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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<sys/msg.h>" 0P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <sys/msg.h> 
+.SH NAME
+sys/msg.h \- XSI message queue structures
+.SH SYNOPSIS
+.LP
+\fB#include <sys/msg.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<sys/msg.h>\fP header shall define the following data types
+through \fBtypedef\fP:
+.TP 7
+\fBmsgqnum_t\fP
+Used for the number of messages in the message queue.
+.TP 7
+\fBmsglen_t\fP
+Used for the number of bytes allowed in a message queue.
+.sp
+.LP
+These types shall be unsigned integer types that are able to store
+values at least as large as a type \fBunsigned short\fP.
+.LP
+The \fI<sys/msg.h>\fP header shall define the following constant as
+a message operation flag:
+.TP 7
+MSG_NOERROR
+No error if big message.
+.sp
+.LP
+The \fBmsqid_ds\fP structure shall contain the following members:
+.sp
+.RS
+.nf
+
+\fBstruct ipc_perm msg_perm  \fP Operation permission structure. \fB
+msgqnum_t       msg_qnum  \fP Number of messages currently on queue. \fB
+msglen_t        msg_qbytes\fP Maximum number of bytes allowed on queue. \fB
+pid_t           msg_lspid \fP Process ID of last \fImsgsnd\fP
+ (). \fB
+pid_t           msg_lrpid \fP Process ID of last \fImsgrcv\fP
+ (). \fB
+time_t          msg_stime \fP Time of last \fImsgsnd\fP
+ (). \fB
+time_t          msg_rtime \fP Time of last \fImsgrcv\fP
+ (). \fB
+time_t          msg_ctime \fP Time of last change. \fB
+\fP
+.fi
+.RE
+.LP
+The \fBpid_t\fP, \fBtime_t\fP, \fBkey_t\fP, \fBsize_t\fP, and \fBssize_t\fP
+types shall be defined as described in \fI<sys/types.h>\fP .
+.LP
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS
+.nf
+
+\fBint       msgctl(int, int, struct msqid_ds *);
+int       msgget(key_t, int);
+ssize_t   msgrcv(int, void *, size_t, long, int);
+int       msgsnd(int, const void *, size_t, int);
+\fP
+.fi
+.RE
+.LP
+In addition, all of the symbols from \fI<sys/ipc.h>\fP shall be defined
+when
+this header is included.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<sys/ipc.h>\fP, \fI<sys/types.h>\fP, \fImsgctl\fP(), \fImsgget\fP(),
+\fImsgrcv\fP(), \fImsgsnd\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 .