Add support for WASILibc module

Sources/CSystem/include/CSystemWASI.h

@@ -0,0 +1,31 @@
+/*
+ This source file is part of the Swift System open source project
+
+ Copyright (c) 2024 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
+*/
+
+#pragma once
+
+#if __wasi__
+
+#include <errno.h>
+#include <fcntl.h>
+
+// wasi-libc defines the following constants in a way that Clang Importer can't
+// understand, so we need to expose them manually.
+static inline int32_t _getConst_O_ACCMODE(void) { return O_ACCMODE; }
+static inline int32_t _getConst_O_APPEND(void) { return O_APPEND; }
+static inline int32_t _getConst_O_CREAT(void) { return O_CREAT; }
+static inline int32_t _getConst_O_DIRECTORY(void) { return O_DIRECTORY; }
+static inline int32_t _getConst_O_EXCL(void) { return O_EXCL; }
+static inline int32_t _getConst_O_NONBLOCK(void) { return O_NONBLOCK; }
+static inline int32_t _getConst_O_TRUNC(void) { return O_TRUNC; }
+static inline int32_t _getConst_O_WRONLY(void) { return O_WRONLY; }
+
+static inline int32_t _getConst_EWOULDBLOCK(void) { return EWOULDBLOCK; }
+static inline int32_t _getConst_EOPNOTSUPP(void) { return EOPNOTSUPP; }
+
+#endif

Sources/CSystem/include/module.modulemap

@@ -1,5 +1,6 @@
 module CSystem {
   header "CSystemLinux.h"
+  header "CSystemWASI.h"
   header "CSystemWindows.h"
   export *
 }

Sources/System/Errno.swift

@@ -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) 2021 - 2024 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
@@ -229,7 +229,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "badAddress")
   public static var EFAULT: Errno { badAddress }
 
-#if !os(Windows)
+#if !os(Windows) && !os(WASI)
   /// Not a block device.
   ///
   /// You attempted a block device operation on a nonblock device or file.
@@ -621,6 +621,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "protocolNotSupported")
   public static var EPROTONOSUPPORT: Errno { protocolNotSupported }
 
+#if !os(WASI)
   /// Socket type not supported.
   ///
   /// Support for the socket type hasn't been configured into the system
@@ -633,6 +634,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "socketTypeNotSupported")
   public static var ESOCKTNOSUPPORT: Errno { socketTypeNotSupported }
+#endif
 
   /// Not supported.
   ///
@@ -647,6 +649,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "notSupported")
   public static var ENOTSUP: Errno { notSupported }
 
+#if !os(WASI)
   /// Protocol family not supported.
   ///
   /// The protocol family hasn't been configured into the system
@@ -659,6 +662,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "protocolFamilyNotSupported")
   public static var EPFNOSUPPORT: Errno { protocolFamilyNotSupported }
+#endif
 
   /// The address family isn't supported by the protocol family.
   ///
@@ -805,6 +809,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "socketNotConnected")
   public static var ENOTCONN: Errno { socketNotConnected }
 
+#if !os(WASI)
   /// Can't send after socket shutdown.
   ///
   /// A request to send data wasn't permitted
@@ -818,6 +823,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "socketShutdown")
   public static var ESHUTDOWN: Errno { socketShutdown }
+#endif
 
   /// Operation timed out.
   ///
@@ -874,6 +880,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "fileNameTooLong")
   public static var ENAMETOOLONG: Errno { fileNameTooLong }
 
+#if !os(WASI)
   /// The host is down.
   ///
   /// A socket operation failed because the destination host was down.
@@ -885,6 +892,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "hostIsDown")
   public static var EHOSTDOWN: Errno { hostIsDown }
+#endif
 
   /// No route to host.
   ///
@@ -923,6 +931,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   public static var EPROCLIM: Errno { tooManyProcesses }
 #endif
 
+#if !os(WASI)
   /// Too many users.
   ///
   /// The quota system ran out of table entries.
@@ -934,6 +943,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "tooManyUsers")
   public static var EUSERS: Errno { tooManyUsers }
+#endif
 
   /// Disk quota exceeded.
   ///
@@ -1287,6 +1297,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "multiHop")
   public static var EMULTIHOP: Errno { multiHop }
 
+#if !os(WASI)
   /// No message available.
   ///
   /// No message was available to be received by the requested operation.
@@ -1298,6 +1309,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "noData")
   public static var ENODATA: Errno { noData }
+#endif
 
   /// Reserved.
   ///
@@ -1311,6 +1323,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "noLink")
   public static var ENOLINK: Errno { noLink }
 
+#if !os(WASI)
   /// Reserved.
   ///
   /// This error is reserved for future use.
@@ -1334,6 +1347,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "notStream")
   public static var ENOSTR: Errno { notStream }
+#endif
 #endif
 
   /// Protocol error.
@@ -1350,7 +1364,7 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
   @available(*, unavailable, renamed: "protocolError")
   public static var EPROTO: Errno { protocolError }
 
-#if !os(OpenBSD)
+#if !os(OpenBSD) && !os(WASI)
   /// Reserved.
   ///
   /// This error is reserved for future use.
@@ -1382,7 +1396,6 @@ public struct Errno: RawRepresentable, Error, Hashable, Codable {
 // Constants defined in header but not man page
 @available(/*System 0.0.1: macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0*/iOS 8, *)
 extension Errno {
-
   /// Operation would block.
   ///
   /// The corresponding C error is `EWOULDBLOCK`.
@@ -1393,6 +1406,7 @@ extension Errno {
   @available(*, unavailable, renamed: "wouldBlock")
   public static var EWOULDBLOCK: Errno { wouldBlock }
 
+#if !os(WASI)
   /// Too many references: can't splice.
   ///
   /// The corresponding C error is `ETOOMANYREFS`.
@@ -1412,6 +1426,7 @@ extension Errno {
   @_alwaysEmitIntoClient
   @available(*, unavailable, renamed: "tooManyRemoteLevels")
   public static var EREMOTE: Errno { tooManyRemoteLevels }
+#endif
 
 #if SYSTEM_PACKAGE_DARWIN
   /// No such policy registered.

Sources/System/FileOperations.swift

@@ -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 - 2024 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
@@ -369,6 +369,7 @@ extension FileDescriptor {
   }
 }
 
+#if !os(WASI)
 @available(/*System 0.0.2: macOS 12.0, iOS 15.0, watchOS 8.0, tvOS 15.0*/iOS 8, *)
 extension FileDescriptor {
   /// Duplicates this file descriptor and return the newly created copy.
@@ -433,8 +434,9 @@ extension FileDescriptor {
     fatalError("Not implemented")
   }
 }
+#endif
 
-#if !os(Windows)
+#if !os(Windows) && !os(WASI)
 @available(/*System 1.1.0: macOS 12.3, iOS 15.4, watchOS 8.5, tvOS 15.4*/iOS 8, *)
 extension FileDescriptor {
   /// Creates a unidirectional data channel, which can be used for interprocess communication.

Sources/System/Internals/CInterop.swift

@@ -1,7 +1,7 @@
 /*
  This source file is part of the Swift System open source project
 
- Copyright (c) 2020 - 2021 Apple Inc. and the Swift System project authors
+ Copyright (c) 2020 - 2024 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
@@ -18,6 +18,8 @@ import Glibc
 #elseif canImport(Musl)
 @_implementationOnly import CSystem
 import Musl
+#elseif canImport(WASILibc)
+import WASILibc
 #else
 #error("Unsupported Platform")
 #endif