R: getsockopt(SO_KEEPALIVE) returns incorrect option length

[Marco Atzeri]

--- Ven 2/7/10, Pavel Holejsovsky ha scritto:

> Hi,
> 
> I think that following problem shows problematic behavior
> in cygwin 1.7.5, at least incompatible with linux:
> 
> #include <stdio.h>
> #include <sys/socket.h>
> 
> int main() {
>         int sock, option, optlen =
> sizeof(int);
>         sock = socket(AF_INET,
> SOCK_STREAM, 0);
>         getsockopt(sock, SOL_SOCKET,
> SO_KEEPALIVE, &option, &optlen);
>         printf("option=%d,
> optlen=%d\n", option, optlen);
>         return 0;
> }
> 
> Prints optlen=1, while it is expected to be sizeof(int),
> i.e. 4.
> 
> 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.
> 
> This issue is relevant:
> 
> SO_KEEPALIVE value is actually a char on Windows, not BOOL
> https://bugzilla.gnome.org/show_bug.cgi?id=611756
> 
> And causes glib gio 2.24 to fail certain socket operations
> on cygwin.
> 
> thanks,
> Pavel

option=0, optlen=4

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


MArco






--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple