Reference: msgctl
Author: Ellen Siever, Stephen Spainhour & Nathan Patwardhan
Date: 1999-07-02T01:36:28Z

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| Chapter 5 Function Reference |

## msgctl

    msgctl id, cmd, arg

Calls the `msgctl` system call, which is used to perform different control operations on IPC message queues. See the `msgctl` documentation on your system for details. If cmd is `&IPC_STAT`, then 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 should say:

>     require "ipc.ph";
>     require "msg.ph";

This function is available only on machines supporting System V IPC.

Reference: mkdir |  | Reference: msgget