Remove isatty()

These functions are provided by Newlib since 2000.

Update #3409.

cpukit/Makefile.am

@@ -157,7 +157,6 @@ librtemscpu_a_SOURCES += libcsupport/src/__gettod.c
 librtemscpu_a_SOURCES += libcsupport/src/getuid.c
 librtemscpu_a_SOURCES += libcsupport/src/gxx_wrappers.c
 librtemscpu_a_SOURCES += libcsupport/src/ioctl.c
-librtemscpu_a_SOURCES += libcsupport/src/isatty.c
 librtemscpu_a_SOURCES += libcsupport/src/isatty_r.c
 librtemscpu_a_SOURCES += libcsupport/src/issetugid.c
 librtemscpu_a_SOURCES += libcsupport/src/kill_noposix.c

cpukit/configure.ac

@@ -66,7 +66,6 @@ AC_CHECK_FUNCS([isascii fileno])
 # <FIXME>
 #   Check for functions supplied by newlib >= 1.17.0
 # Newlib's posix/ directory
-AC_CHECK_FUNCS([isatty])
 AC_CHECK_FUNCS([creat \
   opendir closedir readdir rewinddir scandir seekdir \
   sleep \

cpukit/libcsupport/src/isatty.c

@@ -1,40 +0,0 @@
-/**
- *  @file
- *
- *  @brief Test whether a File Descriptor Refers to a Terminal 
- *  @ingroup libcsupport
- */
-
-/*
- *  COPYRIGHT (c) 1989-1999.
- *  On-Line Applications Research Corporation (OAR).
- *
- *  The license and distribution terms for this file may be
- *  found in the file LICENSE in this distribution or at
- *  http://www.rtems.org/license/LICENSE.
- */
-
-#if HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#ifndef HAVE_ISATTY
-
-#include <sys/stat.h>
-
-int isatty(
-  int fd
-)
-{
-  struct stat buf;
-
-  if (fstat (fd, &buf) < 0)
-    return 0;
-
-  if (S_ISCHR (buf.st_mode))
-    return 1;
-
-  return 0;
-}
-
-#endif