Have FileHandle.nullDevice return a subclass which does nothing.
diff --git a/Foundation/NSFileHandle.swift b/Foundation/NSFileHandle.swift
index c35bc29..dcc3e5d 100755
--- a/Foundation/NSFileHandle.swift
+++ b/Foundation/NSFileHandle.swift
@@ -216,7 +216,41 @@
}
internal static var _nulldeviceFileHandle: FileHandle = {
- return FileHandle(forUpdatingAtPath: "/dev/null")!
+ class NullDevice: FileHandle {
+ override var availableData: Data {
+ return Data()
+ }
+
+ override func readDataToEndOfFile() -> Data {
+ return Data()
+ }
+
+ override func readData(ofLength length: Int) -> Data {
+ return Data()
+ }
+
+ override func write(_ data: Data) {}
+
+ override var offsetInFile: UInt64 {
+ return 0
+ }
+
+ override func seekToEndOfFile() -> UInt64 {
+ return 0
+ }
+
+ override func seek(toFileOffset offset: UInt64) {}
+
+ override func truncateFile(atOffset offset: UInt64) {}
+
+ override func synchronizeFile() {}
+
+ override func closeFile() {}
+
+ deinit {}
+ }
+
+ return NullDevice(fileDescriptor: -1, closeOnDealloc: false)
}()
open class var nullDevice: FileHandle {
diff --git a/TestFoundation/TestNSFileHandle.swift b/TestFoundation/TestNSFileHandle.swift
index 42b1556..93357ff 100755
--- a/TestFoundation/TestNSFileHandle.swift
+++ b/TestFoundation/TestNSFileHandle.swift
@@ -43,8 +43,18 @@
func test_nullDevice() {
let fh = FileHandle.nullDevice
+ XCTAssertEqual(fh.fileDescriptor, -1)
+ fh.closeFile()
+ fh.seek(toFileOffset: 10)
+ XCTAssertEqual(fh.offsetInFile, 0)
+ XCTAssertEqual(fh.seekToEndOfFile(), 0)
+ XCTAssertEqual(fh.readData(ofLength: 15).count, 0)
+ fh.synchronizeFile()
+
fh.write(Data(bytes: [1,2]))
+ fh.seek(toFileOffset: 0)
XCTAssertEqual(fh.availableData.count, 0)
+ fh.write(Data(bytes: [1,2]))
fh.seek(toFileOffset: 0)
XCTAssertEqual(fh.readDataToEndOfFile().count, 0)
}
