haiku/headers/private/kernel/util/syscall_args.h

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// syscall_args.h
#ifndef _SYSCALL_ARGS_H
#define _SYSCALL_ARGS_H
#include <vm.h>
// Hack to be able to use the CHECK_USER_ADDRESS macro when compiling for R5.
#ifdef R5_MEMORY_LAYOUT
# undef KERNEL_BASE
# define KERNEL_BASE 0x0
#endif
// copy_ref_var_from_user
template<typename T>
inline
status_t
copy_ref_var_from_user(T *user, T &kernel)
{
if (!CHECK_USER_ADDRESS(user))
return B_BAD_ADDRESS;
return user_memcpy(&kernel, user, sizeof(T));
}
// copy_ref_var_to_user
template<typename T>
inline
status_t
copy_ref_var_to_user(T &kernel, T *user)
{
if (!CHECK_USER_ADDRESS(user))
return B_BAD_ADDRESS;
return user_memcpy(user, &kernel, sizeof(T));
}
#endif // _SYSCALL_ARGS_H