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.