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     SRV(2)                                                     SRV(2)

     NAME
          srv - network name and address translation when hosted

     SYNOPSIS
          include "srv.m"
          srv := load Srv Srv->PATH;
          Srv: module
          {
            init:  fn();
            iph2a: fn(host: string): list of string;
            ipa2h: fn(addr: string): list of string;
            ipn2p: fn(protocol, service: string): string;
          };

     DESCRIPTION
          Srv provides access to the host operating system's name and
          address translation when Inferno is running hosted.  The
          module's implementation is usually built-in to emu(1), and
          then only on some platforms.  It uses the Internet name res-
          olution services of the host operating system (eg,
          gethostbyname on Unix systems).  Its services are normally
          only used internally by cs(8) and dns(8), and even they give
          priority to data in services(6) and dns(6) if available.
          Other Inferno applications normally give network addresses
          to the functions of dial(2), and they are then translated
          automatically, using the services of cs(8).

          Init must be called before any other function is used.

          Given a host name, iph2a returns a list of its Internet
          addresses (if any).  Given an Internet address, ipa2h
          returns a list of host names (if any) that have that
          address.  The results are only as accurate as the host
          system's name service.

          Ipn2p returns the port number (as a string) for the given
          service when accessed using a particular protocol protocol
          (typically tcp or udp).

     SOURCE
          /emu/port/srv.c

     SEE ALSO
          sys-file2chan(2), cs(8), dns(8)

     Page 1                       Plan 9            (printed 11/23/24)