From ba78b68ab19cce32d1558f142e145053082935a1 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Sat, 22 Mar 2025 21:30:37 +0200
Subject: initial golang impl of fcntl

---
 internal/eventloop.go | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'internal/eventloop.go')

diff --git a/internal/eventloop.go b/internal/eventloop.go
index 555a8f8..c9797b2 100644
--- a/internal/eventloop.go
+++ b/internal/eventloop.go
@@ -104,6 +104,9 @@ func (e *eventLoop) events(ctx context.Context, rawCh <-chan []byte) <-chan *eve
 		for {
 			select {
 			case raw := <-rawCh:
+				if len(raw) == 0 {
+					continue
+				}
 				e.processRawEvent(raw, ch)
 			default:
 				select {
@@ -144,6 +147,8 @@ func (e *eventLoop) processRawEvent(raw []byte, ch chan<- *event.Pair) {
 		if ev, ok := e.filter.pathEvent(NewPathEvent(raw)); ok {
 			e.syscallEnter(ev)
 		}
+	case ENTER_FCNTL_EVENT:
+		e.syscallEnter(NewFcntlEvent(raw))
 	default:
 		panic(fmt.Sprintf("unhandled event type %v: %v", EventType(raw[0]), raw))
 	}
@@ -217,7 +222,7 @@ func (e *eventLoop) syscallExit(exitEv event.Event, ch chan<- *event.Pair) {
 				delete(e.files, fd)
 			}
 		} else {
-			ev.File = file.NewFdWithPid(fd, ev.EnterEv.(*FdEvent).Pid)
+			ev.File = file.NewFdWithPid(fd, v.Pid)
 		}
 		ev.Comm = e.comm(ev.EnterEv.GetTid())
 		if !e.filter.eventPair(ev) {
@@ -230,6 +235,19 @@ func (e *eventLoop) syscallExit(exitEv event.Event, ch chan<- *event.Pair) {
 			ev.Recycle()
 			return
 		}
+	case *FcntlEvent:
+		ev.Comm = e.comm(ev.EnterEv.GetTid())
+		if !e.filter.eventPair(ev) {
+			ev.Recycle()
+			return
+		}
+		fd := int32(v.Fd)
+		if file_, ok := e.files[fd]; ok {
+			ev.File = file_
+		} else {
+			ev.File = file.NewFdWithPid(fd, v.Pid)
+		}
+		// TODO: Implement more details here (e.g. changing the file open flags)
 
 	default:
 		panic(fmt.Sprintf("unknown type: %v", v))
-- 
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