From d228cf3638eec3cb44023c506bebb9cfb7372fe9 Mon Sep 17 00:00:00 2001
From: Maxim Dounin <mdounin@mdounin.ru>
Date: Wed, 21 Nov 2012 00:52:35 +0000
Subject: [PATCH] Core: added debug logging of writev() in
 ngx_write_chain_to_file().

---
 src/os/unix/ngx_files.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index d71aec316..65d2320b2 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -241,6 +241,9 @@ ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl, off_t offset,
             return NGX_ERROR;
         }
 
+        ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
+                       "writev: %d, %z", file->fd, n);
+
         file->sys_offset += n;
         file->offset += n;
         total += n;