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23 .TH CURLOPT_SOCKOPTDATA 3 "May 15, 2017" "libcurl 7.59.0" "curl_easy_setopt options"
26 CURLOPT_SOCKOPTDATA \- custom pointer to pass to sockopt callback
28 #include <curl/curl.h>
30 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTDATA, void *pointer);
32 Pass a \fIpointer\fP that will be untouched by libcurl and passed as the first
33 argument in the sockopt callback set with \fICURLOPT_SOCKOPTFUNCTION(3)\fP.
35 The default value of this parameter is NULL.
40 static int sockopt_callback(void *clientp, curl_socket_t curlfd,
43 int val = *(int *)clientp;
44 setsockopt(curldfd, SOL_SOCKET, SO_RCVBUF, (const char *)&val, sizeof(val));
45 return CURL_SOCKOPT_OK;
48 curl = curl_easy_init();
50 int recvbuffersize = 256 * 1024;
52 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
54 /* call this function to set options for the socket */
55 curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
56 curl_easy_setopt(curl, CURLOPT_SOCKOPTDATA, &recvbuffersize);
58 res = curl_easy_perform(curl);
60 curl_easy_cleanup(curl);
66 Returns \fICURLE_OK\fP if the option is supported, and \fICURLE_UNKNOWN_OPTION\fP if not.
68 .BR CURLOPT_SOCKOPTFUNCTION "(3), " CURLOPT_OPENSOCKETFUNCTION "(3), "