KAPTAIN(1) General Commands Manual KAPTAIN(1)NAME
kaptain - Universal graphical front-end for command-line programs.
SYNOPSIS
kaptain [options] file
DESCRIPTION
kaptain reads the given file and builds a user-friendly dialog according to the grammar rules found in it.
See info kaptain for a detailed overview.
OPTIONS
kaptain accepts the following options:
-h, --help
Show summary of options.
-V Run in verbose mode.
--version
Show version of program.
--test Run in test mode. This means that commands are not executed when a button is pressed, only printed to the standard output.
-V, --verbose
Report more information on processing the input file. Internal representation of the grammar and the dialog tree is also printed.
Use this flag if Kaptain does not work as expected.
-c <host:port>, --client <host:port>
Establish communication channel as a client connecting to a server on <host> listening on <port>.
-s <port>, --server <port>
Listen to the specified <port> and accept the first connection. This will be used as a communication channel.
-p <command>, --pipe <command>
Start the given command and communicate with it on its standard input and output. Don't forget to quote <command> if it contains
spaces or other metacharacters used by the shell.
--stdio
Use standard input and output for communication. In this case you must specify an input file, thus grammar script cannot be read
from the standard input when it is used as a communication channel.
--no-input
Instructs Kaptain not to process messages received on the input channel.
--no-output
If this flag is set, Kaptain will not send any messages on its output channel.
AUTHOR
Zsolt Terek <terek@users.sourceforge.net>.
September 11, 2004 KAPTAIN(1)
Check Out this Related Man Page
socket(n) Tcl Built-In Commands socket(n)
__________________________________________________________________________________________________________________________________________________NAME
socket - Open a TCP network connection
SYNOPSIS
socket ?options? host port
socket -server command ?options? port
_________________________________________________________________DESCRIPTION
This command opens a network socket and returns a channel identifier that may be used in future invocations of commands like read, puts and
flush. At present only the TCP network protocol is supported; future releases may include support for additional protocols. The socket
command may be used to open either the client or server side of a connection, depending on whether the -server switch is specified.
CLIENT SOCKETS
If the -server option is not specified, then the client side of a connection is opened and the command returns a channel identifier that
can be used for both reading and writing. Port and host specify a port to connect to; there must be a server accepting connections on
this port. Port is an integer port number and host is either a domain-style name such as www.sunlabs.com or a numerical IP address such as
127.0.0.1. Use localhost to refer to the host on which the command is invoked.
The following options may also be present before host to specify additional information about the connection:
-myaddr addr
Addr gives the domain-style name or numerical IP address of the client-side network interface to use for the connection. This
option may be useful if the client machine has multiple network interfaces. If the option is omitted then the client-side interface
will be chosen by the system software.
-myport port
Port specifies an integer port number to use for the client's side of the connection. If this option is omitted, the client's port
number will be chosen at random by the system software.
-async The -async option will cause the client socket to be connected asynchronously. This means that the socket will be created immedi-
ately but may not yet be connected to the server, when the call to socket returns. When a gets or flush is done on the socket before
the connection attempt succeeds or fails, if the socket is in blocking mode, the operation will wait until the connection is com-
pleted or fails. If the socket is in nonblocking mode and a gets or flush is done on the socket before the connection attempt suc-
ceeds or fails, the operation returns immediately and fblocked on the socket returns 1.
SERVER SOCKETS
If the -server option is specified then the new socket will be a server for the port given by port. Tcl will automatically accept connec-
tions to the given port. For each connection Tcl will create a new channel that may be used to communicate with the client. Tcl then
invokes command with three additional arguments: the name of the new channel, the address, in network address notation, of the client's
host, and the client's port number.
The following additional option may also be specified before host:
-myaddr addr
Addr gives the domain-style name or numerical IP address of the server-side network interface to use for the connection. This
option may be useful if the server machine has multiple network interfaces. If the option is omitted then the server socket is
bound to the special address INADDR_ANY so that it can accept connections from any interface.
Server channels cannot be used for input or output; their sole use is to accept new client connections. The channels created for each
incoming client connection are opened for input and output. Closing the server channel shuts down the server so that no new connections
will be accepted; however, existing connections will be unaffected.
Server sockets depend on the Tcl event mechanism to find out when new connections are opened. If the application doesn't enter the event
loop, for example by invoking the vwait command or calling the C procedure Tcl_DoOneEvent, then no connections will be accepted.
CONFIGURATION OPTIONS
The fconfigure command can be used to query several readonly configuration options for socket channels: |
-error |
This option gets the current error status of the given socket. This is useful when you need to determine if an asynchronous connect |
operation succeeded. If there was an error, the error message is returned. If there was no error, an empty string is returned.
-sockname
This option returns a list of three elements, the address, the host name and the port number for the socket. If the host name cannot
be computed, the second element is identical to the address, the first element of the list.
-peername
This option is not supported by server sockets. For client and accepted sockets, this option returns a list of three elements; these
are the address, the host name and the port to which the peer socket is connected or bound. If the host name cannot be computed, the
second element of the list is identical to the address, its first element.
SEE ALSO
flush(n), open(n), read(n)
KEYWORDS
bind, channel, connection, domain name, host, network address, socket, tcp
Tcl 8.0 socket(n)