1 files changed, 20 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/lib/isatty.c b/mdk-stage1/dietlibc/lib/isatty.c
new file mode 100644
index 000000000..b31609720
--- /dev/null
+++ b/mdk-stage1/dietlibc/lib/isatty.c
@@ -0,0 +1,20 @@
+#define ioctl libc_ioctl
+#include <termios.h>
+#undef ioctl
+#include <sys/ioctl.h>
+
+extern int errno;
+
+int isatty(int fd)
+{
+  int save;
+  int is_tty;
+  struct termios term;
+
+  save = errno;
+  is_tty = ioctl(fd, TCGETS, &term) == 0;
+  errno = save;
+
+  return is_tty;
+}
+