Address ambiguous usage of open(2) constants.

Author: niw

Sources/Foundation/NSData.swift

@@ -464,8 +464,10 @@ open class NSData : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
             // and the compiler will throw an error.
 #if os(Windows)
             let createMode = Int(ucrt.S_IREAD) | Int(ucrt.S_IWRITE)
-#else
+#elseif canImport(Darwin)
             let createMode = Int(S_IRUSR) | Int(S_IWUSR) | Int(S_IRGRP) | Int(S_IWGRP) | Int(S_IROTH) | Int(S_IWOTH)
+#else
+            let createMode = Int(Glibc.S_IRUSR) | Int(Glibc.S_IWUSR) | Int(Glibc.S_IRGRP) | Int(Glibc.S_IWGRP) | Int(Glibc.S_IROTH) | Int(Glibc.S_IWOTH)
 #endif
             guard let fh = FileHandle(path: path, flags: flags, createMode: createMode) else {
                 throw _NSErrorWithErrno(errno, reading: false, path: path)

Tests/Foundation/Tests/TestNSData.swift

@@ -581,7 +581,12 @@ class TestNSData: LoopbackServerTest {
                 try data.write(to: url)
                 let fileManager = FileManager.default
                 let permission = try fileManager._permissionsOfItem(atPath: url.path)
-                XCTAssertEqual(0o666, permission)
+#if canImport(Darwin)
+                let expected = Int(S_IRUSR) | Int(S_IWUSR) | Int(S_IRGRP) | Int(S_IWGRP) | Int(S_IROTH) | Int(S_IWOTH)
+#else
+                let expected = Int(Glibc.S_IRUSR) | Int(Glibc.S_IWUSR) | Int(Glibc.S_IRGRP) | Int(Glibc.S_IWGRP) | Int(Glibc.S_IROTH) | Int(Glibc.S_IWOTH)
+#endif
+                XCTAssertEqual(permission, expected)
                 try! fileManager.removeItem(atPath: url.path)
             } catch {
                 XCTFail()
@@ -599,7 +604,12 @@ class TestNSData: LoopbackServerTest {
                 try data.write(to: url, options: .atomic)
                 let fileManager = FileManager.default
                 let permission = try fileManager._permissionsOfItem(atPath: url.path)
-                XCTAssertEqual(0o666, permission)
+#if canImport(Darwin)
+                let expected = Int(S_IRUSR) | Int(S_IWUSR) | Int(S_IRGRP) | Int(S_IWGRP) | Int(S_IROTH) | Int(S_IWOTH)
+#else
+                let expected = Int(Glibc.S_IRUSR) | Int(Glibc.S_IWUSR) | Int(Glibc.S_IRGRP) | Int(Glibc.S_IWGRP) | Int(Glibc.S_IROTH) | Int(Glibc.S_IWOTH)
+#endif
+                XCTAssertEqual(permission, expected)
                 try! fileManager.removeItem(atPath: url.path)
             } catch {
                 XCTFail()