base	*osdep_event_init(void);
+
+#ifndef nitems
+#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
+#endif
+
+#define is_runnable(p) \
+	((p)->kp_stat == SACTIVE || (p)->kp_stat == SIDL)
+#define is_stopped(p) \
+	((p)->kp_stat == SSTOP || (p)->kp_stat == SZOMB)
+
+struct kinfo_proc *
+cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
+{
+	if (is_runnable(p1) && !is_runnable(p2))
+		return (p1);
+	if (!is_runnable(p1) && is_runnable(p2))
+		return (p2);
+
+	if (is_stopped(p1) && !is_stopped(p2))
+		return (p1);
+	if (!is_stopped(p1) && is_stopped(p2))
+		return (p2);
+
+	if (strcmp(p1->kp_comm, p2->kp_comm) < 0)
+		return (p1);
+	if (strcmp(p1->kp_comm, p2->kp_comm) > 0)
+		return (p2);
+
+	if (p1->kp_pid > p2->kp_pid)
+		return (p1);
+	return (p2);
+}
+
+char *
+osdep_get_name(int fd, char *tty)
+{
+	int		 mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
+	struct stat	 sb;
+	size_t		 len;
+	struct kinfo_proc *buf, *newbuf, *bestp;
+	u_int		 i;
+	char		*name;
+
+	buf = NULL;
+
+	if (stat(tty, &sb) == -1)
+		return (NULL);
+	if ((mib[3] = tcgetpgrp(fd)) == -1)
+		return (NULL);
+
+retry:
+	if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
+		return (NULL);
+	len = (len * 5) / 4;
+
+	if ((newbuf = realloc(buf, len)) == NULL)
+		goto error;
+	buf = newbuf;
+
+	if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
+		if (errno == ENOMEM)
+			goto retry;
+		goto error;
+	}
+
+	bestp = NULL;
+	for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
+		if (buf[i].kp_tdev != sb.st_rdev)
+			continue;
+		if (bestp == NULL)
+			bestp = &buf[i];
+		else
+			bestp = cmp_procs(&buf[i], bestp);
+	}
+
+	name = NULL;
+	if (bestp != NULL)
+		name = strdup(bestp->kp_comm);
+
+	free(buf);
+	return (name);
+
+error:
+	free(buf);
+	return (NULL);
+}
+
+struct event_base *
+osdep_event_init(void)
+{
+	return (event_init());
+}