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<sys/shm.h>(P)		   POSIX Programmer's Manual		<sys/shm.h>(P)

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.

NAME
       sys/shm.h - XSI shared memory facility

SYNOPSIS
       #include <sys/shm.h>

DESCRIPTION
       The <sys/shm.h> header shall define the following symbolic constants:

       SHM_RDONLY
	      Attach read-only (else read-write).

       SHM_RND
	      Round attach address to SHMLBA.

       The <sys/shm.h> header shall define the following symbolic value:

       SHMLBA Segment low boundary address multiple.

       The following data types shall be defined through typedef:

       shmatt_t
	      Unsigned integer used for the number of  current	attaches  that
	      must  be	able  to  store	 values	 at  least  as large as a type
	      unsigned short.

       The shmid_ds structure shall contain the following members:

	      struct ipc_perm shm_perm	 Operation permission structure.
	      size_t	      shm_segsz	 Size of segment in bytes.
	      pid_t	      shm_lpid	 Process ID of last shared memory operation.
	      pid_t	      shm_cpid	 Process ID of creator.
	      shmatt_t	      shm_nattch Number of current attaches.
	      time_t	      shm_atime	 Time of last shmat
	       ().
	      time_t	      shm_dtime	 Time of last shmdt
	       ().
	      time_t	      shm_ctime	 Time of last change by shmctl
	       ().

       The pid_t,  time_t,  key_t,  and	 size_t	 types	shall  be  defined  as
       described in <sys/types.h> .

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

	      void *shmat(int, const void *, int);
	      int   shmctl(int, int, struct shmid_ds *);
	      int   shmdt(const void *);
	      int   shmget(key_t, size_t, int);

       In addition, all of the symbols from <sys/ipc.h> shall be defined  when
       this header is included.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <sys/ipc.h>   ,	 <sys/types.h>	,  the	System	Interfaces  volume  of
       IEEE Std 1003.1-2001, shmat(), shmctl(), shmdt(), shmget()

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 .

IEEE/The Open Group		     2003			<sys/shm.h>(P)
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