msgctl(2).
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 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.