auto import from //depot/cupcake/@135843
diff --git a/libcutils/uio.c b/libcutils/uio.c
new file mode 100644
index 0000000..baa8051
--- /dev/null
+++ b/libcutils/uio.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef HAVE_SYS_UIO_H
+
+#include <cutils/uio.h>
+#include <unistd.h>
+
+int readv( int fd, struct iovec* vecs, int count )
+{
+ int total = 0;
+
+ for ( ; count > 0; count--, vecs++ ) {
+ const char* buf = vecs->iov_base;
+ int len = vecs->iov_len;
+
+ while (len > 0) {
+ int ret = read( fd, buf, len );
+ if (ret < 0) {
+ if (total == 0)
+ total = -1;
+ goto Exit;
+ }
+ if (ret == 0)
+ goto Exit;
+
+ total += ret;
+ buf += ret;
+ len -= ret;
+ }
+ }
+Exit:
+ return total;
+}
+
+int writev( int fd, const struct iovec* vecs, int count )
+{
+ int total = 0;
+
+ for ( ; count > 0; count--, vecs++ ) {
+ const char* buf = (const char*)vecs->iov_base;
+ int len = (int)vecs->iov_len;
+
+ while (len > 0) {
+ int ret = write( fd, buf, len );
+ if (ret < 0) {
+ if (total == 0)
+ total = -1;
+ goto Exit;
+ }
+ if (ret == 0)
+ goto Exit;
+
+ total += ret;
+ buf += ret;
+ len -= ret;
+ }
+ }
+Exit:
+ return total;
+}
+
+#endif /* !HAVE_SYS_UIO_H */