3 files changed, 97 insertions, 0 deletions
diff --git a/csci4061/110920_breakout/chap8/Makefile b/csci4061/110920_breakout/chap8/Makefile
new file mode 100644
index 0000000..bd92bec
--- /dev/null
+++ b/csci4061/110920_breakout/chap8/Makefile
@@ -0,0 +1,12 @@
+pgm81: pgm_8_1.c
+	gcc pgm_8_1.c -lm -o  out
+	./out 5
+
+pgm85: pgm_8_5.c
+	gcc pgm_8_5.c -lm -o  out
+	./out
+
+.PHONY: clean
+
+clean:
+	rm out
diff --git a/csci4061/110920_breakout/chap8/pgm_8_1.c b/csci4061/110920_breakout/chap8/pgm_8_1.c
new file mode 100644
index 0000000..a979bb6
--- /dev/null
+++ b/csci4061/110920_breakout/chap8/pgm_8_1.c
@@ -0,0 +1,42 @@
+// Program 8.1
+
+#include <math.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+ 
+int main(int argc,  char *argv[]) {
+   int i;
+   sigset_t intmask;
+   int repeatfactor;
+   double y = 0.0;
+ 
+   if (argc != 2) {
+      fprintf(stderr, "Usage: %s repeatfactor\n", argv[0]);
+      return 1; 
+   }   
+   repeatfactor = atoi(argv[1]);
+   if ((sigemptyset(&intmask) == -1) || (sigaddset(&intmask, SIGINT) == -1)){
+      perror("Failed to initialize the signal mask");
+      return 1;
+   }
+   for ( ; ; ) {
+      if (sigprocmask(SIG_BLOCK, &intmask, NULL) == -1)
+         break; 
+      fprintf(stderr, "SIGINT signal blocked\n");
+      for (i = 0; i < repeatfactor; i++) 
+         y += sin((double)i);
+      fprintf(stderr, "Blocked calculation is finished, y = %f\n", y);
+      sleep(3);
+      if (sigprocmask(SIG_UNBLOCK, &intmask, NULL) == -1)
+         break;
+      fprintf(stderr, "SIGINT signal unblocked\n");
+      for (i = 0; i < repeatfactor; i++) 
+         y += sin((double)i);
+      fprintf(stderr, "Unblocked calculation is finished, y=%f\n", y);
+      sleep(3);
+   }    
+   perror("Failed to change signal mask");
+   return 1;
+}
+\ No newline at end of file
diff --git a/csci4061/110920_breakout/chap8/pgm_8_5.c b/csci4061/110920_breakout/chap8/pgm_8_5.c
new file mode 100644
index 0000000..b20cdfa
--- /dev/null
+++ b/csci4061/110920_breakout/chap8/pgm_8_5.c
@@ -0,0 +1,43 @@
+// Program 8.5
+
+#include <math.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static volatile sig_atomic_t doneflag = 0;
+
+/* ARGSUSED */
+static void setdoneflag(int signo) {
+   doneflag = 1;
+}
+
+int main (void) {
+   struct sigaction act;
+   int count = 0;
+   double sum = 0;
+   double x;
+
+   act.sa_handler = setdoneflag;            /* set up signal handler */
+   act.sa_flags = 0;
+   if ((sigemptyset(&act.sa_mask) == -1) ||
+       (sigaction(SIGINT, &act, NULL) == -1)) {
+      perror("Failed to set SIGINT handler");
+      return 1;
+   }
+    
+   while (!doneflag) {
+      x = (rand() + 0.5)/(RAND_MAX + 1.0);
+      sum += sin(x);
+      count++;
+      printf("Count is %d and average is %f\n", count, sum/count);
+      sleep(3);
+   }
+
+   printf("Program terminating ...\n");
+   if (count == 0)
+      printf("No values calculated yet\n");
+   else
+      printf("Count is %d and average is %f\n", count, sum/count);
+   return 0;
+}
+\ No newline at end of file