[lwip-devel] [task #6930] Impelemt SO_LINGER

[Simon Goldschmidt]

Follow-up Comment #2, task #6930 (project lwip):

Re comment #1
As Jonathan said in bug #19157:
"SO_DONTLINGER is a non-standard option. I would be against its provision in
lwIP on that basis"

That's my point of view, too. Anyway, can't linger be turned off by calling
setsockopt(SO_LINGER) with l_onoff=0? Doesn't that achieve the same?


http://docs.hp.com/en/B2355-90136/ch03s01.html seems a little different from
http://www.opengroup.org/onlinepubs/000095399/basedefs/sys/socket.h.html
because the opengroup specification allows l_linger to provide a time,
whereas hp only sets it on or off. Still, the HP link provides a good
explanation:

>>>

* If l_onoff is zero, close returns immediately, but any unsent data is
transmitted (after close returns).
* If l_onoff is nonzero and l_linger is zero, close returns immediately, and
any unsent data is discarded.
* If l_onoff is nonzero and l_linger is nonzero, close does not return until
all unsent data is transmitted (or the connection is closed by the remote
system).

In the default case (SO_LINGER is off), close is not blocked. The socket
itself, however, goes through graceful disconnect, and no data is lost.
<<<

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