Network.recvFrom strangeness

Peter Simons simons at
Tue Sep 23 15:52:50 EDT 2003

The declaration of Network.recvFrom looks strange:

    recvFrom :: HostName -> PortID -> IO String

I thought that recvFrom should _return_ the address of the peer, not
require it as an argument? At least that's what the corresponding
4.4BSD routine does:

 |        ssize_t recvfrom(int s, void *buf, size_t len, int flags,
 |            struct sockaddr *from, socklen_t *fromlen);
 |        The recvfrom and recvmsg calls are used to receive messages
 |        from a socket, and may be used to receive data on a socket
 |        whether or not it is connection-oriented.
 |        If from is not NULL, and the socket is not connection-oriented,
 |        the source address of the message is filled in. The argument
 |        fromlen is a value-result parameter, initialized to the size of
 |        the buffer associated with from, and modified on return to
 |        indicate the actual size of the address stored there.

By the way: I am not sure whether HostName is the appropriate type
here! IMHO the routine should rather return the _address_ of the peer,
not the hostname. (For example, what does it return when the resolver


More information about the Libraries mailing list