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+'\" et
+.TH SHMDT "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH 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.
+.\"
+.SH NAME
+shmdt
+\(em XSI shared memory detach operation
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/shm.h>
+.P
+int shmdt(const void *\fIshmaddr\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIshmdt\fR()
+function operates on XSI shared memory (see the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 3.346" ", " "Shared Memory Object").
+It is unspecified whether this function interoperates with the
+realtime interprocess communication facilities defined in
+.IR "Section 2.8" ", " "Realtime".
+.P
+The
+\fIshmdt\fR()
+function detaches the shared memory segment located at the address
+specified by
+.IR shmaddr
+from the address space of the calling process.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIshmdt\fR()
+shall decrement the value of
+.IR shm_nattch
+in the data structure associated with the shared memory ID of the
+attached shared memory segment and return 0. Also, the
+.IR shm_dtime
+timestamp shall be set to the current time, as described in
+.IR "Section 2.7.1" ", " "IPC General Description".
+.P
+Otherwise, the shared memory segment shall not be detached,
+\fIshmdt\fR()
+shall return \-1, and
+.IR errno
+shall be set to indicate the error.
+.SH ERRORS
+The
+\fIshmdt\fR()
+function shall fail if:
+.TP
+.BR EINVAL
+The value of
+.IR shmaddr
+is not the data segment start address of a shared memory segment.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "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
+.IR "Section 2.7" ", " "XSI Interprocess Communication"
+can be easily modified to use the alternative interfaces.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.7" ", " "XSI Interprocess Communication",
+.IR "Section 2.8" ", " "Realtime",
+.IR "\fIexec\fR\^",
+.IR "\fIexit\fR\^(\|)",
+.IR "\fIfork\fR\^(\|)",
+.IR "\fIshmat\fR\^(\|)",
+.IR "\fIshmctl\fR\^(\|)",
+.IR "\fIshmget\fR\^(\|)",
+.IR "\fIshm_open\fR\^(\|)",
+.IR "\fIshm_unlink\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 3.346" ", " "Shared Memory Object",
+.IR "\fB<sys_shm.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .