From e76a0fe1e2832c5f3c621dac9aa177c795bee7bd Mon Sep 17 00:00:00 2001
From: pantonshire <tom@tomandtally.co.uk>
Date: Sat, 27 Dec 2025 13:34:57 +0000
Subject: [PATCH] epoll event loop fd + timer

---
 src/eventloop_epoll.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/eventloop_epoll.c b/src/eventloop_epoll.c
index 2bbb0fd..2d15458 100644
--- a/src/eventloop_epoll.c
+++ b/src/eventloop_epoll.c
@@ -2,9 +2,11 @@
 #include <unistd.h>
 #include <errno.h>
 #include <sys/epoll.h>
+#include <sys/timerfd.h>
 
 #include "eventloop.h"
 #include "eventloop_platform.h"
+#include "io.h"
 
 int owd_platform_el_init(struct owd_eventloop *el) {
   if ((el->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
@@ -117,7 +119,30 @@ int owd_platform_el_add_timer(
   uint64_t millis,
   bool oneshot)
 {
+  FD_SCOPED(tfd);
+  struct itimerspec spec;
+  struct timespec ts;
+  int res;
+
+  ts.tv_sec = (long)(millis / 1000);
+  ts.tv_nsec = (long)((millis % 1000) * 1000000);
+
+  memset(&spec, 0, sizeof(spec));
+  spec.it_value = ts;
+  if (!oneshot)
+    spec.it_interval = ts;
+
+  if ((tfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC)) < 0)
+    return -1;
 
+  if (timerfd_settime(tfd, 0, &spec, NULL))
+    return -1;
+
+  if ((res = el_epoll_add(el, e, tfd, OWD_EVENT_SOURCE_TIMER, EPOLLIN, true)))
+    return res;
+
+  FD_RELEASE(tfd);
+  return 0;
 }
 
 int owd_platform_el_add_fd(
@@ -126,5 +151,13 @@ int owd_platform_el_add_fd(
   int fd,
   uint32_t flags)
 {
+  uint32_t events;
+
+  events = 0;
+  if (flags & OWD_EVENT_READABLE)
+    events |= EPOLLIN;
+  if (flags & OWD_EVENT_WRITABLE)
+    events |= EPOLLOUT;
 
+  return el_epoll_add(el, e, fd, OWD_EVENT_SOURCE_FD, events, false);
 }