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SHMDT
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
Return to Main Contents
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
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 segment.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
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 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 original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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