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 that will hold the returned shmid_ds
structure. Returns like ioctl: undef
for error; "0
but true" for zero; and the actual return value otherwise. See also SysV IPC in perlipc and IPC::SysV
documentation.
Portability issues: shmctl in perlport.
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