diff --git a/components/dfs/dfs_v1/filesystems/devfs/devfs.c b/components/dfs/dfs_v1/filesystems/devfs/devfs.c
index 0779a594d0..993f967131 100644
--- a/components/dfs/dfs_v1/filesystems/devfs/devfs.c
+++ b/components/dfs/dfs_v1/filesystems/devfs/devfs.c
@@ -61,7 +61,7 @@ int dfs_device_fs_ioctl(struct dfs_file *file, int cmd, void *args)
     return result;
 }
 
-int dfs_device_fs_read(struct dfs_file *file, void *buf, size_t count)
+ssize_t dfs_device_fs_read(struct dfs_file *file, void *buf, size_t count)
 {
     int result;
     rt_device_t dev_id;
@@ -82,7 +82,7 @@ int dfs_device_fs_read(struct dfs_file *file, void *buf, size_t count)
     return result;
 }
 
-int dfs_device_fs_write(struct dfs_file *file, const void *buf, size_t count)
+ssize_t dfs_device_fs_write(struct dfs_file *file, const void *buf, size_t count)
 {
     int result;
     rt_device_t dev_id;
diff --git a/components/dfs/dfs_v1/filesystems/elmfat/dfs_elm.c b/components/dfs/dfs_v1/filesystems/elmfat/dfs_elm.c
index a2a6258f36..e9680e07bf 100644
--- a/components/dfs/dfs_v1/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/dfs_v1/filesystems/elmfat/dfs_elm.c
@@ -537,7 +537,7 @@ int dfs_elm_ioctl(struct dfs_file *file, int cmd, void *args)
     return -ENOSYS;
 }
 
-int dfs_elm_read(struct dfs_file *file, void *buf, size_t len)
+ssize_t dfs_elm_read(struct dfs_file *file, void *buf, size_t len)
 {
     FIL *fd;
     FRESULT result;
@@ -560,7 +560,7 @@ int dfs_elm_read(struct dfs_file *file, void *buf, size_t len)
     return elm_result_to_dfs(result);
 }
 
-int dfs_elm_write(struct dfs_file *file, const void *buf, size_t len)
+ssize_t dfs_elm_write(struct dfs_file *file, const void *buf, size_t len)
 {
     FIL *fd;
     FRESULT result;
@@ -596,7 +596,7 @@ int dfs_elm_flush(struct dfs_file *file)
     return elm_result_to_dfs(result);
 }
 
-int dfs_elm_lseek(struct dfs_file *file, off_t offset)
+off_t dfs_elm_lseek(struct dfs_file *file, off_t offset)
 {
     FRESULT result = FR_OK;
     if (file->vnode->type == FT_REGULAR)
diff --git a/components/dfs/dfs_v1/filesystems/romfs/dfs_romfs.c b/components/dfs/dfs_v1/filesystems/romfs/dfs_romfs.c
index 8c80b5690e..9ecb0819c4 100644
--- a/components/dfs/dfs_v1/filesystems/romfs/dfs_romfs.c
+++ b/components/dfs/dfs_v1/filesystems/romfs/dfs_romfs.c
@@ -146,7 +146,7 @@ struct romfs_dirent *dfs_romfs_lookup(struct romfs_dirent *root_dirent, const ch
     return NULL;
 }
 
-int dfs_romfs_read(struct dfs_file *file, void *buf, size_t count)
+ssize_t dfs_romfs_read(struct dfs_file *file, void *buf, size_t count)
 {
     rt_size_t length;
     struct romfs_dirent *dirent;
@@ -173,7 +173,7 @@ int dfs_romfs_read(struct dfs_file *file, void *buf, size_t count)
     return length;
 }
 
-int dfs_romfs_lseek(struct dfs_file *file, off_t offset)
+off_t dfs_romfs_lseek(struct dfs_file *file, off_t offset)
 {
     if (offset <= file->vnode->size)
     {
diff --git a/components/dfs/dfs_v1/filesystems/tmpfs/dfs_tmpfs.c b/components/dfs/dfs_v1/filesystems/tmpfs/dfs_tmpfs.c
index d22eb0e016..f690d5750f 100644
--- a/components/dfs/dfs_v1/filesystems/tmpfs/dfs_tmpfs.c
+++ b/components/dfs/dfs_v1/filesystems/tmpfs/dfs_tmpfs.c
@@ -267,7 +267,7 @@ find_subpath:
     return NULL;
 }
 
