Configure process now checks availability of recvfrom() socket function and

finds out its return type and the types of its arguments. Added definitions
for non-configure systems config files, and introduced macro sreadfrom which
will be used on udp sockets as a recvfrom() wrapper.

setup_once.h

@@ -3,7 +3,7 @@
 
 /* $Id$ */
 
-/* Copyright (C) 2004 - 2007 by Daniel Stenberg et al
+/* Copyright (C) 2004 - 2008 by Daniel Stenberg et al
  *
  * Permission to use, copy, modify, and distribute this software and its
  * documentation for any purpose and without fee is hereby granted, provided
@@ -191,6 +191,37 @@ struct timeval {
 #endif /* HAVE_SEND */
 
 
+#if defined(HAVE_RECVFROM)
+/*
+ * Currently recvfrom is only used on udp sockets.
+ */
+#if !defined(RECVFROM_TYPE_ARG1) || \
+    !defined(RECVFROM_TYPE_ARG2) || \
+    !defined(RECVFROM_TYPE_ARG3) || \
+    !defined(RECVFROM_TYPE_ARG4) || \
+    !defined(RECVFROM_TYPE_ARG5) || \
+    !defined(RECVFROM_TYPE_ARG6) || \
+    !defined(RECVFROM_TYPE_RETV)
+  /* */
+  Error Missing_definition_of_return_and_arguments_types_of_recvfrom
+  /* */
+#else
+#define sreadfrom(s,b,bl,f,fl) (ssize_t)recvfrom((RECVFROM_TYPE_ARG1)(s),  \
+                                                 (RECVFROM_TYPE_ARG2)(b),  \
+                                                 (RECVFROM_TYPE_ARG3)(bl), \
+                                                 (RECVFROM_TYPE_ARG4)(0),  \
+                                                 (RECVFROM_TYPE_ARG5)(f),  \
+                                                 (RECVFROM_TYPE_ARG6)(fl))
+#endif
+#else /* HAVE_RECVFROM */
+#ifndef sreadfrom
+  /* */
+  Error Missing_definition_of_macro_sreadfrom
+  /* */
+#endif
+#endif /* HAVE_RECVFROM */
+
+
 /*
  * Uppercase macro versions of ANSI/ISO is*() functions/macros which
  * avoid negative number inputs with argument byte codes > 127.