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Client TCP en mode connecté :

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <arpa/inet.h>

int main() {

    int clientSocket;

    struct sockaddr_inserverAddr;

    char buffer[1024];

clientSocket = socket(AF_INET, SOCK_STREAM, 0);

    if (clientSocket == -1) {

perror("Erreurlors de la création du socket");

        exit(EXIT_FAILURE);

    }

serverAddr.sin_family = AF_INET;

serverAddr.sin_port = htons(8080); // Port du serveur

serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1"); // Adresse IP du serveur

    if (connect(clientSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == -1) {

perror("Erreurlors de la connexion au serveur");

        exit(EXIT_FAILURE);

    }

strcpy(buffer, "Hello, serveur !");

    send(clientSocket, buffer, strlen(buffer), 0);

recv(clientSocket, buffer, 1024, 0);

printf("Réponse du serveur : %s\n", buffer);

    // Fermeture du socket

    close(clientSocket);

    return 0;

}