From 40b417a03734e72803aea4fff0f4a3945b598e3e Mon Sep 17 00:00:00 2001
From: Mike Gilbert <floppym@gentoo.org>
Date: Mon, 8 Dec 2025 23:46:17 -0500
Subject: [PATCH] ucm: use closefrom instead of close_range

closefrom is a library function with a fallback mechanism for when the
kernel does not support the close_range syscall.

Also check for the function properly instead of assuming it is available
with _GNU_SOURCE defined.

Fixes: https://github.com/alsa-project/alsa-lib/issues/485
Signed-off-by: Mike Gilbert <floppym@gentoo.org>
---
 configure.ac       | 1 +
 src/ucm/ucm_exec.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 8f4bd0de1..f4862f64c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,6 +52,7 @@ dnl Checks for library functions.
 AC_PROG_GCC_TRADITIONAL
 AC_CHECK_FUNCS([uselocale])
 AC_CHECK_FUNCS([eaccess])
+AC_CHECK_DECLS([closefrom])
 
 dnl Enable largefile support
 AC_SYS_LARGEFILE
diff --git a/src/ucm/ucm_exec.c b/src/ucm/ucm_exec.c
index b5a22023b..713039b49 100644
--- a/src/ucm/ucm_exec.c
+++ b/src/ucm/ucm_exec.c
@@ -259,8 +259,8 @@ int uc_mgr_exec(const char *prog)
 
 		close(f);
 
-#if defined(_GNU_SOURCE)
-		close_range(3, maxfd, 0);
+#if HAVE_DECL_CLOSEFROM
+		closefrom(3);
 #else
 		for (f = 3; f < maxfd; f++)
 			close(f);