Add support for CURLOPT_UNIX_SOCKET_PATH

CHANGES.txt

@@ -2,6 +2,8 @@
 
 * Add support for proxy types CURLPROXY_HTTPS and CURLPROXY_HTTPS2.
   (Volker Diels-Grabsch)
+* Add support for CURLOPT_UNIX_SOCKET_PATH.
+  (Volker Diels-Grabsch)
 
 ## 0.10.0 - 14 May 2025
 

config/discover.ml

@@ -291,6 +291,7 @@ let curl_h_declarations = [
   "CURLOPT_TIMEOUT_MS";
   "CURLOPT_TIMEVALUE";
   "CURLOPT_TRANSFERTEXT";
+  "CURLOPT_UNIX_SOCKET_PATH";
   "CURLOPT_UNRESTRICTED_AUTH";
   "CURLOPT_UPLOAD";
   "CURLOPT_URL";

curl-helper.c

@@ -3459,6 +3459,10 @@ SETOPT_LONG( BUFFERSIZE)
   SETOPT_STRING( AWS_SIGV4)
 #endif
 
+#if HAVE_DECL_CURLOPT_UNIX_SOCKET_PATH
+  SETOPT_STRING( UNIX_SOCKET_PATH)
+#endif
+
 /* Windows headers define these symbols and there is no (sane) way to
  * prevent macro expansion */
 
@@ -3921,6 +3925,11 @@ HAVE(TCP_KEEPALIVE),
 HAVE(TCP_KEEPIDLE),
 HAVE(TCP_KEEPINTVL),
 HAVE(NOPROXY),
+#if HAVE_DECL_CURLOPT_UNIX_SOCKET_PATH
+  HAVE(UNIX_SOCKET_PATH),
+#else
+  HAVENOT(UNIX_SOCKET_PATH),
+#endif
 };
 
 value caml_curl_easy_setopt(value conn, value option)

curl.ml

@@ -518,6 +518,7 @@ type curlOption =
   | CURLOPT_TCP_KEEPIDLE of int
   | CURLOPT_TCP_KEEPINTVL of int
   | CURLOPT_NOPROXY of string
+  | CURLOPT_UNIX_SOCKET_PATH of string
 
 type initOption =
   | CURLINIT_GLOBALALL
@@ -1165,6 +1166,9 @@ let set_proxy_ssl_options conn opts =
 let set_noproxy conn s =
   setopt conn (CURLOPT_NOPROXY s)
 
+let set_unix_socket_path conn unix_socket_path =
+  setopt conn (CURLOPT_UNIX_SOCKET_PATH unix_socket_path)
+
 let get_effectiveurl conn =
   match (getinfo conn CURLINFO_EFFECTIVE_URL) with
   | CURLINFO_String s -> s
@@ -1527,6 +1531,7 @@ class handle =
     method set_tcpkeepidle seconds = set_tcpkeepidle conn seconds
     method set_tcpkeepintvl seconds = set_tcpkeepintvl conn seconds
     method set_noproxy s = set_noproxy conn s
+    method set_unix_socket_path unix_socket_path = set_unix_socket_path conn unix_socket_path
 
     method get_effectiveurl = get_effectiveurl conn
     method get_redirecturl = get_redirecturl conn

curl.mli

@@ -530,6 +530,7 @@ type curlOption =
   | CURLOPT_TCP_KEEPIDLE of int
   | CURLOPT_TCP_KEEPINTVL of int
   | CURLOPT_NOPROXY of string
+  | CURLOPT_UNIX_SOCKET_PATH of string (* @since libcurl 7.40.0 *)
 
 type initOption =
   | CURLINIT_GLOBALALL
@@ -911,6 +912,7 @@ val set_mimepost : t -> curlMIMEPart list -> unit
 val set_sshknownhosts : t -> string -> unit
 val set_sshkeyfunction : t -> (curlKHMatch -> string -> curlKHStat) -> unit
 val set_noproxy : t -> string -> unit
+val set_unix_socket_path : t -> string -> unit
 
 (** {2 Get transfer properties} *)
 
@@ -1129,6 +1131,7 @@ class handle :
     method set_tcpkeepidle : int -> unit
     method set_tcpkeepintvl : int -> unit
     method set_noproxy : string -> unit
+    method set_unix_socket_path : string -> unit
 
     method get_effectiveurl : string
     method get_redirecturl : string