From f58d3c5200d5a51a39503c5311422e2fb99d3d20 Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Sun, 5 Feb 2023 18:35:33 -0500
Subject: rt_device_write/read return data type as rt_ssize_t rt_ssize_t can
 give negative error code, which follows the unix style correctly

---
 libcpu/xilinx/microblaze/serial.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'libcpu/xilinx')

diff --git a/libcpu/xilinx/microblaze/serial.c b/libcpu/xilinx/microblaze/serial.c
index 1902f11710..ea0070fb23 100755
--- a/libcpu/xilinx/microblaze/serial.c
+++ b/libcpu/xilinx/microblaze/serial.c
@@ -144,7 +144,7 @@ static rt_err_t rt_serial_close(rt_device_t dev)
     return RT_EOK;
 }
 
-static rt_size_t rt_serial_read (rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
+static rt_ssize_t rt_serial_read (rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
 {
     rt_uint8_t* ptr;
     struct rt_mb_uart_lite *serial = (struct rt_mb_uart_lite*)dev;
@@ -212,7 +212,7 @@ static rt_size_t rt_serial_read (rt_device_t dev, rt_off_t pos, void* buffer, rt
     return 0;
 }
 
-static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
+static rt_ssize_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
 {
     rt_uint8_t* ptr;
     struct rt_mb_uart_lite *serial = (struct rt_mb_uart_lite*)dev;
-- 
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