3 files changed, 8 insertions, 8 deletions
diff --git a/components/dfs/src/poll.c b/components/dfs/src/dfs_poll.c
index d1e0372494..607b3487be 100644
--- a/components/dfs/src/poll.c
+++ b/components/dfs/src/dfs_poll.c
@@ -17,7 +17,7 @@
 #include <dfs.h>
 #include <dfs_file.h>
 #include <dfs_posix.h>
-#include <dfs_poll.h>
+#include <poll.h>
 
 #ifdef RT_USING_POSIX
 
diff --git a/components/dfs/src/dfs_posix.c b/components/dfs/src/dfs_posix.c
index a7c306366f..ed3fdb2eeb 100644
--- a/components/dfs/src/dfs_posix.c
+++ b/components/dfs/src/dfs_posix.c
@@ -110,10 +110,10 @@ RTM_EXPORT(close);
  * @return the actual read data buffer length. If the returned value is 0, it
  * may be reach the end of file, please check errno.
  */
-#if defined(RT_USING_NEWLIB) && defined(_EXFUN)
-_READ_WRITE_RETURN_TYPE _EXFUN(read, (int fd, void *buf, size_t len))
+#ifdef _READ_WRITE_RETURN_TYPE
+_READ_WRITE_RETURN_TYPE read(int fd, void *buf, size_t len) /* some gcc tool chains will use different data structure */
 #else
-int read(int fd, void *buf, size_t len)
+ssize_t read(int fd, void *buf, size_t len)
 #endif
 {
     int result;
@@ -154,10 +154,10 @@ RTM_EXPORT(read);
  *
  * @return the actual written data buffer length.
  */
-#if defined(RT_USING_NEWLIB) && defined(_EXFUN)
-_READ_WRITE_RETURN_TYPE _EXFUN(write, (int fd, const void *buf, size_t len))
+#ifdef _READ_WRITE_RETURN_TYPE
+_READ_WRITE_RETURN_TYPE write(int fd, const void *buf, size_t len) /* some gcc tool chains will use different data structure */
 #else
-int write(int fd, const void *buf, size_t len)
+ssize_t write(int fd, const void *buf, size_t len)
 #endif
 {
     int result;
diff --git a/components/dfs/src/select.c b/components/dfs/src/dfs_select.c
index c9286ca97f..ca9c549259 100644
--- a/components/dfs/src/select.c
+++ b/components/dfs/src/dfs_select.c
@@ -11,7 +11,7 @@
 #include <dfs_fs.h>
 #include <dfs_posix.h>
 
-#include <dfs_poll.h>
+#include <poll.h>
 #include <dfs_select.h>
 
 #ifdef RT_USING_POSIX