359ee035d8
The syscall helpers.h get_handle functions should be returing j6_err_invalid_arg if the handle they're given is j6_handle_invalid, unless explicitly set to optional.
75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#pragma once
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/// \file syscalls/helpers.h
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/// Utility functions for use in syscall handler implementations
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#include <j6/types.h>
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#include "capabilities.h"
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#include "objects/kobject.h"
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#include "objects/process.h"
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namespace syscalls {
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template <typename T, typename... Args>
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T * construct_handle(j6_handle_t *id, Args... args)
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{
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T *o = new T {args...};
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*id = g_cap_table.create(o, T::creation_caps);
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obj::process &p = obj::process::current();
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p.add_handle(*id);
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return o;
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}
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template <typename T>
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j6_status_t get_handle(j6_handle_t id, j6_cap_t caps, T *&object, bool optional = false)
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{
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if (id == j6_handle_invalid) {
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object = nullptr;
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return optional ? j6_status_ok : j6_err_invalid_arg;
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}
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capability *capdata = g_cap_table.retain(id);
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if (!capdata || capdata->type != T::type)
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return j6_err_invalid_arg;
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obj::process &p = obj::process::current();
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if (!p.has_handle(id) || (capdata->caps & caps) != caps)
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return j6_err_denied;
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object = static_cast<T*>(capdata->object);
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return j6_status_ok;
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}
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template <typename T>
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inline j6_status_t get_handle(j6_handle_t *id, j6_cap_t caps, T *&object, bool optional = false)
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{
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return get_handle<T>(*id, caps, object, optional);
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}
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template <>
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inline j6_status_t get_handle<obj::kobject>(j6_handle_t id, j6_cap_t caps, obj::kobject *&object, bool optional)
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{
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if (id == j6_handle_invalid) {
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object = nullptr;
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return optional ? j6_status_ok : j6_err_invalid_arg;
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}
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capability *capdata = g_cap_table.retain(id);
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if (!capdata)
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return j6_err_invalid_arg;
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obj::process &p = obj::process::current();
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if (!p.has_handle(id) || (capdata->caps & caps) != caps)
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return j6_err_denied;
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object = capdata->object;
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return j6_status_ok;
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}
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inline void release_handle(j6_handle_t id) { g_cap_table.release(id); }
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inline void release_handle(j6_handle_t *id) { g_cap_table.release(*id); }
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} // namespace syscalls
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