Calls the System V IPC function 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 that 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 SysV IPC in perlipc and the documentation for
Portability issues: msgctl in perlport.
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