third-party libs

third-party/curl-7.21.4/docs/examples/multi-double.c

@@ -0,0 +1,109 @@
+/*****************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ *
+ * This is a very simple example using the multi interface.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+/* somewhat unix-specific */
+#include <sys/time.h>
+#include <unistd.h>
+
+/* curl stuff */
+#include <curl/curl.h>
+
+/*
+ * Simply download two HTTP files!
+ */
+int main(void)
+{
+  CURL *http_handle;
+  CURL *http_handle2;
+  CURLM *multi_handle;
+
+  int still_running; /* keep number of running handles */
+
+  http_handle = curl_easy_init();
+  http_handle2 = curl_easy_init();
+
+  /* set options */
+  curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.example.com/");
+
+  /* set options */
+  curl_easy_setopt(http_handle2, CURLOPT_URL, "http://localhost/");
+
+  /* init a multi stack */
+  multi_handle = curl_multi_init();
+
+  /* add the individual transfers */
+  curl_multi_add_handle(multi_handle, http_handle);
+  curl_multi_add_handle(multi_handle, http_handle2);
+
+  /* we start some action by calling perform right away */
+  curl_multi_perform(multi_handle, &still_running);
+
+  while(still_running) {
+    struct timeval timeout;
+    int rc; /* select() return code */
+
+    fd_set fdread;
+    fd_set fdwrite;
+    fd_set fdexcep;
+    int maxfd = -1;
+
+    long curl_timeo = -1;
+
+    FD_ZERO(&fdread);
+    FD_ZERO(&fdwrite);
+    FD_ZERO(&fdexcep);
+
+    /* set a suitable timeout to play around with */
+    timeout.tv_sec = 1;
+    timeout.tv_usec = 0;
+
+    curl_multi_timeout(multi_handle, &curl_timeo);
+    if(curl_timeo >= 0) {
+      timeout.tv_sec = curl_timeo / 1000;
+      if(timeout.tv_sec > 1)
+        timeout.tv_sec = 1;
+      else
+        timeout.tv_usec = (curl_timeo % 1000) * 1000;
+    }
+
+    /* get file descriptors from the transfers */
+    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. */
+
+    rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+
+    switch(rc) {
+    case -1:
+      /* select error */
+      break;
+    case 0:
+    default:
+      /* timeout or readable/writable sockets */
+      curl_multi_perform(multi_handle, &still_running);
+      break;
+    }
+  }
+
+  curl_multi_cleanup(multi_handle);
+
+  curl_easy_cleanup(http_handle);
+  curl_easy_cleanup(http_handle2);
+
+  return 0;
+}