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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SHMDT" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" shmdt 
+.SH NAME
+shmdt \- XSI shared memory detach operation
+.SH SYNOPSIS
+.LP
+\fB#include <sys/shm.h>
+.br
+.sp
+int shmdt(const void *\fP\fIshmaddr\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIshmdt\fP() 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 \fIRealtime\fP .
+.LP
+The \fIshmdt\fP() function detaches the shared memory segment located
+at the address specified by \fIshmaddr\fP from the
+address space of the calling process.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIshmdt\fP() shall decrement the value
+of \fIshm_nattch\fP in the data structure associated with
+the shared memory ID of the attached shared memory segment and return
+0.
+.LP
+Otherwise, the shared memory segment shall not be detached, \fIshmdt\fP()
+shall return -1, and \fIerrno\fP shall be set to
+indicate the error.
+.SH ERRORS
+.LP
+The \fIshmdt\fP() function shall fail if:
+.TP 7
+.B EINVAL
+The value of \fIshmaddr\fP is not the data segment start address of
+a shared memory segment.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The POSIX Realtime Extension defines alternative interfaces for interprocess
+communication. Application developers who need to
+use IPC should design their applications so that modules using the
+IPC routines described in \fIXSI Interprocess Communication\fP can
+be easily modified to use the alternative
+interfaces.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIXSI Interprocess Communication\fP , \fIRealtime\fP , \fIexec\fP()
+,
+\fIexit\fP() , \fIfork\fP() , \fIshmat\fP() , \fIshmctl\fP() , \fIshmget\fP()
+, \fIshm_open\fP() , \fIshm_unlink\fP() , the Base Definitions volume
+of IEEE\ Std\ 1003.1-2001, \fI<sys/shm.h>\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 .