msgctlID,CMD,ARG
This function calls the
msgctl
(2) system call.
See
msgctl
(2) for details.
If
CMD
is
&IPC_STAT
, then
ARG
must be a
variable that will hold the returned
msqid_ds
structure. The
return value works like
ioctl
's: the undefined value for error,
"
0 but true
" for zero, or the actual return value otherwise.
On error, it puts the error code into
$!
. Before calling, you
should say:
require "ipc.ph"; require "msg.ph";
This function is available only on machines supporting System V IPC, which turns out to be far fewer than those supporting sockets.
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