Question

I have a program that creates semaphore. But when i try to use SETALL, i get the error in errno as

Numerical result out of range

if((temp_semid = semget(IPC_PRIVATE, 250, 0666 | IPC_CREAT)) != -1)
{    
  semun arg; 
  ushort array[100];
  memset(array,0, 100);
  arg.array = array;
  if(semctl(temp_semid, 0, SETALL, arg) == -1){ 
   std::cout << " failed to setall semaphore" << std::endl;
   std::cout << strerror(errno) << std::endl;
    break;
  }    
}

What is wrong?

Answer 1

This worked.

if((temp_semid = semget(IPC_PRIVATE, 250, 0666 | IPC_CREAT)) != -1)
{    
  semun arg; 
  ushort array[100] = { 0 };
  arg.array = array;
  if(semctl(temp_semid, 0, SETALL, arg) == -1){ 
   std::cout << " failed to setall semaphore" << std::endl;
   std::cout << strerror(errno) << std::endl;
    break;
  }    
}

i was using memset in the wrong way. thanks to hmjd for pointing that out.