From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 19 Aug 2025 20:46:55 +0000 (+0900)
Subject: fd-util: use heap only when nwea() does not work
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F38878%2Fhead;p=thirdparty%2Fsystemd.git

fd-util: use heap only when nwea() does not work

Then, we can avoid malloc in most cases.
---

diff --git a/src/basic/fd-util.c b/src/basic/fd-util.c
index 281cdfcc038..f1af57a3d0a 100644
--- a/src/basic/fd-util.c
+++ b/src/basic/fd-util.c
@@ -410,7 +410,7 @@ int close_all_fds(const int except[], size_t n_except) {
         assert(n_except < SIZE_MAX);
         n_sorted = n_except + 1;
 
-        if (n_sorted > 64) /* Use heap for large numbers of fds, stack otherwise */
+        if (n_sorted > ALLOCA_MAX / sizeof(int)) /* Use heap for large numbers of fds, stack otherwise */
                 sorted = sorted_malloc = new(int, n_sorted);
         else
                 sorted = newa(int, n_sorted);