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CURLOPT_IOCTLDATA.3

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    23. 

  23. .TH CURLOPT_IOCTLDATA 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
    24. 

  24. .SH NAME
    25. 

  25. CURLOPT_IOCTLDATA \- pointer passed to I/O callback
    26. 

  26. .SH SYNOPSIS
    27. 

  27. .nf
    28. 

  28. #include <curl/curl.h>
    29. 

  29. 

  30. CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer);
    31. 

  31. .fi
    32. 

  32. .SH DESCRIPTION
    33. 

  33. Pass the \fIpointer\fP that will be untouched by libcurl and passed as the 3rd
    34. 

  34. argument in the ioctl callback set with \fICURLOPT_IOCTLFUNCTION(3)\fP.
    35. 

  35. .SH DEFAULT
    36. 

  36. By default, the value of this parameter is NULL.
    37. 

  37. .SH PROTOCOLS
    38. 

  38. Used with HTTP
    39. 

  39. .SH EXAMPLE
    40. 

  40. .nf
    41. 

  41. static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp)
    42. 

  42. {
    43. 

  43.   struct data *io = (struct data *)clientp;
    44. 

  44.   if(cmd == CURLIOCMD_RESTARTREAD) {
    45. 

  45.     lseek(fd, 0, SEEK_SET);
    46. 

  46.     current_offset = 0;
    47. 

  47.     return CURLIOE_OK;
    48. 

  48.   }
    49. 

  49.   return CURLIOE_UNKNOWNCMD;
    50. 

  50. }
    51. 

  51. {
    52. 

  52.   struct data ioctl_data;
    53. 

  53.   curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback);
    54. 

  54.   curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data);
    55. 

  55. }
    56. 

  56. .fi
    57. 

  57. .SH AVAILABILITY
    58. 

  58. Added in 7.12.3
    59. 

  59. .SH RETURN VALUE
    60. 

  60. Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
    61. 

  61. .SH "SEE ALSO"
    62. 

  62. .BR CURLOPT_IOCTLFUNCTION "(3), " CURLOPT_SEEKFUNCTION "(3), "
    63.