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CURLOPT_STDERR(3) Library Functions Manual CURLOPT_STDERR(3) NAME CURLOPT_STDERR - redirect stderr to another stream SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STDERR, FILE *stream); DESCRIPTION Pass a FILE * as parameter. Tell libcurl to use this stream instead of stderr when showing the progress meter and displaying CURLOPT_VERBOSE(3) data. If you are using libcurl as a Windows DLL, this option causes an exception and a crash in the library since it cannot access a FILE * passed on from the application. A work-around is to instead use CURLOPT_DEBUGFUNCTION(3). DEFAULT stderr PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { CURL *curl; FILE *filep = fopen("dump", "wb"); if(!filep) return 1; curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); curl_easy_setopt(curl, CURLOPT_STDERR, filep); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } fclose(filep); } AVAILABILITY Added in curl 7.1 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_DEBUGFUNCTION(3), CURLOPT_NOPROGRESS(3), CURLOPT_VERBOSE(3) libcurl 2026-06-11 CURLOPT_STDERR(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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