sigsys_handler
sa.sa_handler = sigsys_handler;
sa.sa_handler = sigsys_handler;
void sigsys_handler(int);
sa.sa_handler = sigsys_handler;
osig = signal(SIGSYS, sigsys_handler);
osig = signal(SIGSYS, sigsys_handler);
osig = signal(SIGSYS, sigsys_handler);
osig = signal(SIGSYS, sigsys_handler);
osig = signal(SIGSYS, sigsys_handler);