[Overview][Constants][Types][Procedures and functions][Index] | Reference for unit 'ipc' (#rtl)

# msgget

Return message queue ID, possibly creating the queue

## Declaration

Source position: ipc.pp line 656

`function msgget(`
`key: TKey;`
`msgflg: cint`
`):cint;`

## Description

msgget returns the ID of the message queue described by key. Depending on the flags in msgflg, a new queue is created.

msgflg can have one or more of the following values (combined by ORs):

IPC_CREAT
  The queue is created if it doesn't already exist.
IPC_EXCL
  If used in combination with IPC_CREAT, causes the call to fail if the queue already exists. It cannot be used by itself.

Optionally, the flags can be ORed with a permission mode, which is the same mode that can be used in the file system.

For an example, see msgctl.

## Errors

On error, -1 is returned, and IPCError is set.

## See also

ftok |  | Create token from filename
msgsnd |  | Send a message to the message queue
msgrcv |  | Retrieve a message from the queue
msgctl |  | Perform various operations on a message queue