git: 97f34921d77b - releng/14.3 - route: fix `route -n monitor` when its output is redirected

[Gordon Tetlow]

The branch releng/14.3 has been updated by gordon:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=97f34921d77b62721da53dbde19851cd38efe5c5

commit 97f34921d77b62721da53dbde19851cd38efe5c5
Author:     Oleg Streejak <o...@pcbtech.ru>
AuthorDate: 2025-07-17 17:06:50 +0000
Commit:     Gordon Tetlow <gor...@freebsd.org>
CommitDate: 2025-08-07 23:22:27 +0000

    route: fix `route -n monitor` when its output is redirected
    
    This is a small oversight in the transition to netlink; the non-netlink
    implementation would explicitly flush its stdout as necessary to avoid
    apparent long stalls in output when we end up fully-buffered.  Adjust
    the netlink implementation to do the same.  This was noticed while
    trying to triage failures in the wg-quick script.
    
    Commit message by kevans, patch by author.
    
    PR:             278265
    Fixes:          091fec1188929 ("route: switch transport protocol [...]")
    Approved by:    so
    Security:       FreeBSD-EN-25:14.route
    
    (cherry picked from commit 97b61b22edba74c62adba1d022fb73541aa5ff93)
    (cherry picked from commit dd695839efd80fe81143cd6c7a552c30df8448f6)
---
 sbin/route/route_netlink.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sbin/route/route_netlink.c b/sbin/route/route_netlink.c
index 28766b062e18..2870d256aadd 100644
--- a/sbin/route/route_netlink.c
+++ b/sbin/route/route_netlink.c
@@ -733,6 +733,7 @@ print_nlmsg(struct nl_helper *h, struct nlmsghdr *hdr, 
struct snl_msg_info *cinf
                print_nlmsg_generic(h, hdr, cinfo);
        }
 
+       fflush(stdout);
        snl_clear_lb(&h->ss_cmd);
 }