X-Git-Url: https://git.dlugolecki.net.pl/?a=blobdiff_plain;f=src%2Fprocess3.c;h=b1b997212be53430306b69232a3c88bd7d2f3b14;hb=f0a7f7a71896b25cc524598e5472c821f987a71c;hp=b75f903af10e363d5c96d07000fa22609322f025;hpb=621bd5704dfeeccf51097ba255010bd37054972c;p=wsti_so.git

diff --git a/src/process3.c b/src/process3.c
index b75f903..b1b9972 100644
--- a/src/process3.c
+++ b/src/process3.c
@@ -9,12 +9,38 @@
 /* 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;
+
+
 /**
  * Handler for signals.
  */
@@ -24,13 +50,18 @@ void sig_handler(int signo)
 	if (signo == SIGUSR1) {
 	}
 	else if (signo == SIGTERM) {
+		int i = 0;
 		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]);
+		}
 		exit(0);
 	}
 	else if (signo == SIGTSTP) {
 		fprintf(stderr, "[%s] > Closing pipe\n", "process3");
 		close(read_descriptor);
+		raise (SIGSTOP);
 	}
 	else if (signo == SIGCONT) {
 		fprintf(stderr, "[%s] > Opening pipe\n", "process3");
@@ -67,6 +98,15 @@ int main(void) {
 		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();
+
 	/* Reading from process2 */
 	read_descriptor = open(read_pipe, O_RDONLY);