SOCKET
Section: User Commands (1)
Updated: Aug 6, 1992
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NAME
socket - create tcp socket and connect to stdin/out
SYNOPSIS
socket
[
-bcfqrvw
]
[
-p
command
]
host port
socket
[
-bcfqrvw
]
[
-p
command
]
-s
[
-l
]
port
DESCRIPTION
Socket
creates an Internet domain TCP socket and connects it to stdin and stdout.
The
host
argument can be an Internet number in dot-notation (like
``130.149.28.10'') or a domain name. In this case it must be possible
to resolve the name to a valid Internet address with
gethostbyname(3).
The
port
argument can be a port number or a service name which can be mapped to
a port number by
getservbyname(3).
OPTIONS
- -b (background)
-
The program forks itself into the background, detaches from its
controlling tty, closes the file descriptors associated with the tty,
and changes its current directory to the root directory.
- -c (crlf)
-
Linefeed characters (LF) are converted to a Carriage Return Linefeed
sequence (CRLF) when written to the socket.
CRLF sequences read from the socket are converted to a single LF.
- -f (fork)
-
When a server connection has been accepted, a separate process is
forked to handle the connection in background.
- -l (loop)
-
(only valid with
-s)
After a connection has been closed,
another connection is accepted.
- -p (program)
-
The specified
command
is executed for each connection. Its standard input, standard output,
and standard error channels are connected to the socket.
Command
can be any shell command since it is passed to /bin/sh.
- -q (quit)
-
The connection is closed when an end-of-file condition occurs on standard
input.
- -r (read only)
-
No data is read from standard input and written to the socket.
- -s (server)
-
A server socket is created.
A
hostname
argument is not required.
- -v (verbose)
-
Messages about connections etc. are issued to stderr.
- -w (write only)
-
No data is read from the socket and written to the standard output.
- -version
-
Socket
prints its version ID and terminates.
This must be the first argument to have an effect.
EXAMPLES
The command
-
socket -v coma.cs.tu-berlin.de nntp
connects to the nntp port (port 119) of coma.cs.tu-berlin.de
(130.149.28.10).
The command
-
socket -sl 3425
creates a server socket on port 3425 on the local host and waits for a
connection.
After a connection has been closed, a new connection is accepted.
The command
-
socket -wslqvp "echo Socket! " 1938
creates a server socket on port 1938 on the local host and waits for a
connection.
When a connection is accepted, the string "Socket!" is written to the
socket.
No data is read from the socket and written to the finger
program.
The connection is closed when an end-of-file condition at the standard
output of the program occurs.
Then a new connection is accepted.
DIAGNOSTICS
Lots of diagnostics for failed system calls.
- unknown host host
-
host's
address could not be resolved.
- Signal signal caught, exiting
-
Socket
exits on any signal other than SIGTSTP, SIGCONT, SIGCLD, SIGQUIT.
A non-zero exit code is returned if
socket
terminates due to an error condition or a signal.
SEE ALSO
accept(2),
bind(2),
connect(2),
socket(2),
gethostbyname(3),
getservbyname(3)
BUGS
socket -p terminates due to a SIGPIPE signal when there is more
data from the socket available than the executed program wants to
read.
Please report any other bugs to the author.
VERSION
This manual page describes Socket-1.1.
AUTHOR
Juergen Nickelsen <nickel@cs.tu-berlin.de>
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- EXAMPLES
-
- DIAGNOSTICS
-
- SEE ALSO
-
- BUGS
-
- VERSION
-
- AUTHOR
-
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