Annotation of embedaddon/curl/docs/examples/multi-post.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
! 9: *
! 10: * This software is licensed as described in the file COPYING, which
! 11: * you should have received as part of this distribution. The terms
! 12: * are also available at https://curl.haxx.se/docs/copyright.html.
! 13: *
! 14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
! 15: * copies of the Software, and permit persons to whom the Software is
! 16: * furnished to do so, under the terms of the COPYING file.
! 17: *
! 18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
! 19: * KIND, either express or implied.
! 20: *
! 21: ***************************************************************************/
! 22: /* <DESC>
! 23: * using the multi interface to do a multipart formpost without blocking
! 24: * </DESC>
! 25: */
! 26:
! 27: #include <stdio.h>
! 28: #include <string.h>
! 29: #include <sys/time.h>
! 30:
! 31: #include <curl/curl.h>
! 32:
! 33: int main(void)
! 34: {
! 35: CURL *curl;
! 36:
! 37: CURLM *multi_handle;
! 38: int still_running = 0;
! 39:
! 40: curl_mime *form = NULL;
! 41: curl_mimepart *field = NULL;
! 42: struct curl_slist *headerlist = NULL;
! 43: static const char buf[] = "Expect:";
! 44:
! 45: curl = curl_easy_init();
! 46: multi_handle = curl_multi_init();
! 47:
! 48: if(curl && multi_handle) {
! 49: /* Create the form */
! 50: form = curl_mime_init(curl);
! 51:
! 52: /* Fill in the file upload field */
! 53: field = curl_mime_addpart(form);
! 54: curl_mime_name(field, "sendfile");
! 55: curl_mime_filedata(field, "multi-post.c");
! 56:
! 57: /* Fill in the filename field */
! 58: field = curl_mime_addpart(form);
! 59: curl_mime_name(field, "filename");
! 60: curl_mime_data(field, "multi-post.c", CURL_ZERO_TERMINATED);
! 61:
! 62: /* Fill in the submit field too, even if this is rarely needed */
! 63: field = curl_mime_addpart(form);
! 64: curl_mime_name(field, "submit");
! 65: curl_mime_data(field, "send", CURL_ZERO_TERMINATED);
! 66:
! 67: /* initialize custom header list (stating that Expect: 100-continue is not
! 68: wanted */
! 69: headerlist = curl_slist_append(headerlist, buf);
! 70:
! 71: /* what URL that receives this POST */
! 72: curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/upload.cgi");
! 73: curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
! 74:
! 75: curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
! 76: curl_easy_setopt(curl, CURLOPT_MIMEPOST, form);
! 77:
! 78: curl_multi_add_handle(multi_handle, curl);
! 79:
! 80: curl_multi_perform(multi_handle, &still_running);
! 81:
! 82: while(still_running) {
! 83: struct timeval timeout;
! 84: int rc; /* select() return code */
! 85: CURLMcode mc; /* curl_multi_fdset() return code */
! 86:
! 87: fd_set fdread;
! 88: fd_set fdwrite;
! 89: fd_set fdexcep;
! 90: int maxfd = -1;
! 91:
! 92: long curl_timeo = -1;
! 93:
! 94: FD_ZERO(&fdread);
! 95: FD_ZERO(&fdwrite);
! 96: FD_ZERO(&fdexcep);
! 97:
! 98: /* set a suitable timeout to play around with */
! 99: timeout.tv_sec = 1;
! 100: timeout.tv_usec = 0;
! 101:
! 102: curl_multi_timeout(multi_handle, &curl_timeo);
! 103: if(curl_timeo >= 0) {
! 104: timeout.tv_sec = curl_timeo / 1000;
! 105: if(timeout.tv_sec > 1)
! 106: timeout.tv_sec = 1;
! 107: else
! 108: timeout.tv_usec = (curl_timeo % 1000) * 1000;
! 109: }
! 110:
! 111: /* get file descriptors from the transfers */
! 112: mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
! 113:
! 114: if(mc != CURLM_OK) {
! 115: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
! 116: break;
! 117: }
! 118:
! 119: /* On success the value of maxfd is guaranteed to be >= -1. We call
! 120: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
! 121: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
! 122: to sleep 100ms, which is the minimum suggested value in the
! 123: curl_multi_fdset() doc. */
! 124:
! 125: if(maxfd == -1) {
! 126: #ifdef _WIN32
! 127: Sleep(100);
! 128: rc = 0;
! 129: #else
! 130: /* Portable sleep for platforms other than Windows. */
! 131: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
! 132: rc = select(0, NULL, NULL, NULL, &wait);
! 133: #endif
! 134: }
! 135: else {
! 136: /* Note that on some platforms 'timeout' may be modified by select().
! 137: If you need access to the original value save a copy beforehand. */
! 138: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
! 139: }
! 140:
! 141: switch(rc) {
! 142: case -1:
! 143: /* select error */
! 144: break;
! 145: case 0:
! 146: default:
! 147: /* timeout or readable/writable sockets */
! 148: printf("perform!\n");
! 149: curl_multi_perform(multi_handle, &still_running);
! 150: printf("running: %d!\n", still_running);
! 151: break;
! 152: }
! 153: }
! 154:
! 155: curl_multi_cleanup(multi_handle);
! 156:
! 157: /* always cleanup */
! 158: curl_easy_cleanup(curl);
! 159:
! 160: /* then cleanup the form */
! 161: curl_mime_free(form);
! 162:
! 163: /* free slist */
! 164: curl_slist_free_all(headerlist);
! 165: }
! 166: return 0;
! 167: }
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