shmctl id , cmd , arg
Calls the System V IPC system call,
shmctl(2)
, for performing operations on shared memory segments. If
cmd
is
&IPC_STAT
, then
arg
must be a variable that will hold the returned
shmid_ds
structure. The function returns like
ioctl
: 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:
This function is available only on machines supporting System V IPC.require "ipc.ph"; require "shm.ph";
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