Implement controls for file descriptor inheritance

[libs/core.git] / source / io / file.h

diff --git a/source/io/file.h b/source/io/file.h
index 6c7169718872a4fb5b8128723fd5ebcb28ba711c..85075d0cca6e8709db663012ced369dd5f0cda52 100644 (file)
--- a/source/io/file.h
+++ b/source/io/file.h
@@ -15,6 +15,14 @@ class file_not_found: public std::runtime_error
 {
 public:
        file_not_found(const std::string &fn): std::runtime_error(fn) { }
+       ~file_not_found() throw() { }
+};
+
+class file_already_exists: public std::runtime_error
+{
+public:
+       file_already_exists(const std::string &fn): std::runtime_error(fn) { }
+       ~file_already_exists() throw() { }
 };
 
 
@@ -30,7 +38,10 @@ public:
        {
                C_NONE = 0,
                C_CREATE = 1,
-               C_TRUNCATE = 2
+               C_TRUNCATE = 2,
+               C_OVERWRITE = C_CREATE+C_TRUNCATE,
+               C_EXCLUSIVE = 4,
+               C_NEW = C_CREATE+C_EXCLUSIVE
        };
 
 private:
@@ -40,10 +51,14 @@ public:
        /** Creates a new file object and opens it.  If the create flag is set and
        write access is requested and the file does exist, it is created.  Otherwise
        a missing file is an error. */
-       File(const std::string &, Mode = M_READ, CreateMode = CreateMode(C_CREATE+C_TRUNCATE));
+       File(const std::string &, Mode = M_READ, CreateMode = C_OVERWRITE);
+private:
+       void platform_init(const std::string &, CreateMode);
+public:
        virtual ~File();
 
-       void set_block(bool);
+       virtual void set_block(bool);
+       virtual void set_inherit(bool);
 
 protected:
        virtual unsigned do_write(const char *, unsigned);
@@ -54,6 +69,8 @@ public:
 
        virtual SeekOffset seek(SeekOffset, SeekType);
        virtual SeekOffset tell() const;
+
+       virtual const Handle &get_handle(Mode);
 };
 
 inline File::CreateMode operator|(File::CreateMode m, File::CreateMode n)
@@ -65,7 +82,34 @@ inline File::CreateMode operator&(File::CreateMode m, File::CreateMode n)
 inline File::CreateMode operator~(File::CreateMode m)
 { return File::CreateMode(~static_cast<int>(m)); }
 
-typedef Filtered<File, Buffered> BufferedFile;
+
+class BufferedFile: public Seekable
+{
+private:
+       File file;
+       Buffered buffer;
+       SeekOffset position;
+
+public:
+       BufferedFile(const std::string &, Mode = M_READ, File::CreateMode = File::C_OVERWRITE);
+
+       virtual void set_block(bool);
+       virtual void set_inherit(bool);
+
+protected:
+       virtual unsigned do_write(const char *, unsigned);
+       virtual unsigned do_read(char *, unsigned);
+public:
+       virtual unsigned put(char);
+
+       virtual bool getline(std::string &);
+       virtual int get();
+
+       virtual const Handle &get_handle(Mode);
+
+       virtual SeekOffset seek(SeekOffset, SeekType);
+       virtual SeekOffset tell() const { return position; }
+};
 
 } // namespace IO
 } // namespace Msp