termios: Move isatty, __isatty_nostatus from io

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

The definition may depend on termios internals.

4 files changed, 65 insertions, 0 deletions

diff --git a/termios/Makefile b/termios/Makefile
index 3cbd8917ad..1e23608255 100644
--- a/termios/Makefile
+++ b/termios/Makefile
@@ -36,6 +36,8 @@ routines := \
   cfmakeraw \
   cfsetbaud \
   cfsetspeed \
+  isatty \
+  isatty_nostatus \
   speed \
   tcdrain \
   tcflow \
diff --git a/termios/Versions b/termios/Versions
index a5eec83257..03e2063b1f 100644
--- a/termios/Versions
+++ b/termios/Versions
@@ -3,6 +3,9 @@ libc {
     # c*
     cfgetispeed; cfgetospeed; cfmakeraw; cfsetispeed; cfsetospeed; cfsetspeed;
 
+    # i*
+    isatty;
+
     # t*
     tcdrain; tcflow; tcflush; tcgetattr; tcgetpgrp; tcsendbreak; tcsetattr;
     tcsetpgrp;
diff --git a/termios/isatty.c b/termios/isatty.c
new file mode 100644
index 0000000000..3f3912d8e5
--- /dev/null
+++ b/termios/isatty.c
@@ -0,0 +1,31 @@
+/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <unistd.h>
+
+/* Return 1 if FD is a terminal, 0 if not.  */
+int
+__isatty (int fd)
+{
+  __set_errno (ENOSYS);
+  return -1;
+}
+
+weak_alias (__isatty, isatty)
+
+stub_warning (isatty)
diff --git a/termios/isatty_nostatus.c b/termios/isatty_nostatus.c
new file mode 100644
index 0000000000..e8ee796f3b
--- /dev/null
+++ b/termios/isatty_nostatus.c
@@ -0,0 +1,29 @@
+/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <unistd.h>
+
+/* Return 1 if FD is a terminal, 0 if not, without changing errno  */
+int
+__isatty_nostatus (int fd)
+{
+  int save_errno = errno;
+  int res = __isatty (fd);
+  __set_errno (save_errno);
+  return res;
+}