===================================================================
RCS file: /home/cvs/OpenXM/src/kan96xx/plugin/Attic/mysig.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -p -r1.3 -r1.4
--- OpenXM/src/kan96xx/plugin/Attic/mysig.c	2016/03/30 21:34:03	1.3
+++ OpenXM/src/kan96xx/plugin/Attic/mysig.c	2016/03/31 03:22:55	1.4
@@ -1,4 +1,4 @@
-/* $OpenXM: OpenXM/src/kan96xx/plugin/mysig.c,v 1.2 2016/03/30 09:20:40 takayama Exp $ */
+/* $OpenXM: OpenXM/src/kan96xx/plugin/mysig.c,v 1.3 2016/03/30 21:34:03 takayama Exp $ */
 #include <stdio.h>
 #include <signal.h>
 #include <unistd.h>
@@ -6,6 +6,7 @@
 #include <string.h>
 #include "mysig.h"
 
+static void *Old_handler;
 /*
   sigset SIGINT, SIGCHLD, SIGUSR1
  */
@@ -34,14 +35,33 @@ int block_signal(int sigset[]) {
 int set_signal(int sig,void (*handler)(int m)) {
   struct sigaction act;
   struct sigaction oldact;
+  int val;
   act.sa_handler=handler;
   act.sa_flags=0;
   act.sa_flags |= SA_RESTART;
   sigemptyset(&act.sa_mask);
-  return(sigaction(sig,&act,&oldact));
+  val=sigaction(sig,&act,&oldact);
+  Old_handler = oldact.sa_handler;
+  return(val);
 }
-int mysignal(int sig,void (*handler)(int m)) {
-  return(set_signal(sig,handler));
+/* 
+  my own emulation of signal for portability.
+ */
+void *mysignal(int sig,void (*handler)(int m)) {
+  int sigset[2];
+  if (handler == SIG_IGN) {
+    /*    sigset[0] = sig; sigset[1]=0;
+    block_signal(sigset);
+    return(SIG_IGN);*/
+    return(signal(sig,handler));
+  }else if (handler == SIG_DFL) {
+    return(signal(sig,handler));
+  }
+  /* on unix system, you may simply call signal(3) here.  */
+  set_signal(sig,handler);
+  /* unblock is necessary on cygwin, ... */
+  sigset[0] = sig; sigset[1]=0; unblock_signal(sigset);
+  return((void *)Old_handler);
 }