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 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 perlipc/"SysV IPC", IPC::SysV, and IPC::Semaphore documentation.