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76 lines
3.2 KiB
76 lines
3.2 KiB
4 months ago
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.TH curl_easy_perform 3 "September 16, 2020" "libcurl 7.73.0" "libcurl Manual"
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.SH NAME
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curl_easy_perform - perform a blocking file transfer
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.SH SYNOPSIS
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.B #include <curl/curl.h>
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.sp
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.BI "CURLcode curl_easy_perform(CURL *" easy_handle ");"
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.ad
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.SH DESCRIPTION
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Invoke this function after \fIcurl_easy_init(3)\fP and all the
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\fIcurl_easy_setopt(3)\fP calls are made, and will perform the transfer as
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described in the options. It must be called with the same \fBeasy_handle\fP as
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input as the \fIcurl_easy_init(3)\fP call returned.
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\fIcurl_easy_perform(3)\fP performs the entire request in a blocking manner
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and returns when done, or if it failed. For non-blocking behavior, see
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\fIcurl_multi_perform(3)\fP.
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You can do any amount of calls to \fIcurl_easy_perform(3)\fP while using the
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same \fBeasy_handle\fP. If you intend to transfer more than one file, you are
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even encouraged to do so. libcurl will then attempt to re-use the same
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connection for the following transfers, thus making the operations faster,
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less CPU intense and using less network resources. Just note that you will
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have to use \fIcurl_easy_setopt(3)\fP between the invokes to set options for
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the following curl_easy_perform.
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You must never call this function simultaneously from two places using the
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same \fBeasy_handle\fP. Let the function return first before invoking it
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another time. If you want parallel transfers, you must use several curl
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easy_handles.
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While the \fBeasy_handle\fP is added to a multi handle, it cannot be used by
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\fIcurl_easy_perform(3)\fP.
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.SH RETURN VALUE
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CURLE_OK (0) means everything was ok, non-zero means an error occurred as
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.I <curl/curl.h>
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defines - see \fIlibcurl-errors(3)\fP. If the \fICURLOPT_ERRORBUFFER(3)\fP was
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set with \fIcurl_easy_setopt(3)\fP there will be a readable error message in
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the error buffer when non-zero is returned.
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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.fi
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.SH "SEE ALSO"
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.BR curl_easy_init "(3), " curl_easy_setopt "(3), "
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.BR curl_multi_add_handle "(3), " curl_multi_perform "(3), "
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.BR libcurl-errors "(3), "
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