add loop

io/iob_send.c

@@ -24,9 +24,10 @@ int64 iob_send(int64 s,io_batch* b) {
 
   if (b->bytesleft==0) return 0;
   last=array_start(&b->b)+array_bytes(&b->b);
+  v=alloca(b->bufs*sizeof(struct iovec));
+  for (;;) {
     if (!(e=array_get(&b->b,sizeof(io_entry),b->next)))
       return -1;		/* can't happen error */
-  v=alloca(b->bufs*sizeof(struct iovec));
 #ifdef BSD_SENDFILE
     /* BSD sendfile can send headers and trailers.  If we run on BSD, we
     * should try to exploit this. */
@@ -66,20 +67,24 @@ int64 iob_send(int64 s,io_batch* b) {
     else
       sent=io_sendfile(s,e->fd,e->offset,e->n);
 #endif
-  if (sent==b->bytesleft)
+    if (sent==b->bytesleft) {
       b->bytesleft=0;
-  else if (sent>0) {
+      break;
+    } else if (sent>0) {
       int64 rest=sent;
       b->bytesleft-=rest;
       for (i=0; e+i<last; ++i) {
-      if (e[i].n-e[i].offset<rest) {
+	if (e[i].n-e[i].offset<=rest) {
 	  rest-=e[i].n-e[i].offset;
 	  ++b->next;
+	  if (!rest) break;
 	} else {
 	  e[i].offset+=rest;
-	break;
+	  goto abort;
 	}
       }
+    } else break;
   }
+abort:
   return sent;
 }