From ff94a13ba95f9ce6697ef47c95071dd9b2ab424e Mon Sep 17 00:00:00 2001
From: Guo Wenxue <guowenxue@gmail.com>
Date: Wed, 05 Dec 2018 21:23:23 +0800
Subject: [PATCH] Add IPC singal.c sample code

---
 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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