diff --git a/include/eventloop.h b/include/eventloop.h
index 7674215..bec59d1 100644
--- a/include/eventloop.h
+++ b/include/eventloop.h
@@ -4,13 +4,16 @@
 #include <stdbool.h>
 #include <time.h>
 
-#include "platform.h"
 #include "list.h"
 #include "scoped.h"
 
 #define OWD_EVENT_READABLE (1 << 0)
 #define OWD_EVENT_WRITABLE (1 << 1)
 
+#if defined(OWD_EVENTLOOP_KQUEUE)
+#define OWD_EVENTLOOP_KQUEUE_FILTERS_MAX 2
+#endif
+
 enum owd_event_source {
   OWD_EVENT_SOURCE_FD,
   OWD_EVENT_SOURCE_TIMER,
@@ -25,12 +28,14 @@ struct owd_event {
   owd_event_id_t id;
   struct intrusive_list list;
 
-#if defined(EVENTLOOP_KQUEUE)
+#if defined(OWD_EVENTLOOP_KQUEUE)
   uintptr_t kqueue_ident;
-  short kqueue_filter;
+  uint16_t kqueue_filters[OWD_EVENTLOOP_KQUEUE_FILTERS_MAX];
+  uint8_t kqueue_filters_len;
 
-#elif defined(EVENTLOOP_EPOLL)
+#elif defined(OWD_EVENTLOOP_EPOLL)
   int epoll_registered_fd;
+  bool epoll_fd_owned;
 
 #endif
 };
@@ -38,11 +43,11 @@ struct owd_event {
 struct owd_eventloop {
   struct intrusive_list event_list;
 
-#if defined(EVENTLOOP_KQUEUE)
+#if defined(OWD_EVENTLOOP_KQUEUE)
   uintptr_t kqueue_timer_next;
   int kqueue_fd;
 
-#elif defined(EVENTLOOP_EPOLL)
+#elif defined(OWD_EVENTLOOP_EPOLL)
   int epoll_fd;
 
 #endif
@@ -55,7 +60,7 @@ static inline bool owd_event_id_eq(owd_event_id_t eid1, owd_event_id_t eid2) {
 int owd_eventloop_init(struct owd_eventloop *el);
 void owd_eventloop_cleanup(struct owd_eventloop *el);
 
-int owd_eventloop_wait(struct owd_eventloop *el, owd_event_id_t *id_out, const struct timespec *timeout);
+int owd_eventloop_wait(struct owd_eventloop *el, owd_event_id_t *id_out, uint32_t *flags_out, const struct timespec *timeout);
 int owd_eventloop_clear(struct owd_eventloop *el, struct owd_event *e);
 void owd_eventloop_remove(struct owd_eventloop *el, struct owd_event *e);
 int owd_eventloop_add_timer(struct owd_eventloop *el, struct owd_event *e, uint64_t millis, bool oneshot);
diff --git a/include/eventloop_platform.h b/include/eventloop_platform.h
index 4b2ffdf..c4b89cf 100644
--- a/include/eventloop_platform.h
+++ b/include/eventloop_platform.h
@@ -7,6 +7,6 @@ void owd_platform_el_cleanup(struct owd_eventloop *el);
 void owd_platform_el_event_remove(struct owd_eventloop *el, struct owd_event *e);
 void owd_platform_el_event_cleanup(struct owd_eventloop *el, struct owd_event *e);
 int owd_platform_el_event_clear(struct owd_eventloop *el, struct owd_event *e);
-int owd_platform_el_wait(struct owd_eventloop *el, owd_event_id_t *id_out, const struct timespec *timeout);
+int owd_platform_el_wait(struct owd_eventloop *el, owd_event_id_t *id_out, uint32_t *flags_out, const struct timespec *timeout);
 int owd_platform_el_add_timer(struct owd_eventloop *el, struct owd_event *e, uint64_t millis, bool oneshot);
 int owd_platform_el_add_fd(struct owd_eventloop *el, struct owd_event *e, int fd, uint32_t flags);
diff --git a/include/platform.h b/include/platform.h
deleted file mode 100644
index 1351c1d..0000000
--- a/include/platform.h
+++ /dev/null
@@ -1,34 +0,0 @@
-#pragma once
-
-#if defined(__linux__)
-#define PLATFORM_LINUX
-#define EVENTLOOP_EPOLL
-
-#elif defined(__APPLE__) && defined(__MACH__)
-#define PLATFORM_OSX
-#define EVENTLOOP_KQUEUE
-
-#elif defined(__FreeBSD__)
-#define PLATFORM_BSD
-#define PLATFORM_FREEBSD
-#define EVENTLOOP_KQUEUE
-
-#elif defined(__NetBSD__)
-#define PLATFORM_BSD
-#define PLATFORM_NETBSD
-#define EVENTLOOP_KQUEUE
-
-#elif defined(__OpenBSD__)
-#define PLATFORM_BSD
-#define PLATFORM_OPENBSD
-#define EVENTLOOP_KQUEUE
-
-#elif defined(__DragonFly__)
-#define PLATFORM_BSD
-#define PLATFORM_DRAGONFLY
-#define EVENTLOOP_KQUEUE
-
-#else
-#error "Failed to detect supported platform"
-
-#endif
diff --git a/src/eventloop.c b/src/eventloop.c
index b5b6492..48e677c 100644
--- a/src/eventloop.c
+++ b/src/eventloop.c
@@ -32,9 +32,10 @@ void owd_eventloop_cleanup(struct owd_eventloop *el) {
 int owd_eventloop_wait(
   struct owd_eventloop *el,
   owd_event_id_t *id_out,
+  uint32_t *flags_out,
   const struct timespec *timeout)
 {
-  return owd_platform_el_wait(el, id_out, timeout);
+  return owd_platform_el_wait(el, id_out, flags_out, timeout);
 }
 
