CURLOPT_LOCALPORTRANGE(3) curl_easy_setopt options CURLOPT_LOCALPORTRANGE(3)
NAME
CURLOPT_LOCALPORTRANGE - number of additional local ports to try
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORTRANGE,
long range);
DESCRIPTION
Pass a long. The range argument is the number of attempts libcurl will
make to find a working local port number. It starts with the given CUR-
LOPT_LOCALPORT(3) and adds one to the number for each retry. Setting
this option to 1 or below will make libcurl do only one try for the ex-
act port number. Port numbers by nature are scarce resources that will
be busy at times so setting this value to something too low might cause
unnecessary connection setup failures.
DEFAULT
1
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
curl_easy_setopt(curl, CURLOPT_LOCALPORT, 49152L);
/* and try 20 more ports following that */
curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 20L);
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
AVAILABILITY
Added in 7.15.2
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
if not.
SEE ALSO
CURLOPT_LOCALPORT(3), CURLOPT_INTERFACE(3),
libcurl 7.81.0 November 26, 2021 CURLOPT_LOCALPORTRANGE(3)
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