client.c

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#define SERVER_PORT 8090

int main() {
    int clientSocket;
    char message[1024], buffer[1040];

    struct sockaddr_in serverAddress;

    socklen_t addressSize;

    clientSocket = socket(PF_INET, SOCK_STREAM, 0);

    serverAddress.sin_family = AF_INET;
    serverAddress.sin_port = htons(SERVER_PORT);
    serverAddress.sin_addr.s_addr = inet_addr("127.0.0.1");

    memset(serverAddress.sin_zero, '\0', sizeof serverAddress.sin_zero);

    addressSize = sizeof(serverAddress);
    if (connect(clientSocket, (struct sockaddr *) &serverAddress, addressSize) != 0) {
        printf("Connect Error: %s\n", strerror(errno));
    }

    strcpy(message, "Hello socket server!");
    if (send(clientSocket, message, strlen(message), 0) < 0) {
        printf("Socket send failed\n");
    }

    if (recv(clientSocket, buffer, 2048, 0) < 0) {
        printf("Socket receive failed\n");
    }

    printf("Received from server: %s\n", buffer);
    close(clientSocket);
}