[#BloombergLP-bdls-FdStreamBuf_FileHandler-unmap]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdls.adoc[bdls]::xref:BloombergLP/bdls/FdStreamBuf_FileHandler.adoc[FdStreamBuf_FileHandler]::unmap
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Unmap the section of memory beginning at the specified `mappedMemory`, having the specified `length`. The behavior is undefined unless `mappedMemory` is an address returned by a previous call to the `mmap` method and `length` was the `length` specified in that call.

== Synopsis

Declared in `<bdls_fdstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
unmap(
    void* mappedMemory,
    std::streamoff length);
----


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