1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_LOCALPORT 5Section: 3 6Source: libcurl 7See-also: 8 - CURLINFO_LOCAL_PORT (3) 9 - CURLOPT_INTERFACE (3) 10 - CURLOPT_LOCALPORTRANGE (3) 11Protocol: 12 - All 13Added-in: 7.15.2 14--- 15 16# NAME 17 18CURLOPT_LOCALPORT - local port number to use for socket 19 20# SYNOPSIS 21 22~~~c 23#include <curl/curl.h> 24 25CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORT, long port); 26~~~ 27 28# DESCRIPTION 29 30Pass a long. This sets the local port number of the socket used for the 31connection. This can be used in combination with CURLOPT_INTERFACE(3) 32and you are recommended to use CURLOPT_LOCALPORTRANGE(3) as well when 33this option is set. Valid port numbers are 1 - 65535. 34 35# DEFAULT 36 370, disabled - use whatever the system thinks is fine 38 39# %PROTOCOLS% 40 41# EXAMPLE 42 43~~~c 44int main(void) 45{ 46 CURL *curl = curl_easy_init(); 47 if(curl) { 48 CURLcode res; 49 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin"); 50 curl_easy_setopt(curl, CURLOPT_LOCALPORT, 49152L); 51 /* and try 20 more ports following that */ 52 curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 20L); 53 res = curl_easy_perform(curl); 54 curl_easy_cleanup(curl); 55 } 56} 57~~~ 58 59# %AVAILABILITY% 60 61# RETURN VALUE 62 63Returns CURLE_OK 64
