From: Alan T. DeKok <aland@freeradius.org>
Date: Mon, 1 Sep 2025 22:55:58 +0000 (-0400)
Subject: add backlog parameter for the listen() API
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95e056f3863cbacbcae692c396312e9ce7e5345c;p=thirdparty%2Ffreeradius-server.git

add backlog parameter for the listen() API
---

diff --git a/src/lib/bio/fd.c b/src/lib/bio/fd.c
index 5dabcca8387..8f71ec0a036 100644
--- a/src/lib/bio/fd.c
+++ b/src/lib/bio/fd.c
@@ -919,10 +919,7 @@ int fr_bio_fd_init_listen(fr_bio_fd_t *my)
 	my->bio.read = fr_bio_null_read;
 	my->bio.write = fr_bio_null_write;
 
-	/*
-	 *	@todo - make the backlog configurable.
-	 */
-	if (listen(my->info.socket.fd, 8) < 0) {
+	if (listen(my->info.socket.fd, my->info.cfg->backlog_is_set ? my->info.cfg->backlog : 8) < 0) {
 		fr_strerror_printf("Failed calling listen() %s", fr_syserror(errno));
 		return fr_bio_error(IO);
 	}
diff --git a/src/lib/bio/fd.h b/src/lib/bio/fd.h
index 64d256f6bca..60e32201ce3 100644
--- a/src/lib/bio/fd.h
+++ b/src/lib/bio/fd.h
@@ -96,6 +96,8 @@ typedef struct {
 
 	char const	*interface;	//!< for binding to an interface
 
+	uint32_t	backlog;	//!< for listen()
+
 	uint32_t	recv_buff;	//!< How big the kernel's receive buffer should be.
 	uint32_t	send_buff;	//!< How big the kernel's send buffer should be.
 
@@ -117,6 +119,7 @@ typedef struct {
 	 */
 	bool		recv_buff_is_set;	//!< Whether we were provided with a recv_buf
 	bool		send_buff_is_set;	//!< Whether we were provided with a send_buf
+	bool		backlog_is_set;		//!< Whether we were provided with a backlog
 } fr_bio_fd_config_t;
 
 extern const conf_parser_t fr_bio_fd_client_config[];
diff --git a/src/lib/bio/fd_config.c b/src/lib/bio/fd_config.c
index 97b2dc10114..c259ac7f69e 100644
--- a/src/lib/bio/fd_config.c
+++ b/src/lib/bio/fd_config.c
@@ -319,6 +319,8 @@ static const conf_parser_t server_tcp_sub_config[] = {
 
 	{ FR_CONF_OFFSET("interface", fr_bio_fd_config_t, interface) },
 
+	{ FR_CONF_OFFSET_IS_SET("backlog", FR_TYPE_UINT32, 0, fr_bio_fd_config_t, backlog) },
+
 	{ FR_CONF_OFFSET_IS_SET("recv_buff", FR_TYPE_UINT32, 0, fr_bio_fd_config_t, recv_buff) },
 	{ FR_CONF_OFFSET_IS_SET("send_buff", FR_TYPE_UINT32, 0, fr_bio_fd_config_t, send_buff) },