개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

CURLOPT_RESOLVER_START_FUNCTION(3)

curl_easy_setopt options                    CURLOPT_RESOLVER_START_FUNCTION(3)



NAME
       CURLOPT_RESOLVER_START_FUNCTION  -  callback  called  before a new name
       resolve is started

SYNOPSIS
       #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);

DESCRIPTION
       Pass a pointer to your callback function, which should match the proto‐
       type shown above.

       This  callback  function gets called by libcurl every time before a new
       resolve request is started.

       resolver_state 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's  used,  for
       example setting up socket callback options.

       reserved is reserved.

       userdata     is    the    user    pointer    set    with    the    CUR‐
       LOPT_RESOLVER_START_DATA(3) option.

       The callback must return 0 on success. Returning a non-zero value  will
       cause the resolve to fail.

DEFAULT
       NULL (No callback)

PROTOCOLS
       All

EXAMPLE
       static int resolver_start_cb(void *resolver_state, void *reserved,
                                    void *userdata)
       {
         (void)reserved;
         printf("Received resolver_state=%p userdata=%p\n",
                resolver_state, userdata);
         return 0;
       }

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_RESOLVER_START_FUNCTION, resolver_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);
       }

AVAILABILITY
       Added in 7.59.0

RETURN VALUE
       Returns CURLE_OK

SEE ALSO
       CURLOPT_RESOLVER_START_DATA(3)



libcurl 7.86.0                   May 17, 2022
                                            CURLOPT_RESOLVER_START_FUNCTION(3)