inetd(1M) manual page
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inetd - Internet services daemon
inetd [ -d ] [ -s ] [
-t ] [ -r count interval ] [ configuration-file ]
SUNWcsu
inetd is the server process for the Internet standard services. It is
usually started up at system boot time. The configuration-file lists the
services that inetd is to provide. If no configuration-file is given on the
command line, inetd reads its configuration information from the file /etc/inetd.conf.
See inetd.conf(4)
for more information on the format of this file. inetd
listens for service requests on the TCP or UDP ports associated with each
of the service listed in the configuration file. When a request arrives,
inetd executes the server program associated with the service.
A service
can be configured to be ‘‘single-threaded’’, in which case inetd waits for the
server process to exit before starting a second server process. RPC services
can also be started by inetd.
inetd provides a number of simple Internet
services internally. These include echo, discard, chargen (character generator),
daytime (human-readable time), and time (machine-readable time, in the form
of the number of seconds since midnight, January 1, 1900).
inetd rereads
its configuration file once when it is started and again whenever it receives
a hangup signal,
SIGHUP. New services can be activated, and existing services
deleted or modified by editing the configuration file, then sending inetd
a
SIGHUP signal.
- -d
- Runs inetd in the foreground and enables debugging
output.
- -s
- Allows you to run inetd ‘‘stand-alone,’’ outside the Service Access
Facility (SAF). If the -s option is omitted, inetd will attempt to contact
the service access controller (SAC) and will exit if SAC is not already
running. See sac(1M)
.
- -t
- Instructs inetd to trace the incoming connections
for all of its TCP services. It does this by logging the client’s IP address
and TCP port number, along with the name of the service, using the syslog(3)
facility. UDP services can not be traced. When tracing is enabled, inetd
uses the syslog facility code ‘‘daemon’’ and ‘‘notice’’ priority level.
- -r
- Allows
inetd to detect and then suspend ‘‘broken’’ servers. The -r flag has the form:
- -r
- count interval
- count
- and interval are decimal numbers that represent
the maximum count of invocations per interval of seconds a service may
be started before the service is considered ‘‘broken’’.
- Once considered ‘‘broken’’,
a server is suspended for ten minutes. After ten
- minutes, inetd again enables
service, hoping the server behaves correctly.
- If the
- -r flag is not specified,
inetd behaves as though -r40 60 was specified.
- configuration-file
- Lists the services inetd is to provide.
inetd does not return
an Exit Status.
in.ftpd(1M)
, in.rexecd(1M)
, in.rshd(1M)
, in.tftpd(1M)
,
sac(1M)
, inetd.conf(4)
Postel, Jon, ‘‘Echo Protocol,’’ RFC 862, Network Information
Center, SRI International, Menlo Park, CA, May 1983.
Postel, Jon, ‘‘Discard
Protocol,’’ RFC 863, Network Information Center, SRI International, Menlo
Park, CA, May 1983.
Postel, Jon, ‘‘Character Generator Protocol,’’ RFC 864,
Network Information Center, SRI International, Menlo Park, CA, May 1983.
Postel, Jon, ‘‘Daytime Protocol,’’ RFC 867, Network Information Center, SRI
International, Menlo Park, CA, May 1983.
Postel, Jon, and Ken Harrenstien,
‘‘Time Protocol,’’ RFC 868, Network Information Center, SRI International,
Menlo Park, CA, May 1983.
Do not configure udp services as nowait.
This will cause a race condition where the inetd program selects on the
socket and the server program reads from the socket. Many server programs
will be forked and performance will be severely compromised.
For RPC
services, inetd listens on all the transports (not only tcp and udp) as
specified for each service in the inetd.conf(4)
file.
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