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Add symbolic names for standard file descriptors #21

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Merged
merged 1 commit into from
Feb 6, 2021
Merged

Add symbolic names for standard file descriptors #21

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17 changes: 16 additions & 1 deletion Sources/System/FileDescriptor.swift
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
/*
This source file is part of the Swift System open source project

Copyright (c) 2020 Apple Inc. and the Swift System project authors
Copyright (c) 2020 - 2021 Apple Inc. and the Swift System project authors
Licensed under Apache License v2.0 with Runtime Library Exception

See https://swift.org/LICENSE.txt for license information
Expand All @@ -25,6 +25,21 @@ public struct FileDescriptor: RawRepresentable, Hashable, Codable {
public init(rawValue: CInt) { self.rawValue = rawValue }
}

// Standard file descriptors
extension FileDescriptor {
/// The standard input file descriptor, with a numeric value of 0.
@_alwaysEmitIntoClient
public static var standardInput: FileDescriptor { .init(rawValue: 0) }

/// The standard output file descriptor, with a numeric value of 1.
@_alwaysEmitIntoClient
public static var standardOutput: FileDescriptor { .init(rawValue: 1) }

/// The standard error file descriptor, with a numeric value of 2.
@_alwaysEmitIntoClient
public static var standardError: FileDescriptor { .init(rawValue: 2) }
}

// @available(macOS 10.16, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
extension FileDescriptor {
/// The desired read and write access for a newly opened file.
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8 changes: 7 additions & 1 deletion Tests/SystemTests/FileTypesTest.swift
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
/*
This source file is part of the Swift System open source project

Copyright (c) 2020 Apple Inc. and the Swift System project authors
Copyright (c) 2020 - 2021 Apple Inc. and the Swift System project authors
Licensed under Apache License v2.0 with Runtime Library Exception

See https://swift.org/LICENSE.txt for license information
Expand All @@ -12,6 +12,12 @@ import SystemPackage

// @available(macOS 10.16, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
final class FileDescriptorTest: XCTestCase {
func testStandardDescriptors() {
XCTAssertEqual(FileDescriptor.standardInput.rawValue, 0)
XCTAssertEqual(FileDescriptor.standardOutput.rawValue, 1)
XCTAssertEqual(FileDescriptor.standardError.rawValue, 2)
}

// Test the constants match the C header values. For various reasons,
func testConstants() {
XCTAssertEqual(O_RDONLY, FileDescriptor.AccessMode.readOnly.rawValue)
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