Add project files.

3rd-party/curl-7.52.1/docs/examples/imap-multi.c

@@ -0,0 +1,173 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/* <DESC>
+ * IMAP example using the multi interface
+ * </DESC>
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <curl/curl.h>
+
+/* This is a simple example showing how to fetch mail using libcurl's IMAP
+ * capabilities. It builds on the imap-fetch.c example to demonstrate how to
+ * use libcurl's multi interface.
+ *
+ * Note that this example requires libcurl 7.30.0 or above.
+ */
+
+#define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
+
+static struct timeval tvnow(void)
+{
+  struct timeval now;
+
+  /* time() returns the value of time in seconds since the epoch */
+  now.tv_sec = (long)time(NULL);
+  now.tv_usec = 0;
+
+  return now;
+}
+
+static long tvdiff(struct timeval newer, struct timeval older)
+{
+  return (newer.tv_sec - older.tv_sec) * 1000 +
+    (newer.tv_usec - older.tv_usec) / 1000;
+}
+
+int main(void)
+{
+  CURL *curl;
+  CURLM *mcurl;
+  int still_running = 1;
+  struct timeval mp_start;
+
+  curl_global_init(CURL_GLOBAL_DEFAULT);
+
+  curl = curl_easy_init();
+  if(!curl)
+    return 1;
+
+  mcurl = curl_multi_init();
+  if(!mcurl)
+    return 2;
+
+  /* Set username and password */
+  curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
+  curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
+
+  /* This will fetch message 1 from the user's inbox */
+  curl_easy_setopt(curl, CURLOPT_URL, "imap://imap.example.com/INBOX/;UID=1");
+
+  /* Tell the multi stack about our easy handle */
+  curl_multi_add_handle(mcurl, curl);
+
+  /* Record the start time which we can use later */
+  mp_start = tvnow();
+
+  /* We start some action by calling perform right away */
+  curl_multi_perform(mcurl, &still_running);
+
+  while(still_running) {
+    struct timeval timeout;
+    fd_set fdread;
+    fd_set fdwrite;
+    fd_set fdexcep;
+    int maxfd = -1;
+    int rc;
+    CURLMcode mc; /* curl_multi_fdset() return code */
+
+    long curl_timeo = -1;
+
+    /* Initialise the file descriptors */
+    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(mcurl, &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 */
+    mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd);
+
+    if(mc != CURLM_OK) {
+      fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
+      break;
+    }
+
+    /* 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);
+    }
+
+    if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
+      fprintf(stderr,
+              "ABORTING: Since it seems that we would have run forever.\n");
+      break;
+    }
+
+    switch(rc) {
+    case -1:  /* select error */
+      break;
+    case 0:   /* timeout */
+    default:  /* action */
+      curl_multi_perform(mcurl, &still_running);
+      break;
+    }
+  }
+
+  /* Always cleanup */
+  curl_multi_remove_handle(mcurl, curl);
+  curl_multi_cleanup(mcurl);
+  curl_easy_cleanup(curl);
+  curl_global_cleanup();
+
+  return 0;
+}