76 lines
1.5 KiB
Markdown
76 lines
1.5 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_SOCKOPTDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_OPENSOCKETFUNCTION (3)
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- CURLOPT_SOCKOPTFUNCTION (3)
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---
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# NAME
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CURLOPT_SOCKOPTDATA - pointer to pass to sockopt callback
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTDATA, void *pointer);
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~~~
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# DESCRIPTION
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Pass a *pointer* that is untouched by libcurl and passed as the first
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argument in the sockopt callback set with CURLOPT_SOCKOPTFUNCTION(3).
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# DEFAULT
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The default value of this parameter is NULL.
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# PROTOCOLS
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All
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# EXAMPLE
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~~~c
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static int sockopt_callback(void *clientp, curl_socket_t curlfd,
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curlsocktype purpose)
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{
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int val = *(int *)clientp;
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setsockopt((int)curlfd, SOL_SOCKET, SO_RCVBUF,
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(const char *)&val, sizeof(val));
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return CURL_SOCKOPT_OK;
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}
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int main(void)
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{
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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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int recvbuffersize = 256 * 1024;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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/* call this function to set options for the socket */
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curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
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curl_easy_setopt(curl, CURLOPT_SOCKOPTDATA, &recvbuffersize);
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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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}
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~~~
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# AVAILABILITY
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Added in 7.16.0
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# RETURN VALUE
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Returns *CURLE_OK* if the option is supported, and *CURLE_UNKNOWN_OPTION* if not.
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