isatty: Make it return true in Cygwin consoles on native Windows. * lib/isatty.c: Include <string.h>. (GetProcAddress): New macro. (GetNamedPipeClientProcessIdFuncType): New type. (GetNamedPipeClientProcessIdFunc): New variable. (QueryFullProcessImageNameFuncType): New type. (QueryFullProcessImageNameFunc): New variable. (initialized): New variable. (initialize): New function. (IsCygwinConsoleHandle): New function. (isatty): Invoke it. * doc/posix-functions/isatty.texi: Mention the issue.

Description:
freadahead() function: Determine the number of bytes waiting in the input
buffer of a stream.

Files:
lib/freadahead.h
lib/freadahead.c
lib/stdio-impl.h
m4/freadahead.m4

Depends-on:

configure.ac:
gl_FUNC_FREADAHEAD
if test $ac_cv_func___freadahead = no; then
  AC_LIBOBJ([freadahead])
fi

Makefile.am:

Include:
"freadahead.h"

License:
LGPLv2+

Maintainer:
all