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Full Discussion: Is this case is normal when programming in socket?
Top Forums Programming Is this case is normal when programming in socket? Post 302469364 by DGPickett on Friday 5th of November 2010 04:17:01 PM
Old 11-05-2010
Well, did you write a client or a server or both, and which did you have interactive when you and ^C and the shell killed it?

If you have root, lsof tells you more about sockets.

Using my u_inetd server and a high port, anyone can create a server, even with a shell script. I have not written a listener for a while, since this takes care of my every need.

If you write a client, and it connects, and you kill it, the connection established immediately transitions to another state on most systems.
Code:
$ psm 9090
UID       PID PPID C STIME  TTY TIME COMMAND
dgp     16824    1 0 Jun 14 ?   0:04 u_inetd 9090 http2env
 /home/dgp/myweb
$ (
netstat -an >/tmp/a
( echo hello ; sleep 2 )|telnet localhost 9090 &
sleep 1
netstat -an >/tmp/b
sleep 2
kill -9 $!
netstat -an >/tmp/c
diff /tmp/a /tmp/b |grep 9090
echo ====
diff /tmp/b /tmp/c |grep 9090
)
[1]     12205
Trying...
Connected to localhost.
Escape character is '^]'.
> tcp        0      0  127.0.0.1.9090         127.0.0.1.59702         ESTABLISHED
> tcp        0      0  127.0.0.1.59702        127.0.0.1.9090          ESTABLISHED
====
> tcp        0      0  127.0.0.1.59702        127.0.0.1.9090          TIME_WAIT
< tcp        0      0  127.0.0.1.9090         127.0.0.1.59702         ESTABLISHED
< tcp        0      0  127.0.0.1.59702        127.0.0.1.9090          ESTABLISHED
$

 

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LEARN ABOUT SUNOS

in.timed

in.timed(1M)						  System Administration Commands					      in.timed(1M)

NAME

       in.timed - UDP or TCP time protocol service daemon

SYNOPSIS

       in.timed

       FMRI
       svc:/internet/time:default

DESCRIPTION

       FMRI  stands  for  Fault  Management  Resource  Identifier.  It is used to identify resources managed by the Fault Manager. See fmd(1M) and
       smf(5).

       The in.timed service provides the server-side of the time protocol. The time server sends to requestors the time in seconds since midnight,
       January 1, 1900. The time protocol is available on both TCP and UDP transports through port 37.

       The in.timed service is an inetd(1M) smf(5) delegated service. The in.timed detects which transport is requested by examining the socket it
       is passed by the inetd daemon.

       TCP-based service

	   Once a connection is established, the in.timed sends the time as a 32-bit binary number and closes the connection. Any received data is
	   ignored.

       UDP-based service

	   The	in.timed  listens  for	UDP  datagrams.  When a datagram is received, the server generates a UDP datagram containing the time as a
	   32-bit binary number and sends it to the client. Any received data is ignored.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcnsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       inetd(1M), attributes(5), smf(5)

       RFC 868

SunOS 5.10							    23 Aug 2004 						      in.timed(1M)
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