diff -prU2 Parser/intrcheck.c Parser/intrcheck.c
--- Parser/intrcheck.c
+++ Parser/intrcheck.c
@@ -98,9 +98,11 @@ PyOS_InterruptOccurred(void)
 /* Default version -- for real operating systems and for Standard C */
 
+#include <errno.h>
 #include <stdio.h>
 #include <string.h>
 #include <signal.h>
+#include <unistd.h>
 
-static int interrupted;
+static volatile sig_atomic_t interrupted;
 
 void
@@ -122,4 +124,5 @@ intcatcher(int sig)
 {
     extern void Py_Exit(int);
+    int save_errno = errno;
     static char message[] =
 "python: to interrupt a truly hanging Python program, interrupt once more.\n";
@@ -131,10 +134,13 @@ intcatcher(int sig)
         break;
     case 2:
-        interrupted = 0;
         Py_Exit(1);
         break;
+    case 3:
+        interrupted = 0;
+	_exit(1);	/* or POSIX _Exit(1) */
     }
     PyOS_setsig(SIGINT, intcatcher);
     Py_AddPendingCall(checksignals_witharg, NULL);
+    if (errno != save_errno) errno = save_errno;
 }