Implementation of ticket conductor issues

Driver_code.c # include <Stdio. h> # Include <Stdlib. h> # Include <Unistd. h> # Include <Sys/types. h> # Include <Fcntl. h> # Include <Semaphore. h> Char Sem_name1 [] = "  Sem1  "  ;  Char Sem_name2 [] = " Sem2  "  ;  Int  Main (){  Int  I; sem_t * Sem1; sem_t * Sem2; sem1 = Sem_open (sem_name1, o_creat, 0644 , 0  );  If (Sem1 = Sem_failed) {perror (  " Unable to create semphore  "  ); Sem_unlink (sem_name1); exit ( - 1  );} Sem2 = Sem_open (sem_name2, o_creat, 0644 , 0  );  If (Sem2 = Sem_failed) {perror (  "  Unable to create semphore  " ); Sem_unlink (sem_name2); exit ( - 1  );}  For (I = 0 ; I < 5 ; I ++ ) {Sem_wait (sem1); printf (  "  Driver: Drive \ n  "  ); Sleep (  5  ); Printf (  " Driver: Stop \ n  "  ); Sleep (  2  ); Sem_post (sem2);} sem_close (sem1); sem_close (sem2); sem_unlink (sem_name1); sem_unlink (sem_name2); exit (  0  );} Sales_code.c # include <Stdio. h> # Include <Stdlib. h> # Include <Unistd. h> # Include <Sys/types. h> # Include <Fcntl. h> # Include <Semaphore. h> Char Sem_name1 [] = "  Sem1  "  ;  Char Sem_name2 [] = "  Sem2  "  ;  Int  Main (){  Int  I; sem_t * Sem1; sem_t *Sem2; sem1 = Sem_open (sem_name1, 0 , 0644 , 0  );  If (Sem1 = Sem_failed) {perror (  "  Unable to create semphore  "  ); Sem_unlink (sem_name1); exit ( - 1  );} Sem2 = Sem_open (sem_name2, 0 , 0644 , 0  );  If (Sem2 = Sem_failed) {perror (  "  Unable to create semphore  "  ); Sem_unlink (sem_name2); exit ( - 1  );}  For (I = 0 ; I < 5 ; I ++) {Printf (  "  Seller: Close door. \ n  "  ); Sleep (  1  ); Sem_post (sem1); sleep (  2  ); Printf (  "  Seller: vendor. \ n  "  ); Sem_wait (sem2); printf (  "  Seller: open and let out or in. \ n "  ); Sleep (  3  );} Sem_close (sem1); sem_close (sem2 );  /*  Sem_unlink (sem1); sem_unlink (sem2 );  */  Exit (  0  );}