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key_t ftok(const char *pathname, int proj_id);

 $file_shmem = "/tmp/IPC/shared_memory1";
 $size_shmem = 18640;
...
  $idshm = shmget( $ipckey, $size_shmem, 0666  ) || die "\n Creation o
+f shared memory failed $! \n";
  print "IPC-SHMEM: id $idshm \n";
  shmread( $idshm, $data_shmem, 0, $size_shmem )  || warn "\n\n Error 
+reading shared-memory: $! \n";