syscall_arg__scnprintf_fd
size_t printed = syscall_arg__scnprintf_fd(bf, size, arg);
return syscall_arg__scnprintf_fd(bf, size, arg);
size_t syscall_arg__scnprintf_fd(char *bf, size_t size, struct syscall_arg *arg);
#define SCA_FD syscall_arg__scnprintf_fd
syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_fd);
return syscall_arg__scnprintf_fd(bf, size, arg);