diff options
Diffstat (limited to 'docs/examples/multi-formadd.c')
| -rw-r--r-- | docs/examples/multi-formadd.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/docs/examples/multi-formadd.c b/docs/examples/multi-formadd.c new file mode 100644 index 000000000..bd85cc641 --- /dev/null +++ b/docs/examples/multi-formadd.c @@ -0,0 +1,171 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2017, 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> + * using the multi interface to do a multipart formpost without blocking + * </DESC> + */ + +#include <stdio.h> +#include <string.h> +#include <sys/time.h> + +#include <curl/curl.h> + +int main(void) +{ + CURL *curl; + + CURLM *multi_handle; + int still_running; + + struct curl_httppost *formpost = NULL; + struct curl_httppost *lastptr = NULL; + struct curl_slist *headerlist = NULL; + static const char buf[] = "Expect:"; + + /* Fill in the file upload field. This makes libcurl load data from + the given file name when curl_easy_perform() is called. */ + curl_formadd(&formpost, + &lastptr, + CURLFORM_COPYNAME, "sendfile", + CURLFORM_FILE, "postit2.c", + CURLFORM_END); + + /* Fill in the filename field */ + curl_formadd(&formpost, + &lastptr, + CURLFORM_COPYNAME, "filename", + CURLFORM_COPYCONTENTS, "postit2.c", + CURLFORM_END); + + /* Fill in the submit field too, even if this is rarely needed */ + curl_formadd(&formpost, + &lastptr, + CURLFORM_COPYNAME, "submit", + CURLFORM_COPYCONTENTS, "send", + CURLFORM_END); + + curl = curl_easy_init(); + multi_handle = curl_multi_init(); + + /* initialize custom header list (stating that Expect: 100-continue is not + wanted */ + headerlist = curl_slist_append(headerlist, buf); + if(curl && multi_handle) { + + /* what URL that receives this POST */ + curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/upload.cgi"); + curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); + + curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist); + curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost); + + curl_multi_add_handle(multi_handle, curl); + + curl_multi_perform(multi_handle, &still_running); + + do { + struct timeval timeout; + int rc; /* select() return code */ + CURLMcode mc; /* curl_multi_fdset() 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 */ + mc = curl_multi_fdset(multi_handle, &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); + } + + switch(rc) { + case -1: + /* select error */ + break; + case 0: + default: + /* timeout or readable/writable sockets */ + printf("perform!\n"); + curl_multi_perform(multi_handle, &still_running); + printf("running: %d!\n", still_running); + break; + } + } while(still_running); + + curl_multi_cleanup(multi_handle); + + /* always cleanup */ + curl_easy_cleanup(curl); + + /* then cleanup the formpost chain */ + curl_formfree(formpost); + + /* free slist */ + curl_slist_free_all(headerlist); + } + return 0; +} |