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Q: 

shmat() sending signal 11

Please let me know when a call to shmat function can raise a signal 11.

  if ((shmId=shmget(shmKey, 0, 0)) <= 0)  {
     printf( "shmget(0x%x)", shmKey);
     return 0;
  }

  printf( "queueOpen - Key 0x%x gives ID %d", shmKey, shmId);

  qh = shmat(shmId, 0, SHM_RND);

I am getting a signal 11 by the code above. Please help

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