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.

#!/bin/sh

# Test set-mode-acl on the file system of /var/tmp, which usually is a local
# file system.

. "${srcdir=.}/init.sh"; path_prepend_ .

if test -d /var/tmp; then
  TMPDIR=/var/tmp
else
  TMPDIR=/tmp
fi
test -d $TMPDIR || Exit 77
export TMPDIR

$BOURNE_SHELL "${srcdir}/test-set-mode-acl.sh"

Exit $?