From: Valentin Bartenev <vbart@nginx.com>
Date: Tue, 17 Nov 2015 16:01:41 +0000 (+0300)
Subject: Adjusted file->sys_offset after the write() syscall.
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=9ef4b63328f534a647b367be1bce3b5a159e7c32;p=nginx.git

Adjusted file->sys_offset after the write() syscall.

This fixes suboptimal behavior caused by surplus lseek() for sequential writes
on systems without pwrite().  A consecutive read after write might result in an
error on systems without pread() and pwrite().

Fortunately, at the moment there are no widely used systems without these
syscalls.
---

diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index 417b598f7..36b6b67ca 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -226,6 +226,7 @@ ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
             return NGX_ERROR;
         }
 
+        file->sys_offset += n;
         file->offset += n;
         written += n;