-int dfs_tmpfs_read(struct dfs_file *file, void *buf, size_t count)
+ssize_t dfs_tmpfs_read(struct dfs_file *file, void *buf, size_t count)
 {
     rt_size_t length;
     struct tmpfs_file *d_file;
@@ -290,7 +290,7 @@ int dfs_tmpfs_read(struct dfs_file *file, void *buf, size_t count)
 }
 
 
-int dfs_tmpfs_write(struct dfs_file *fd, const void *buf, size_t count)
+ssize_t dfs_tmpfs_write(struct dfs_file *fd, const void *buf, size_t count)
 {
     struct tmpfs_file *d_file;
     struct tmpfs_sb *superblock;
@@ -328,7 +328,7 @@ int dfs_tmpfs_write(struct dfs_file *fd, const void *buf, size_t count)
     return count;
 }
 
-int dfs_tmpfs_lseek(struct dfs_file *file, off_t offset)
+off_t dfs_tmpfs_lseek(struct dfs_file *file, off_t offset)
 {
     if (offset <= (off_t)file->vnode->size)
     {
diff --git a/components/dfs/dfs_v1/include/dfs_file.h b/components/dfs/dfs_v1/include/dfs_file.h
index 971089f21b..d36b2ce89b 100644
--- a/components/dfs/dfs_v1/include/dfs_file.h
+++ b/components/dfs/dfs_v1/include/dfs_file.h
@@ -25,10 +25,10 @@ struct dfs_file_ops
     int (*open)     (struct dfs_file *fd);
     int (*close)    (struct dfs_file *fd);
     int (*ioctl)    (struct dfs_file *fd, int cmd, void *args);
-    int (*read)     (struct dfs_file *fd, void *buf, size_t count);
-    int (*write)    (struct dfs_file *fd, const void *buf, size_t count);
+    ssize_t (*read)     (struct dfs_file *fd, void *buf, size_t count);
+    ssize_t (*write)    (struct dfs_file *fd, const void *buf, size_t count);
     int (*flush)    (struct dfs_file *fd);
-    int (*lseek)    (struct dfs_file *fd, off_t offset);
+    off_t (*lseek)    (struct dfs_file *fd, off_t offset);
     int (*getdents) (struct dfs_file *fd, struct dirent *dirp, uint32_t count);
 
     int (*poll)     (struct dfs_file *fd, struct rt_pollreq *req);
@@ -82,12 +82,12 @@ int dfs_file_is_open(const char *pathname);
 int dfs_file_open(struct dfs_file *fd, const char *path, int flags);
 int dfs_file_close(struct dfs_file *fd);
 int dfs_file_ioctl(struct dfs_file *fd, int cmd, void *args);
-int dfs_file_read(struct dfs_file *fd, void *buf, size_t len);
+ssize_t dfs_file_read(struct dfs_file *fd, void *buf, size_t len);
 int dfs_file_getdents(struct dfs_file *fd, struct dirent *dirp, size_t nbytes);
 int dfs_file_unlink(const char *path);
-int dfs_file_write(struct dfs_file *fd, const void *buf, size_t len);
+ssize_t dfs_file_write(struct dfs_file *fd, const void *buf, size_t len);
 int dfs_file_flush(struct dfs_file *fd);
-int dfs_file_lseek(struct dfs_file *fd, off_t offset);
+off_t dfs_file_lseek(struct dfs_file *fd, off_t offset);
 
 int dfs_file_stat(const char *path, struct stat *buf);
 int dfs_file_rename(const char *oldpath, const char *newpath);
diff --git a/components/dfs/dfs_v1/src/dfs_file.c b/components/dfs/dfs_v1/src/dfs_file.c
index 6dbec6e129..094e26c323 100644
--- a/components/dfs/dfs_v1/src/dfs_file.c
+++ b/components/dfs/dfs_v1/src/dfs_file.c
@@ -389,7 +389,7 @@ int dfs_file_ioctl(struct dfs_file *fd, int cmd, void *args)
  *
  * @return the actual read data bytes or 0 on end of file or failed.
  */
-int dfs_file_read(struct dfs_file *fd, void *buf, size_t len)
+ssize_t dfs_file_read(struct dfs_file *fd, void *buf, size_t len)
 {
     int result = 0;
 
