Add TP1 Signals code

TP1/signals/signal_receiver.cpp

@@ -0,0 +1,33 @@
+#include <sys/signalfd.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <iostream>
+
+using namespace std;
+
+bool keep_running = true;
+
+void sig_handler(int signo) {
+  cout << "Received signal " << signo << endl;
+  if (signo == SIGABRT) {
+		keep_running = false;
+	}
+}
+
+int main(int argc, char* argv[]) {
+  int type;
+  cout << "Enter 1 for busy wait and anything else for blocking wait:" << endl;
+  cin >> type;
+  signal(SIGUSR1, sig_handler);
+  signal(SIGUSR2, sig_handler);
+  signal(SIGABRT, sig_handler);
+  cout << "My pid is: " << getpid() << endl;
+  if(type == 1) {
+    while (keep_running);
+  } else {
+    while(keep_running)
+      pause();
+  }
+  return 0;
+}

TP1/signals/signal_sender.cpp

@@ -0,0 +1,24 @@
+#include <sys/signalfd.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <iostream>
+#include <errno.h>
+
+using namespace std;
+
+int main(int argc, char* argv[]){
+  int pid, signal;
+  cout << "Enter pid and signal" << endl;
+  cin >> pid >> signal;
+  if(kill(pid,signal) == -1){
+    if(errno==ESRCH){
+      cout << "PID inexistente" << endl;
+    }
+    else {
+      cout << "Ocorreu um erro" << endl;
+    }
+    return 1;
+}
+  return 0;
+}