From 80bd319a6dfbc6d5f740dd53e0658cde97143a8f Mon Sep 17 00:00:00 2001
From: Bruno Raoult <braoult@gmail.com>
Date: Wed, 27 Jan 2021 16:00:05 +0100
Subject: [PATCH] Ooops.

---
 timer.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 66 insertions(+), 8 deletions(-)

diff --git a/timer.c b/timer.c
index 1945e4c..d7bf380 100644
--- a/timer.c
+++ b/timer.c
@@ -1,11 +1,68 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <time.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <string.h>
 #include "lceb.h"
 
+int sigint_received=0;
 int displaytimer=0;
 static  struct timespec start;
 
+static void stopall(signum)
+    int signum;
+{
+    printf("SIGNAL %d RECEIVED: aborting eval\n", signum);
+    sigint_received=1;
+}
+
+int stopped()
+{
+    return sigint_received;
+}
+
+void set_intr()
+{
+    struct sigaction sig;
+
+    sig.sa_handler = stopall;
+    sigemptyset(&sig.sa_mask);
+    sig.sa_flags = 0;
+    sigaction(SIGINT, &sig, NULL);
+    //sigaction(SIGUSR1, &sig, NULL);
+#   ifdef DEBUG
+    printf("SIGINT armed.\n");
+#   endif
+}
+
+void set_alarm(ms)
+    int ms;
+{
+    struct sigaction sig;
+    struct itimerval timer;
+
+    /* Install timer_handler as the signal handler for SIGVTALRM. */
+    //memset (&sa, 0, sizeof (sa));
+    sig.sa_handler = stopall;
+    sigemptyset(&sig.sa_mask);
+    sig.sa_flags = 0;
+    sigaction (SIGALRM, &sig, NULL);
+
+    timer.it_value.tv_sec = ms/1000;
+    timer.it_value.tv_usec = (ms%1000)*1000;
+#   ifdef DEBUG
+    printf("alarm clock set to %.2f secs.\n",
+           timer.it_value.tv_sec + timer.it_value.tv_usec / 1000000.);
+#   endif
+    /* ... and every 250 msec after that. */
+    timer.it_interval.tv_sec = 0;
+    timer.it_interval.tv_usec = 0;
+    /* Start a virtual timer. It counts down whenever this process is executing. */
+    setitimer (ITIMER_REAL, &timer, NULL);
+
+}
+
 void start_timer()
 {
     printf("timer started...\n");
@@ -29,7 +86,6 @@ double get_timer(timer)
     struct timespec timer;
 {
     double diff;
-
     diff=(timer.tv_sec - start.tv_sec) + (timer.tv_nsec - start.tv_nsec) / NANOSEC;
 #   ifdef DEBUG_TIMER
     printf("timer sec: %.5f\n", diff);
@@ -43,18 +99,20 @@ int main(ac, av)
     char **av;
 {
     int delay;
-    struct timespec end, tsdelay;
+    struct timespec end;
 
     if (ac != 2) {
         fprintf(stderr, "usage: %s msecs\n", *av);
         exit (1);
     }
-    delay=atoi(*(av+1));
+    delay=atoi(*(av+1))*10;
     start_timer();
-    tsdelay.tv_sec=delay/MILLISEC;
-    tsdelay.tv_nsec=delay%MILLISEC;
-    printf("delay %d=%ld:%ld\n", delay, tsdelay.tv_sec, tsdelay.tv_nsec);
-    nanosleep(&tsdelay, NULL);
+    set_intr();
+    set_alarm(delay);
+    //tsdelay.tv_sec=delay/MILLISEC;
+    //tsdelay.tv_nsec=delay%MILLISEC;
+    //printf("delay %d=%ld:%ld\n", delay, tsdelay.tv_sec, tsdelay.tv_nsec);
+    sleep(5);
     set_timer(&end);
     printf("Time elapsed: %.5f seconds\n", get_timer(end));