From cd19c306f6374cc1802d6a912dd010731ec503b5 Mon Sep 17 00:00:00 2001
From: Kim Topley <ktopley@apple.com>
Date: Fri, 17 Mar 2017 14:00:06 -0700
Subject: [PATCH] Makes the DispatchIO initializer that accepts a path
 failable, reflecting the fact that a relative or non-existent path is
 invalid.

(Radar 31115994)
---
 src/swift/IO.swift | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/swift/IO.swift b/src/swift/IO.swift
index 8ce417aa7..d26f64160 100644
--- a/src/swift/IO.swift
+++ b/src/swift/IO.swift
@@ -55,6 +55,7 @@ public extension DispatchIO {
 		self.init(__type: type.rawValue, fd: fileDescriptor, queue: queue, handler: cleanupHandler)
 	}
 
+	@available(swift, obsoleted: 4)
 	public convenience init(
 		type: StreamType,
 		path: UnsafePointer<Int8>,
@@ -66,6 +67,18 @@ public extension DispatchIO {
 		self.init(__type: type.rawValue, path: path, oflag: oflag, mode: mode, queue: queue, handler: cleanupHandler)
 	}
 
+	@available(swift, introduced: 4)
+	public convenience init?(
+		type: StreamType,
+		path: UnsafePointer<Int8>,
+		oflag: Int32,
+		mode: mode_t,
+		queue: DispatchQueue,
+		cleanupHandler: @escaping (_ error: Int32) -> Void)
+	{
+		self.init(__type: type.rawValue, path: path, oflag: oflag, mode: mode, queue: queue, handler: cleanupHandler)
+	}
+
 	public convenience init(
 		type: StreamType,
 		io: DispatchIO,