iw7-mod/deps/curl/docs/libcurl/opts/CURLOPT_LOCALPORT.md
2024-08-13 05:15:34 -04:00

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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_LOCALPORT
Section: 3
Source: libcurl
See-also:
- CURLINFO_LOCAL_PORT (3)
- CURLOPT_INTERFACE (3)
- CURLOPT_LOCALPORTRANGE (3)
---
# NAME
CURLOPT_LOCALPORT - local port number to use for socket
# SYNOPSIS
~~~c
#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
All
# EXAMPLE
~~~c
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 7.15.2
# RETURN VALUE
Returns CURLE_OK