87 lines
3.6 KiB
Groff
87 lines
3.6 KiB
Groff
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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) 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.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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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.TH curl_easy_perform 3 "August 22, 2023" "libcurl 8.3.0" "libcurl"
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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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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_perform(CURL *easy_handle);
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.fi
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.SH DESCRIPTION
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\fIcurl_easy_perform(3)\fP performs a network transfer in a blocking manner
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and returns when done, or earlier if it fails. For non-blocking behavior, see
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\fIcurl_multi_perform(3)\fP.
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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 it performs 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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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 attempts to reuse existing connections for
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the following transfers, thus making the operations faster, less CPU intense
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and using less network resources. You probably want to use
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\fIcurl_easy_setopt(3)\fP between the invokes to set options for the following
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curl_easy_perform call.
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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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A network transfer moves data to a peer or from a peer. An application tells
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libcurl how to receive data by setting the \fICURLOPT_WRITEFUNCTION(3)\fP and
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\fICURLOPT_WRITEDATA(3)\fP options. To tell libcurl what data to send, there
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are a few more alternatives but two common ones are
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\fICURLOPT_READFUNCTION(3)\fP and \fICURLOPT_POSTFIELDS(3)\fP.
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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 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 AVAILABILITY
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Always
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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 is a readable error message stored in
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the error buffer when non-zero is returned.
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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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