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:
Determine the number of bytes waiting in the output buffer of a stream.

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

Depends-on:

configure.ac:
gl_FUNC_FPENDING
if test $gl_cv_func___fpending = no; then
  AC_LIBOBJ([fpending])
fi

Makefile.am:

Include:
"fpending.h"

License:
GPL

Maintainer:
Jim Meyering