From a77d29ab37ef33275660f5928e27d58b4b4f323b Mon Sep 17 00:00:00 2001
From: Robin Goos <mail@robingoos.com>
Date: Thu, 26 Jan 2023 17:55:44 -0800
Subject: [PATCH] Avoid closing sockets twice

---
 Sources/TCPSocket.swift | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Sources/TCPSocket.swift b/Sources/TCPSocket.swift
index 35a10dc..7a02492 100644
--- a/Sources/TCPSocket.swift
+++ b/Sources/TCPSocket.swift
@@ -201,8 +201,12 @@ public final class TCPSocket {
 
     /// Close the socket
     func close() {
+        guard fileDescriptor != -1 else {
+            return
+        }
         _ = SystemLibrary.shutdown(fileDescriptor, Int32(SHUT_WR))
         _ = SystemLibrary.close(fileDescriptor)
+        fileDescriptor = -1
     }
 
     func getPeerName() throws -> (String, Int) {