Merge pull request ffi#662 from IgorJorobus/master

Added specs for FFI::LastError.winapi_error()

spec/ffi/errno_spec.rb

@@ -10,11 +10,28 @@ module LibTest
     extend FFI::Library
     ffi_lib TestLibrary::PATH
     attach_function :setLastError, [ :int ], :void
+    attach_function :setErrno, [ :int ], :void
   end
 
-  it "FFI.errno contains errno from last function" do
+  it "FFI.errno contains errno from last function, FFI::LastError.winapi_error works differently per OS" do
+    # setup
+    LibTest.setErrno(0)
     LibTest.setLastError(0)
     LibTest.setLastError(0x12345678)
-    expect(FFI.errno).to eq(0x12345678)
+    # cases
+    case FFI::Platform::OS
+      when "cygwin"
+        expect(FFI::LastError.winapi_error).to eq(0x12345678)
+        LibTest.setErrno(0x2A)
+        expect(FFI.errno).to eq(0x2A)
+      when "windows"
+        expect(FFI::LastError.winapi_error).to eq(0x12345678)
+        expect(FFI.errno).to eq(0x12345678)
+      else
+        # Linux, and else
+        expect {FFI::LastError.winapi_error}.to raise_exception(NoMethodError)
+        expect {FFI::LastError.winapi_error = 0}.to raise_exception(NoMethodError)
+        expect(FFI.errno).to eq(0x12345678)
+    end
   end
 end

spec/ffi/fixtures/LastErrorTest.c

@@ -10,12 +10,14 @@
 # include <errno.h>
 #endif
 
-int setLastError(int error) {
-#if defined(_WIN32) || defined(__WIN32__)
+void setLastError(int error) {
+#if defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
     SetLastError(error);
 #else
     errno = error;
 #endif
-    return -1;
 }
 
+void setErrno(int error) {
+  errno = error;
+}

spec/ffi/fixtures/classes.rb

@@ -111,6 +111,7 @@ module TestEnum3
   #
   module LibTest
     attach_function :setLastError, [ :int ], :void
+    attach_function :setErrno, [ :int ], :void
   end
 
   #