@@ -503,7 +503,7 @@ __exit:
  *
  * @return the actual written data length.
  */
-int dfs_file_write(struct dfs_file *fd, const void *buf, size_t len)
+ssize_t dfs_file_write(struct dfs_file *fd, const void *buf, size_t len)
 {
     if (fd == NULL)
     {
@@ -544,7 +544,7 @@ int dfs_file_flush(struct dfs_file *fd)
  *
  * @return the current position after seek.
  */
-int dfs_file_lseek(struct dfs_file *fd, off_t offset)
+off_t dfs_file_lseek(struct dfs_file *fd, off_t offset)
 {
     int result;
 
diff --git a/components/dfs/dfs_v2/filesystems/devfs/devfs.c b/components/dfs/dfs_v2/filesystems/devfs/devfs.c
index 0353a20527..cfd47cdcce 100644
--- a/components/dfs/dfs_v2/filesystems/devfs/devfs.c
+++ b/components/dfs/dfs_v2/filesystems/devfs/devfs.c
@@ -30,9 +30,9 @@ struct device_dirent
 
 int dfs_devfs_open(struct dfs_file *file);
 int dfs_devfs_close(struct dfs_file *file);
-int generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence);
-int dfs_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos);
-int dfs_devfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos);
+off_t generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence);
+ssize_t dfs_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos);
+ssize_t dfs_devfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos);
 int dfs_devfs_ioctl(struct dfs_file *file, int cmd, void *args);
 int dfs_devfs_getdents(struct dfs_file *file, struct dirent *dirp, uint32_t count);
 static int dfs_devfs_poll(struct dfs_file *file, struct rt_pollreq *req);
@@ -275,7 +275,7 @@ int dfs_devfs_ioctl(struct dfs_file *file, int cmd, void *args)
     return result;
 }
 
-int dfs_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
+ssize_t dfs_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
 {
     int result;
     rt_device_t dev_id;
@@ -296,7 +296,7 @@ int dfs_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
     return result;
 }
 
-int dfs_devfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
+ssize_t dfs_devfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
 {
     int result;
     rt_device_t dev_id;
diff --git a/components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c b/components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c
index f4f27bd273..5e0280d941 100644
--- a/components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c
@@ -557,7 +557,7 @@ int dfs_elm_ioctl(struct dfs_file *file, int cmd, void *args)
     return -ENOSYS;
 }
 
-int dfs_elm_read(struct dfs_file *file, void *buf, size_t len, off_t *pos)
+ssize_t dfs_elm_read(struct dfs_file *file, void *buf, size_t len, off_t *pos)
 {
     FIL *fd;
     FRESULT result;
@@ -581,7 +581,7 @@ int dfs_elm_read(struct dfs_file *file, void *buf, size_t len, off_t *pos)
     return elm_result_to_dfs(result);
 }
 
-int dfs_elm_write(struct dfs_file *file, const void *buf, size_t len, off_t *pos)
+ssize_t dfs_elm_write(struct dfs_file *file, const void *buf, size_t len, off_t *pos)
 {
     FIL *fd;
     FRESULT result;
@@ -618,7 +618,7 @@ int dfs_elm_flush(struct dfs_file *file)
     return elm_result_to_dfs(result);
 }
 
-int dfs_elm_lseek(struct dfs_file *file, off_t offset, int wherece)
+off_t dfs_elm_lseek(struct dfs_file *file, off_t offset, int wherece)
 {
     FRESULT result = FR_OK;
     if (file->vnode->type == FT_REGULAR)
diff --git a/components/dfs/dfs_v2/filesystems/romfs/dfs_romfs.c b/components/dfs/dfs_v2/filesystems/romfs/dfs_romfs.c
index 4e9502fc10..81382ae69b 100644
--- a/components/dfs/dfs_v2/filesystems/romfs/dfs_romfs.c
+++ b/components/dfs/dfs_v2/filesystems/romfs/dfs_romfs.c
@@ -228,7 +228,7 @@ static int dfs_romfs_free_vnode(struct dfs_vnode *vnode)
     return 0;
 }
 
