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- .\" generated by cd2nroff 0.1 from CURLOPT_LOCALPORT.md
- .TH CURLOPT_LOCALPORT 3 "2025-01-17" libcurl
- .SH NAME
- CURLOPT_LOCALPORT \- local port number to use for socket
- .SH SYNOPSIS
- .nf
- #include <curl/curl.h>
- CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORT, long port);
- .fi
- .SH DESCRIPTION
- Pass a long. This sets the local port number of the socket used for the
- connection. This can be used in combination with \fICURLOPT_INTERFACE(3)\fP
- and you are recommended to use \fICURLOPT_LOCALPORTRANGE(3)\fP as well when
- this option is set. Valid port numbers are 1 \- 65535.
- .SH DEFAULT
- 0, disabled \- use whatever the system thinks is fine
- .SH PROTOCOLS
- This functionality affects all supported protocols
- .SH EXAMPLE
- .nf
- int main(void)
- {
- CURL *curl = curl_easy_init();
- if(curl) {
- CURLcode res;
- 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);
- res = curl_easy_perform(curl);
- curl_easy_cleanup(curl);
- }
- }
- .fi
- .SH AVAILABILITY
- Added in curl 7.15.2
- .SH RETURN VALUE
- Returns CURLE_OK
- .SH SEE ALSO
- .BR CURLINFO_LOCAL_PORT (3),
- .BR CURLOPT_INTERFACE (3),
- .BR CURLOPT_LOCALPORTRANGE (3)
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