1 files changed, 65 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_USING_C/11.4.c b/reference/C/CONTRIB/OR_USING_C/11.4.c
new file mode 100644
index 0000000..346e577
--- /dev/null
+++ b/reference/C/CONTRIB/OR_USING_C/11.4.c
@@ -0,0 +1,65 @@
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+#include <stdio.h>
+
+#define MSGSZ     128
+
+#ifdef	NOT_USED
+/*
+ * Declare the message structure.
+ */
+struct msgbuf {
+    long    mtype;
+    char    mtext[MSGSZ];
+};
+#endif	/* NOT_USED */
+
+main()
+{
+    int msqid;
+    key_t key;
+    struct msgbuf sbuf, rbuf;
+
+    /*
+     * Get the message queue id for the
+     * "name" 1234, which was created by
+     * the server.
+     */
+    key = 1234;
+
+    if ((msqid = msgget(key, 0666)) < 0) {
+        perror("msgget");
+        exit(1);
+    }
+
+    /*
+     * We'll send message type 1, the server
+     * will send message type 2.
+     */
+    sbuf.mtype = 1;
+    sprintf(sbuf.mtext, "Did you get this?");
+
+    /*
+     * Send a message.
+     */
+    if (msgsnd(msqid, &sbuf, strlen(sbuf.mtext) + 1, 0) < 0) {
+        perror("msgsnd");
+        exit(1);
+    }
+
+    /*
+     * Receive an answer of message type 2.
+     */
+    if (msgrcv(msqid, &rbuf, MSGSZ, 2, 0) < 0) {
+        perror("msgrcv");
+        exit(1);
+    }
+
+    /*
+     * Print the answer.
+     */
+    printf("%s\n", rbuf.mtext);
+    exit(0);
+}
+