Graduate

Signed-off-by: Matt Strapp <matt@mattstrapp.net>

1 files changed, 108 insertions, 0 deletions

diff --git a/csci4061/102620_breakout/msg_queue_template.c b/csci4061/102620_breakout/msg_queue_template.c
new file mode 100644
index 0000000..af026f3
--- /dev/null
+++ b/csci4061/102620_breakout/msg_queue_template.c
@@ -0,0 +1,108 @@
+/*
+* Recitation Section Number: 02
+* Breakout Number: 05
+* Graden Hill (hill1582)
+* Gustav Baumgart (baumg260)
+* Matt Strapp (strap012)
+* Skylan Recnana (recan001)
+*/
+
+#include <stdio.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+#include <sys/wait.h>
+#include <zconf.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define PERM 0666
+#define MSGSIZE 100
+#define NCHILD 3
+
+// structure for message queue
+typedef struct msg_buffer {
+    long mtype;
+    char mtext[MSGSIZE];
+} message;
+
+int main(void) {
+    key_t key;
+    int msgid;
+    pid_t pid1, pid2;
+    message msg;
+
+    // generate unique key
+    key = ftok("recitation", 4061);
+
+    // creates a message queue
+    msgid = msgget(key, PERM | IPC_CREAT);
+
+
+    // sender child process
+    pid1 = fork();
+    if (pid1 == 0) {
+        for (int i = 0; i < NCHILD; i++) {
+            msg.mtype = 111;
+            memset(msg.mtext, '\0', MSGSIZE);
+            sprintf(msg.mtext, "Hello child %d", i);
+            // send message to other child processes
+            msgsnd(msgid, &msg, MSGSIZE, 0);
+
+
+            // display the message
+            printf("[%d] Data sent is : %s \n", i, msg.mtext);
+        }
+
+        for (int i = 0; i < NCHILD; i++) {
+            msg.mtype = 222;
+            memset(msg.mtext, '\0', MSGSIZE);
+            sprintf(msg.mtext, "Message %d", i);
+            // send message to other child processes
+            msgsnd(msgid, &msg, MSGSIZE, 0);
+
+            // display the message
+            printf("[%d] Data sent is : %s \n", i, msg.mtext);
+        }
+
+        for (int i = 0; i < NCHILD; i++) {
+            msg.mtype = 333;
+            memset(msg.mtext, '\0', MSGSIZE);
+            sprintf(msg.mtext, "Bye %d", i);
+            // send message to other child processes
+            msgsnd(msgid, &msg, MSGSIZE, 0);
+
+                // display the message
+                printf("[%d] Data sent is : %s \n", i, msg.mtext);
+        }
+
+        exit(0);
+    } else if (pid1 < 0) {
+        printf("fork1 error\n");
+        return -1;
+    }
+
+    // receiver child processes
+    for (int j = 0; j < NCHILD; j++) {
+        if ((pid2 = fork()) == 0) {
+            // receive message
+            msgrcv(msgid, &msg, MSGSIZE, 222, 0);
+
+
+            // display the message
+            printf("[%d] Data received is : %s \n", j, msg.mtext);
+
+            exit(0);
+        } else if (pid2 < 0) {
+            printf("fork2 error\n");
+            return -1;
+        }
+    }
+
+    while (wait(NULL) > 0);
+
+    // to destroy the message queue
+    msgctl(msgid, IPC_RMID, NULL);
+
+
+    return 0;
+}
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