In local.glasgow-haskell-users, you wrote:

Fail: invalid argument Action: getSocketOption Reason: Invalid argument

even though there IS a listener on the socket (other programs can connect to it).

I have ghc-5.02 (binary package for SunOS) Any hints appreciated. how to find out what is invalid?

'truss' says: ... connect(3, 0x500BB040, 16, 1) Err#150 EINPROGRESS poll(0xFFBEF500, 1, 134218) = 1 getsockopt(3, 65535, 4103, 0x500BB058, 0x500BB064, 1) Err#22 EINVAL Which is highly suspicious: getsockopt should never return EINVAL, so something is seriously wrong. The interface is int getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen); Notice the last parameter. Passing just "1" can't be right. The manpage mentions that For getsockopt(), optlen is a value-result parameter, initially containing the size of the buffer pointed to by optval, and modified on return to indicate the actual size of the value returned. Use a 0 optval if no option value is to be supplied or returned. IMO it should be a pointer to a CInt containing "1". I'm currently getting ready a source-version of ghc to test this, but Slowlaris takes ages to build. I'd assume instead of 'alloca' it should be 'withObject'. Whatever. Maybe Simon M. finds a solution faster than me? -- Volker Stolz * stolz@i2.informatik.rwth-aachen.de * PGP + S/MIME