SysV shared memory operations

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• shmctl ID,CMD,ARG

  Calls the System V IPC function shmctl. You'll probably have to say

   use IPC::SysV;
   

  first to get the correct constant definitions. If CMD is IPC_STAT,then ARG must be a variable that will hold the returned shmid_dsstructure. Returns like ioctl: undef for error; "0 buttrue" for zero; and the actual return value otherwise.See also SysV IPC in perlipc and IPC::SysV documentation.

  Portability issues: shmctl in perlport.