int status; pid t pid; void func () signal(SIGUSR1,func);/ * if (pid=fork()){ kil(pid,SIGUSR1)/快 wait(&status):/六 */ printf("status=%d:Parent finish:\n",status); else{ sleep(10);/ exit (0);/* 制 void func { printf("It is signal processing function.In"); } (b)illustrate the function of this program. A卷总8_页第8页A 卷 总 8 页 第 8 页 int status； pid_t pid； void func ( )； signal (SIGUSR1,func)；/*________________________________________________________________ */ if (pid=fork () ) { /*________________________________________________________________*/ kill (pid, SIGUSR1)； /* _______________________________________________________ */ wait (& status)； /*___________________________________________________________*/ printf ("status=%d: Parent finish:\n"，status)； } else { sleep (10)； /*___________________________________________________________________*/ exit (0)；/*___________________________________________________________________*/ } void func () { printf ("It is signal processing function.\n")； } (b) illustrate the function of this program