Base code merged to SPIN 2.4

[platform/upstream/curl.git] / docs / examples / multi-post.c

diff --git a/docs/examples/multi-post.c b/docs/examples/multi-post.c
index c26338b..f511d66 100644 (file)
--- a/docs/examples/multi-post.c
+++ b/docs/examples/multi-post.c
@@ -80,9 +80,10 @@ int main(void)
 
     curl_multi_perform(multi_handle, &still_running);
 
-    while(still_running) {
+    do {
       struct timeval timeout;
       int rc; /* select() return code */
+      CURLMcode mc; /* curl_multi_fdset() return code */
 
       fd_set fdread;
       fd_set fdwrite;
@@ -109,15 +110,35 @@ 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) 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:
@@ -131,7 +152,7 @@ int main(void)
         printf("running: %d!\n", still_running);
         break;
       }
-    }
+    } while(still_running);
 
     curl_multi_cleanup(multi_handle);