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qemu-char: Add reconnecting to client sockets

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Adds a "reconnect" option to socket backends that gives a reconnect
timeout.  This only applies to client sockets.  If the other end
of a socket closes the connection, qemu will attempt to reconnect
after the given number of seconds.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Corey Minyard 2014-10-02 11:17:37 -05:00 • committed by Paolo Bonzini
parent 16cc4ffe34
commit 5dd1f02b4b
3 changed files with 96 additions and 17 deletions
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20
qemu-options.hx
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@ -1930,9 +1930,9 @@ ETEXI
DEF("chardev", HAS_ARG, QEMU_OPTION_chardev,
"-chardev null,id=id[,mux=on|off]\n"
"-chardev socket,id=id[,host=host],port=port[,to=to][,ipv4][,ipv6][,nodelay]\n"
" [,server][,nowait][,telnet][,mux=on|off] (tcp)\n"
"-chardev socket,id=id,path=path[,server][,nowait][,telnet],[mux=on|off] (unix)\n"
"-chardev socket,id=id[,host=host],port=port[,to=to][,ipv4][,ipv6][,nodelay][,reconnect=seconds]\n"
" [,server][,nowait][,telnet][,reconnect=seconds][,mux=on|off] (tcp)\n"
"-chardev socket,id=id,path=path[,server][,nowait][,telnet][,reconnect=seconds][,mux=on|off] (unix)\n"
"-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]\n"
" [,localport=localport][,ipv4][,ipv6][,mux=on|off]\n"
"-chardev msmouse,id=id[,mux=on|off]\n"
@ -2004,7 +2004,7 @@ Options to each backend are described below.
A void device. This device will not emit any data, and will drop any data it
receives. The null backend does not take any options.
@item -chardev socket ,id=@var{id} [@var{TCP options} or @var{unix options}] [,server] [,nowait] [,telnet]
@item -chardev socket ,id=@var{id} [@var{TCP options} or @var{unix options}] [,server] [,nowait] [,telnet] [,reconnect=@var{seconds}]
Create a two-way stream socket, which can be either a TCP or a unix socket. A
unix socket will be created if @option{path} is specified. Behaviour is
@ -2018,6 +2018,10 @@ connect to a listening socket.
@option{telnet} specifies that traffic on the socket should interpret telnet
escape sequences.
@option{reconnect} sets the timeout for reconnecting on non-server sockets when
the remote end goes away. qemu will delay this many seconds and then attempt
to reconnect. Zero disables reconnecting, and is the default.
TCP and unix socket options are given below:
@table @option
@ -2687,14 +2691,16 @@ telnet on port 5555 to access the QEMU port.
localhost 5555
@end table
@item tcp:[@var{host}]:@var{port}[,@var{server}][,nowait][,nodelay]
@item tcp:[@var{host}]:@var{port}[,@var{server}][,nowait][,nodelay][,reconnect=@var{seconds}]
The TCP Net Console has two modes of operation. It can send the serial
I/O to a location or wait for a connection from a location. By default
the TCP Net Console is sent to @var{host} at the @var{port}. If you use
the @var{server} option QEMU will wait for a client socket application
to connect to the port before continuing, unless the @code{nowait}
option was specified. The @code{nodelay} option disables the Nagle buffering
algorithm. If @var{host} is omitted, 0.0.0.0 is assumed. Only
algorithm. The @code{reconnect} option only applies if @var{noserver} is
set, if the connection goes down it will attempt to reconnect at the
given interval. If @var{host} is omitted, 0.0.0.0 is assumed. Only
one TCP connection at a time is accepted. You can use @code{telnet} to
connect to the corresponding character device.
@table @code
@ -2715,7 +2721,7 @@ MAGIC_SYSRQ sequence if you use a telnet that supports sending the break
sequence. Typically in unix telnet you do it with Control-] and then
type "send break" followed by pressing the enter key.
@item unix:@var{path}[,server][,nowait]
@item unix:@var{path}[,server][,nowait][,reconnect=@var{seconds}]
A unix domain socket is used instead of a tcp socket. The option works the
same as if you had specified @code{-serial tcp} except the unix domain socket
@var{path} is used for connections.