shmctl

See the current Perl documentation for shmctl.

Here is our local, out-dated (pre-5.6) version:

shmctl - SysV shared memory operations

shmctl ID,CMD,ARG

Calls the System V IPC function shmctl. 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 shmid_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 documentation.