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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<sys/shm.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <sys/shm.h> 
+.SH NAME
+sys/shm.h \- XSI shared memory facility
+.SH SYNOPSIS
+.LP
+\fB#include <sys/shm.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<sys/shm.h>\fP header shall define the following symbolic constants:
+.TP 7
+SHM_RDONLY
+Attach read-only (else read-write).
+.TP 7
+SHM_RND
+Round attach address to SHMLBA.
+.sp
+.LP
+The \fI<sys/shm.h>\fP header shall define the following symbolic value:
+.TP 7
+SHMLBA
+Segment low boundary address multiple.
+.sp
+.LP
+The following data types shall be defined through \fBtypedef\fP:
+.TP 7
+\fBshmatt_t\fP
+Unsigned integer used for the number of current attaches that must
+be able to store values at least as large as a type
+\fBunsigned short\fP.
+.sp
+.LP
+The \fBshmid_ds\fP structure shall contain the following members:
+.sp
+.RS
+.nf
+
+\fBstruct ipc_perm shm_perm  \fP Operation permission structure. \fB
+size_t          shm_segsz \fP Size of segment in bytes. \fB
+pid_t           shm_lpid  \fP Process ID of last shared memory operation. \fB
+pid_t           shm_cpid  \fP Process ID of creator. \fB
+shmatt_t        shm_nattch\fP Number of current attaches. \fB
+time_t          shm_atime \fP Time of last \fIshmat\fP
+ (). \fB
+time_t          shm_dtime \fP Time of last \fIshmdt\fP
+ (). \fB
+time_t          shm_ctime \fP Time of last change by \fIshmctl\fP
+ (). \fB
+\fP
+.fi
+.RE
+.LP
+The \fBpid_t\fP, \fBtime_t\fP, \fBkey_t\fP, and \fBsize_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
+
+\fBvoid *shmat(int, const void *, int);
+int   shmctl(int, int, struct shmid_ds *);
+int   shmdt(const void *);
+int   shmget(key_t, 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 , the System Interfaces volume
+of IEEE\ Std\ 1003.1-2001, \fIshmat\fP(), \fIshmctl\fP(), \fIshmdt\fP(),
+\fIshmget\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 .