VMS Help TCPIP Services, Programming Interfaces, Sockets API, socket(), Errors  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    EACCES             The process does not have sufficient
                       privileges.
    EAFNOSUPPORT       The specified address family is not supported
                       in this version of the system.
    EMFILE             The per-process descriptor table is full.
    ENETDOWN           TCP/IP Services was not started.
    ENFILE             No more file descriptors are available for the
                       system.
    ENOBUFS            The system has insufficient resources to
                       complete the call.
    ENOMEM             The system was unable to allocate kernel
                       memory to increase the process descriptor
                       table.
    EPERM              The process is attempting to open a raw socket
                       and does not have SYSTEM privilege.
    EPROTONOSUPPORT    The socket in the specified address family is
                       not supported.
    EPROTOTYPE         The socket type is not supported by the
                       protocol.
    ESOCKTNOSUPPORT    The specified socket type is not supported in
                       this address family.