Added Tor

ports/glibc-compat/src/readv.c

+/* Copyright 2015 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+#include <sys/uio.h>
+#include <unistd.h> // unix(nacl) standards
+#include <errno.h>
+
+ssize_t readv (int fd, const struct iovec *iov, int iovcnt) {
+  if (iovcnt < 0) {
+    // #TODO(dt) add check for IOV_MAX
+    errno = EINVAL;
+    return -1;
+  }
+  ssize_t bytes_read = 0;
+  ssize_t bytes_supposed_to_be_read = 0;
+  int i;
+  for (i = 0; i < (iovcnt); i++) {
+    bytes_read += read(fd, iov[i].iov_base, iov[i].iov_len);
+    bytes_supposed_to_be_read += iov[i].iov_len;
+    //#TODO(dt) add check for (max) ssize_t allowed
+    if (bytes_read != bytes_supposed_to_be_read) {
+      // deliberately not setting errno here as it might override
+      // errno set by read(...)
+      return -1;
+    }
+  }
+  return bytes_read;
+}