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CURLOPT_TIMECONDITION(3) Library Functions Manual CURLOPT_TIMECONDITION(3) NAME CURLOPT_TIMECONDITION - select condition for a time request SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMECONDITION, long cond); DESCRIPTION Pass a long as parameter. This defines how the CURLOPT_TIMEVALUE(3) time value is treated. You can set this parameter to CURL_TIMECOND_IFMODSINCE or CURL_TIMECOND_IFUNMODSINCE. The last modification time of a file is not always known and in such in- stances this feature has no effect even if the given time condition would not have been met. curl_easy_getinfo(3) with the CURLINFO_CONDITION_UNMET option can be used after a transfer to learn if a zero-byte successful "transfer" was due to this condition not matching. DEFAULT CURL_TIMECOND_NONE (0) PROTOCOLS This functionality affects file, ftp and http EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* January 1, 2020 is 1577833200 */ curl_easy_setopt(curl, CURLOPT_TIMEVALUE, 1577833200L); /* If-Modified-Since the above time stamp */ curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE); /* Perform the request */ result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY CURL_TIMECOND_* enums became long types in 8.13.0, prior to this version a long cast was necessary when passed to curl_easy_setopt(3). 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 CURLINFO_FILETIME(3), CURLOPT_TIMEVALUE(3) libcurl 2026-06-11 CURLOPT_TIMECONDITION(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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