Initial message queue communication.

[wsti_so.git] / src / process3.c

diff --git a/src/process3.c b/src/process3.c
index b1b997212be53430306b69232a3c88bd7d2f3b14..54bb6587370a53648f0aecbc63a6e2b299ec5176 100644 (file)
--- a/src/process3.c
+++ b/src/process3.c
@@ -40,6 +40,18 @@ struct message {
 
 struct message * processes = NULL;
 
+/**
+ * Message queue variables
+ */
+key_t qkey;
+int qid_input;
+
+int qid_output1;
+int qid_output2;
+
+struct queue_message {
+       int signo;
+};
 
 /**
  * Handler for signals.
@@ -48,13 +60,23 @@ void sig_handler(int signo)
 {
        fprintf(stderr, "[%s] Received %s!\n", "process3", strsignal(signo));
        if (signo == SIGUSR1) {
+               fprintf(stderr, "[%s] > Notified!\n", "process3");
        }
        else if (signo == SIGTERM) {
                int i = 0;
+               struct queue_message msg;
+               msg.signo = signo;
+
                fprintf(stderr, "[%s] > Releasing resources\n", "process3");
                close(read_descriptor);
                for (; i < 3; i++) {
-                       fprintf(stderr, "[%s] Process %d, PID: %d\n", "process3", i, processes->pids[i]);
+                       pid_t pid = processes->pids[i];
+                       fprintf(stderr, "[%s] Process %d, PID: %d\n", "process3", i, pid);
+                       // Bleh
+                       if (i != 2) {
+                               msgsnd(pid, &msg, sizeof(msg));
+                               kill(pid, SIGUSR1);
+                       }
                }
                exit(0);
        }
@@ -107,6 +129,18 @@ int main(void) {
        processes = (struct message *)shmat(shmid, NULL, 0);
        processes->pids[2] = getpid();
 
+       fprintf(stderr, "[%s] Shared pid: %d\n", "process3", getpid());
+
+       sleep(1);
+       /**
+        * Register message queue to communicate with other processes
+        */
+       qkey = getpid();
+       qid_input = msgget(qkey, IPC_CREAT | 0666);
+       
+       qid_output1 = msgget(processes->pids[1], IPC_CREAT | 0666);
+       qid_output2 = msgget(processes->pids[2], IPC_CREAT | 0666);
+
        /* Reading from process2 */
        read_descriptor = open(read_pipe, O_RDONLY);