From cb8d5c5d9d3fed61114ed1824b6f0615c31e86c3 Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Wed, 10 Nov 2021 18:33:43 -0500
Subject: [PATCH] =?UTF-8?q?[libc][gcc]=20=E9=87=8D=E6=96=B0=E6=A2=B3?=
 =?UTF-8?q?=E7=90=86fread=20fwrite=E6=A1=A9=E5=87=BD=E6=95=B0=E5=AE=9E?=
 =?UTF-8?q?=E7=8E=B0?=
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---
 .../libc/compilers/gcc/newlib/syscalls.c      | 53 +++++++++++++------
 1 file changed, 37 insertions(+), 16 deletions(-)

diff --git a/components/libc/compilers/gcc/newlib/syscalls.c b/components/libc/compilers/gcc/newlib/syscalls.c
index e957aaf003..7c25ffac3f 100644
--- a/components/libc/compilers/gcc/newlib/syscalls.c
+++ b/components/libc/compilers/gcc/newlib/syscalls.c
@@ -216,13 +216,27 @@ int _open_r(struct _reent *ptr, const char *file, int flags, int mode)
 
 _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 {
-#ifdef RT_USING_POSIX_STDIO
+#ifdef RT_USING_POSIX
     _ssize_t rc;
-    if (libc_stdio_get_console() < 0 && fd == STDIN_FILENO)
+    if (fd == STDIN_FILENO)
     {
-        LOG_W("Do not invoke standard input before initializing libc");
-        return 0;
+#ifdef RT_USING_POSIX_STDIO
+        if (libc_stdio_get_console() < 0)
+        {
+            LOG_W("Do not invoke standard input before initializing libc");
+            return 0;
+        }
+#else
+        ptr->_errno = ENOTSUP;
+        return -1;
+#endif /* RT_USING_POSIX_STDIO */
     }
+    else if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
+    {
+        ptr->_errno = ENOTSUP;
+        return -1;
+    }
+
     rc = read(fd, buf, nbytes);
     return rc;
 #else
@@ -271,27 +285,34 @@ _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
 #ifdef RT_USING_POSIX
     _ssize_t rc;
-#ifdef RT_USING_POSIX_STDIO
-    if (libc_stdio_get_console() < 0 && fd == STDOUT_FILENO)
-    {
-        LOG_W("Do not invoke standard output before initializing libc");
-        return 0;
-    }
-#endif /* RT_USING_POSIX_STDIO */
-    rc = write(fd, buf, nbytes);
-    return rc;
-#elif defined(RT_USING_CONSOLE)
-    if (STDOUT_FILENO == fd)
+#endif /* RT_USING_POSIX */
+
+    if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
     {
+#ifdef RT_USING_CONSOLE
         rt_device_t console;
 
         console = rt_console_get_device();
         if (console)
             return rt_device_write(console, -1, buf, nbytes);
+#else
+        ptr->_errno = ENOTSUP;
+        return -1;
+#endif /* RT_USING_CONSOLE */
     }
-#endif /* RT_USING_POSIX */
+    else if (fd == STDIN_FILENO)
+    {
+        ptr->_errno = ENOTSUP;
+        return -1;
+    }
+
+#ifdef RT_USING_POSIX
+    rc = write(fd, buf, nbytes);
+    return rc;
+#else
     ptr->_errno = ENOTSUP;
     return -1;
+#endif /* RT_USING_POSIX */
 }
 
 /* for exit() and abort() */