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CURLOPT_LOCALPORT(3)	   Library Functions Manual	  CURLOPT_LOCALPORT(3)

NAME
       CURLOPT_LOCALPORT - local port number to	use for	socket

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORT, long port);

DESCRIPTION
       Pass a long. This sets the local	port number of the socket used for the
       connection.  This  can be used in combination with CURLOPT_INTERFACE(3)
       and you are recommended to use CURLOPT_LOCALPORTRANGE(3)	as  well  when
       this option is set. Valid port numbers are 1 - 65535.

DEFAULT
       0, disabled - use whatever the system thinks is fine

PROTOCOLS
       This functionality affects all supported	protocols

EXAMPLE
       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);
	 }
       }

AVAILABILITY
       Added in	curl 7.15.2

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLINFO_LOCAL_PORT(3), CURLOPT_INTERFACE(3), CURLOPT_LOCALPORTRANGE(3)

libcurl				  2025-06-03		  CURLOPT_LOCALPORT(3)

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