diff -ruN kozos41/extintr.c kozos42/extintr.c
--- kozos41/extintr.c	Thu Feb 26 22:57:59 2009
+++ kozos42/extintr.c	Sun Mar  1 22:37:36 2009
@@ -9,6 +9,7 @@
 #include "extsub.h"
 
 #define USE_MESSAGE
+/* #define INTERRUPT_PRIORITY */
 
 #define BUFFER_SIZE 1024
 
@@ -16,8 +17,10 @@
 
 static int control_fd; /* 子プロセスへの制御用 */
 
-static int intrpri_current = 0;
+static int intrpri_current = EXTINTR_INTERRUPTS_NUM;
+#ifdef INTERRUPT_PRIORITY
 static int intrpri_old = 0;
+#endif
 
 static struct timerreg {
   int read_fd; /* 子プロセスからの転送用 */
@@ -152,6 +155,7 @@
   return 0;
 }
 
+#ifdef INTERRUPT_PRIORITY
 static struct interrupts *interrupts_search(int id)
 {
   int i;
@@ -162,7 +166,9 @@
   }
   return NULL;
 }
+#endif
 
+#ifdef INTERRUPT_PRIORITY
 static void preproc(int id)
 {
   struct interrupts *intp;
@@ -222,11 +228,14 @@
 
   return;
 }
+#endif
 
+#ifdef INTERRUPT_PRIORITY
 static void allmask(int id)
 {
   preproc(0);
 }
+#endif
 
 static int timer_mask(struct interrupts *intp)
 {
@@ -269,7 +278,9 @@
   switch (command[0]) {
   case EXTINTR_CMD_TIMER_USE:
     intp->id = id;
+#ifdef INTERRUPT_PRIORITY
     kz_precall(id, preproc);
+#endif
     break;
 
   case EXTINTR_CMD_TIMER_START:
@@ -359,7 +370,9 @@
   switch (command[0]) {
   case EXTINTR_CMD_CONSOLE_USE: /* コンソールの利用 */
     intp->id = id;
+#ifdef INTERRUPT_PRIORITY
     kz_precall(id, preproc);
+#endif
     break;
 
   case EXTINTR_CMD_CONSOLE_ENABLE:
@@ -412,7 +425,9 @@
       continue;
     if (intp->checkintr(intp)) {
       intp->intr(intp);
+#ifdef INTERRUPT_PRIORITY
       break;
+#endif
     }
   }
   return;
@@ -499,8 +514,10 @@
   extintr_intr_regist(&interrupts[6], &timerreg[3], timer_init);
   extintr_intr_regist(&interrupts[7], & consreg[3],  cons_init);
 
+#ifdef INTERRUPT_PRIORITY
   kz_precall(0, preproc);
   kz_precall(kz_getid(), allmask);
+#endif
 
   extintr_mainloop();