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Date: Fri, 2 Jul 2010 10:01:02 +0000 (GMT)
From: Marco Atzeri <marco_atzeri AT yahoo DOT it>
Subject: R: getsockopt(SO_KEEPALIVE) returns incorrect option length
To: cygwin AT cygwin DOT com, Pavel Holejsovsky <pavel DOT holejsovsky AT upek DOT com>
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--- Ven 2/7/10, Pavel Holejsovsky ha scritto:

> Hi,
>=20
> I think that following problem shows problematic behavior
> in cygwin 1.7.5, at least incompatible with linux:
>=20
> #include <stdio.h>
> #include <sys/socket.h>
>=20
> int main() {
> =A0 =A0 =A0 =A0 int sock, option, optlen =3D
> sizeof(int);
> =A0 =A0 =A0 =A0 sock =3D socket(AF_INET,
> SOCK_STREAM, 0);
> =A0 =A0 =A0 =A0 getsockopt(sock, SOL_SOCKET,
> SO_KEEPALIVE, &option, &optlen);
> =A0 =A0 =A0 =A0 printf("option=3D%d,
> optlen=3D%d\n", option, optlen);
> =A0 =A0 =A0 =A0 return 0;
> }
>=20
> Prints optlen=3D1, while it is expected to be sizeof(int),
> i.e. 4.
>=20
> This is most probably because uinderlying winsock call has
> this (mis)behavior, but I think that in cygwin layer this
> could be worked around to be more unix compatible.
>=20
> This issue is relevant:
>=20
> SO_KEEPALIVE value is actually a char on Windows, not BOOL
> https://bugzilla.gnome.org/show_bug.cgi?id=3D611756
>=20
> And causes glib gio 2.24 to fail certain socket operations
> on cygwin.
>=20
> thanks,
> Pavel

option=3D0, optlen=3D4

on XP-sp2, cygwin 1.7.5s(0.227/5/3) 20100628


MArco






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