[stdlib] Include POSIXError as part of MSVCRT

stdlib/public/Platform/CMakeLists.txt

@@ -39,6 +39,7 @@ add_swift_target_library(swiftGlibc ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_SDK_O
 add_swift_target_library(swiftMSVCRT ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_SDK_OVERLAY
     msvcrt.swift
     ${swift_platform_sources}
+    POSIXError.swift
 
     GYB_SOURCES
       ${swift_platform_gyb_sources}

stdlib/public/Platform/POSIXError.swift

@@ -10,8 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// FIXME: Only defining POSIXErrorCode for Darwin and Linux at the moment.
-
 #if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
 
 /// Enumeration describing POSIX error codes.
@@ -554,4 +552,130 @@ public enum POSIXErrorCode : Int32 {
   case ENOTRECOVERABLE = 131
 }
 
+#elseif os(Windows)
+
+/// Enumeration describing POSIX error codes.
+public enum POSIXErrorCode : Int32 {
+
+    /// Operation not permitted
+    case EPERM          = 1
+
+    /// No such file or directory
+    case ENOENT         = 2
+
+    /// No such process
+    case ESRCH          = 3
+
+    /// Interrupted function
+    case EINTR          = 4
+
+    /// I/O error
+    case EIO            = 5
+
+    /// No such device or address
+    case ENXIO          = 6
+
+    /// Argument list too long
+    case E2BIG          = 7
+
+    /// Exec format error
+    case ENOEXEC        = 8
+
+    /// Bad file number
+    case EBADF          = 9
+
+    /// No spawned processes
+    case ECHILD         = 10
+
+    /// No more processes or not enough memory or maximum nesting level reached
+    case EAGAIN         = 11
+
+    /// Not enough memory
+    case ENOMEM         = 12
+
+    /// Permission denied
+    case EACCES         = 13
+
+    /// Bad address
+    case EFAULT         = 14
+
+    /// Device or resource busy
+    case EBUSY          = 16
+
+    /// File exists
+    case EEXIST         = 17
+
+    /// Cross-device link
+    case EXDEV          = 18
+
+    /// No such device
+    case ENODEV         = 19
+
+    /// Not a directory
+    case ENOTDIR        = 20
+
+    /// Is a directory
+    case EISDIR         = 21
+
+    /// Invalid argument
+    case EINVAL         = 22
+
+    /// Too many files open in system
+    case ENFILE         = 23
+
+    /// Too many open files
+    case EMFILE         = 24
+
+    /// Inappropriate I/O control operation
+    case ENOTTY         = 25
+
+    /// File too large
+    case EFBIG          = 27
+
+    /// No space left on device
+    case ENOSPC         = 28
+
+    /// Invalid seek
+    case ESPIPE         = 29
+
+    /// Read-only file system
+    case EROFS          = 30
+
+    /// Too many links
+    case EMLINK         = 31
+
+    /// Broken pipe
+    case EPIPE          = 32
+
+    /// Math argument
+    case EDOM           = 33
+
+    /// Result too large
+    case ERANGE         = 34
+
+    /// Resource deadlock would occur
+    case EDEADLK        = 36
+
+    /// Same as EDEADLK for compatibility with older Microsoft C versions
+    public static var EDEADLOCK: POSIXErrorCode { return .EDEADLK }
+
+    /// Filename too long
+    case ENAMETOOLONG   = 38
+
+    /// No locks available
+    case ENOLCK         = 39
+
+    /// Function not supported
+    case ENOSYS         = 40
+
+    /// Directory not empty
+    case ENOTEMPTY      = 41
+
+    /// Illegal byte sequence
+    case EILSEQ         = 42
+
+    /// String was truncated
+    case STRUNCATE      = 80
+}
+
 #endif