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# ptsname_r.m4 serial 4
dnl Copyright (C) 2010-2018 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_R],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
dnl Persuade glibc <stdlib.h> to declare ptsname_r().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([ptsname_r])
if test $ac_cv_func_ptsname_r = no; then
HAVE_PTSNAME_R=0
else
dnl On OSF/1 5.1, the type of the third argument is 'int', not 'size_t',
dnl and the declaration is missing if _REENTRANT is not defined.
AC_CACHE_CHECK([whether ptsname_r has the same signature as in glibc],
[gl_cv_func_ptsname_r_signature_ok],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stddef.h>
#include <stdlib.h>
/* Test whether ptsname_r is declared at all. */
int (*f) (int, char *, size_t) = ptsname_r;
/* Test whether it has the same declaration as in glibc. */
#undef ptsname_r
extern
#ifdef __cplusplus
"C"
#endif
int ptsname_r (int, char *, size_t);
]],
[[return f (0, NULL, 0);]])
],
[gl_cv_func_ptsname_r_signature_ok=yes],
[gl_cv_func_ptsname_r_signature_ok=no])
])
if test $gl_cv_func_ptsname_r_signature_ok = no; then
REPLACE_PTSNAME_R=1
fi
fi
AC_REQUIRE([AC_HEADER_MAJOR])
])
# Prerequisites of lib/ptsname.c.
AC_DEFUN([gl_PREREQ_PTSNAME_R], [
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether isatty sets errno when it fails],
[gl_cv_func_isatty_sets_errno],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <errno.h>
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
# include <io.h>
#else
# include <unistd.h>
#endif
]],
[[errno = 0;
isatty (-1);
return errno == 0;
]])
],
[gl_cv_func_isatty_sets_errno=yes],
[gl_cv_func_isatty_sets_errno=no],
[case "$host_os" in
irix* | solaris*)
gl_cv_func_isatty_sets_errno="guessing no" ;;
mingw*) # Guess yes on mingw, no on MSVC.
AC_EGREP_CPP([Known], [
#ifdef __MINGW32__
Known
#endif
],
[gl_cv_func_isatty_sets_errno="guessing yes"],
[gl_cv_func_isatty_sets_errno="guessing no"])
;;
*)
gl_cv_func_isatty_sets_errno="guessing yes" ;;
esac
])
])
case "$gl_cv_func_isatty_sets_errno" in
*yes) ;;
*)
AC_DEFINE([ISATTY_FAILS_WITHOUT_SETTING_ERRNO], [1],
[Define to 1 if isatty() may fail without setting errno.])
;;
esac
])
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