libevent

#include
#include
#include
#include

#include
#include
#define MAX_CONN 10240

struct evhttp_request *requests[MAX_CONN];
struct evbuffer *bufs[MAX_CONN];
int pos[MAX_CONN], num;

void on_close(struct evhttp_request *req, void *arg) {
int* p = (int*) arg;
struct evhttp_request *p2 = requests[*p];
struct evbuffer *p3 = bufs[*p];
printf("%s closed.\n", p2->remote_host);
requests[*p] = NULL;
if (p3 != NULL) evbuffer_free(p3);
}

/* for comet recv */
void comet_handler(struct evhttp_request *req, void *arg) {
int i, j;
requests[num] = req;
struct evbuffer *buf;
 
req->minor = 0;
evhttp_add_header(req->output_headers, "Content-Type", "text/plain");

    evhttp_send_reply_start(req, HTTP_OK, "OK");

/* Set a callback for connection close. */
evhttp_connection_set_closecb(req->evcon, on_close, &pos[num]);

buf = evbuffer_new();
bufs[num] = buf;

for (j = 0; j < 10; j++)
  evbuffer_add_printf(buf, "Hi %s, this is a comet server based on libevent, visit for more information!\r\n", req->remote_host);
    evhttp_send_reply_chunk(req, buf);

    for (i = 0; i < num; i++) {
     if (requests[i] == NULL) continue;
     evbuffer_add_printf(bufs[i], "Oops, %s requests!\r\n", req->remote_host);
     evhttp_send_reply_chunk(requests[i], bufs[i]);
     // evhttp_send_reply_end(requests[i]);
    }
   
    if (num++ == MAX_CONN) err(1, "exceed max conn, TODO.");
}

/* for comet send, GET /id */
void notify_handler(struct evhttp_request *req, void *arg) {
    struct evbuffer *buf;
    int nudge;
   
    buf = evbuffer_new();
    if (buf == NULL) err(1, "failed to create response buffer");
    const char *uri = evhttp_request_uri(req);
    evbuffer_add_printf(buf, "Requested: %s, send a nudge to %s\n", uri, uri + 1);

nudge = atoi(uri + 1);
if (requests[nudge] != NULL) {
  evbuffer_add_printf(bufs[nudge], "Oops, received a nudge from %s!\r\n", req->remote_host);
  evhttp_send_reply_chunk(requests[nudge], bufs[nudge]);
}
   
    evhttp_send_reply(req, HTTP_OK, "OK", buf); // TODO: free buf
}

int main(int argc, char **argv) {
        struct evhttp *httpd;
        int i;
        for (i = 0; i < 1024; i++) {
         requests[i] == NULL;
         bufs[i] = NULL;
         pos[i] = i;
        }
        num = 0;

        event_init();
        httpd = evhttp_start("0.0.0.0", 8080);

        /* Set a comet callback for requests to "/". */
        evhttp_set_cb(httpd, "/", comet_handler, NULL);

        /* Set a send callback for all other requests. */
        evhttp_set_gencb(httpd, notify_handler, NULL);

        event_dispatch();

        /* Not reached in this code as it is now. */
        evhttp_free(httpd);
        return 0;
}