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RocketLink!--> Man page versions: OpenBSD FreeBSD NetBSD RedHat Others

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

     msgget - get message queue

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

     msgget(key_t key, int msgflg);

     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 initialized as follows:

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

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

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

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

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

     -   msg_ctime is set to the current time.

     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.

     [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 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.

     msgctl(2),  msgrcv(2),  msgsnd(2)

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

OpenBSD 2.6                     August 17, 1995                              1

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]

[Overview Topics]

Up to: Local Process Communication - Communication between processes running on the same system. Synchronization. File locking. Signals. FIFOs, pipes, et al

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