[#BloombergLP-bdls-FdStreamBuf-xsgetn]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdls.adoc[bdls]::xref:BloombergLP/bdls/FdStreamBuf.adoc[FdStreamBuf]::xsgetn
:relfileprefix: ../../../
:mrdocs:

Read up to the specified `numBytes` characters from the file descriptor into the specified `buffer` and return the number of characters successfully read. The behavior is undefined unless `buffer` is at least `numBytes` bytes long. Note that on a Windows text file, a `\r ` in the file will be read as `
` (counting as a single character).

== Synopsis

Declared in `<bdls_fdstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::streamsize
xsgetn(
    char* buffer,
    std::streamsize numBytes) override;
----


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