[libc][syscalls] 在标准输入输出前加校验，反正在libc初始化之前调用printf出问题

Author: mysterywolf

components/libc/compilers/armlibc/syscalls.c

@@ -25,6 +25,10 @@
 #include <dfs_posix.h>
 #endif
 
+#define DBG_TAG    "armlibc.syscalls"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
 #ifdef __CLANG_ARM
 __asm(".global __use_no_semihosting\n\t");
 #else
@@ -146,6 +150,11 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
     if (fh == STDIN)
     {
 #ifdef RT_USING_POSIX
+        if (libc_stdio_get_console() < 0)
+        {
+            LOG_E("invoke standard output before initializing libc");
+            return -1;
+        }
         size = read(STDIN_FILENO, buf, len);
         return len - size;
 #else
@@ -186,6 +195,11 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
         return 0;
 #else
 #ifdef RT_USING_POSIX
+        if (libc_stdio_get_console() < 0)
+        {
+            LOG_E("invoke standard input before initializing libc");
+            return -1;
+        }
         size = write(STDOUT_FILENO, buf, len);
         return len - size;
 #else

components/libc/compilers/dlib/syscall_read.c

@@ -15,6 +15,10 @@
 #include <yfuns.h>
 #include "libc.h"
 
+#define DBG_TAG    "dlib.syscall_read"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
 #pragma module_name = "?__read"
 size_t __read(int handle, unsigned char *buf, size_t len)
 {
@@ -25,6 +29,11 @@ size_t __read(int handle, unsigned char *buf, size_t len)
     if (handle == _LLIO_STDIN)
     {
 #ifdef RT_USING_POSIX
+        if (libc_stdio_get_console() < 0)
+        {
+            LOG_E("invoke standard input before initializing libc");
+            return _LLIO_ERROR;
+        }
         return read(STDIN_FILENO, buf, len);
 #else
         return _LLIO_ERROR;

components/libc/compilers/dlib/syscall_write.c

@@ -15,6 +15,10 @@
 #include <yfuns.h>
 #include "libc.h"
 
+#define DBG_TAG    "dlib.syscall_write"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
 #pragma module_name = "?__write"
 
 size_t __write(int handle, const unsigned char *buf, size_t len)
@@ -30,6 +34,11 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 #else
 
 #ifdef RT_USING_POSIX
+        if (libc_stdio_get_console() < 0)
+        {
+            LOG_E("invoke standard output before initializing libc");
+            return _LLIO_ERROR;
+        }
         return write(STDOUT_FILENO, (void*)buf, len);
 #else
         rt_device_t console_device;

components/libc/compilers/newlib/syscalls.c

@@ -26,6 +26,10 @@
 #include <dlmodule.h>
 #endif
 
+#define DBG_TAG    "newlib.syscalls"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
 /* Reentrant versions of system calls.  */
 
 #ifndef _REENT_ONLY
@@ -155,7 +159,11 @@ _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
     return -1;
 #else
     _ssize_t rc;
-
+    if (libc_stdio_get_console() < 0 && fd == STDIN_FILENO)
+    {
+        LOG_E("invoke standard input before initializing libc");
+        return -1;
+    }
     rc = read(fd, buf, nbytes);
     return rc;
 #endif
@@ -227,7 +235,11 @@ _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 #endif /*RT_USING_DEVICE*/
 #else
     _ssize_t rc;
-
+    if (libc_stdio_get_console() < 0 && fd == STDOUT_FILENO)
+    {
+        LOG_E("invoke standard output before initializing libc");
+        return -1;
+    }
     rc = write(fd, buf, nbytes);
     return rc;
 #endif