From 57ce367309de9ac1b1938202156eac554420bb2a Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 4 Sep 2021 15:25:40 +0200
Subject: rename file descriptors to handles

---
 src/kernel/handle.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/kernel/handle.h

(limited to 'src/kernel/handle.h')

diff --git a/src/kernel/handle.h b/src/kernel/handle.h
new file mode 100644
index 0000000..4b066ad
--- /dev/null
+++ b/src/kernel/handle.h
@@ -0,0 +1,47 @@
+#pragma once
+#include <kernel/types.h>
+#include <stddef.h>
+
+#define HANDLE_MAX 16
+
+typedef int handle_t; // TODO duplicated in syscalls.h
+
+enum handle_type {
+	HANDLE_EMPTY,
+	HANDLE_SPECIAL_TTY,
+};
+
+struct handle {
+	enum handle_type type;
+};
+
+
+enum handleop { // describes the operations which can be done on handles
+	HANDLEOP_MOUNT, // also closes the original handle
+	HANDLEOP_OPEN,
+
+	HANDLEOP_READ,
+	HANDLEOP_WRITE,
+	HANDLEOP_CLOSE,
+};
+
+struct handleop_args {
+	enum handleop type;
+	struct handle *handle;
+	union {
+		struct { // HANDLEOP_MOUNT
+			struct mount *target;
+		} mnt;
+		struct { // HANDLEOP_OPEN
+			struct handle *target;
+			const char *path; // relative to the mount point
+			size_t len;
+		} open;
+		struct { // HANDLEOP_READ, HANDLEOP_WRITE
+			user_ptr ptr;
+			size_t len;
+		} rw;
+	};
+};
+
+int handleop_dispatch(struct handleop_args args);
-- 
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