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| .TH CURLOPT_LOCALPORTRANGE 3 "September 16, 2020" "libcurl 7.73.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_LOCALPORTRANGE \- number of additional local ports to try |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORTRANGE, |
| long range); |
| .SH DESCRIPTION |
| Pass a long. The \fIrange\fP argument is the number of attempts libcurl will |
| make to find a working local port number. It starts with the given |
| \fICURLOPT_LOCALPORT(3)\fP 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 exact 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. |
| .SH DEFAULT |
| 1 |
| .SH PROTOCOLS |
| All |
| .SH EXAMPLE |
| .nf |
| 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); |
| } |
| .fi |
| .SH AVAILABILITY |
| Added in 7.15.2 |
| .SH RETURN VALUE |
| Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. |
| .SH "SEE ALSO" |
| .BR CURLOPT_LOCALPORT "(3), " CURLOPT_INTERFACE "(3), " |
