diff -r 14f042958c32 Modules/signalmodule.c
--- a/Modules/signalmodule.c	Tue Aug 30 02:12:43 2016 -0500
+++ b/Modules/signalmodule.c	Tue Aug 30 11:43:37 2016 +0200
@@ -962,7 +962,11 @@
 PyStructSequence_SET_ITEM(result, 4, _PyLong_FromUid(si->si_uid));
 PyStructSequence_SET_ITEM(result, 5,
 PyLong_FromLong((long)(si->si_status)));
+#ifdef HAVE_SIGINFO_T_SI_BAND
 PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(si->si_band));
+#else
+ PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(0L));
+#endif
 if (PyErr_Occurred()) {
 Py_DECREF(result);
 return NULL;
diff -r 14f042958c32 configure
--- a/configure	Tue Aug 30 02:12:43 2016 -0500
+++ b/configure	Tue Aug 30 11:43:37 2016 +0200
@@ -12907,6 +12907,18 @@
 
 fi
 
+# Issue #21085: In Cygwin, siginfo_t does not have si_band field.
+ac_fn_c_check_member "$LINENO" "siginfo_t" "si_band" "ac_cv_member_siginfo_t_si_band" "#include <signal.h>
+"
+if test "x$ac_cv_member_siginfo_t_si_band" = xyes; then :
+
+cat>>confdefs.h <<_aceof +#define HAVE_SIGINFO_T_SI_BAND 1 +_ACEOF + + +fi + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for time.h that defines altzone">&5
 $as_echo_n "checking for time.h that defines altzone... ">&6; }
diff -r 14f042958c32 configure.ac
--- a/configure.ac	Tue Aug 30 02:12:43 2016 -0500
+++ b/configure.ac	Tue Aug 30 11:43:37 2016 +0200
@@ -3790,6 +3790,8 @@
 #include <sys/types.h>
 #include <pwd.h>
 ]])
++# Issue #21085: In Cygwin, siginfo_t does not have si_band field.
++AC_CHECK_MEMBERS([siginfo_t.si_band], [], [], [[#include <signal.h>]])
 
 AC_MSG_CHECKING(for time.h that defines altzone)
 AC_CACHE_VAL(ac_cv_header_time_altzone,[
diff -r 14f042958c32 pyconfig.h.in
--- a/pyconfig.h.in	Tue Aug 30 02:12:43 2016 -0500
+++ b/pyconfig.h.in	Tue Aug 30 11:43:37 2016 +0200
@@ -868,6 +868,9 @@
 /* Define to 1 if you have the `sigaltstack' function. */
 #undef HAVE_SIGALTSTACK
 
+/* Define to 1 if `si_band' is a member of `siginfo_t'. */
+#undef HAVE_SIGINFO_T_SI_BAND
+
 /* Define to 1 if you have the `siginterrupt' function. */
 #undef HAVE_SIGINTERRUPT
 
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file44262/tip-issue21085-struct_siginfo-2.patch">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://bugs.python.org/file44262/tip-issue21085-struct_siginfo-2.patch" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>