From 641498954fd79772de365435ed24ef6c79cbee48 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Thu, 2 Dec 2021 00:52:12 +0200
Subject: [PATCH] Kernel: Implement the SO_ACCEPTCONN SOL_SOCKET-level option

---
 Kernel/API/POSIX/sys/socket.h | 2 ++
 Kernel/Net/Socket.cpp         | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/Kernel/API/POSIX/sys/socket.h b/Kernel/API/POSIX/sys/socket.h
index ce0efe8a58..c32dc92c34 100644
--- a/Kernel/API/POSIX/sys/socket.h
+++ b/Kernel/API/POSIX/sys/socket.h
@@ -108,6 +108,7 @@ enum {
     SO_TIMESTAMP,
     SO_BROADCAST,
     SO_LINGER,
+    SO_ACCEPTCONN,
 };
 #define SO_RCVTIMEO SO_RCVTIMEO
 #define SO_SNDTIMEO SO_SNDTIMEO
@@ -123,6 +124,7 @@ enum {
 #define SO_SNDBUF SO_SNDBUF
 #define SO_RCVBUF SO_RCVBUF
 #define SO_LINGER SO_LINGER
+#define SO_ACCEPTCONN SO_ACCEPTCONN
 
 enum {
     SCM_TIMESTAMP,
diff --git a/Kernel/Net/Socket.cpp b/Kernel/Net/Socket.cpp
index 6b0f753ca1..da99bfd724 100644
--- a/Kernel/Net/Socket.cpp
+++ b/Kernel/Net/Socket.cpp
@@ -208,6 +208,14 @@ ErrorOr<void> Socket::getsockopt(OpenFileDescription&, int level, int option, Us
         TRY(memset_user(value.unsafe_userspace_ptr(), 0, sizeof(int)));
         size = sizeof(int);
         return copy_to_user(value_size, &size);
+    case SO_ACCEPTCONN: {
+        int accepting_connections = (m_role == Role::Listener) ? 1 : 0;
+        if (size < sizeof(accepting_connections))
+            return EINVAL;
+        TRY(copy_to_user(static_ptr_cast<int*>(value), &accepting_connections));
+        size = sizeof(accepting_connections);
+        return copy_to_user(value_size, &size);
+    }
     default:
         dbgln("setsockopt({}) at SOL_SOCKET not implemented.", option);
         return ENOPROTOOPT;