fs, feat: File add fd property (#256)

Author: ngot

fibjs/include/File.h

@@ -50,6 +50,7 @@ class File : public File_base {
 public:
     // File_base
     virtual result_t get_name(exlib::string& retVal);
+    virtual result_t get_fd(int32_t& retVal);
     virtual result_t chmod(int32_t mode, AsyncEvent* ac);
 
 public:

fibjs/include/ifs/File.h

@@ -25,6 +25,7 @@ class File_base : public SeekableStream_base {
 public:
     // File_base
     virtual result_t get_name(exlib::string& retVal) = 0;
+    virtual result_t get_fd(int32_t& retVal) = 0;
     virtual result_t chmod(int32_t mode, AsyncEvent* ac) = 0;
 
 public:
@@ -40,6 +41,7 @@ class File_base : public SeekableStream_base {
 
 public:
     static void s_get_name(v8::Local<v8::String> property, const v8::PropertyCallbackInfo<v8::Value>& args);
+    static void s_get_fd(v8::Local<v8::String> property, const v8::PropertyCallbackInfo<v8::Value>& args);
     static void s_chmod(const v8::FunctionCallbackInfo<v8::Value>& args);
 
 public:
@@ -55,7 +57,8 @@ inline ClassInfo& File_base::class_info()
     };
 
     static ClassData::ClassProperty s_property[] = {
-        { "name", s_get_name, block_set, false }
+        { "name", s_get_name, block_set, false },
+        { "fd", s_get_fd, block_set, false }
     };
 
     static ClassData s_cd = {
@@ -80,6 +83,18 @@ inline void File_base::s_get_name(v8::Local<v8::String> property, const v8::Prop
     METHOD_RETURN();
 }
 
+inline void File_base::s_get_fd(v8::Local<v8::String> property, const v8::PropertyCallbackInfo<v8::Value>& args)
+{
+    int32_t vr;
+
+    METHOD_INSTANCE(File_base);
+    PROPERTY_ENTER();
+
+    hr = pInst->get_fd(vr);
+
+    METHOD_RETURN();
+}
+
 inline void File_base::s_chmod(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
     METHOD_INSTANCE(File_base);

fibjs/include/ifs/File.idl

@@ -10,6 +10,9 @@ interface File : SeekableStream
     /*! @brief 查询当前文件名 */
     readonly String name;
 
+    /*! @brief 查询当前文件描述符 */
+    readonly Integer fd;
+
     /*! @brief 查询当前文件的访问权限，Windows 不支持此方法
      @param mode 指定设定的访问权限
      */

fibjs/src/fs/File.cpp

@@ -252,6 +252,15 @@ result_t File::get_name(exlib::string& retVal)
     return 0;
 }
 
+result_t File::get_fd(int32_t& retVal)
+{
+    if (m_fd == -1)
+        return CHECK_ERROR(CALL_E_INVALID_CALL);
+
+    retVal = m_fd;
+    return 0;
+}
+
 #ifdef _WIN32
 
 result_t File::stat(obj_ptr<Stat_base>& retVal, AsyncEvent* ac)