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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<sys/ipc.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <sys/ipc.h> 
+.SH NAME
+sys/ipc.h \- XSI interprocess communication access structure
+.SH SYNOPSIS
+.LP
+\fB#include <sys/ipc.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<sys/ipc.h>\fP header is used by three mechanisms for XSI interprocess
+communication (IPC): messages, semaphores,
+and shared memory. All use a common structure type, \fBipc_perm\fP,
+to pass information used in determining permission to perform
+an IPC operation.
+.LP
+The \fBipc_perm\fP structure shall contain the following members:
+.sp
+.RS
+.nf
+
+\fBuid_t    uid   \fP Owner's user ID. \fB
+gid_t    gid   \fP Owner's group ID. \fB
+uid_t    cuid  \fP Creator's user ID. \fB
+gid_t    cgid  \fP Creator's group ID. \fB
+mode_t   mode  \fP Read/write permission. \fB
+\fP
+.fi
+.RE
+.LP
+The \fBuid_t\fP, \fBgid_t\fP, \fBmode_t\fP, and \fBkey_t\fP types
+shall be defined as described in \fI<sys/types.h>\fP .
+.LP
+Definitions shall be provided for the following constants:
+.LP
+Mode bits:
+.TP 7
+IPC_CREAT
+Create entry if key does not exist.
+.TP 7
+IPC_EXCL
+Fail if key exists.
+.TP 7
+IPC_NOWAIT
+Error if request must wait.
+.sp
+.LP
+Keys:
+.TP 7
+IPC_PRIVATE
+Private key.
+.sp
+.LP
+Control commands:
+.TP 7
+IPC_RMID
+Remove identifier.
+.TP 7
+IPC_SET
+Set options.
+.TP 7
+IPC_STAT
+Get options.
+.sp
+.LP
+The following shall be declared as a function and may also be defined
+as a macro. A function prototype shall be provided.
+.sp
+.RS
+.nf
+
+\fBkey_t  ftok(const char *, int);
+\fP
+.fi
+.RE
+.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/types.h>\fP , the System Interfaces volume of
+IEEE\ Std\ 1003.1-2001, \fIftok\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 .