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# ptsname.m4 serial 9
dnl Copyright (C) 2010-2023 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([gl_FUNC_PTSNAME],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <stdlib.h> to declare ptsname().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS([ptsname])
if test $ac_cv_func_ptsname = no; then
HAVE_PTSNAME=0
else
AC_CACHE_CHECK([whether ptsname sets errno on failure],
[gl_cv_func_ptsname_sets_errno],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <errno.h>
]], [[
return ptsname (-1) || !errno;
]])],
[gl_cv_func_ptsname_sets_errno=yes],
[gl_cv_func_ptsname_sets_errno=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_ptsname_sets_errno="guessing yes" ;;
# Guess yes on musl systems.
*-musl*) gl_cv_func_ptsname_sets_errno="guessing yes" ;;
# Guess yes on systems that emulate the Linux system calls.
midipix*) gl_cv_func_ptsname_sets_errno="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_ptsname_sets_errno="$gl_cross_guess_normal" ;;
esac
])])
case $gl_cv_func_ptsname_sets_errno in
*no) REPLACE_PTSNAME=1 ;;
esac
fi
])
# Prerequisites of lib/ptsname.c.
AC_DEFUN([gl_PREREQ_PTSNAME], [
:
])
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