-static int dfs_romfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
+static ssize_t dfs_romfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
 {
     rt_size_t length;
     struct romfs_dirent *dirent;
diff --git a/components/dfs/dfs_v2/filesystems/tmpfs/dfs_tmpfs.c b/components/dfs/dfs_v2/filesystems/tmpfs/dfs_tmpfs.c
index 32ddad821c..752fbc2513 100644
--- a/components/dfs/dfs_v2/filesystems/tmpfs/dfs_tmpfs.c
+++ b/components/dfs/dfs_v2/filesystems/tmpfs/dfs_tmpfs.c
@@ -272,7 +272,7 @@ find_subpath:
     return NULL;
 }
 
-static int dfs_tmpfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
+static ssize_t dfs_tmpfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
 {
     rt_size_t length;
     struct tmpfs_file *d_file;
@@ -295,7 +295,7 @@ static int dfs_tmpfs_read(struct dfs_file *file, void *buf, size_t count, off_t
     return length;
 }
 
-static int dfs_tmpfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
+static ssize_t dfs_tmpfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
 {
     struct tmpfs_file *d_file;
     struct tmpfs_sb *superblock;
@@ -334,7 +334,7 @@ static int dfs_tmpfs_write(struct dfs_file *file, const void *buf, size_t count,
     return count;
 }
 
-static int dfs_tmpfs_lseek(struct dfs_file *file, off_t offset, int wherece)
+static off_t dfs_tmpfs_lseek(struct dfs_file *file, off_t offset, int wherece)
 {
     if (offset <= (off_t)file->vnode->size)
     {
diff --git a/components/dfs/dfs_v2/include/dfs_file.h b/components/dfs/dfs_v2/include/dfs_file.h
index 7dbe366fe9..11793b2ad7 100644
--- a/components/dfs/dfs_v2/include/dfs_file.h
+++ b/components/dfs/dfs_v2/include/dfs_file.h
@@ -39,10 +39,10 @@ struct dfs_file_ops
     int (*open)(struct dfs_file *file);
     int (*close)(struct dfs_file *file);
     int (*ioctl)(struct dfs_file *file, int cmd, void *arg);
-    int (*read)(struct dfs_file *file, void *buf, size_t count, off_t *pos);
-    int (*write)(struct dfs_file *file, const void *buf, size_t count, off_t *pos);
+    ssize_t (*read)(struct dfs_file *file, void *buf, size_t count, off_t *pos);
+    ssize_t (*write)(struct dfs_file *file, const void *buf, size_t count, off_t *pos);
     int (*flush)(struct dfs_file *file);
-    int (*lseek)(struct dfs_file *file, off_t offset, int wherece);
+    off_t (*lseek)(struct dfs_file *file, off_t offset, int wherece);
     int (*truncate)(struct dfs_file *file, off_t offset);
     int (*getdents)(struct dfs_file *file, struct dirent *dirp, uint32_t count);
     int (*poll)(struct dfs_file *file, struct rt_pollreq *req);
@@ -142,7 +142,7 @@ int dfs_file_close(struct dfs_file *file);
 
 ssize_t dfs_file_read(struct dfs_file *file, void *buf, size_t len);
 ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len);
-int generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence);
+off_t generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence);
 off_t dfs_file_lseek(struct dfs_file *file, off_t offset, int wherece);
 int dfs_file_stat(const char *path, struct stat *buf);
 int dfs_file_lstat(const char *path, struct stat *buf);
diff --git a/components/dfs/dfs_v2/src/dfs_file.c b/components/dfs/dfs_v2/src/dfs_file.c
index 0bc08bf562..9ed0a2b2c7 100644
--- a/components/dfs/dfs_v2/src/dfs_file.c
+++ b/components/dfs/dfs_v2/src/dfs_file.c
@@ -652,7 +652,7 @@ ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len)
     return ret;
 }
 
