int main (int argc, char **argv)
{
struct sembuf buf = {0, 0, 0}; //declaration buf structure
int semid = createSem(PATH, PROJECTID, SEMVALUE, IPC_CREAT | WRITEREADATT); //create semaphore
switch(fork())
{
case -1: //if fork error
perror(FORKERROR);
exit(1);
break;
case 0:
printData(semid); //print process id and sem data
buf.sem_op = CLOSE; // close semaphore
if(semop(semid, &buf, 1) == -1) // send cmd
{
perror(SEMOPERROR);
exit(EXIT_FAILURE);
}
criticalSection(); // do sth
printData(semid); //print process id and sem data
buf.sem_op = OPEN; // open semaphore
if(semop(semid, &buf, 1) == -1) // send cmd
{
perror(SEMOPERROR);
exit(EXIT_FAILURE);
}
break;
default:
printData(semid); //print process id and sem data
buf.sem_op = CLOSE; // close semaphore
if(semop(semid, &buf, 1) == -1) // send cmd
{
perror(SEMOPERROR);
exit(EXIT_FAILURE);
}
criticalSection(); // do sth
printData(semid); //print process id and sem data
buf.sem_op = OPEN; // open semaphore
if(semop(semid, &buf, 1) == -1) // send cmd
{
perror(SEMOPERROR);
exit(EXIT_FAILURE);
}
printf(PARENTEND); //end of parent
printData(semid); //print process id and sem data
if(wait(NULL) == -1) // wait for children
{
perror(WAITERROR);
exit(EXIT_FAILURE);
}
printf(SEMDELETE, semid);
deleteSem(semid); // delete sem
break;
}
return 0;
}
int bumount() {
if (close(fichero) < 0) {
printf("bloques.c: > bumount \n");
return -1;
}
deleteSem();
return 0;
}
