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-rw-r--r--docs/examples/multi-double.c31
1 files changed, 24 insertions, 7 deletions
diff --git a/docs/examples/multi-double.c b/docs/examples/multi-double.c
index 91422e6e2..df0922a1c 100644
--- a/docs/examples/multi-double.c
+++ b/docs/examples/multi-double.c
@@ -62,6 +62,7 @@ int main(void)
do {
struct timeval timeout;
int rc; /* select() return code */
+ CURLMcode mc; /* curl_multi_fdset() return code */
fd_set fdread;
fd_set fdwrite;
@@ -88,15 +89,31 @@ int main(void)
}
/* 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) we call
+ select(0, ...), which is basically equal to sleeping the timeout. On
+ Windows we can't sleep via select without a dummy socket and instead
+ we Sleep() for 100ms which is the minimum suggested value in the
+ curl_multi_fdset() doc. */
+
+#ifdef _WIN32
+ if(maxfd == -1) {
+ Sleep(100);
+ rc = 0;
+ }
+ else
+#endif
+ {
+ rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+ }
switch(rc) {
case -1: