src/kernel/handle.h


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#pragma once

enum handle_type; // forward declaration for proc.h

#include <kernel/vfs/mount.h>
#include <shared/types.h>
#include <stddef.h>

enum handle_type {
	HANDLE_INVALID = 0,
	HANDLE_FILE,
	HANDLE_PIPE,
	HANDLE_FS_FRONT,
};

struct handle {
	enum handle_type type;
	struct vfs_backend *backend; // HANDLE_FILE | HANDLE_FS_FRONT
	void __user *file_id; // only applicable to HANDLE_FILE
	struct {
		struct process *queued;
		bool write_end;
		struct handle *sister; // the other end, not included in refcount
	} pipe;

	size_t refcount;
};

struct handle *handle_init(enum handle_type);
void handle_close(struct handle *);