#include <signal.h>
#include <sys/shm.h>
+#include <sys/msg.h>
/** If buffer is too small to hold entire string, it is incremented by this value */
int qid_output2;
struct queue_message {
- int signo;
+ long mtype;
+ int signo[1];
};
+void notify_other_processes(int signo) {
+ int i = 0;
+ struct queue_message msg;
+ msg.signo[0] = signo;
+
+ for (; i < 3; i++) {
+ pid_t pid = processes->pids[i];
+ // Bleh
+ if (i != 0 && pid != 0) {
+ msg.mtype = i+1;
+ fprintf(stderr, "[%s] Sending message of type (%d) with value %d\n", "process1", msg.mtype, msg.signo[0]);
+ msgsnd(pid, &msg, sizeof(int), 0);
+ fprintf(stderr, "[%s] Sending signal %s (%d) to PID: %d\n", "process1", strsignal(SIGUSR1), SIGUSR1, pid);
+ kill(pid, SIGUSR1);
+ }
+ }
+}
+
/**
* Handler for signals.
*/
void sig_handler(int signo)
{
fprintf(stderr, "[%s] Received %s!\n", "process1", strsignal(signo));
+
if (signo == SIGUSR1) {
- fprintf(stderr, "[%s] > Notified!\n", "process3");
+ fprintf(stderr, "[%s] > Notified!\n", "process1");
+ struct queue_message msg;
+ /* Check queues from both other processes */
+ if (msgrcv(processes->pids[1], &msg, sizeof(int), 1, 0) > 0) {
+ fprintf(stderr, "[%s] > Notified with value: %s!\n", "process1", strsignal(msg.signo[0]));
+ raise(msg.signo[0]);
+ break;
+ }
+ else if (msgrcv(processes->pids[2], &msg, sizeof(int), 1, 0) > 0) {
+ fprintf(stderr, "[%s] > Notified with value: %s!\n", "process1", strsignal(msg.signo[0]));
+ raise(msg.signo[0]);
+ break;
+ }
}
else if (signo == SIGTERM) {
- int i = 0;
- struct queue_message msg;
- msg.signo = signo;
+ fprintf(stderr, "[%s] > Signalling other processes..\n", "process1");
+ processes->pids[1] = 0;
+ notify_other_processes(signo);
fprintf(stderr, "[%s] > Releasing resources\n", "process1");
close(write_pipe);
free(buffer);
buffer = NULL;
}
- for (; i < 3; i++) {
- pid_t pid = processes->pids[i];
- fprintf(stderr, "[%s] Process %d, PID: %d\n", "process3", i, pid);
- // Bleh
- if (i != 0) {
- msgsnd(pid, &msg, sizeof(msg));
- kill(pid, SIGUSR1);
- }
- }
exit(0);
}
else if (signo == SIGTSTP) {
fprintf(stderr, "[%s] Shared pid: %d\n", "process1", getpid());
- sleep(1);
/**
* Register message queue to communicate with other processes
*/