X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fptsname_r.m4;h=bc5adb7d5c61872b79a51b3c7a577f4244ae2eff;hb=03ea4328ae1ea7e985f7fd9a42ebf77bc64bd47c;hp=695fe791b1ab543b9012ff6cb7d7ca5ded53aefd;hpb=f5562fca6f341accafc32a5285a0262625df0fde;p=gnulib.git

diff --git a/m4/ptsname_r.m4 b/m4/ptsname_r.m4
index 695fe791b..bc5adb7d5 100644
--- a/m4/ptsname_r.m4
+++ b/m4/ptsname_r.m4
@@ -1,5 +1,5 @@
-# ptsname_r.m4 serial 2
-dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
+# ptsname_r.m4 serial 3
+dnl Copyright (C) 2010-2012 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.
@@ -46,5 +46,38 @@ AC_DEFUN([gl_FUNC_PTSNAME_R],
 
 # 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 "$host_os" in
+          irix* | solaris* | mingw*)
+            gl_cv_func_isatty_sets_errno="guessing no";;
+          *)
+            gl_cv_func_isatty_sets_errno="guessing yes";;
+        esac
+       ])
+    ])
+  case "$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
 ])