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Top Forums Programming How detect TCP/IP socket shutdown when ethernet cable is disconnected Post 302435857 by Corona688 on Thursday 8th of July 2010 10:42:48 AM
Old 07-08-2010
TCP does best-effort delivery, which is why it has such obnoxiously long timeouts. I've seen it survive 10-minute network outages. It's really not designed to do what you want. Try pinging your host to see if it responds or not.
 

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rusers(1)						      General Commands Manual							 rusers(1)

NAME
rusers - determine who is logged in on machines on local network SYNOPSIS
[host ...] DESCRIPTION
produces output similar to the "quick" option of who(1), but for remote machines. It broadcasts on the local network and prints the responses it receives. Though the listing is normally in the order that responses are received, the order can be changed by specifying a command-line option. The broadcast process takes about two minutes. When host arguments are given, instead of broadcasting, only queries the list of specified hosts. For each machine, the default is to print a line listing the host name and all users on that host. When the option is given, uses an out- put format similar to rwho(1). If a user has not typed on the system for a minute or more, the idle time is reported. A remote host only responds if it is running the rusersd(1M) daemon. Options recognizes the following command-line options: Give a report for a machine even if no users are logged in on it. Sort alphabetically by host name. Sort by idle time. Give a longer listing in the style of (see who(1)). Sort by number of users. RETURN VALUE
returns exit code zero if no errors are encountered; otherwise it returns the number of errors found. AUTHOR
was developed by Sun Microsystems, Inc. WARNINGS
Broadcasting does not work through gateways; therefore, does not report information about machines that are reached only through gateways. FILES
SEE ALSO
rwho(1), who(1), inetd(1M), rusersd(1M). rusers(1)
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