The branch main has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=eba403923626f2ecfd724e131da992a7c3cb7240

commit eba403923626f2ecfd724e131da992a7c3cb7240
Author:     Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2025-05-24 11:27:29 +0000
Commit:     Konstantin Belousov <k...@freebsd.org>
CommitDate: 2025-05-24 13:17:09 +0000

    libc: set close-on-exec for temp socket used to detect IPv6 support
    
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D50509
---
 lib/libc/gen/sysconf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c
index be42dd238b56..6a838ddd58d8 100644
--- a/lib/libc/gen/sysconf.c
+++ b/lib/libc/gen/sysconf.c
@@ -567,7 +567,7 @@ yesno:
        case _SC_IPV6:
 #if _POSIX_IPV6 == 0
                sverrno = errno;
-               value = _socket(PF_INET6, SOCK_DGRAM, 0);
+               value = _socket(PF_INET6, SOCK_CLOEXEC | SOCK_DGRAM, 0);
                errno = sverrno;
                if (value >= 0) {
                        _close(value);

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