72 lines
1.4 KiB
Markdown
72 lines
1.4 KiB
Markdown
|
---
|
||
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
SPDX-License-Identifier: curl
|
||
|
|
Title: CURLOPT_TCP_KEEPALIVE
|
||
|
|
Section: 3
|
||
|
|
Source: libcurl
|
||
|
|
See-also:
|
||
|
|
- CURLOPT_LOW_SPEED_LIMIT (3)
|
||
|
|
- CURLOPT_MAX_RECV_SPEED_LARGE (3)
|
||
|
|
- CURLOPT_TCP_KEEPIDLE (3)
|
||
|
|
- CURLOPT_TCP_KEEPINTVL (3)
|
||
|
|
---
|
||
|
|
|
||
|
|
# NAME
|
||
|
|
|
||
|
|
CURLOPT_TCP_KEEPALIVE - TCP keep-alive probing
|
||
|
|
|
||
|
|
# SYNOPSIS
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPALIVE, long probe);
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# DESCRIPTION
|
||
|
|
|
||
|
|
Pass a long. If set to 1, TCP keepalive probes are used. The delay and
|
||
|
|
frequency of these probes can be controlled by the
|
||
|
|
CURLOPT_TCP_KEEPIDLE(3) and CURLOPT_TCP_KEEPINTVL(3) options,
|
||
|
|
provided the operating system supports them. Set to 0 (default behavior) to
|
||
|
|
disable keepalive probes
|
||
|
|
|
||
|
|
# DEFAULT
|
||
|
|
|
||
|
|
0
|
||
|
|
|
||
|
|
# PROTOCOLS
|
||
|
|
|
||
|
|
All
|
||
|
|
|
||
|
|
# EXAMPLE
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
CURL *curl = curl_easy_init();
|
||
|
|
if(curl) {
|
||
|
|
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
|
||
|
|
|
||
|
|
/* enable TCP keep-alive for this transfer */
|
||
|
|
curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);
|
||
|
|
|
||
|
|
/* keep-alive idle time to 120 seconds */
|
||
|
|
curl_easy_setopt(curl, CURLOPT_TCP_KEEPIDLE, 120L);
|
||
|
|
|
||
|
|
/* interval time between keep-alive probes: 60 seconds */
|
||
|
|
curl_easy_setopt(curl, CURLOPT_TCP_KEEPINTVL, 60L);
|
||
|
|
|
||
|
|
curl_easy_perform(curl);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# AVAILABILITY
|
||
|
|
|
||
|
|
Added in 7.25.0
|
||
|
|
|
||
|
|
# RETURN VALUE
|
||
|
|
|
||
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|