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-rw-r--r--csci4061/110920_breakout/chap8/pgm_8_1.c42
1 files changed, 42 insertions, 0 deletions
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