1 files changed, 10 insertions, 3 deletions
diff --git a/newlib/libc/posix/isatty.c b/newlib/libc/posix/isatty.c
index afd5ec85e..2732ca2a0 100644
--- a/newlib/libc/posix/isatty.c
+++ b/newlib/libc/posix/isatty.c
@@ -1,10 +1,17 @@
 /* isatty.c */
 
-#include <unistd.h>
-#include <reent.h>
+/* Dumb implementation so programs will at least run.  */
+
+#include <sys/stat.h>
 
 int
 _DEFUN(isatty, (fd), int fd)
 {
-  return _isatty (fd);
+  struct stat buf;
+
+  if (fstat (fd, &buf) < 0)
+    return 0;
+  if (S_ISCHR (buf.st_mode))
+    return 1;
+  return 0;
 }