完善IAR KEIL的read write桩函数

1 files changed, 9 insertions, 5 deletions

diff --git a/components/libc/compilers/dlib/syscall_read.c b/components/libc/compilers/dlib/syscall_read.c
index c926c577b5..0df9766df2 100644
--- a/components/libc/compilers/dlib/syscall_read.c
+++ b/components/libc/compilers/dlib/syscall_read.c
@@ -9,7 +9,7 @@
  */
 
 #include <rtthread.h>
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
 #include <unistd.h>
 #ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
@@ -22,17 +22,21 @@
 #pragma module_name = "?__read"
 size_t __read(int handle, unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_POSIX_STDIO
+#ifdef RT_USING_POSIX
     int size;
 
     if (handle == _LLIO_STDIN)
     {
+#ifdef RT_USING_POSIX_STDIO
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard input before initializing libc");
-            return 0;
+            return 0; /* error, but keep going */
         }
-        return read(STDIN_FILENO, buf, len);
+        return read(STDIN_FILENO, buf, len); /* return the length of the data read */
+#else
+        return _LLIO_ERROR;
+#endif /* RT_USING_POSIX_STDIO */
     }
     else if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
@@ -40,7 +44,7 @@ size_t __read(int handle, unsigned char *buf, size_t len)
     }
 
     size = read(handle, buf, len);
-    return size;
+    return size; /* return the length of the data read */
 #else
     return _LLIO_ERROR;
 #endif /* RT_USING_POSIX */