msgctl id, cmd, arg
msgctl system call, which is used to
perform different control operations on IPC message queues.
msgctl documentation on your system for details.
If cmd is
arg must be a
variable that will hold the returned
msqid_ds structure. The
return values work like those of
fnctl: 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
This function is available only on machines supporting System V IPC.require "ipc.ph"; require "msg.ph";