-0, what does it refer to?

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curlopt_tftp_no_options

CURLOPT_TFTP_NO_OPTIONS(3)				     curl_easy_setopt options					CURLOPT_TFTP_NO_OPTIONS(3)

NAME

       CURLOPT_TFTP_NO_OPTIONS - Do not send TFTP options requests.

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TFTP_NO_OPTIONS, long onoff);

DESCRIPTION

       Set onoff to 1L to exclude all TFTP options defined in RFC2347, RFC2348 and RFC2349 from read and write requests (RRQs/WRQs).

       This  option improves interop with some legacy servers that do not acknowledge or properly implement TFTP options. When this option is used
       CURLOPT_TFTP_BLKSIZE(3) is ignored.

DEFAULT

       0

PROTOCOLS

       TFTP

EXAMPLE

       size_t write_callback(char *ptr, size_t size, size_t nmemb, void *fp)
       {
	 return fwrite(ptr, size, nmemb, (FILE *)fp);
       }

       CURL *curl = curl_easy_init();
       if(curl) {
	 FILE *fp = fopen("foo.bin", "wb");
	 if(fp) {
	   curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)fp);
	   curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);

	   curl_easy_setopt(curl, CURLOPT_URL, "tftp://example.com/foo.bin");

	   /* do not send TFTP options requests */
	   curl_easy_setopt(curl, CURLOPT_TFTP_NO_OPTIONS, 1L);

	   /* Perform the request */
	   curl_easy_perform(curl);

	   fclose(fp);
	 }
	 curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.48.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

libcurl 7.54.0							  April 06, 2016					CURLOPT_TFTP_NO_OPTIONS(3)

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