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# login_tty.m4
# serial 3
dnl Copyright (C) 2010-2025 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.
dnl This file is offered as-is, without any warranty.
AC_DEFUN([gl_FUNC_LOGIN_TTY],
[
AC_REQUIRE([gl_PTY_LIB])
AC_CHECK_HEADERS_ONCE([utmp.h util.h libutil.h termios.h])
gl_saved_libs="$LIBS"
LIBS="$LIBS $PTY_LIB"
gl_CHECK_FUNCS_ANDROID([login_tty], [[
#include <sys/types.h>
#if HAVE_UTMP_H
# include <utmp.h>
#endif
#if HAVE_UTIL_H
# include <util.h>
#elif HAVE_LIBUTIL_H
# include <libutil.h>
#elif HAVE_TERMIOS_H
# include <termios.h>
#endif
]])
LIBS="$gl_saved_LIBS"
if test $ac_cv_func_login_tty = no; then
HAVE_LOGIN_TTY=0
case "$gl_cv_onwards_func_login_tty" in
future*) REPLACE_LOGIN_TTY=1 ;;
esac
fi
])
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