1 # ptsname_r.m4 serial 5
2 dnl Copyright (C) 2010-2018 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_R],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
11 dnl Persuade glibc <stdlib.h> to declare ptsname_r().
12 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
14 AC_CHECK_FUNCS_ONCE([ptsname_r])
15 if test $ac_cv_func_ptsname_r = no; then
18 dnl On OSF/1 5.1, the type of the third argument is 'int', not 'size_t',
19 dnl and the declaration is missing if _REENTRANT is not defined.
20 AC_CACHE_CHECK([whether ptsname_r has the same signature as in glibc],
21 [gl_cv_func_ptsname_r_signature_ok],
26 /* Test whether ptsname_r is declared at all. */
27 int (*f) (int, char *, size_t) = ptsname_r;
28 /* Test whether it has the same declaration as in glibc. */
34 int ptsname_r (int, char *, size_t);
36 [[return f (0, NULL, 0);]])
38 [gl_cv_func_ptsname_r_signature_ok=yes],
39 [gl_cv_func_ptsname_r_signature_ok=no])
41 if test $gl_cv_func_ptsname_r_signature_ok = no; then
46 AC_REQUIRE([AC_HEADER_MAJOR])
49 # Prerequisites of lib/ptsname.c.
50 AC_DEFUN([gl_PREREQ_PTSNAME_R], [
51 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
52 AC_CACHE_CHECK([whether isatty sets errno when it fails],
53 [gl_cv_func_isatty_sets_errno],
57 #if defined _WIN32 && ! defined __CYGWIN__
68 [gl_cv_func_isatty_sets_errno=yes],
69 [gl_cv_func_isatty_sets_errno=no],
72 gl_cv_func_isatty_sets_errno="guessing no" ;;
73 mingw*) # Guess yes on mingw, no on MSVC.
74 AC_EGREP_CPP([Known], [
79 [gl_cv_func_isatty_sets_errno="guessing yes"],
80 [gl_cv_func_isatty_sets_errno="guessing no"])
83 gl_cv_func_isatty_sets_errno="guessing yes" ;;
87 case "$gl_cv_func_isatty_sets_errno" in
90 AC_DEFINE([ISATTY_FAILS_WITHOUT_SETTING_ERRNO], [1],
91 [Define to 1 if isatty() may fail without setting errno.])