개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

CURLOPT_SOCKOPTFUNCTION(3)

CURLOPT_SOCKOPTFUNCTION(3) curl_easy_setopt options CURLOPT_SOCKOPTFUNCTION(3)

NAME
       CURLOPT_SOCKOPTFUNCTION - callback for setting socket options

SYNOPSIS
       #include <curl/curl.h>

       typedef enum  {
         CURLSOCKTYPE_IPCXN,  /* socket created for a specific IP connection */
         CURLSOCKTYPE_ACCEPT, /* socket created by accept() call */
         CURLSOCKTYPE_LAST    /* never use */
       } curlsocktype;

       #define CURL_SOCKOPT_OK 0
       #define CURL_SOCKOPT_ERROR 1 /* causes libcurl to abort and return
                                       CURLE_ABORTED_BY_CALLBACK */
       #define CURL_SOCKOPT_ALREADY_CONNECTED 2

       int sockopt_callback(void *clientp,
                            curl_socket_t curlfd,
                            curlsocktype purpose);

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);

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

       When set, this callback function gets called by libcurl when the socket
       has  been created, but before the connect call to allow applications to
       change specific socket options. The callback's purpose argument identi‐
       fies the exact purpose for this particular socket:

       CURLSOCKTYPE_IPCXN for actively created  connections  or  since  7.28.0
       CURLSOCKTYPE_ACCEPT   for  FTP  when  the  connection  was  setup  with
       PORT/EPSV (in earlier versions these sockets were not  passed  to  this
       callback).

       Future  versions  of  libcurl may support more purposes. libcurl passes
       the newly created socket descriptor to the callback in the curlfd para‐
       meter so additional setsockopt() calls can be done at the  user's  dis‐
       cretion.

       The  clientp pointer contains whatever user-defined value set using the
       CURLOPT_SOCKOPTDATA(3) function.

       Return CURL_SOCKOPT_OK from the callback on success. Return  CURL_SOCK‐
       OPT_ERROR  from  the callback function to signal an unrecoverable error
       to  the  library  and   it   will   close   the   socket   and   return
       CURLE_COULDNT_CONNECT.  Alternatively, the callback function can return
       CURL_SOCKOPT_ALREADY_CONNECTED,  to tell libcurl that the socket is al‐
       ready connected and then libcurl will not attempt to connect  it.  This
       allows  an application to pass in an already connected socket with CUR‐
       LOPT_OPENSOCKETFUNCTION(3) and then have this function make libcurl not
       attempt to connect (again).

DEFAULT
       By default, this callback is NULL and unused.

PROTOCOLS
       All

EXAMPLE
       /* make libcurl use the already established socket 'sockfd' */

       static curl_socket_t opensocket(void *clientp,
                                       curlsocktype purpose,
                                       struct curl_sockaddr *address)
       {
         curl_socket_t sockfd;
         sockfd = *(curl_socket_t *)clientp;
         /* the actual externally set socket is passed in via the OPENSOCKETDATA
            option */
         return sockfd;
       }

       static int sockopt_callback(void *clientp, curl_socket_t curlfd,
                                   curlsocktype purpose)
       {
         /* This return code was added in libcurl 7.21.5 */
         return CURL_SOCKOPT_ALREADY_CONNECTED;
       }

       curl = curl_easy_init();
       if(curl) {
         /* libcurl will internally think that you connect to the host
          * and port that you specify in the URL option. */
         curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999");
         /* call this function to get a socket */
         curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
         curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);

         /* call this function to set options for the socket */
         curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);

         res = curl_easy_perform(curl);

         curl_easy_cleanup(curl);

AVAILABILITY
       Added in 7.16.0. The  CURL_SOCKOPT_ALREADY_CONNECTED  return  code  was
       added in 7.21.5.

RETURN VALUE
       Returns  CURLE_OK  if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLOPT_SOCKOPTDATA(3), CURLOPT_OPENSOCKETFUNCTION(3),

libcurl 7.86.0                   May 17, 2022       CURLOPT_SOCKOPTFUNCTION(3)