83 lines
1.4 KiB
Markdown
83 lines
1.4 KiB
Markdown
---
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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: CURLMOPT_SOCKETDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLMOPT_SOCKETFUNCTION (3)
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- CURLMOPT_TIMERFUNCTION (3)
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- curl_multi_socket_action (3)
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---
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# NAME
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CURLMOPT_SOCKETDATA - custom pointer passed to the socket callback
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETDATA, void *pointer);
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~~~
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# DESCRIPTION
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A data *pointer* to pass to the socket callback set with the
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CURLMOPT_SOCKETFUNCTION(3) option.
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This pointer is not touched by libcurl but is only passed in as the socket
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callback's **clientp** argument.
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# DEFAULT
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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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struct priv {
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void *ours;
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};
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static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
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{
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struct priv *p = sockp;
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printf("my ptr: %p\n", p->ours);
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if(what == CURL_POLL_REMOVE) {
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/* remove the socket from our collection */
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}
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if(what & CURL_POLL_IN) {
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/* wait for read on this socket */
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}
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if(what & CURL_POLL_OUT) {
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/* wait for write on this socket */
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}
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return 0;
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}
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int main(void)
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{
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struct priv setup;
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CURLM *multi = curl_multi_init();
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/* ... use socket callback and custom pointer */
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curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
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curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, &setup);
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}
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~~~
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# AVAILABILITY
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Added in 7.15.4
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# RETURN VALUE
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Returns CURLM_OK.
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