Imported Genode release 11.11

libports/include/libc-plugin/fd_alloc.h

@@ -0,0 +1,69 @@
+/*
+ * \brief  file descriptor allocator interface
+ * \author Christian Prochaska 
+ * \date   2010-01-21
+ *
+ */
+
+/*
+ * Copyright (C) 2010-2011 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _LIBC_PLUGIN__FD_ALLOC_H_
+#define _LIBC_PLUGIN__FD_ALLOC_H_
+
+#include <base/allocator_avl.h>
+
+#include <libc-plugin/plugin.h>
+
+enum { MAX_NUM_FDS = 1024 };
+
+namespace Libc {
+
+	/**
+	 * Plugin-specific file-descriptor context
+	 */
+	class Plugin_context { };
+
+
+	struct File_descriptor
+	{
+		int             libc_fd;
+		Plugin         *plugin;
+		Plugin_context *context;
+	};
+
+
+	class File_descriptor_allocator : Allocator_avl_tpl<File_descriptor>
+	{
+		public:
+
+			/**
+			 * Constructor
+			 */
+			File_descriptor_allocator();
+
+			/**
+			 * Allocate file descriptor
+			 */
+			File_descriptor *alloc(Plugin *plugin, Plugin_context *context, int libc_fd = -1);
+
+			/**
+			 * Release file descriptor
+			 */
+			void free(File_descriptor *fdo);
+
+			File_descriptor *find_by_libc_fd(int libc_fd);
+	};
+
+
+	/**
+	 * Return singleton instance of file-descriptor allocator
+	 */
+	extern File_descriptor_allocator *file_descriptor_allocator();
+}
+
+#endif /* _LIBC_PLUGIN__FD_ALLOC_H_ */