2 dnl Copyright (C) 2010-2020 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])
10 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
12 dnl Persuade glibc <stdlib.h> to declare ptsname().
13 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
15 AC_CHECK_FUNCS([ptsname])
16 if test $ac_cv_func_ptsname = no; then
19 AC_CACHE_CHECK([whether ptsname sets errno on failure],
20 [gl_cv_func_ptsname_sets_errno],
26 return ptsname (-1) || !errno;
28 [gl_cv_func_ptsname_sets_errno=yes],
29 [gl_cv_func_ptsname_sets_errno=no],
31 # Guess yes on glibc systems.
32 *-gnu* | gnu*) gl_cv_func_ptsname_sets_errno="guessing yes" ;;
33 # Guess yes on musl systems.
34 *-musl*) gl_cv_func_ptsname_sets_errno="guessing yes" ;;
35 # If we don't know, obey --enable-cross-guesses.
36 *) gl_cv_func_ptsname_sets_errno="$gl_cross_guess_normal" ;;
39 case $gl_cv_func_ptsname_sets_errno in
40 *no) REPLACE_PTSNAME=1 ;;
45 # Prerequisites of lib/ptsname.c.
46 AC_DEFUN([gl_PREREQ_PTSNAME], [