Test readx/writex (now renamed).

Renamed readx/writex to ReadFdExactly/WriteFdExactly respectively.
These read/write a full fixed-size buffer. If the whole buffer cannot
be read/written, these functions return an error.

Rename write_string to WriteStringFully.

Move the TEMP_FAILURE_RETRY definition in sysdeps.h out of the
!Windows section. It seems Windows won't actually interrupt a call,
but it's easier to just define it than to #ifdef each call.

Change-Id: Ia8ddffa2a52764a2f9a281c96c937660e002b9b9
diff --git a/adb/transport.h b/adb/transport.h
index 9802b91..352bbe4 100644
--- a/adb/transport.h
+++ b/adb/transport.h
@@ -17,6 +17,7 @@
 #ifndef __TRANSPORT_H
 #define __TRANSPORT_H
 
+#include <stdbool.h>
 #include <sys/types.h>
 
 #include "adb.h"
@@ -25,13 +26,9 @@
 extern "C" {
 #endif
 
-/*
- * Convenience wrappers around read/write that will retry on
- * EINTR and/or short read/write.  Returns 0 on success, -1
- * on error or EOF.
- */
-int readx(int fd, void *ptr, size_t len);
-int writex(int fd, const void *ptr, size_t len);
+#if ADB_TRACE
+void dump_hex(const unsigned char* ptr, size_t  len);
+#endif
 
 /*
  * Obtain a transport from the available transports.