Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which shouldn't be a problem if we register signal handlers with sigaction(SA_RESTART) Straighten out count and len (I generally consistently use "count" for the current progress and "len" for the total, but this time I got them backwards for some reason and don't want to confuse myself in future.)

--- a/lib/portability.h	Thu Jan 18 18:16:11 2007 -0500
+++ b/lib/portability.h	Thu Jan 18 21:54:08 2007 -0500
@@ -1,3 +1,9 @@
+
+// Humor glibc to get dprintf, then #define it to something more portable.
+#define _GNU_SOURCE
+#include <stdio.h>
+#define fdprintf(...) dprintf(__VA_ARGS__)
+
 #include <endian.h>
 
 #if __BYTE_ORDER == __BIG_ENDIAN