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

Replenish the input buffer with data obtained from the file descriptor, and return the next character of input (or eof if no input is available). Note that in windows text mode, `\r ` sequences on the device will be translated to ` `s.

== Synopsis

Declared in `<bdls_fdstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
int_type
underflow() override;
----


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