How can I program socket in unix?

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LEARN ABOUT DEBIAN

socket-event

socket-event(8) 					      System Manager's Manual						   socket-event(8)

NAME

       socket - event signalling that a socket connection has been made

SYNOPSIS

       socket PROTO=PROTO PORT=PORT ADDR=ADDR

       socket PROTO=PROTO PATH=PATH

DESCRIPTION

       The  socket event is generated by the upstart-socket-bridge(8) daemon when a socket connection is made whose details match the socket event
       condition and environment specified in a jobs start on or stop on stanza.

       When an incoming connection is detected, the file descriptor representing the socket is passed to the  job  in  question  to  allow  it	to
       accept(2) the connection. Additionally, the environment variable UPSTART_JOB will contain the name of the event ("socket") and the environ-
       ment variable UPSTART_FDS will contain the number of the file descriptor corresponding to the listening socket.

EXAMPLES

   Internet socket
       Start web server when first client connects from localhost:

	      start on socket PROTO=inet PORT=80 ADDR=127.0.0.1

   Local socket
	      start on socket PROTO=unix PATH=/var/run/.s.pgsql.1234

   Abstract socket
	      start on socket PROTO=unix PATH=@/at/upstart/example

AUTHOR

       Written by Scott James Remnant <scott@netsplit.com>

       Manual page written by James Hunt <james.hunt@ubuntu.com>

BUGS

       Report bugs at <https://launchpad.net/upstart/+bugs>

COPYRIGHT

       Copyright (C) 2011 Canonical Ltd.

       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       init(5) init(8) socket(2) socket(7) upstart-socket-bridge(8)

upstart 							    2011-03-08							   socket-event(8)

Programming