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CURLOPT_READDATA(3) Library Functions Manual CURLOPT_READDATA(3) NAME CURLOPT_READDATA - pointer passed to the read callback SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_READDATA, void *pointer); DESCRIPTION Data pointer to pass to the file read function. If you use the CUR- LOPT_READFUNCTION(3) option, this is the pointer you get as input in the fourth argument to the callback. If you do not specify a read callback but instead rely on the default in- ternal read function, this data must be a valid readable FILE * (cast to 'void *'). If you are using libcurl as a DLL on Windows, you must use the CUR- LOPT_READFUNCTION(3) callback if you set this option, otherwise you might experience crashes. DEFAULT stdin PROTOCOLS This functionality affects all supported protocols EXAMPLE struct MyData { void *custom; }; int main(void) { CURL *curl = curl_easy_init(); struct MyData this; if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* pass pointer that gets passed in to the CURLOPT_READFUNCTION callback */ curl_easy_setopt(curl, CURLOPT_READDATA, &this); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY This option was once known by the older name CURLOPT_INFILE, the name CUR- LOPT_READDATA(3) was introduced in 7.9.7. AVAILABILITY Added in curl 7.9.7 RETURN VALUE This returns CURLE_OK. SEE ALSO CURLOPT_HEADERDATA(3), CURLOPT_READFUNCTION(3), CURLOPT_WRITEDATA(3), CUR- LOPT_WRITEFUNCTION(3) libcurl 2026-06-11 CURLOPT_READDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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