1 # ttyname_r.m4 serial 3
2 dnl Copyright (C) 2010 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_TTYNAME_R],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
11 dnl Persuade Solaris <unistd.h> to provide the POSIX compliant declaration of
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 AC_CHECK_FUNCS([ttyname_r])
16 if test $ac_cv_func_ttyname_r = no; then
19 dnl On MacOS X 10.4 (and Solaris 10 without gl_USE_SYSTEM_EXTENSIONS)
20 dnl the return type is 'char *', not 'int'.
21 AC_CACHE_CHECK([whether ttyname_r is compatible with its POSIX signature],
22 [gl_cv_func_ttyname_r_posix],
26 #include <unistd.h>]],
27 [[*ttyname_r (0, NULL, 0);]])
29 [gl_cv_func_ttyname_r_posix=no],
30 [gl_cv_func_ttyname_r_posix=yes])
32 if test $gl_cv_func_ttyname_r_posix = no; then
35 AC_DEFINE([HAVE_POSIXDECL_TTYNAME_R], [1],
36 [Define if the ttyname_r function has a POSIX compliant declaration.])
37 dnl On Solaris 10, both ttyname_r functions (the one with the non-POSIX
38 dnl declaration and the one with the POSIX declaration) refuse to do
39 dnl anything when the output buffer is less than 128 bytes large.
40 AC_REQUIRE([AC_CANONICAL_HOST])
41 AC_CACHE_CHECK([whether ttyname_r works with small buffers],
42 [gl_cv_func_ttyname_r_works],
44 dnl Initial guess, used when cross-compiling or when /dev/tty cannot
48 # Guess no on Solaris.
49 solaris*) gl_cv_func_ttyname_r_works="guessing no" ;;
50 # Guess yes otherwise.
51 *) gl_cv_func_ttyname_r_works="guessing yes" ;;
61 char buf[31]; /* use any size < 128 here */
63 fd = open ("/dev/tty", O_RDONLY);
66 if (ttyname_r (fd, buf, sizeof (buf)) != 0)
69 }], [gl_cv_func_ttyname_r_works=yes], [:], [:])
71 case "$gl_cv_func_ttyname_r_works" in
73 *) REPLACE_TTYNAME_R=1 ;;
77 if test $HAVE_TTYNAME_R = 0 || test $REPLACE_TTYNAME_R = 1; then
78 AC_LIBOBJ([ttyname_r])
83 # Prerequisites of lib/ttyname_r.c.
84 AC_DEFUN([gl_PREREQ_TTYNAME_R], [
85 AC_CHECK_FUNCS([ttyname])