msgget

Return message queue ID, possibly creating the queue

Declaration

Source position: ipc.pp line 656

function msgget(

key: TKey;

msgflg: cint

):cint;

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.

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

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