Use docker as dev environment

regression/apps/network/tcp_client.c

@@ -0,0 +1,51 @@
+// From: https://www.geeksforgeeks.org/socket-programming-cc/.
+// Some minor modifications are made to the original code base.
+// Lisenced under CCBY-SA.
+
+// Client side C/C++ program to demonstrate socket programming
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#define PORT 8080
+  
+int main(int argc, char const* argv[])
+{
+    int status, valread, client_fd;
+    struct sockaddr_in serv_addr;
+    char* hello = "Hello from client";
+    char buffer[1024] = { 0 };
+    if ((client_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+        printf("\n Socket creation error \n");
+        return -1;
+    }
+  
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(PORT);
+  
+    // Convert IPv4 and IPv6 addresses from text to binary
+    // form
+    if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)
+        <= 0) {
+        printf(
+            "\nInvalid address/ Address not supported \n");
+        return -1;
+    }
+  
+    if ((status
+         = connect(client_fd, (struct sockaddr*)&serv_addr,
+                   sizeof(serv_addr)))
+        < 0) {
+        printf("\nConnection Failed \n");
+        return -1;
+    }
+    send(client_fd, hello, strlen(hello), 0);
+    printf("Hello message sent\n");
+    valread = read(client_fd, buffer, 1024);
+    printf("%s\n", buffer);
+  
+    // closing the connected socket
+    close(client_fd);
+    return 0;
+}