From 7ac2c9846be1f8c82dacf17cf36551c5ccaf278a Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Wed, 01 Jan 2020 20:09:43 +0800
Subject: [PATCH] add app_ddns program

---
 ch1_fileIO/file_io.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/ch1_fileIO/file_io.c b/ch1_fileIO/file_io.c
index cc1f391..79b2365 100644
--- a/ch1_fileIO/file_io.c
+++ b/ch1_fileIO/file_io.c
@@ -1,6 +1,7 @@
 #include <stdio.h>   
 #include <errno.h>
 #include <string.h> 
+#include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>

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