Calls the System V IPC function shmctl. You'll probably have to say
first to get the correct constant definitions. If CMD is
IPC_STAT , then ARG must be a variable that will hold the returned
shmid_ds structure. Returns like ioctl:
undef for error; "
0 but true" for zero; and the actual return value otherwise. See also SysV IPC in perlipc and
Portability issues: shmctl in perlport.
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