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Perl in a Nutshell

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Function Reference
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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:

require "ipc.ph";
require "shm.ph";
This function is available only on machines supporting System V IPC.

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Reference: shiftBook IndexReference: shmget