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:
Reading symbolic links without size limitation, relative to fd.

Files:
lib/areadlink.h
lib/areadlinkat.c
lib/at-func.c

Depends-on:
areadlink
careadlinkat
readlinkat
at-internal
dosname
errno
extensions
fchdir
fcntl-h
openat-die
openat-h
save-cwd

configure.ac:
gl_MODULE_INDICATOR([areadlinkat])

Makefile.am:
lib_SOURCES += areadlinkat.c

Include:
"areadlink.h"

License:
GPL

Maintainer:
Jim Meyering, Eric Blake