Hello All,
My application tries to call curl_multi_perform function in seqence
(multiple times) with different data set with POSTFILEDS option.
Data goes successfully only first time but fails on subsequent
multi_perform.

Here is overall flow of application:

do_perform(multi_handle)
{
    /*This function does typical curl_multi_peroform operation and check
for return status */
}

init_curl(CURLM **multi_handle, CURLM **out_handle)
{
    *out_handle = curl_easy_init();
    /* This function initialize all options required by application as */
    /*
        CURLOPT_URL,CURLOPT_HTTPPOST, CURLOPT_WRITEFUNCTION,
CURLOPT_WRITEDATA
        CURLOPT_HTTPHEADER, CURLOPT_HTTPAUTH,
    */
    *multi_handle = curl_multi_init();
    if(CURLE_OK != (curlrc = curl_multi_add_handle(*multi_handle,
*out_handle))) return curlrc;
}

main()
{
    CURL *out_handle = NULL;
    CURLM *multi_handle = NULL;
    char out_buf[100];

    init_curl(&multi_handle, &out_handle);
    /*Set outgoing buffer */
   strcpy(out_buffer, "initial data");
   curl_easy_setopt(out_handle, CURLOPT_POSTFIELDS, out_buf);

   do_perform(&multi_handle); ///--------- This works. Data is send to
server

   strcpy(out_buffer, "subsequent data");
  
   curl_easy_setopt(out_handle, CURLOPT_POSTFIELDS, out_buf);

   do_perform(&multi_handle); ///--------- Here, data is not send to
server

* /* If I call init_curl again before curl_east_setopt, Things works
fine */*

   /*All cleanup code is here */
}

Any idea whats missing here or something else need to be done ?

--
Nilesh