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