- 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_dsstructure. Returns like ioctl: the undefined value for error, "
0but true" for zero, or the actual return value otherwise. See also SysV IPC in perlipc and