timed duration http server

tdhttp.c

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <arpa/inet.h>
#include <stdio.h>

#define PORT 8192
#define TIMEOUT 10

int client;
void envoyerReponse();
void fermerConnexion();

int main()
{
        signal(SIGCHLD, SIG_IGN);

        // Informations sur le serveur

        struct sockaddr_in6 serverInfo;
        memset(&serverInfo, 0, sizeof serverInfo);

        serverInfo.sin6_family = AF_INET6;
        serverInfo.sin6_addr = in6addr_any;
        serverInfo.sin6_port = htons(PORT);

        // Creation du socket

        int server = socket(AF_INET6, SOCK_STREAM, 0);

        int yes = 1;
        setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes);

        bind(server, (struct sockaddr *) &serverInfo, sizeof serverInfo);
        listen(server, 20);

        for(;;)
        {
                struct sockaddr_in6 clientInfo;
                int clientInfoSize = sizeof clientInfo;
                client = accept(server, (struct sockaddr *) &clientInfo, &clientInfoSize);

                if (fork() == 0)
                {
                        envoyerReponse(client);
                }
        }

        return 0;
}

void envoyerReponse()
{
        // Arreter le programme apres TIMEOUT secondes

        signal(SIGALRM, fermerConnexion);
        alarm(TIMEOUT);

        // Envoyer les headers HTTP

        char headers[] =
                "HTTP/1.1 200 OK\r\n"
                "Content-Type: octet-stream\r\n"
                "Cache-Control: no-cache, no-transform\r\n"
                "\r\n";

        write(client, headers, strlen(headers));

        // Envoyer du contenu aleatoire en boucle

        #define BUFFSIZE (4096)
        char buffer[BUFFSIZE];
        memset(&buffer, 0, sizeof buffer);
        srand(time(NULL));

        // Get buffer size
        int sendbuff;
        socklen_t optlen = sizeof(sendbuff);
        int res = getsockopt(client, SOL_SOCKET, SO_SNDBUF, &sendbuff, &optlen);
        if(res == -1)
                printf("Error getsockopt one");
        else
                printf("send buffer size = %d\n", sendbuff);

        for(;;)
        {
        //      int i;
        //      for(i = 0; i < BUFFSIZE; i++)
        //      {
        //              buffer[i] = rand() & 255;
        //      }

                if(write(client, buffer, sizeof buffer) < 0)
                {
                        fermerConnexion();
                }
        }
}

void fermerConnexion()
{
        // Les 10 secondes sont passé

        shutdown(client, 2);
        //close(client);
        exit(0);
}