04_intro_to_sockets: update readme

04_intro_to_sockets/README.md

@@ -5,7 +5,7 @@
 This project implements a daytime TCP/UDP server and client. 
 The server listens for incoming connections and responds with the current date
 and time. The client sends a message to the choosing the output format of the
-date and time. The server responnds with 
+date and time. 
 
 ## Usage
 
@@ -13,7 +13,8 @@ date and time. The server responnds with
 $ make
 # start tcp server
 $ bin/daytimeTCPSrv <port>
-# run tcp client
+# run tcp client 
+# message 1 -> get localtime otherwise get gmtime
 $ bin/daytimeTCPCli <server-ip> <server-port> <message>
 
 # start udp server

04_intro_to_sockets/lib/sockets.c

@@ -13,7 +13,6 @@ static void error_handling(char *message, int sock) {
     perror(message);
     if (sock != -1)
         close(sock);
-    close(sock);
 }
 
 int tcp_create_socket() {
@@ -39,12 +38,14 @@ void connect_to_server(int sock, char *ip, int port) {
         error_handling("connect() error", sock);
 }
 
-char* communicate(int sock, char *message) {
+int tcp_write(int sock, char* message) {
     // Sending the ASCII string
     if (write(sock, message, strlen(message)) == -1)
         error_handling("write() error", sock);
+    return 0;
+}
 
-    // Receiving response
+char *tcp_read(int sock) {
     char* response = malloc(BUFFER_SIZE);
     if (!response) 
         error_handling("Failed to allocate memory for response", sock);

04_intro_to_sockets/lib/sockets.h

@@ -7,8 +7,9 @@ int tcp_create_socket();
 // Function to connect to a server
 void connect_to_server(int sock, char *ip, int port);
 
-// Function to communicate with the server
+int tcp_write(int sock, char* message);
-char* communicate(int sock, char *message);
+
+char *tcp_read(int sock);
 
 // Function to create a TCP server socket
 int tcp_listen(int port);

04_intro_to_sockets/src/daytimeTCPCli.c

@@ -11,7 +11,8 @@ int main(int argc, char *argv[]) {
 
     int sock = tcp_create_socket();
     connect_to_server(sock, argv[1], atoi(argv[2]));
-    char* received_data = communicate(sock, argv[3]);
+    tcp_write(sock, argv[3]);
+    char* received_data = tcp_read(sock);
     if (received_data) {
         printf("Received from server: %s\n", received_data);
         free(received_data);