msgget man page on BSDOS

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MSGGET(2)		    BSD 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 mes-
     sage 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 initial-
     ized 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 re-
     turned.  Otherwise, -1 is returned and the global variable errno is set
     to indicate the error.

ERRORS
     [EACESS]	   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 mes-
		   sage 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 asso-
		   ciated with key was found.

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

4th Berkeley Distribution	 July 3, 1996				     1
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