-# ttyname_r.m4 serial 2
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# ttyname_r.m4 serial 7
+dnl Copyright (C) 2010-2011 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_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ dnl Persuade Solaris <unistd.h> to provide the POSIX compliant declaration of
+ dnl ttyname_r().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ 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
else
- dnl On MacOS X 10.4 and Solaris 10 the return type is 'char *', not 'int'.
+ HAVE_TTYNAME_R=1
+ dnl On MacOS X 10.4 (and Solaris 10 without gl_USE_SYSTEM_EXTENSIONS)
+ dnl the return type is 'char *', not 'int'.
AC_CACHE_CHECK([whether ttyname_r is compatible with its POSIX signature],
[gl_cv_func_ttyname_r_posix],
[AC_COMPILE_IFELSE(
])
if test $gl_cv_func_ttyname_r_posix = no; then
REPLACE_TTYNAME_R=1
+ else
+ AC_DEFINE([HAVE_POSIXDECL_TTYNAME_R], [1],
+ [Define if the ttyname_r function has a POSIX compliant declaration.])
+ dnl On Solaris 10, both ttyname_r functions (the one with the non-POSIX
+ dnl declaration and the one with the POSIX declaration) refuse to do
+ dnl anything when the output buffer is less than 128 bytes large.
+ dnl On OSF/1 5.1, ttyname_r ignores the buffer size and assumes the
+ dnl buffer is large enough.
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_CACHE_CHECK([whether ttyname_r works with small buffers],
+ [gl_cv_func_ttyname_r_works],
+ [
+ dnl Initial guess, used when cross-compiling or when /dev/tty cannot
+ dnl be opened.
+changequote(,)dnl
+ case "$host_os" in
+ # Guess no on Solaris.
+ solaris*) gl_cv_func_ttyname_r_works="guessing no" ;;
+ # Guess no on OSF/1.
+ osf*) gl_cv_func_ttyname_r_works="guessing no" ;;
+ # Guess yes otherwise.
+ *) gl_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;
+}]])],
+ [gl_cv_func_ttyname_r_works=yes],
+ [case $? in
+ 17 | 18) gl_cv_func_ttyname_r_works=no ;;
+ esac],
+ [:])
+ ])
+ case "$gl_cv_func_ttyname_r_works" in
+ *yes) ;;
+ *) REPLACE_TTYNAME_R=1 ;;
+ esac
fi
fi
if test $HAVE_TTYNAME_R = 0 || test $REPLACE_TTYNAME_R = 1; then