Calls the System
msgctl(2). You'll probably have to say
first to get the correct constant definitions. If
CMD is IPC_STAT, then
ARG must be a variable which will hold the returned msqid_ds
structure. Returns like ioctl(): the undefined value for error, ``0 but true'' for zero, or the actual return value otherwise. See also
IPC::SysV and IPC::Semaphore::Msg documentation.
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--Tom Christiansen, Perl Documentation Compiler and Editor