improved testing and connection handling

test/dumb/tcpclient4.cpp

@@ -0,0 +1,63 @@
+// TCP Client test program
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <stdlib.h>
+ 
+int atoi(const char *str);
+int close(int filedes);
+
+#define MSG_SZ 128
+
+int main(int argc , char *argv[])
+{
+    if(argc < 3) {
+        printf("usage: client <addr> <port> <single|multiple> <n?>\n");
+        return 1;
+    }
+   
+    int sock, port = atoi(argv[2]);
+    struct sockaddr_in server;
+    char message[MSG_SZ] , server_reply[MSG_SZ];
+     
+    sock = socket(AF_INET , SOCK_STREAM , 0);
+    if (sock == -1) {
+        printf("could not create socket");
+    }     
+    server.sin_addr.s_addr = inet_addr(argv[1]);
+    server.sin_family = AF_INET;
+    server.sin_port = htons( port );
+ 
+    printf("connecting...\n");
+    if (connect(sock , (struct sockaddr *)&server , sizeof(server)) < 0) {
+        perror("connect failed. Error");
+        return 1;
+    }
+    printf("connected\n");
+
+    char *msg = (char*)"welcome to the machine!";
+    
+    while(1)
+    {
+        // TX         
+        if(send(sock, msg, strlen(msg), 0) < 0) {
+            printf("send failed");
+            return 1;
+        }
+        else {
+            printf("TX: %s\n", msg);
+            printf("len = %ld\n", strlen(msg));
+
+            int bytes_read = read(sock, server_reply, MSG_SZ);
+            if(bytes_read < 0)
+                printf("\tRX: Nothing\n");
+            else
+                printf("\tRX = (%d bytes): %s\n", bytes_read, server_reply);
+        }
+    }
+    close(sock);
+    return 0;
+}