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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MUNMAP" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" munmap 
+.SH NAME
+munmap \- unmap pages of memory
+.SH SYNOPSIS
+.LP
+\fB#include <sys/mman.h>
+.br
+.sp
+int munmap(void *\fP\fIaddr\fP\fB, size_t\fP \fIlen\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fImunmap\fP() function shall remove any mappings for those entire
+pages containing any part of the address space of the
+process starting at \fIaddr\fP and continuing for \fIlen\fP bytes.
+Further references to these pages shall result in the
+generation of a SIGSEGV signal to the process. If there are no mappings
+in the specified address range, then \fImunmap\fP() has no
+effect.
+.LP
+The implementation shall require that \fIaddr\fP be a multiple of
+the page size {PAGESIZE}.
+.LP
+If a mapping to be removed was private, any modifications made in
+this address range shall be discarded.
+.LP
+Any memory locks (see \fImlock\fP() and \fImlockall\fP() ) associated
+with
+this address range shall be removed, as if by an appropriate call
+to \fImunlock\fP(). 
+.LP
+If a mapping removed from a typed memory object causes the corresponding
+address range of the memory pool to be inaccessible by any
+process in the system except through allocatable mappings (that is,
+mappings of typed memory objects opened with the
+POSIX_TYPED_MEM_MAP_ALLOCATABLE flag), then that range of the memory
+pool shall become deallocated and may become available to
+satisfy future typed memory allocation requests.
+.LP
+A mapping removed from a typed memory object opened with the POSIX_TYPED_MEM_MAP_ALLOCATABLE
+flag shall not affect in any way
+the availability of that typed memory for allocation. 
+.LP
+The behavior of this function is unspecified if the mapping was not
+established by a call to \fImmap\fP().
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fImunmap\fP() shall return 0; otherwise,
+it shall return -1 and set \fIerrno\fP to indicate the
+error.
+.SH ERRORS
+.LP
+The \fImunmap\fP() function shall fail if:
+.TP 7
+.B EINVAL
+Addresses in the range [\fIaddr\fP,\fIaddr\fP+\fIlen\fP) are outside
+the valid range for the address space of a
+process.
+.TP 7
+.B EINVAL
+The \fIlen\fP argument is 0.
+.TP 7
+.B EINVAL
+The \fIaddr\fP argument is not a multiple of the page size as returned
+by \fIsysconf\fP().
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fImunmap\fP() function is only supported if the Memory Mapped
+Files option or the Shared Memory Objects option is
+supported.
+.SH RATIONALE
+.LP
+The \fImunmap\fP() function corresponds to SVR4, just as the \fImmap\fP()
+function
+does.
+.LP
+It is possible that an application has applied process memory locking
+to a region that contains shared memory. If this has
+occurred, the \fImunmap\fP() call ignores those locks and, if necessary,
+causes those locks to be removed.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fImlock\fP() , \fImlockall\fP() , \fImmap\fP()
+, \fIposix_typed_mem_open\fP() , \fIsysconf\fP() , the Base
+Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<signal.h>\fP, \fI<sys/mman.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 .