Support memoryview in os.write()

Author: otethal

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/PosixModuleBuiltins.java

@@ -161,6 +161,7 @@
 import com.oracle.truffle.api.dsl.Specialization;
 import com.oracle.truffle.api.dsl.TypeSystemReference;
 import com.oracle.truffle.api.frame.VirtualFrame;
+import com.oracle.truffle.api.interop.UnsupportedMessageException;
 import com.oracle.truffle.api.library.CachedLibrary;
 import com.oracle.truffle.api.profiles.BranchProfile;
 import com.oracle.truffle.api.profiles.ConditionProfile;
@@ -1202,6 +1203,21 @@ Object write(VirtualFrame frame, int fd, PBytesLike data,
             return write(frame, fd, getByteArray(data.getSequenceStorage()), channelClassProfile);
         }
 
+        @Specialization(limit = "getCallSiteInlineCacheMaxDepth()")
+        Object write(VirtualFrame frame, int fd, Object data,
+                        @CachedLibrary("data") PythonObjectLibrary lib,
+                        @Cached("createClassProfile()") ValueProfile channelClassProfile) {
+            if (lib.isBuffer(data)) {
+                try {
+                    byte[] b = lib.getBufferBytes(data);
+                    return write(frame, fd, b, channelClassProfile);
+                } catch (UnsupportedMessageException e) {
+                    throw CompilerDirectives.shouldNotReachHere("Buffer-like object does not support getBufferBytes()");
+                }
+            }
+            throw raise(TypeError, ErrorMessages.BYTESLIKE_OBJ_REQUIRED, data);
+        }
+
         @Specialization(limit = "getCallSiteInlineCacheMaxDepth()")
         static Object writePInt(VirtualFrame frame, Object fd, Object data,
                         @CachedLibrary("fd") PythonObjectLibrary lib,