msgget man page on OpenBSD

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MSGGET(2)		  OpenBSD Programmer's Manual		     MSGGET(2)

NAME
     msgget - get message queue

SYNOPSIS
     #include <sys/types.h>
     #include <sys/ipc.h>
     #include <sys/msg.h>

     int
     msgget(key_t key, int msgflg);

DESCRIPTION
     msgget() returns the message queue identifier associated with key.	 A
     message queue identifier is a unique integer greater than zero.

     A message queue is created if either key is equal to IPC_PRIVATE, or key
     does not have a message queue identifier associated with it, and the
     IPC_CREAT bit is set in msgflg.

     If a new message queue is created, the data structure associated with it
     (the msqid_ds structure, see msgctl(2)) is initialized as follows:

     o	 msg_perm.cuid and msg_perm.uid are set to the effective UID of the
	 calling process.

     o	 msg_perm.gid and msg_perm.cgid are set to the effective GID of the
	 calling process.

     o	 msg_perm.mode is set to the lower 9 bits of msgflg.

     o	 msg_cbytes, msg_qnum, msg_lspid, msg_lrpid, msg_rtime, and msg_stime
	 are set to 0.

     o	 msg_qbytes is set to the system wide maximum value for the number of
	 bytes in a queue (MSGMNB).

     o	 msg_ctime is set to the current time.

RETURN VALUES
     Upon successful completion a positive message queue identifier is
     returned.	Otherwise, -1 is returned and the global variable errno is set
     to indicate the error.

ERRORS
     [EACCES]	   A message queue is already associated with key and the
		   caller has no permission to access it.

     [EEXIST]	   Both IPC_CREAT and IPC_EXCL are set in msgflg, and a
		   message queue is already associated with key.

     [ENOSPC]	   A new message queue could not be created because the system
		   limit for the number of message queues has been reached.

     [ENOENT]	   IPC_CREAT was not set in msgflg and no message queue
		   associated with key was found.

SEE ALSO
     msgctl(2), msgrcv(2), msgsnd(2), ftok(3)

HISTORY
     Message queues appeared in the first release of AT&T Unix System V.

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9
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