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charset="utf-8" Commit aec21d3175 (qapi: Add InetSocketAddress member keep-alive) introduces the keep-alive flag, which enables the SO_KEEPALIVE socket option, but only on client-side sockets. However, this option is also useful for server-side sockets, so they can check if a client is still reachable or drop the connection otherwise. This patch enables the SO_KEEPALIVE socket option on passive server-side sockets if the keep-alive flag is enabled. This socket option is then inherited by active server-side sockets communicating with connected clients. This patch also fixes an issue in 'qio_dns_resolver_lookup_sync_inet()' where the keep-alive flag is not copied together with other attributes. Signed-off-by: Juraj Marcin --- io/dns-resolver.c | 2 ++ qapi/sockets.json | 4 ++-- util/qemu-sockets.c | 19 +++++++++++++------ 3 files changed, 17 insertions(+), 8 deletions(-) diff --git a/io/dns-resolver.c b/io/dns-resolver.c index 53b0e8407a..ee7403b65b 100644 --- a/io/dns-resolver.c +++ b/io/dns-resolver.c @@ -126,6 +126,8 @@ static int qio_dns_resolver_lookup_sync_inet(QIODNSReso= lver *resolver, .has_mptcp =3D iaddr->has_mptcp, .mptcp =3D iaddr->mptcp, #endif + .has_keep_alive =3D iaddr->has_keep_alive, + .keep_alive =3D iaddr->keep_alive, }; =20 (*addrs)[i] =3D newaddr; diff --git a/qapi/sockets.json b/qapi/sockets.json index 6a95023315..eb50f64e3a 100644 --- a/qapi/sockets.json +++ b/qapi/sockets.json @@ -56,8 +56,8 @@ # @ipv6: whether to accept IPv6 addresses, default try both IPv4 and # IPv6 # -# @keep-alive: enable keep-alive when connecting to this socket. Not -# supported for passive sockets. (Since 4.2) +# @keep-alive: enable keep-alive when connecting to/listening on this sock= et. +# (Since 4.2, not supported for listening sockets until 10.0) # # @mptcp: enable multi-path TCP. (Since 6.1) # diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index 77477c1cd5..c30e4ac2ce 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -220,12 +220,6 @@ static int inet_listen_saddr(InetSocketAddress *saddr, int saved_errno =3D 0; bool socket_created =3D false; =20 - if (saddr->keep_alive) { - error_setg(errp, "keep-alive option is not supported for passive " - "sockets"); - return -1; - } - memset(&ai,0, sizeof(ai)); ai.ai_flags =3D AI_PASSIVE; if (saddr->has_numeric && saddr->numeric) { @@ -344,6 +338,19 @@ listen_failed: return -1; =20 listen_ok: + if (saddr->keep_alive) { + int val =3D 1; + int ret =3D setsockopt(slisten, SOL_SOCKET, SO_KEEPALIVE, + &val, sizeof(val)); + + if (ret < 0) { + error_setg_errno(errp, errno, "Unable to set KEEPALIVE"); + close(slisten); + slisten =3D -1; + goto exit; + } + } +exit: freeaddrinfo(res); return slisten; } --=20 2.48.1