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+---
+c: Copyright (C) Daniel Stenberg, <daniel.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.