unsigned struct_group_sz = sizeof(struct group);
unsigned siginfo_t_sz = sizeof(siginfo_t);
unsigned struct_sigaction_sz = sizeof(struct sigaction);
+unsigned struct_stack_t_sz = sizeof(stack_t);
unsigned struct_itimerval_sz = sizeof(struct itimerval);
unsigned pthread_t_sz = sizeof(pthread_t);
unsigned pthread_mutex_t_sz = sizeof(pthread_mutex_t);