[PATCH v2 3/4] http.c: inline `set_curl_keepalive()`

From: Taylor Blau <me@ttaylorr.com>
Date: Mar 19, 2025, 22:23 UTC
Message-ID: <cdfc9baa8da95505aa4ad61bab07be0b063d916b.1742423021.git.me@ttaylorr.com>
In-Reply-To: <cover.1742423021.git.me@ttaylorr.com>

At the end of `get_curl_handle()` we call `set_curl_keepalive()` to enable TCP keepalive probes on our CURL handle. `set_curl_keepalive()` dates back to 47ce115370 (http: use curl's tcp keepalive if available, 2013-10-14), which conditionally compiled different variants of `set_curl_keepalive()` depending on what version of curl we were compiled with[^1].

As of f7c094060c (git-curl-compat: remove check for curl 7.25.0, 2024-10-23), we no longer conditionally compile `set_curl_keepalive()` since we no longer support pre-7.25.0 versions of curl. But the version of that function that we kept is really just a thin wrapper around setting the TCP_KEEPALIVE option, so there's no reason to keep it in its own function.

Inline the definition of `set_curl_keepalive()` to within `get_curl_handle()` so that the setup of our CURL handle is self-contained.

[1]: The details are spelled out in 47ce115370, but the gist is curl
  7.25.0 and newer use CURLOPT_TCP_KEEPALIVE, older versions use
  CURLOPT_SOCKOPTFUNCTION with a custom callback, and older versions
  that predate even that option do nothing.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 http.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/http.c b/http.c
index 17b676a1d5..b4267bfdb0 100644
--- a/http.c
+++ b/http.c
@@ -704,10 +704,6 @@ static int has_proxy_cert_password(void)
 	return 1;
 }
 
-static void set_curl_keepalive(CURL *c)
-{
-	curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
-}
 
 /* Return 1 if redactions have been made, 0 otherwise. */
 static int redact_sensitive_header(struct strbuf *header, size_t offset)
@@ -1242,7 +1238,7 @@ static CURL *get_curl_handle(void)
 	}
 	init_curl_proxy_auth(result);
 
-	set_curl_keepalive(result);
+	curl_easy_setopt(result, CURLOPT_TCP_KEEPALIVE, 1);
 
 	return result;
 }

-- 
2.49.0.4.ge59cf92f8d