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/Perl 5.20

msgctl

msgctl ID,CMD,ARG

Calls the System V IPC function 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 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 IPC::SysV and IPC::Semaphore .

Portability issues: msgctl in perlport.

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http://perldoc.perl.org/5.20.2/functions/msgctl.html