CURLOPT_NEW_FILE_PERMS − permissions for remotely created files
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NEW_FILE_PERMS,
Pass a long as a parameter, containing the value of the permissions that will be assigned to newly created files on the remote server. The default value is 0644, but any valid value can be used. The only protocols that can use this are sftp://, scp://, and file://.
SFTP, SCP and FILE
Added in 7.16.4
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.