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/sysdeps.h b/adb/sysdeps.h
index ec847b5..c317e3a 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -24,6 +24,21 @@
 #  undef _WIN32
 #endif
 
+/*
+ * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
+ * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
+ * not already defined, then define it here.
+ */
+#ifndef TEMP_FAILURE_RETRY
+/* Used to retry syscalls that can return EINTR. */
+#define TEMP_FAILURE_RETRY(exp) ({         \
+    typeof (exp) _rc;                      \
+    do {                                   \
+        _rc = (exp);                       \
+    } while (_rc == -1 && errno == EINTR); \
+    _rc; })
+#endif
+
 #ifdef _WIN32
 
 #include <ctype.h>
@@ -264,10 +279,6 @@
 
 extern char*  adb_strtok_r(char *str, const char *delim, char **saveptr);
 
-#ifdef __cplusplus
-}
-#endif
-
 #else /* !_WIN32 a.k.a. Unix */
 
 #include "fdevent.h"
@@ -291,21 +302,6 @@
 extern "C" {
 #endif
 
-/*
- * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
- * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
- * not already defined, then define it here.
- */
-#ifndef TEMP_FAILURE_RETRY
-/* Used to retry syscalls that can return EINTR. */
-#define TEMP_FAILURE_RETRY(exp) ({         \
-    typeof (exp) _rc;                      \
-    do {                                   \
-        _rc = (exp);                       \
-    } while (_rc == -1 && errno == EINTR); \
-    _rc; })
-#endif
-
 #define OS_PATH_SEPARATOR '/'
 #define OS_PATH_SEPARATOR_STR "/"
 #define ENV_PATH_SEPARATOR_STR ":"