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- .TH CURLOPT_LOCALPORTRANGE 3 "January 02, 2023" "libcurl 7.88.1" "curl_easy_setopt options"
- .SH NAME
- CURLOPT_LOCALPORTRANGE \- number of additional local ports to try
- .SH SYNOPSIS
- .nf
- #include <curl/curl.h>
- CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORTRANGE,
- long range);
- .fi
- .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), "
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