[Qemu-devel] [PATCH v4 0/4] nonblocking connect address handling cleanup

[Orit Wasserman]

Changes from v3:
        - add missing parenthesis QEMU_SOCKET_RC_INPROGRESS macro
        - remove "block" from dummy_opts
        - remove in_progress from external API (inet_connect_opts and 
          inet_nonblocking_connect)
        - Allocate ConnectState inside inet_connect_opts, this make the 
          structure internal to qemu-sockets.c
        - fix migrate_fd_cleanup to handle invalid fd.
        
Changes from v2:
        - remove the use of getnameinfo
        - remove errp for inet_connect_addr
        - remove QemuOpt "block"
        - fix errors in wait_for_connect 
        - pass ConnectState as a parameter to allow concurrent connect ops

getaddrinfo can give us a list of addresses, but we only try to
connect to the first one. If that fails we never proceed to
the next one.  This is common on desktop setups that often have ipv6
configured but not actually working.
A simple way to reproduce the problem is migration:
for the destination use -incoming tcp:0:4444, run migrate -d tcp:localhost:4444
migration will fail on hosts that have both IPv4 and IPV6 address for localhost.

To fix this, refactor address resolution code and make inet_nonblocking_connect
retry connection with a different address.

Michael S. Tsirkin (1):
  Refactor inet_connect_opts function

Orit Wasserman (3):
  Separate inet_connect into inet_connect (blocking) and
    inet_nonblocking_connect
  Fix address handling in inet_nonblocking_connect
  Clear handler only for valid fd

 migration-tcp.c |   37 ++------
 migration.c     |    3 +-
 nbd.c           |    2 +-
 qemu-char.c     |    2 +-
 qemu-sockets.c  |  246 +++++++++++++++++++++++++++++++++++++++---------------
 qemu_socket.h   |   45 ++++++++++-
 ui/vnc.c        |    2 +-
 7 files changed, 233 insertions(+), 104 deletions(-)

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1.7.7.6