Annotation of embedaddon/curl/docs/examples/multi-app.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2019, 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: * A basic application source code using the multi interface doing two
! 24: * transfers in parallel.
! 25: * </DESC>
! 26: */
! 27:
! 28: #include <stdio.h>
! 29: #include <string.h>
! 30:
! 31: /* somewhat unix-specific */
! 32: #include <sys/time.h>
! 33: #include <unistd.h>
! 34:
! 35: /* curl stuff */
! 36: #include <curl/curl.h>
! 37:
! 38: /*
! 39: * Download a HTTP file and upload an FTP file simultaneously.
! 40: */
! 41:
! 42: #define HANDLECOUNT 2 /* Number of simultaneous transfers */
! 43: #define HTTP_HANDLE 0 /* Index for the HTTP transfer */
! 44: #define FTP_HANDLE 1 /* Index for the FTP transfer */
! 45:
! 46: int main(void)
! 47: {
! 48: CURL *handles[HANDLECOUNT];
! 49: CURLM *multi_handle;
! 50:
! 51: int still_running = 0; /* keep number of running handles */
! 52: int i;
! 53:
! 54: CURLMsg *msg; /* for picking up messages with the transfer status */
! 55: int msgs_left; /* how many messages are left */
! 56:
! 57: /* Allocate one CURL handle per transfer */
! 58: for(i = 0; i<HANDLECOUNT; i++)
! 59: handles[i] = curl_easy_init();
! 60:
! 61: /* set the options (I left out a few, you'll get the point anyway) */
! 62: curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "https://example.com");
! 63:
! 64: curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://example.com");
! 65: curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L);
! 66:
! 67: /* init a multi stack */
! 68: multi_handle = curl_multi_init();
! 69:
! 70: /* add the individual transfers */
! 71: for(i = 0; i<HANDLECOUNT; i++)
! 72: curl_multi_add_handle(multi_handle, handles[i]);
! 73:
! 74: /* we start some action by calling perform right away */
! 75: curl_multi_perform(multi_handle, &still_running);
! 76:
! 77: while(still_running) {
! 78: struct timeval timeout;
! 79: int rc; /* select() return code */
! 80: CURLMcode mc; /* curl_multi_fdset() return code */
! 81:
! 82: fd_set fdread;
! 83: fd_set fdwrite;
! 84: fd_set fdexcep;
! 85: int maxfd = -1;
! 86:
! 87: long curl_timeo = -1;
! 88:
! 89: FD_ZERO(&fdread);
! 90: FD_ZERO(&fdwrite);
! 91: FD_ZERO(&fdexcep);
! 92:
! 93: /* set a suitable timeout to play around with */
! 94: timeout.tv_sec = 1;
! 95: timeout.tv_usec = 0;
! 96:
! 97: curl_multi_timeout(multi_handle, &curl_timeo);
! 98: if(curl_timeo >= 0) {
! 99: timeout.tv_sec = curl_timeo / 1000;
! 100: if(timeout.tv_sec > 1)
! 101: timeout.tv_sec = 1;
! 102: else
! 103: timeout.tv_usec = (curl_timeo % 1000) * 1000;
! 104: }
! 105:
! 106: /* get file descriptors from the transfers */
! 107: mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
! 108:
! 109: if(mc != CURLM_OK) {
! 110: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
! 111: break;
! 112: }
! 113:
! 114: /* On success the value of maxfd is guaranteed to be >= -1. We call
! 115: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
! 116: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
! 117: to sleep 100ms, which is the minimum suggested value in the
! 118: curl_multi_fdset() doc. */
! 119:
! 120: if(maxfd == -1) {
! 121: #ifdef _WIN32
! 122: Sleep(100);
! 123: rc = 0;
! 124: #else
! 125: /* Portable sleep for platforms other than Windows. */
! 126: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
! 127: rc = select(0, NULL, NULL, NULL, &wait);
! 128: #endif
! 129: }
! 130: else {
! 131: /* Note that on some platforms 'timeout' may be modified by select().
! 132: If you need access to the original value save a copy beforehand. */
! 133: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
! 134: }
! 135:
! 136: switch(rc) {
! 137: case -1:
! 138: /* select error */
! 139: break;
! 140: case 0: /* timeout */
! 141: default: /* action */
! 142: curl_multi_perform(multi_handle, &still_running);
! 143: break;
! 144: }
! 145: }
! 146:
! 147: /* See how the transfers went */
! 148: while((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
! 149: if(msg->msg == CURLMSG_DONE) {
! 150: int idx;
! 151:
! 152: /* Find out which handle this message is about */
! 153: for(idx = 0; idx<HANDLECOUNT; idx++) {
! 154: int found = (msg->easy_handle == handles[idx]);
! 155: if(found)
! 156: break;
! 157: }
! 158:
! 159: switch(idx) {
! 160: case HTTP_HANDLE:
! 161: printf("HTTP transfer completed with status %d\n", msg->data.result);
! 162: break;
! 163: case FTP_HANDLE:
! 164: printf("FTP transfer completed with status %d\n", msg->data.result);
! 165: break;
! 166: }
! 167: }
! 168: }
! 169:
! 170: curl_multi_cleanup(multi_handle);
! 171:
! 172: /* Free the CURL handles */
! 173: for(i = 0; i<HANDLECOUNT; i++)
! 174: curl_easy_cleanup(handles[i]);
! 175:
! 176: return 0;
! 177: }
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