2 dnl Copyright (C) 2010-2014 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_PTSNAME],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
11 dnl Persuade glibc <stdlib.h> to declare ptsname().
12 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
14 AC_CHECK_FUNCS([ptsname])
15 if test $ac_cv_func_ptsname = no; then
18 AC_CACHE_CHECK([whether ptsname sets errno on failure],
19 [gl_cv_func_ptsname_sets_errno],
21 [AC_LANG_PROGRAM([[#include <errno.h>
23 return ptsname (-1) || !errno;
25 [gl_cv_func_ptsname_sets_errno=yes],
26 [gl_cv_func_ptsname_sets_errno=no],
28 # Guess yes on glibc systems.
29 *-gnu*) gl_cv_func_ptsname_sets_errno="guessing yes" ;;
30 # If we don't know, assume the worst.
31 *) gl_cv_func_ptsname_sets_errno="guessing no" ;;
34 case $gl_cv_func_ptsname_sets_errno in
35 *no) REPLACE_PTSNAME=1 ;;
40 # Prerequisites of lib/ptsname.c.
41 AC_DEFUN([gl_PREREQ_PTSNAME], [