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telnetd: add -w ("inetd wait") option. Can be configured off.

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gcc fils to fully optimize it out when it's off:

function                                             old     new   delta
telnetd_main                                        1527    1548     +21
packed_usage                                       26596   26587      -9

but nevertheless it's a useful (and so far single) example
how to write "inetd wait" tcp service.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2009-09-04 02:21:13 +02:00
parent cfc216345e
commit ed1667e8ee
3 changed files with 69 additions and 28 deletions
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21
networking/Config.in
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@@ -788,6 +788,27 @@ config FEATURE_TELNETD_STANDALONE
help
Selecting this will make telnetd able to run standalone.
config FEATURE_TELNETD_INETD_WAIT
bool "Support -w SEC option (inetd wait mode)"
default n
depends on FEATURE_TELNETD_STANDALONE
help
This option allows you to run telnetd in "inet wait" mode.
Example inetd.conf line (note "wait", not usual "nowait"):
telnet stream tcp wait root /bin/telnetd telnetd -w10
In this example, inetd passes _listening_ socket_ as fd 0
to telnetd when connection appears.
telnetd will wait for connections until all existing
connections are closed, and no new connections
appear during 10 seconds. Then it exits, and inetd continues
to listen for new connections.
This option is rarely used. "tcp nowait" is much more usual
way of running tcp services, including telnetd.
You most probably want to say N here.
config TFTP
bool "tftp"
default n