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TM1300/PNX1300系列DSP（主要用于视频处理）操作系统pSOS系统的几个demo

   This example demonstrates use of the pSOS library 'dns', which allows
a TriMedia-based application to use the dynamic host-name lookup
facilities of the Internet.

   After including the header file <dns.h> and calling the
initialisation function res_start(), the following calls are available:

      char *name = (*a host name, e g, "www.altavista.com"*);
      char addr [4] = (*a host address, e g, "{127, 0, 0, 1}*);
      struct hostent host; /*buffer to receive result*/

      int gethostbyname (name, &host);
      int gethostbyaddr (addr, sizeof addr, AF_INET, &host);
      
   Afterwards, the "host" structure has been filled in with

      host.h_name      The official name of host
      host.h_aliases   An alias list---always NULL
      host.h_addrtype  Host address type---always AF_INET
      host.h_length    Length of address---always 4 for I P
      host.h_addr_list A pointer to a NULL_terminated array of
                       pointers to I P addresses.

   The example program sits in a loop reading host names from the
user. Each name is passed to gethostbyname() and the address is printed
out. A blank line terminates the program.

   Host communication is done via the SerialRPC library, which
implements the TriMedia host interface over the internet.