This function searches the services database until a matching
    service name is found or the end of file is encountered. If a
    protocol name is also supplied, searches must also match the
    protocol.
    This function returns a pointer to a servent structure containing
    the data from the network services database. For information
    about the servent structure, refer to servent Structure.
    All information is contained in a static area, so it must be
    copied to be saved.
    Related Functions
    See also getservbyport().