-int generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence)
+off_t generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence)
 {
     off_t foffset;
 
diff --git a/components/drivers/ipc/pipe.c b/components/drivers/ipc/pipe.c
index d1e8665963..acd0c2def6 100644
--- a/components/drivers/ipc/pipe.c
+++ b/components/drivers/ipc/pipe.c
@@ -203,9 +203,9 @@ static int pipe_fops_ioctl(struct dfs_file *fd, int cmd, void *args)
  *           When the return value is -EAGAIN, it means there are no data to be read.
  */
 #ifdef RT_USING_DFS_V2
-static int pipe_fops_read(struct dfs_file *fd, void *buf, size_t count, off_t *pos)
+static ssize_t pipe_fops_read(struct dfs_file *fd, void *buf, size_t count, off_t *pos)
 #else
-static int pipe_fops_read(struct dfs_file *fd, void *buf, size_t count)
+static ssize_t pipe_fops_read(struct dfs_file *fd, void *buf, size_t count)
 #endif
 {
     int len = 0;
@@ -261,9 +261,9 @@ out:
  *           When the return value is -EPIPE, it means there is no thread that has the pipe open for reading.
  */
 #ifdef RT_USING_DFS_V2
-static int pipe_fops_write(struct dfs_file *fd, const void *buf, size_t count, off_t *pos)
+static ssize_t pipe_fops_write(struct dfs_file *fd, const void *buf, size_t count, off_t *pos)
 #else
-static int pipe_fops_write(struct dfs_file *fd, const void *buf, size_t count)
+static ssize_t pipe_fops_write(struct dfs_file *fd, const void *buf, size_t count)
 #endif
 {
     int len;
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;
diff --git a/components/drivers/tty/tty.c b/components/drivers/tty/tty.c
index 53f7ae1e59..30ab00d890 100644
--- a/components/drivers/tty/tty.c
+++ b/components/drivers/tty/tty.c
@@ -306,9 +306,9 @@ static int tty_ioctl(struct dfs_file *fd, int cmd, void *args)
 }
 
 #ifdef RT_USING_DFS_V2
-static int tty_read(struct dfs_file *fd, void *buf, size_t count, off_t *pos)
+static ssize_t tty_read(struct dfs_file *fd, void *buf, size_t count, off_t *pos)
 #else
-static int tty_read(struct dfs_file *fd, void *buf, size_t count)
+static ssize_t tty_read(struct dfs_file *fd, void *buf, size_t count)
 #endif
 {
     int ret = 0;
@@ -327,9 +327,9 @@ static int tty_read(struct dfs_file *fd, void *buf, size_t count)
 }
 
 #ifdef RT_USING_DFS_V2
-static int tty_write(struct dfs_file *fd, const void *buf, size_t count, off_t *pos)
+static ssize_t tty_write(struct dfs_file *fd, const void *buf, size_t count, off_t *pos)
 #else
-static int tty_write(struct dfs_file *fd, const void *buf, size_t count )
+static ssize_t tty_write(struct dfs_file *fd, const void *buf, size_t count )
 #endif
 {
     int ret = 0;
diff --git a/components/net/sal/dfs_net/dfs_net.c b/components/net/sal/dfs_net/dfs_net.c
index 8179abdcb5..cae03c40a1 100644
--- a/components/net/sal/dfs_net/dfs_net.c
+++ b/components/net/sal/dfs_net/dfs_net.c
@@ -47,9 +47,9 @@ static int dfs_net_ioctl(struct dfs_file* file, int cmd, void* args)
 }
 
 #ifdef RT_USING_DFS_V2
-static int dfs_net_read(struct dfs_file* file, void *buf, size_t count, off_t *pos)
+static ssize_t dfs_net_read(struct dfs_file* file, void *buf, size_t count, off_t *pos)
 #else
-static int dfs_net_read(struct dfs_file* file, void *buf, size_t count)
+static ssize_t dfs_net_read(struct dfs_file* file, void *buf, size_t count)
 #endif
 {
     int ret;
@@ -66,9 +66,9 @@ static int dfs_net_read(struct dfs_file* file, void *buf, size_t count)
 }
 
 #ifdef RT_USING_DFS_V2
-static int dfs_net_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
+static ssize_t dfs_net_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
 #else
-static int dfs_net_write(struct dfs_file *file, const void *buf, size_t count)
+static ssize_t dfs_net_write(struct dfs_file *file, const void *buf, size_t count)
 #endif
 {
     int ret;