# HG changeset patch
# User Igor Sysoev <igor@sysoev.ru>
# Date 1253027523 0
# Node ID 47b7b6ac433e8a768dbfb9c1aff7a1289d80e743
# Parent  7841263700926691328d8c47a0c03a5a5c583269
do not pass buf with empty cached response,
this fixes "zero size buf in output" alert

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -767,6 +767,7 @@ ngx_http_file_cache_update(ngx_http_requ
 ngx_int_t
 ngx_http_cache_send(ngx_http_request_t *r)
 {
+    off_t              size;
     ngx_int_t          rc;
     ngx_buf_t         *b;
     ngx_chain_t        out;
@@ -795,10 +796,15 @@ ngx_http_cache_send(ngx_http_request_t *
         return rc;
     }
 
+    size = c->length - c->body_start;
+    if (size == 0) {
+        return rc;
+    }
+
     b->file_pos = c->body_start;
     b->file_last = c->length;
 
-    b->in_file = (c->length - c->body_start) ? 1: 0;
+    b->in_file = size ? 1: 0;
     b->last_buf = (r == r->main) ? 1: 0;
     b->last_in_chain = 1;