 int owd_eventloop_clear(struct owd_eventloop *el, struct owd_event *e) {
diff --git a/src/eventloop_epoll.c b/src/eventloop_epoll.c
index e69de29..a0797ef 100644
--- a/src/eventloop_epoll.c
+++ b/src/eventloop_epoll.c
@@ -0,0 +1,79 @@
+#include <unistd.h>
+#include <errno.h>
+#include <sys/epoll.h>
+
+#include "eventloop.h"
+#include "eventloop_platform.h"
+
+int owd_platform_el_init(struct owd_eventloop *el) {
+  if ((el->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
+    return -1;
+  return 0;
+}
+
+void owd_platform_el_cleanup(struct owd_eventloop *el) {
+  close(el->epoll_fd);
+}
+
+void owd_platform_el_event_remove(struct owd_eventloop *el, struct owd_event *e) {
+  epoll_ctl(el->epoll_fd, EPOLL_CTL_DEL, e->epoll_registered_fd, NULL);
+}
+
+void owd_platform_el_event_cleanup(struct owd_eventloop *el, struct owd_event *e) {
+  if (e->epoll_fd_owned && (e->epoll_registered_fd >= 0)) {
+    close(e->epoll_registered_fd);
+    e->epoll_registered_fd = -1;
+  }
+}
+
+static int clear_timerfd(int fd) {
+  uint64_t tfd_buf;
+  ssize_t res;
+
+  do {
+    res = read(fd, &tfd_buf, sizeof(tfd_buf));
+  } while ((res < 0) && (errno == EINTR));
+  
+  if (res < 0)
+    return -1;
+
+  return 0;
+}
+
+int owd_platform_el_event_clear(struct owd_eventloop *el, struct owd_event *e) {
+  int res;
+
+  if ((e->id.source == OWD_EVENT_SOURCE_TIMER) && (e->epoll_registered_fd >= 0)) {
+    if ((res = clear_timerfd(e->epoll_registered_fd)))
+      return res;
+  }
+
+  return 0;
+}
+
+int owd_platform_el_wait(
+  struct owd_eventloop *el,
+  owd_event_id_t *id_out,
+  uint32_t *flags_out,
+  const struct timespec *timeout)
+{
+
+}
+
+int owd_platform_el_add_timer(
+  struct owd_eventloop *el,
+  struct owd_event *e,
+  uint64_t millis,
+  bool oneshot)
+{
+
+}
+
+int owd_platform_el_add_fd(
+  struct owd_eventloop *el,
+  struct owd_event *e,
+  int fd,
+  uint32_t flags)
+{
+
+}
diff --git a/src/eventloop_kqueue.c b/src/eventloop_kqueue.c
index 4ba7153..3f3d89d 100644
--- a/src/eventloop_kqueue.c
+++ b/src/eventloop_kqueue.c
@@ -1,14 +1,56 @@
 #include <unistd.h>
 #include <string.h>
+#include <fcntl.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/event.h>
 #include <sys/time.h>
 
