From c42412e1643c88c81cf5b38404cc010881437fe9 Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Mon, 29 Apr 2024 11:03:47 +0200
Subject: OpenBSD port work

---
 src/dged/reactor-kqueue.c | 112 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 104 insertions(+), 8 deletions(-)

(limited to 'src/dged/reactor-kqueue.c')

diff --git a/src/dged/reactor-kqueue.c b/src/dged/reactor-kqueue.c
index 5543c04..58ab7af 100644
--- a/src/dged/reactor-kqueue.c
+++ b/src/dged/reactor-kqueue.c
@@ -1,45 +1,141 @@
 #include "reactor.h"
 
+#include <errno.h>
+#include <fcntl.h>
 #include <stdlib.h>
+#include <string.h>
+#include <sys/event.h>
+#include <sys/types.h>
+#include <unistd.h>
 
-struct reactor {
+#include "minibuffer.h"
 
+struct reactor {
+  int queue;
+  struct kevent events[16];
+  uint32_t nevents;
 };
 
 struct reactor *reactor_create() {
-  struct reactor *reactor = calloc(1, sizeof(struct reactor));
+  int queue = kqueue();
+  if (queue < 0) {
+    return NULL;
+  }
 
+  struct reactor *reactor = calloc(1, sizeof(struct reactor));
+  reactor->queue = queue;
+  reactor->nevents = 0;
   return reactor;
 }
 
 void reactor_destroy(struct reactor *reactor) {
+  close(reactor->queue);
+  reactor->queue = -1;
   free(reactor);
 }
 
 void reactor_update(struct reactor *reactor) {
+  int events = kevent(reactor->queue, NULL, 0, reactor->events, 16, NULL);
+  if (events == -1) {
+    // TODO: what to do here?
+    return;
+  }
 
+  reactor->nevents = events;
 }
 
 bool reactor_poll_event(struct reactor *reactor, uint32_t ev_id) {
+  for (uint32_t ei = 0; ei < reactor->nevents; ++ei) {
+    struct kevent *ev = &reactor->events[ei];
+
+    if (ev->ident == ev_id) {
+      return true;
+    }
+  }
+
   return false;
 }
 
-uint32_t reactor_register_interest(struct reactor *reactor, int fd, enum interest interest) {
-  return -1;
+uint32_t reactor_register_interest(struct reactor *reactor, int fd,
+                                   enum interest interest) {
+  struct kevent changes[2] = {0};
+  uint32_t nchanges = 0;
+
+  if ((interest & ReadInterest) != 0) {
+    EV_SET(&changes[0], fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
+    ++nchanges;
+  }
+
+  if ((interest & WriteInterest) != 0) {
+    EV_SET(&changes[1], fd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
+    ++nchanges;
+  }
+
+  if (kevent(reactor->queue, changes, nchanges, NULL, 0, NULL) < 0) {
+    return -1;
+  }
+
+  return fd;
 }
 
-uint32_t reactor_watch_file(struct reactor *reactor, const char *path, uint32_t mask) {
-  return -1;
+uint32_t reactor_watch_file(struct reactor *reactor, const char *path,
+                            uint32_t mask) {
+
+  uint32_t fflags = NOTE_WRITE | NOTE_DELETE | NOTE_RENAME | NOTE_REVOKE;
+  int fd = open(path, O_RDONLY);
+  if (fd < 0) {
+    minibuffer_echo_timeout(4, "failed to watch %s: %s", path, strerror(errno));
+    return 0;
+  }
+
+  struct kevent new_event;
+  EV_SET(&new_event, fd, EVFILT_VNODE, EV_ADD | EV_CLEAR | EV_ENABLE, fflags, 0,
+         NULL);
+  if (kevent(reactor->queue, &new_event, 1, NULL, 0, NULL) < 0) {
+    return 0;
+  }
+
+  return fd;
 }
 
 void reactor_unwatch_file(struct reactor *reactor, uint32_t id) {
-
+  // all kevents for this fd are removed automatically when closed
+  close(id);
 }
 
 bool reactor_next_file_event(struct reactor *reactor, struct file_event *out) {
-  return false;
+
+  // find the next vnode event and pop it from the events
+  struct kevent ev;
+  bool found = false;
+  for (uint32_t e = 0; e < reactor->nevents; ++e) {
+    if (reactor->events[e].filter == EVFILT_VNODE) {
+      ev = reactor->events[e];
+      reactor->events[e] = reactor->events[reactor->nevents - 1];
+      --reactor->nevents;
+      found = true;
+      break;
+    }
+  }
+
+  if (!found) {
+    return false;
+  }
+
+  out->mask = FileWritten;
+  if ((ev.fflags & NOTE_DELETE) || (ev.fflags & NOTE_RENAME) ||
+      (ev.fflags & NOTE_REVOKE)) {
+    out->mask |= LastEvent;
+  }
+
+  out->id = ev.ident;
+  return true;
 }
 
 void reactor_unregister_interest(struct reactor *reactor, uint32_t ev_id) {
+  struct kevent changes[2] = {0};
+  EV_SET(&changes[0], ev_id, EVFILT_READ, EV_DELETE, 0, 0, NULL);
+  EV_SET(&changes[1], ev_id, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
 
+  kevent(reactor->queue, changes, 2, NULL, 0, NULL);
 }
-- 
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