fd_set fdexcep;
struct timeval timeout;
int rc;
+ CURLMcode mc; /* curl_multi_fdset() return code */
/* only attempt to fill buffer if transactions still running and buffer
* doesnt exceed required size already
}
/* get file descriptors from the transfers */
- curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
+ mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
- /* In a real-world program you OF COURSE check the return code of the
- function calls. On success, the value of maxfd is guaranteed to be
- greater or equal than -1. We call select(maxfd + 1, ...), specially
- in case of (maxfd == -1), we call select(0, ...), which is basically
- equal to sleep. */
+ if(mc != CURLM_OK)
+ {
+ fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
+ break;
+ }
- rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+ /* On success the value of maxfd is guaranteed to be >= -1. We call
+ select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
+ no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
+ to sleep 100ms, which is the minimum suggested value in the
+ curl_multi_fdset() doc. */
+
+ if(maxfd == -1) {
+#ifdef _WIN32
+ Sleep(100);
+ rc = 0;
+#else
+ /* Portable sleep for platforms other than Windows. */
+ struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
+ rc = select(0, NULL, NULL, NULL, &wait);
+#endif
+ }
+ else {
+ /* Note that on some platforms 'timeout' may be modified by select().
+ If you need access to the original value save a copy beforehand. */
+ rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+ }
switch(rc) {
case -1: