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_SEEKFUNCTION(3)

CURLOPT_SEEKFUNCTION(3)    curl_easy_setopt options    CURLOPT_SEEKFUNCTION(3)

NAME
       CURLOPT_SEEKFUNCTION - user callback for seeking in input stream

SYNOPSIS
       #include <curl/curl.h>

       /* These are the return codes for the seek callbacks */
       #define CURL_SEEKFUNC_OK       0
       #define CURL_SEEKFUNC_FAIL     1 /* fail the entire transfer */
       #define CURL_SEEKFUNC_CANTSEEK 2 /* tell libcurl seeking cannot be done, so
                                           libcurl might try other means instead */

       int seek_callback(void *userp, curl_off_t offset, int origin);

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SEEKFUNCTION, seek_callback);

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

       This  function  gets called by libcurl to seek to a certain position in
       the input stream and can be used to fast forward a file  in  a  resumed
       upload  (instead  of  reading  all  uploaded bytes with the normal read
       function/callback). It is also called to rewind a stream when data  has
       already  been  sent  to the server and needs to be sent again. This may
       happen when doing an HTTP PUT or POST with a multi-pass  authentication
       method,  or when an existing HTTP connection is reused too late and the
       server closes the connection. The function shall work like fseek(3)  or
       lseek(3)  and  it  gets  SEEK_SET, SEEK_CUR or SEEK_END as argument for
       origin, although libcurl currently only passes SEEK_SET.

       userp is the pointer you set with CURLOPT_SEEKDATA(3).

       The  callback  function  must  return  CURL_SEEKFUNC_OK   on   success,
       CURL_SEEKFUNC_FAIL  to cause the upload operation to fail or CURL_SEEK‐
       FUNC_CANTSEEK to indicate that while the seek failed, libcurl  is  free
       to  work  around  the  problem if possible. The latter can sometimes be
       done by instead reading from the input or similar.

       If you forward the input arguments directly to  fseek(3)  or  lseek(3),
       note  that  the  data  type  for  offset is not the same as defined for
       curl_off_t on many systems!

DEFAULT
       By default, this is NULL and unused.

PROTOCOLS
       HTTP, FTP, SFTP

EXAMPLE
       static int seek_cb(void *userp, curl_off_t offset, int origin)
       {
         struct data *d = (struct data *)userp;
         lseek(our_fd, offset, origin);
         return CURL_SEEKFUNC_OK;
       }

       {
         struct data seek_data;
         curl_easy_setopt(CURL *handle, CURLOPT_SEEKFUNCTION, seek_cb);
         curl_easy_setopt(CURL *handle, CURLOPT_SEEKDATA, &seek_data);
       }

AVAILABILITY
       Added in 7.18.0

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

SEE ALSO
       CURLOPT_SEEKDATA(3), CURLOPT_IOCTLFUNCTION(3),

libcurl 7.86.0                   May 17, 2022          CURLOPT_SEEKFUNCTION(3)