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+'\" et
+.TH sys_ipc.h "0P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+sys/ipc.h
+\(em XSI interprocess communication access structure
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/ipc.h>
+.fi
+.SH DESCRIPTION
+The
+.IR <sys/ipc.h> 
+header is used by three mechanisms for XSI interprocess communication
+(IPC):
+messages, semaphores, and shared memory. All use a common structure
+type,
+.BR ipc_perm ,
+to pass information used in determining permission to perform an IPC
+operation.
+.P
+The
+.IR <sys/ipc.h> 
+header shall define the
+.BR ipc_perm
+structure, which shall include the following members:
+.sp
+.RS 4
+.nf
+
+uid_t    uid    \fROwner's user ID.\fR
+gid_t    gid    \fROwner's group ID.\fR
+uid_t    cuid   \fRCreator's user ID.\fR
+gid_t    cgid   \fRCreator's group ID.\fR
+mode_t   mode   \fRRead/write permission.\fR
+.fi
+.P
+.RE
+.P
+The
+.IR <sys/ipc.h> 
+header shall define the
+.BR uid_t ,
+.BR gid_t ,
+.BR mode_t ,
+and
+.BR key_t
+types as described in
+.IR <sys/types.h> .
+.P
+The
+.IR <sys/ipc.h> 
+header shall define the following symbolic constants.
+.P
+Mode bits:
+.IP IPC_CREAT 12
+Create entry if key does not exist.
+.IP IPC_EXCL 12
+Fail if key exists.
+.IP IPC_NOWAIT 12
+Error if request must wait.
+.P
+Keys:
+.IP IPC_PRIVATE 12
+Private key.
+.P
+Control commands:
+.IP IPC_RMID 12
+Remove identifier.
+.IP IPC_SET 12
+Set options.
+.IP IPC_STAT 12
+Get options.
+.P
+The following shall be declared as a function and may also be defined
+as a macro. A function prototype shall be provided.
+.sp
+.RS 4
+.nf
+
+key_t  ftok(const char *, int);
+.fi
+.P
+.RE
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fB<sys_types.h>\fP"
+.P
+The System Interfaces volume of POSIX.1\(hy2017,
+.IR "\fIftok\fR\^(\|)"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .