receive_fd
ret = receive_fd(f, NULL, perm_to_file_flags(entry.perm));
EXPORT_SYMBOL_GPL(receive_fd);
int receive_fd(struct file *file, int __user *ufd, unsigned int o_flags);
return receive_fd(f, ufd, flags);
ret = receive_fd(req->file, NULL, ifi->o_flags);
ret = receive_fd(file, NULL, O_CLOEXEC);
fd = receive_fd(addfd->file, NULL, addfd->flags);