modify some function prototypes of the dfs_file_ops structure and the function declarations based on it (#7849)

1 files changed, 4 insertions, 4 deletions

diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
index fd904078f7..1777a231b3 100644
--- a/components/drivers/serial/serial.c
+++ b/components/drivers/serial/serial.c
@@ -136,9 +136,9 @@ static int serial_fops_ioctl(struct dfs_file *fd, int cmd, void *args)
 }
 
 #ifdef RT_USING_DFS_V2
-static int serial_fops_read(struct dfs_file *fd, void *buf, size_t count, off_t *pos)
+static ssize_t serial_fops_read(struct dfs_file *fd, void *buf, size_t count, off_t *pos)
 #else
-static int serial_fops_read(struct dfs_file *fd, void *buf, size_t count)
+static ssize_t serial_fops_read(struct dfs_file *fd, void *buf, size_t count)
 #endif
 {
     int size = 0;
@@ -174,9 +174,9 @@ static int serial_fops_read(struct dfs_file *fd, void *buf, size_t count)
 }
 
 #ifdef RT_USING_DFS_V2
-static int serial_fops_write(struct dfs_file *fd, const void *buf, size_t count, off_t *pos)
+static ssize_t serial_fops_write(struct dfs_file *fd, const void *buf, size_t count, off_t *pos)
 #else
-static int serial_fops_write(struct dfs_file *fd, const void *buf, size_t count)
+static ssize_t serial_fops_write(struct dfs_file *fd, const void *buf, size_t count)
 #endif
 {
     rt_device_t device;