mirror of
https://codeberg.org/kiss-community/repo
synced 2024-08-19 12:46:58 +00:00
68 lines
1.9 KiB
Groff
68 lines
1.9 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_RESOLVER_START_FUNCTION.md
|
|
.TH CURLOPT_RESOLVER_START_FUNCTION 3 "2024-06-01" libcurl
|
|
.SH NAME
|
|
CURLOPT_RESOLVER_START_FUNCTION \- callback called before a new name resolve is started
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
int resolver_start_cb(void *resolver_state, void *reserved, void *userdata);
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle,
|
|
CURLOPT_RESOLVER_START_FUNCTION,
|
|
resolver_start_cb);
|
|
.fi
|
|
.SH DESCRIPTION
|
|
Pass a pointer to your callback function, which should match the prototype
|
|
shown above.
|
|
|
|
This callback function gets called by libcurl every time before a new resolve
|
|
request is started.
|
|
|
|
\fIresolver_state\fP points to a backend\-specific resolver state. Currently only
|
|
the ares resolver backend has a resolver state. It can be used to set up any
|
|
desired option on the ares channel before it is used, for example setting up
|
|
socket callback options.
|
|
|
|
\fIreserved\fP is reserved.
|
|
|
|
\fIuserdata\fP is the user pointer set with the
|
|
\fICURLOPT_RESOLVER_START_DATA(3)\fP option.
|
|
|
|
The callback must return 0 on success. Returning a non\-zero value causes the
|
|
resolve to fail.
|
|
.SH DEFAULT
|
|
NULL (No callback)
|
|
.SH PROTOCOLS
|
|
All
|
|
.SH EXAMPLE
|
|
.nf
|
|
static int start_cb(void *resolver_state, void *reserved,
|
|
void *userdata)
|
|
{
|
|
(void)reserved;
|
|
printf("Received resolver_state=%p userdata=%p\\n",
|
|
resolver_state, userdata);
|
|
return 0;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
CURL *curl = curl_easy_init();
|
|
if(curl) {
|
|
curl_easy_setopt(curl, CURLOPT_RESOLVER_START_FUNCTION, start_cb);
|
|
curl_easy_setopt(curl, CURLOPT_RESOLVER_START_DATA, curl);
|
|
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
|
|
curl_easy_perform(curl);
|
|
curl_easy_cleanup(curl);
|
|
}
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Added in 7.59.0
|
|
.SH RETURN VALUE
|
|
Returns CURLE_OK
|
|
.SH SEE ALSO
|
|
.BR CURLOPT_PREREQFUNCTION (3),
|
|
.BR CURLOPT_RESOLVER_START_DATA (3)
|