Hmm - Jim - that does not quite solve the issue I was discussing on  
IRC; I think below is needed (which does solve the TimeOut issue).

--> diff with your version -- anticipate nbytes set to 0 (which has  
whole file semantics on BSD and Darwin).

Does that make sense ?

Dw

Index: network_io/unix/sendrecv.c
===================================================================
--- network_io/unix/sendrecv.c	(revision 648693)
+++ network_io/unix/sendrecv.c	(working copy)
@@ -438,6 +438,7 @@
              }
          }
          if (nbytes) {
+	    int nnbytes = nbytes;
              /* We won't dare call sendfile() if we don't have
               * header or file bytes to send because nbytes == 0
               * means send the remaining file to EOF.
@@ -445,7 +446,7 @@
              rv = sendfile(file->filedes, /* file to be sent */
                            sock->socketdes, /* socket */
                            *offset,       /* where in the file to  
start */
-                          &nbytes,       /* number of bytes to write/ 
written */
+                          &nnbytes,       /* number of bytes to write/ 
written */
                            &headerstruct, /* Headers/footers */
                            flags);        /* undefined, set to 0 */

@@ -453,12 +454,13 @@
                  if (errno == EAGAIN) {
                      if (sock->timeout > 0) {
                          sock->options |= APR_INCOMPLETE_WRITE;
+			rv = 0;
                      }
                      /* BSD's sendfile can return -1/EAGAIN even if it
                       * sent bytes.  Sanitize the result so we get  
normal EAGAIN
                       * semantics w.r.t. bytes sent.
                       */
-                    if (nbytes) {
+                    if (nnbytes) {
                          /* normal exit for a big file & non-blocking  
io */
                          (*len) = nbytes;
                          return APR_SUCCESS;
@@ -466,7 +468,7 @@
                  }
              }
              else {       /* rv == 0 (or the kernel is broken) */
-                if (nbytes == 0) {
+                if (nnbytes == 0) {
                      /* Most likely the file got smaller after the  
stat.
                       * Return an error so the caller can do the  
Right Thing.
                       */