- 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_dsstructure. 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.