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

#define PORT 9090
#define BUF_SIZE 1024

int main() {
    int sock = 0;
    struct sockaddr_in serv_addr;
    char *msg = "Hello from client with custom SO_SNDBUF";
    int sndbuf, len;

    // Create socket
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket creation error");
        return -1;
    }

    // Set send buffer size
    sndbuf = 16384;  // 16 KB
    if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf)) < 0) {
        perror("setsockopt SO_SNDBUF failed");
        exit(EXIT_FAILURE);
    }

    // Verify buffer size
    len = sizeof(sndbuf);
    getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, &len);
    printf("Client send buffer size = %d bytes\n", sndbuf);

    // Setup server address
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);

    if (inet_pton(AF_INET, "192.168.2.1", &serv_addr.sin_addr) <= 0) {
        perror("invalid address");
        return -1;
    }

    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("connection failed");
        return -1;
    }

    send(sock, msg, strlen(msg), 0);
    printf("Client sent message\n");

    close(sock);
    return 0;
}