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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.3.115; envelope-from=vsementsov@virtuozzo.com; helo=EUR03-AM5-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/20 14:07:34 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, berrange@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com, kraxel@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @virtuozzo.com) Content-Type: text/plain; charset="utf-8" We are going to implement non-blocking connect in io/channel-socket. non-blocking connect includes three phases: 1. connect() call 2. wait until socket is ready 3. check result io/channel-socket has wait-on-socket API (qio_channel_yield(), qio_channel_wait()), so it's a good place for [2]. Still, the whole thing is not simple, because socket connect in case of inet socket includes several connect() calls, as SocketAddress may be parsed into a list of inet addresses. And after each non-blocking connect() upper layer should have a possibility to wait on the socket. We may try to implement a kind of abstract list or iterator for "sub" addresses of SocketAddress, but all this appears to be too complex and not worth doing (as actually, only inet sockets has such a "multiple" SocketAddress). So, let's instead make public API for inet sockets themselves, to be handled in separate in upper layer, if it needs non-blocking connect. Signed-off-by: Vladimir Sementsov-Ogievskiy --- include/qemu/sockets.h | 6 ++++++ util/qemu-sockets.c | 45 +++++++++++++++++++++++++++++++++++++----- 2 files changed, 46 insertions(+), 5 deletions(-) diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h index 7d1f813576..7389d6be55 100644 --- a/include/qemu/sockets.h +++ b/include/qemu/sockets.h @@ -34,6 +34,12 @@ int inet_ai_family_from_address(InetSocketAddress *addr, int inet_parse(InetSocketAddress *addr, const char *str, Error **errp); int inet_connect(const char *str, Error **errp); int inet_connect_saddr(InetSocketAddress *saddr, Error **errp); +int inet_connect_addr(InetSocketAddress *saddr, struct addrinfo *addr, + bool blocking, bool *in_progress, Error **errp); +struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr, + Error **errp); + +int socket_check(int fd, Error **errp); =20 NetworkAddressFamily inet_netfamily(int family); =20 diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index 8ccf4088c2..a02d00f342 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -354,11 +354,17 @@ listen_ok: ((rc) =3D=3D -EINPROGRESS) #endif =20 -static int inet_connect_addr(InetSocketAddress *saddr, - struct addrinfo *addr, Error **errp) +int inet_connect_addr(InetSocketAddress *saddr, struct addrinfo *addr, + bool blocking, bool *in_progress, Error **errp) { int sock, rc; =20 + assert(blocking =3D=3D !in_progress); + + if (in_progress) { + *in_progress =3D false; + } + sock =3D qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_prot= ocol); if (sock < 0) { error_setg_errno(errp, errno, "Failed to create socket"); @@ -366,6 +372,10 @@ static int inet_connect_addr(InetSocketAddress *saddr, } socket_set_fast_reuse(sock); =20 + if (!blocking) { + qemu_set_nonblock(sock); + } + /* connect to peer */ do { rc =3D 0; @@ -374,6 +384,13 @@ static int inet_connect_addr(InetSocketAddress *saddr, } } while (rc =3D=3D -EINTR); =20 + if (!blocking && rc =3D=3D -EINPROGRESS) { + if (in_progress) { + *in_progress =3D true; + } + return sock; + } + if (rc < 0) { error_setg_errno(errp, errno, "Failed to connect socket"); closesocket(sock); @@ -395,8 +412,26 @@ static int inet_connect_addr(InetSocketAddress *saddr, return sock; } =20 -static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr, - Error **errp) +int socket_check(int fd, Error **errp) +{ + int optval; + socklen_t optlen =3D sizeof(optval); + if (qemu_getsockopt(fd, SOL_SOCKET, SO_ERROR, &optval, &optlen) < 0) { + error_setg_errno(errp, errno, "Unable to check connection"); + return -1; + } + + if (optval !=3D 0) { + error_setg_errno(errp, errno, "Connection failed"); + return -1; + } + + return 0; +} + + +struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr, + Error **errp) { struct addrinfo ai, *res; int rc; @@ -466,7 +501,7 @@ int inet_connect_saddr(InetSocketAddress *saddr, Error = **errp) for (e =3D res; e !=3D NULL; e =3D e->ai_next) { error_free(local_err); local_err =3D NULL; - sock =3D inet_connect_addr(saddr, e, &local_err); + sock =3D inet_connect_addr(saddr, e, true, NULL, &local_err); if (sock >=3D 0) { break; } --=20 2.21.0