CURLOPT_TCP_KEEPIDLE - alive idle time wait
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPIDLE, long delay);
CURLOPT_TCP_KEEPIDLE(3)    curl_easy_setopt options    CURLOPT_TCP_KEEPIDLE(3)
NAME
       CURLOPT_TCP_KEEPIDLE - TCP keep-alive idle time wait
SYNOPSIS
       #include <curl/curl.h>
       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPIDLE, long delay);
DESCRIPTION
       Pass a long. Sets the delay, in seconds, that the operating system will
       wait while the connection is idle before sending keepalive probes.  Not
       all operating systems support this option.
DEFAULT
       60
PROTOCOLS
       All
EXAMPLE
       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);
         /* set 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.
ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:
       +---------------+------------------+
       |ATTRIBUTE TYPE | ATTRIBUTE VALUE  |
       +---------------+------------------+
       |Availability   | web/curl         |
       +---------------+------------------+
       |Stability      | Uncommitted      |
       +---------------+------------------+
SEE ALSO
       CURLOPT_TCP_KEEPALIVE(3), CURLOPT_TCP_KEEPINTVL(3),
NOTES
       Source code for open source software components in Oracle  Solaris  can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.
       This    software    was    built    from    source     available     at
       https://github.com/oracle/solaris-userland.    The  original  community
       source      was      downloaded       from        https://curl.se/down-
       load/curl-7.83.1.tar.bz2.
       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.
libcurl 7.83.1                 November 26, 2021       CURLOPT_TCP_KEEPIDLE(3)