+#include "eventloop.h"
 #include "eventloop_platform.h"
+#include "io.h"
+
+struct el_kqueue_add_params {
+  uint16_t filter;
+  uint16_t flags;
+  int64_t data;
+};
+
+static int new_kqueue(void) {
+#if defined(OWD_PLATFORM_FREEBSD)
+  return kqueuex(KQUEUE_CLOEXEC);
+
+#elif defined(OWD_PLATFORM_OPENBSD) || defined(OWD_PLATFORM_NETBSD)
+  return kqueue1(O_CLOEXEC);
+
+#elif defined(OWD_PLATFORM_DARWIN)
+  // Darwin / XNU sets cloexec by default:
+  // - https://github.com/apple/darwin-xnu/blob/2ff845c2e033bd0ff64b5b6aa6063a1f8f65aa32/bsd/kern/kern_event.c#L3029
+  // - https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/bsd/kern/kern_event.c#L3070
+  return kqueue();
+
+#else
+  FD_SCOPED(fd);
+
+  if ((fd = kqueue()) < 0)
+    return -1;
+
+  // FIXME: this is obviously not thread-safe, so if we ever use threads then this needs to be
+  // revisited.
+  //
+  // One option on dragonfly bsd would be to fork, create the kqueue in the fork, then send it
+  // back to the parent in a unix socket control message (SCM_RIGHTS) with MSG_CMSG_CLOEXEC set.
+  // Hopefully a better option exists.
+  if (fcntl(fd, F_SETFD, FD_CLOEXEC))
+    return -1;
+
+  return FD_RELEASE(&fd);
+
+#endif
+}
 
 int owd_platform_el_init(struct owd_eventloop *el) {
-  if ((el->kqueue_fd = kqueue()) < 0)
+  if ((el->kqueue_fd = new_kqueue()) < 0)
     return -1;
   el->kqueue_timer_next = 0;
   return 0;
@@ -19,13 +61,24 @@ void owd_platform_el_cleanup(struct owd_eventloop *el) {
 }
 
 void owd_platform_el_event_remove(struct owd_eventloop *el, struct owd_event *e) {
-  struct kevent kev;
+  struct kevent kevs[OWD_EVENTLOOP_KQUEUE_FILTERS_MAX];
+  unsigned i;
+  unsigned filters_len;
+
+  if ((filters_len = e->kqueue_filters_len) > OWD_EVENTLOOP_KQUEUE_FILTERS_MAX)
+    filters_len = OWD_EVENTLOOP_KQUEUE_FILTERS_MAX;
+
+  if (!filters_len)
+    return;
+
+  memset(kevs, 0, sizeof(kevs));
+  for (i = 0; i < filters_len; i++) {
+    kevs[i].ident = e->kqueue_ident;
+    kevs[i].filter = e->kqueue_filters[i];
+    kevs[i].flags = EV_DELETE;
+  }
 
-  memset(&kev, 0, sizeof(kev));
-  kev.ident = e->kqueue_ident;
-  kev.filter = e->kqueue_filter;
-  kev.flags = EV_DELETE;
-  kevent(el->kqueue_fd, &kev, 1, NULL, 0, NULL);
+  kevent(el->kqueue_fd, kevs, filters_len, NULL, 0, NULL);
 }
 
 // TODO: close timerfd on linux
@@ -44,6 +97,7 @@ int owd_platform_el_event_clear(struct owd_eventloop *el, struct owd_event *e) {
 int owd_platform_el_wait(
   struct owd_eventloop *el,
   owd_event_id_t *id_out,
+  uint32_t *flags_out,
   const struct timespec *timeout)
 {
   struct kevent kev;
@@ -60,37 +114,54 @@ int owd_platform_el_wait(
   }
 
   id_out->obj = kev.ident;
+  *flags_out = 0;
 
