From: Yeonggi Kim <yg.kim@navercorp.com>
Date: Thu, 15 Oct 2026 23:45:58 +0000 (+0900)
Subject: BUG/MINOR: quic: handle EINTR on emission of packets without connection
X-Git-Tag: v3.5-dev10~178
X-Git-Url: https://git.kaiwu.me/?a=commitdiff_plain;h=205a071d9d9148cc9b893a454370f129bd9115fc;p=haproxy.git

BUG/MINOR: quic: handle EINTR on emission of packets without connection

Retry, Version Negotiation and Stateless Reset packets are emitted
without connection via quic_lstnr_sock_send(). If sendmsg() is
interrupted by a signal, the error is reported to the caller and the
packet is lost, while qc_snd_buf() retries the emission on EINTR.

Also retry the emission on EINTR in quic_lstnr_sock_send(). The impact
is limited, as the listener socket is non-blocking so sendmsg() is not
expected to be interrupted in practice, and a new packet will be
emitted in response to the next ones from the peer.

This may be backported along with the previous patches up to 2.8.
---

diff --git a/src/quic_sock.c b/src/quic_sock.c
index b4ea07eed..2af4b8f3e 100644
--- a/src/quic_sock.c
+++ b/src/quic_sock.c
@@ -837,6 +837,7 @@ ssize_t quic_lstnr_sock_send(struct listener *l, const void *buf, size_t len,
                              struct sockaddr_storage *src,
                              struct sockaddr_storage *dst)
 {
+	ssize_t ret;
 	struct msghdr msg;
 	struct iovec vec;
 	struct cmsghdr *cmsg = NULL;
@@ -871,7 +872,11 @@ ssize_t quic_lstnr_sock_send(struct listener *l, const void *buf, size_t len,
 		cmsg_set_saddr(&msg, &cmsg, src);
 	}
 
-	return sendmsg(l->rx.fd, &msg, 0);
+	do {
+		ret = sendmsg(l->rx.fd, &msg, 0);
+	} while (ret < 0 && errno == EINTR);
+
+	return ret;
 }
 
 /* Receive datagram on <qc> FD-owned socket.