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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MSGGET" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" msgget 
+.SH NAME
+msgget \- get the XSI message queue identifier
+.SH SYNOPSIS
+.LP
+\fB#include <sys/msg.h>
+.br
+.sp
+int msgget(key_t\fP \fIkey\fP\fB, int\fP \fImsgflg\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fImsgget\fP() function operates on XSI message queues (see the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+Section 3.224, Message Queue). It is unspecified whether this function
+interoperates with the realtime interprocess communication facilities
+defined in \fIRealtime\fP .
+.LP
+The \fImsgget\fP() function shall return the message queue identifier
+associated with the argument \fIkey\fP.
+.LP
+A message queue identifier, associated message queue, and data structure
+(see \fI<sys/msg.h>\fP), shall be created for the argument \fIkey\fP
+if one of the following is
+true:
+.IP " *" 3
+The argument \fIkey\fP is equal to IPC_PRIVATE.
+.LP
+.IP " *" 3
+The argument \fIkey\fP does not already have a message queue identifier
+associated with it, and (\fImsgflg\fP & IPC_CREAT)
+is non-zero.
+.LP
+.LP
+Upon creation, the data structure associated with the new message
+queue identifier shall be initialized as follows:
+.IP " *" 3
+\fBmsg_perm.cuid\fP, \fBmsg_perm.uid\fP, \fBmsg_perm.cgid\fP, and
+\fBmsg_perm.gid\fP shall be set equal to the effective
+user ID and effective group ID, respectively, of the calling process.
+.LP
+.IP " *" 3
+The low-order 9 bits of \fBmsg_perm.mode\fP shall be set equal to
+the low-order 9 bits of \fImsgflg\fP.
+.LP
+.IP " *" 3
+\fBmsg_qnum\fP, \fBmsg_lspid\fP, \fBmsg_lrpid\fP, \fBmsg_stime\fP,
+and \fBmsg_rtime\fP shall be set equal to 0.
+.LP
+.IP " *" 3
+\fBmsg_ctime\fP shall be set equal to the current time.
+.LP
+.IP " *" 3
+\fBmsg_qbytes\fP shall be set equal to the system limit.
+.LP
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fImsgget\fP() shall return a non-negative
+integer, namely a message queue identifier. Otherwise,
+it shall return -1 and set \fIerrno\fP to indicate the error.
+.SH ERRORS
+.LP
+The \fImsgget\fP() function shall fail if:
+.TP 7
+.B EACCES
+A message queue identifier exists for the argument \fIkey\fP, but
+operation permission as specified by the low-order 9 bits of
+\fImsgflg\fP would not be granted; see \fIXSI Interprocess Communication\fP
+\&.
+.TP 7
+.B EEXIST
+A message queue identifier exists for the argument \fIkey\fP but ((\fImsgflg\fP
+& IPC_CREAT) && (\fImsgflg\fP
+& IPC_EXCL)) is non-zero.
+.TP 7
+.B ENOENT
+A message queue identifier does not exist for the argument \fIkey\fP
+and (\fImsgflg\fP & IPC_CREAT) is 0.
+.TP 7
+.B ENOSPC
+A message queue identifier is to be created but the system-imposed
+limit on the maximum number of allowed message queue
+identifiers system-wide would be exceeded.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The POSIX Realtime Extension defines alternative interfaces for interprocess
+communication (IPC). Application developers who
+need to use IPC should design their applications so that modules using
+the IPC routines described in \fIXSI Interprocess Communication\fP
+can be easily modified to use the alternative
+interfaces.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIXSI Interprocess Communication\fP , \fIRealtime\fP , \fImq_close\fP()
+, \fImq_getattr\fP() , \fImq_notify\fP() , \fImq_open\fP() , \fImq_receive\fP()
+, \fImq_send\fP() , \fImq_setattr\fP() , \fImq_unlink\fP() , \fImsgctl\fP()
+, \fImsgrcv\fP() ,
+\fImsgsnd\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<sys/msg.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .