1 files changed, 58 insertions, 0 deletions
diff --git a/gl/m4/termios_h.m4 b/gl/m4/termios_h.m4
new file mode 100644
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--- /dev/null
+++ b/gl/m4/termios_h.m4
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+# termios_h.m4 serial 7
+dnl Copyright (C) 2010-2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN_ONCE([gl_TERMIOS_H],
+[
+  dnl Ensure to expand the default settings once only, before all statements
+  dnl that occur in other macros.
+  AC_REQUIRE([gl_TERMIOS_H_DEFAULTS])
+
+  gl_CHECK_NEXT_HEADERS([termios.h])
+  if test $ac_cv_header_termios_h != yes; then
+    HAVE_TERMIOS_H=0
+  fi
+
+  dnl Ensure the type pid_t gets defined.
+  AC_REQUIRE([AC_TYPE_PID_T])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use, and which is not
+  dnl guaranteed by C89.
+  gl_WARN_ON_USE_PREPARE([[#include <termios.h>]],
+    [tcgetsid])
+])
+
+# gl_TERMIOS_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
+AC_DEFUN([gl_TERMIOS_MODULE_INDICATOR],
+[
+  dnl Ensure to expand the default settings once only.
+  gl_TERMIOS_H_REQUIRE_DEFAULTS
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+  dnl Define it also as a C macro, for the benefit of the unit tests.
+  gl_MODULE_INDICATOR_FOR_TESTS([$1])
+])
+
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd.  It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_TERMIOS_H_REQUIRE_DEFAULTS],
+[
+  m4_defun(GL_MODULE_INDICATOR_PREFIX[_TERMIOS_H_MODULE_INDICATOR_DEFAULTS], [
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TCGETSID])
+  ])
+  m4_require(GL_MODULE_INDICATOR_PREFIX[_TERMIOS_H_MODULE_INDICATOR_DEFAULTS])
+  AC_REQUIRE([gl_TERMIOS_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_TERMIOS_H_DEFAULTS],
+[
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_DECL_TCGETSID=1;   AC_SUBST([HAVE_DECL_TCGETSID])
+  HAVE_TERMIOS_H=1;       AC_SUBST([HAVE_TERMIOS_H])
+])