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# gnupg-ttyname.m4
# Copyright (C) 2010-2012 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
#
# This file is based on gnulib/m4/ttyname_r.m4 serial 8.
#
# gnupg_REPLACE_TTYNAME_R
#
# This macro is an extended version of AC_REPLACE_FUNCS(ttyname_r).
# It takes peculiarities in the implementation of ttyname_r in account.
#
# The macro HAVE_TTYNAME_R will be defined to 1 if the function
# exists; it will be defined to 0 if it does not exists or no
# declaration is available.
#
# The macro HAVE_POSIXDECL_TTYNAME_R is defined if ttyname_r conforms
# to the Posix declaration.
#
# The macro HAVE_BROKEN_TTYNAME_R is defined it ttyname_r does not work
# correctly with the supplied buffer size. If this is defined the function
# will also be replaced.
#
# The macro REPLACE_TTYNAME_R is defined if ttyname_r is a replacement
# function. This macro is useful for the definition of the prototype.
#
# If the macro "have_android_system" has a value of "yes", ttyname_r
# will also be replaced by our own function.
#
AC_DEFUN([gnupg_REPLACE_TTYNAME_R],
[
AC_CHECK_HEADERS([unistd.h])
AC_CHECK_DECLS_ONCE([ttyname_r])
if test $ac_cv_have_decl_ttyname_r = no; then
HAVE_DECL_TTYNAME_R=0
fi
AC_CHECK_FUNCS([ttyname_r])
if test $ac_cv_func_ttyname_r = no; then
HAVE_TTYNAME_R=0
AC_LIBOBJ([ttyname_r])
AC_DEFINE([REPLACE_TTYNAME_R],[1],
[Define to 1 if ttyname_r is a replacement function.])
else
HAVE_TTYNAME_R=1
dnl On MacOS X 10.4 (and Solaris 10 without __EXTENSIONS__)
dnl the return type is 'char *', not 'int'.
AC_CACHE_CHECK([whether ttyname_r is compatible with its POSIX signature],
[gnupg_cv_func_ttyname_r_posix],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stddef.h>
#include <unistd.h>]],
[[*ttyname_r (0, NULL, 0);]])
],
[gnupg_cv_func_ttyname_r_posix=no],
[gnupg_cv_func_ttyname_r_posix=yes])
])
if test $gnupg_cv_func_ttyname_r_posix = no; then
AC_LIBOBJ([ttyname_r])
AC_DEFINE([REPLACE_TTYNAME_R],[1])
elif test "$have_android_system" = yes; then
# Android has ttyname and ttyname_r but they are only stubs and
# print an annoying warning message. Thus we need to replace
# ttyname_r with our own dummy function.
AC_LIBOBJ([ttyname_r])
AC_DEFINE([REPLACE_TTYNAME_R],[1])
else
AC_DEFINE([HAVE_POSIXDECL_TTYNAME_R], [1],
[Define if the ttyname_r function has a POSIX compliant declaration.])
dnl On Solaris 10, both ttyname_r functions (the one with the non-POSIX
dnl declaration and the one with the POSIX declaration) refuse to do
dnl anything when the output buffer is less than 128 bytes large.
dnl On OSF/1 5.1, ttyname_r ignores the buffer size and assumes the
dnl buffer is large enough.
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CACHE_CHECK([whether ttyname_r works with small buffers],
[gnupg_cv_func_ttyname_r_works],
[
dnl Initial guess, used when cross-compiling or when /dev/tty cannot
dnl be opened.
changequote(,)dnl
case "$host_os" in
# Guess no on Solaris.
solaris*) gnupg_cv_func_ttyname_r_works="guessing no" ;;
# Guess no on OSF/1.
osf*) gnupg_cv_func_ttyname_r_works="guessing no" ;;
# Guess yes otherwise.
*) gnupg_cv_func_ttyname_r_works="guessing yes" ;;
esac
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <fcntl.h>
#include <unistd.h>
int
main (void)
{
int result = 0;
int fd;
char buf[31]; /* use any size < 128 here */
fd = open ("/dev/tty", O_RDONLY);
if (fd < 0)
result |= 16;
else if (ttyname_r (fd, buf, sizeof (buf)) != 0)
result |= 17;
else if (ttyname_r (fd, buf, 1) == 0)
result |= 18;
return result;
}]])],
[gnupg_cv_func_ttyname_r_works=yes],
[case $? in
17 | 18) gnupg_cv_func_ttyname_r_works=no ;;
esac],
[:])
])
case "$gnupg_cv_func_ttyname_r_works" in
*yes) ;;
*) AC_LIBOBJ([ttyname_r])
AC_DEFINE([REPLACE_TTYNAME_R],[1])
AC_DEFINE([HAVE_BROKEN_TTYNAME_R], [1],
[Define if ttyname_r is does not work with small buffers])
;;
esac
fi
fi
])
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