syscall_table.h

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#pragma once
 
#include <functional>
#include <memory>
#include <span>
 
#include "contur/core/error.h"
#include "contur/core/types.h"
 
#include "contur/syscall/syscall_handler.h"
#include "contur/syscall/syscall_ids.h"
 
namespace contur {
 
    class ProcessImage;

    class SyscallTable
    {
        public:
        using HandlerFn = std::function<Result<RegisterValue>(std::span<const RegisterValue>, ProcessImage &)>;
 
        SyscallTable();
        ~SyscallTable();
 
        SyscallTable(const SyscallTable &) = delete;
        SyscallTable &operator=(const SyscallTable &) = delete;
        SyscallTable(SyscallTable &&) noexcept;
        SyscallTable &operator=(SyscallTable &&) noexcept;

        [[nodiscard]] Result<void> registerHandler(SyscallId id, HandlerFn handler);

        [[nodiscard]] Result<void> registerHandler(SyscallId id, ISyscallHandler &handler);

        [[nodiscard]] Result<void> unregisterHandler(SyscallId id);

        [[nodiscard]] Result<RegisterValue>
        dispatch(SyscallId id, std::span<const RegisterValue> args, ProcessImage &caller) const;

        [[nodiscard]] bool hasHandler(SyscallId id) const noexcept;

        [[nodiscard]] std::size_t handlerCount() const noexcept;
 
        private:
        struct Impl;
        std::unique_ptr<Impl> impl_;
    };
 
} // namespace contur