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SHMDT(P)			    POSIX Programmer's Manual				 SHMDT(P)

NAME
       shmdt - XSI shared memory detach operation

SYNOPSIS
       #include <sys/shm.h>

       int shmdt(const void *shmaddr);

DESCRIPTION
       The  shmdt()  function  operates  on XSI shared memory (see the Base Definitions volume of
       IEEE Std 1003.1-2001, Section 3.340, Shared Memory Object). It is unspecified whether this
       function  interoperates with the realtime interprocess communication facilities defined in
       Realtime .

       The shmdt() function detaches the shared memory segment located at the  address	specified
       by shmaddr from the address space of the calling process.

RETURN VALUE
       Upon  successful  completion,  shmdt() shall decrement the value of shm_nattch in the data
       structure associated with the shared memory ID of the attached shared memory  segment  and
       return 0.

       Otherwise,  the	shared memory segment shall not be detached, shmdt() shall return -1, and
       errno shall be set to indicate the error.

ERRORS
       The shmdt() function shall fail if:

       EINVAL The value of shmaddr is not the data segment start address of a shared memory  seg-
	      ment.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  POSIX  Realtime  Extension defines alternative interfaces for interprocess communica-
       tion. Application developers who need to use IPC should design their applications so  that
       modules	using  the IPC routines described in XSI Interprocess Communication can be easily
       modified to use the alternative interfaces.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       XSI Interprocess Communication , Realtime , exec() , exit() , fork() , shmat() ,  shmctl()
       ,   shmget()   ,   shm_open()   ,   shm_unlink()   ,   the   Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <sys/shm.h>

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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 SHMDT(P)
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