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CURLOPT_IOCTLDATA(3) Library Functions Manual CURLOPT_IOCTLDATA(3) NAME CURLOPT_IOCTLDATA - pointer passed to I/O callback SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer); DESCRIPTION Pass the pointer that is untouched by libcurl and passed as the 3rd argu- ment in the ioctl callback set with CURLOPT_IOCTLFUNCTION(3). DEFAULT NULL PROTOCOLS This functionality affects all supported protocols EXAMPLE #include <unistd.h> /* for lseek */ struct data { int fd; /* our file descriptor */ }; static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp) { struct data *io = (struct data *)clientp; if(cmd == CURLIOCMD_RESTARTREAD) { lseek(io->fd, 0, SEEK_SET); return CURLIOE_OK; } return CURLIOE_UNKNOWNCMD; } int main(void) { struct data ioctl_data; CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback); curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data); } } DEPRECATED Deprecated since 7.18.0. AVAILABILITY Added in curl 7.12.3 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). SEE ALSO CURLOPT_IOCTLFUNCTION(3), CURLOPT_SEEKFUNCTION(3) libcurl 2026-06-11 CURLOPT_IOCTLDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | DEPRECATED | AVAILABILITY | RETURN VALUE | SEE ALSO
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