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-rw-r--r--src/device.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/device.c b/src/device.c
index beba062952..9665788c77 100644
--- a/src/device.c
+++ b/src/device.c
@@ -311,7 +311,7 @@ RTM_EXPORT(rt_device_close);
*
* @note the unit of size/pos is a block for block device.
*/
-rt_size_t rt_device_read(rt_device_t dev,
+rt_ssize_t rt_device_read(rt_device_t dev,
rt_off_t pos,
void *buffer,
rt_size_t size)
@@ -354,7 +354,7 @@ RTM_EXPORT(rt_device_read);
*
* @note the unit of size/pos is a block for block device.
*/
-rt_size_t rt_device_write(rt_device_t dev,
+rt_ssize_t rt_device_write(rt_device_t dev,
rt_off_t pos,
const void *buffer,
rt_size_t size)