-  if (kev.filter & EVFILT_TIMER)
+  if (kev.filter & EVFILT_TIMER) {
     id_out->source = OWD_EVENT_SOURCE_TIMER;
-  else
+    *flags_out |= OWD_EVENT_READABLE;
+  }
+  else {
     id_out->source = OWD_EVENT_SOURCE_FD;
+    if (kev.filter & EVFILT_READ)
+      *flags_out |= OWD_EVENT_READABLE;
+    if (kev.filter & EVFILT_WRITE)
+      *flags_out |= OWD_EVENT_WRITABLE;
+  }
 
   return 0;
 }
 
-static int el_kqueue_add_one(
+static int el_kqueue_add(
   struct owd_eventloop *el,
   struct owd_event *e,
   uintptr_t ident,
-  uint16_t filter,
-  uint16_t flags,
-  int64_t data)
+  const struct el_kqueue_add_params *params,
+  uint8_t params_len)
 {
-  struct kevent kev;
+  struct kevent kevs[OWD_EVENTLOOP_KQUEUE_FILTERS_MAX];
+  unsigned i;
 
-  memset(&kev, 0, sizeof(kev));
-  kev.ident = ident;
-  kev.filter = filter;
-  kev.flags = flags;
-  kev.data = data;
+  if (!params_len || (params_len > OWD_EVENTLOOP_KQUEUE_FILTERS_MAX)) {
+    errno = EINVAL;
+    return -1;
+  }
+
+  memset(kevs, 0, sizeof(kevs));
+  for (i = 0; i < params_len; i++) {
+    kevs[i].ident = ident;
+    kevs[i].filter = params[i].filter;
+    kevs[i].flags = EV_ADD | params[i].flags;
+    kevs[i].data = params[i].data;
+  }
 
-  if (kevent(el->kqueue_fd, &kev, 1, NULL, 0, NULL))
+  if (kevent(el->kqueue_fd, kevs, params_len, NULL, 0, NULL))
     return -1;
 
   e->id.obj = ident;
   e->kqueue_ident = ident;
-  e->kqueue_filter = filter;
+  e->kqueue_filters_len = params_len;
+  for (i = 0; i < params_len; i++)
+    e->kqueue_filters[i] = params[i].filter;
 
   return 0;
 }
@@ -101,14 +172,17 @@ int owd_platform_el_add_timer(
   uint64_t millis,
   bool oneshot)
 {
-  uint16_t kev_flags;
   int res;
+  struct el_kqueue_add_params params;
 
-  kev_flags = 0;
+  params.filter = EVFILT_TIMER;
+  params.data = millis;
+
+  params.flags = 0;
   if (oneshot)
-    kev_flags |= EV_ONESHOT;
+    params.flags |= EV_ONESHOT;
 
-  if ((res = el_kqueue_add_one(el, e, el->kqueue_timer_next, EVFILT_TIMER, EV_ADD | kev_flags, millis)))
+  if ((res = el_kqueue_add(el, e, el->kqueue_timer_next, &params, 1)))
     return res;
 
   el->kqueue_timer_next++;
@@ -122,6 +196,26 @@ int owd_platform_el_add_fd(
   int fd,
   uint32_t flags)
 {
-  // TODO
-  return 0;
+  struct el_kqueue_add_params params[2];
+  uint8_t params_len;
+
+  params_len = 0;
+
+  if (flags & OWD_EVENT_READABLE) {
+    params[params_len++] = (struct el_kqueue_add_params) {
+      .filter = EVFILT_READ,
+      .flags = 0,
+      .data = 0,
+    };
+  }
+
+  if (flags & OWD_EVENT_WRITABLE) {
+    params[params_len++] = (struct el_kqueue_add_params) {
+      .filter = EVFILT_WRITE,
+      .flags = 0,
+      .data = 0,
+    };
+  }
+
+  return el_kqueue_add(el, e, (uintptr_t)fd, params, params_len);
 }