From 71ef23ae16b0e310e66f3bf622cebefb9ec6b208 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Tue, 19 May 2026 15:00:02 +0300
Subject: v6: add KindAccept and wire accept/accept4

---
 cmd/ioworkload/scenario_socket.go | 46 +++++++++++++++++++++++++++++++++++++++
 cmd/ioworkload/scenarios.go       |  1 +
 2 files changed, 47 insertions(+)

(limited to 'cmd')

diff --git a/cmd/ioworkload/scenario_socket.go b/cmd/ioworkload/scenario_socket.go
index f633186..9885cbb 100644
--- a/cmd/ioworkload/scenario_socket.go
+++ b/cmd/ioworkload/scenario_socket.go
@@ -2,6 +2,8 @@ package main
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 	"syscall"
 )
 
@@ -29,3 +31,47 @@ func socketpairBasic() error {
 	}
 	return nil
 }
+
+func socketAcceptLifecycle() error {
+	dir, err := os.MkdirTemp("", "ioworkload-socket-accept-")
+	if err != nil {
+		return fmt.Errorf("create temp dir: %w", err)
+	}
+	defer os.RemoveAll(dir)
+
+	socketPath := filepath.Join(dir, "accept.sock")
+
+	listenerFD, err := syscall.Socket(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
+	if err != nil {
+		return fmt.Errorf("listener socket: %w", err)
+	}
+	defer syscall.Close(listenerFD) //nolint:errcheck
+
+	if err := syscall.Bind(listenerFD, &syscall.SockaddrUnix{Name: socketPath}); err != nil {
+		return fmt.Errorf("bind: %w", err)
+	}
+	if err := syscall.Listen(listenerFD, 1); err != nil {
+		return fmt.Errorf("listen: %w", err)
+	}
+
+	clientFD, err := syscall.Socket(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
+	if err != nil {
+		return fmt.Errorf("client socket: %w", err)
+	}
+	defer syscall.Close(clientFD) //nolint:errcheck
+
+	if err := syscall.Connect(clientFD, &syscall.SockaddrUnix{Name: socketPath}); err != nil {
+		return fmt.Errorf("connect: %w", err)
+	}
+
+	acceptedFD, _, err := syscall.Accept4(listenerFD, 0)
+	if err != nil {
+		return fmt.Errorf("accept4: %w", err)
+	}
+	defer syscall.Close(acceptedFD) //nolint:errcheck
+
+	if err := syscall.Shutdown(acceptedFD, syscall.SHUT_RDWR); err != nil {
+		return fmt.Errorf("shutdown accepted fd: %w", err)
+	}
+	return nil
+}
diff --git a/cmd/ioworkload/scenarios.go b/cmd/ioworkload/scenarios.go
index aedbffa..db5b549 100644
--- a/cmd/ioworkload/scenarios.go
+++ b/cmd/ioworkload/scenarios.go
@@ -27,6 +27,7 @@ var scenarios = map[string]func() error{
 	"retbytes-phase-a":            retbytesPhaseA,
 	"socket-basic":                socketBasic,
 	"socketpair-basic":            socketpairBasic,
+	"socket-accept-lifecycle":     socketAcceptLifecycle,
 	"family-mixed":                familyMixed,
 	"close-basic":                 closeBasic,
 	"close-range":                 closeRange,
-- 
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