Socket: non-blocking connect and getsockopt SO_ERROR
Mon May 16 12:43:00 GMT 2011
I am experiencing an issue with getsockopt when running an application
The application (Kannel sms gateway) creates a new socket, attempt to
connect non-blocking to the other host and later calls getsockopt to
check for errors:
s = socket(PF_INET, SOCK_STREAM, 0);
flags = fcntl(s, F_GETFL, 0);
fcntl(s, F_SETFL, flags | O_NONBLOCK);
connect(s, &addr, sizeof(addr))
connect returns EINPROGRESS and the application has a polling thread
setup to handle timeout and check for changes. In both cases a callback
function is invoked.
The callback function checks the connection by calling
getsockopt(s, SOL_SOCKET, SO_ERROR, &err, &len)
but it returns 0 and no error - even if the connection was never
established. Subsequently the application tries to write data to the
socket - which fails with a "transport endpoint is not connected" error.
The code works just fine on Linux with getsockopt returning an error.
Any pointer on how to get this working will be greatly appreciated.
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