X-Git-Url: https://git.dlugolecki.net.pl/?a=blobdiff_plain;f=src%2Fprocess3.c;h=54bb6587370a53648f0aecbc63a6e2b299ec5176;hb=b1c3c5ca4ac63d8e7f92cc130a75d2322b8a28d8;hp=e75a4fb610d66bae33e895d8271178a8280fe1e7;hpb=08dc9bf01302aa7d9a75efca24de1a9b19ec5c9e;p=wsti_so.git

diff --git a/src/process3.c b/src/process3.c
index e75a4fb..54bb658 100644
--- a/src/process3.c
+++ b/src/process3.c
@@ -9,34 +9,84 @@
 /* Signals handling.. */
 #include <signal.h>
 
+#include <sys/shm.h>
+
 /** Named pipe used to communicate with process2 */
 char * read_pipe = "/tmp/process2pipe";
 
 /** Descriptor of input pipe */
 int read_descriptor;
 
+
+/**
+ * Shared memory variables
+ */
+/**
+ * Memory key for processes. Must be same between all processes to properly
+ * communicate.
+ */
+key_t shmkey = 18912;
+/**
+ * Id of the shared memory
+ */
+int shmid;
+
+/**
+ * Message shared by processes. Contains array of process IDs
+ */
+struct message {
+	pid_t pids[3];
+};
+
+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.
  */
 void sig_handler(int signo)
 {
+	fprintf(stderr, "[%s] Received %s!\n", "process3", strsignal(signo));
 	if (signo == SIGUSR1) {
-		fprintf(stderr, "[%s] Received SIGUSR1!\n", "process3");
+		fprintf(stderr, "[%s] > Notified!\n", "process3");
 	}
-	else if (signo == SIGQUIT) {
-		fprintf(stderr, "[%s] Received SIGQUIT!\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++) {
+			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);
 	}
-	else if (signo == SIGINT) {
-		fprintf(stderr, "[%s] Received SIGINT!\n", "process3");
-		fprintf(stderr, "[%s] > Closing pipe\n", "process2");
+	else if (signo == SIGTSTP) {
+		fprintf(stderr, "[%s] > Closing pipe\n", "process3");
 		close(read_descriptor);
+		raise (SIGSTOP);
 	}
 	else if (signo == SIGCONT) {
-		fprintf(stderr, "[%s] Received SIGCONT!\n", "process3");
-		fprintf(stderr, "[%s] > Opening pipe\n", "process2");
+		fprintf(stderr, "[%s] > Opening pipe\n", "process3");
 		read_descriptor = open(read_pipe, O_RDONLY);
 	}
 }
@@ -60,16 +110,37 @@ int main(void) {
 	if (signal(SIGUSR1, sig_handler) == SIG_ERR) {
 		fprintf(stderr, "can't catch SIGUSR1\n");
 	}
-	if (signal(SIGQUIT, sig_handler) == SIG_ERR) {
-		fprintf(stderr, "can't catch SIGQUIT\n");
+	if (signal(SIGTERM, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGTERM\n");
 	}
-	if (signal(SIGINT, sig_handler) == SIG_ERR) {
-		fprintf(stderr, "can't catch SIGINT\n");
+	if (signal(SIGTSTP, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGTSTP\n");
 	}
 	if (signal(SIGCONT, sig_handler) == SIG_ERR) {
 		fprintf(stderr, "can't catch SIGCONT\n");
 	}
 
+	/*
+	 * Register memory to share with other processes, and pass current
+	 * process id to the array.
+	 */
+	shmid = shmget(shmkey, sizeof(struct message), IPC_CREAT | 0666);
+
+	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);