(flex.info.gz) Why do flex scanners call fileno if it is not ANSI compatible?

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 Why do flex scanners call fileno if it is not ANSI compatible?
 ==============================================================
 
 Flex scanners call `fileno()' in order to get the file descriptor
 corresponding to `yyin'. The file descriptor may be passed to
 `isatty()' or `read()', depending upon which `%options' you specified.
 If your system does not have `fileno()' support, to get rid of the
 `read()' call, do not specify `%option read'. To get rid of the
 `isatty()' call, you must specify one of `%option always-interactive' or
 `%option never-interactive'.
 

Info Catalog

(flex.info.gz) How do I expand backslash-escape sequences in C-style quoted strings?

(flex.info.gz) FAQ

(flex.info.gz) Does flex support recursive pattern definitions?