Creating passive TCP sockets

        [[service]] = service associated with the desired port (may be a name
        or a decimal number); [[qlen]] = maximum server request queue length
        (should be a small number, usual maximum is 5).
        
<<*>>=
#include <config.h>
#include "passivesock.e"

EXPORT int passiveTCP(char *service, int qlen)
{
    return passivesock(service, "tcp", qlen);
}