.. _program_listing_file_BackendLibfabric_Helpers.cpp:

Program Listing for File Helpers.cpp
====================================

|exhale_lsh| :ref:`Return to documentation for file <file_BackendLibfabric_Helpers.cpp>` (``BackendLibfabric/Helpers.cpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #include "Helpers.hpp"
   
   #include <string>
   #include <tracy/Tracy.hpp>
   
   #include <ers/ers.h>
   
   #include <rdma/fi_cm.h>
   
   #include "Issues.hpp"
   
   std::string netio3::libfabric::get_provider(NetworkMode mode)
   {
     switch (mode) {
     case NetworkMode::TCP:
       return "sockets";
     case NetworkMode::RDMA:
       return "verbs";
     default:
       throw LibFabricError(ERS_HERE, "Unknown network mode");
     }
   }
   
   netio3::EndPointAddress netio3::libfabric::peer_address(fid_ep* ep)
   {
     ZoneScoped;
     std::array<char, BUFSIZ> address{};
     auto addrlen = address.size();
     const auto ret = fi_getpeer(ep, address.data(), &addrlen);
     ERS_DEBUG(2, std::format("ret={} Peer address length={}", ret, addrlen));
     for (size_t ch = 0; ch < addrlen; ++ch) {
       ERS_DEBUG(3, std::format("Peer address val={:#x}", address.at(ch)));
     }
     if (ret != 0) {
       ers::error(LibFabricError(ERS_HERE, std::format("fi_getpeer failed: {}", fi_strerror(-ret))));
     }
     static std::array<char, BUFSIZ> namebuf;
     static std::array<char, BUFSIZ> servbuf;
     const int errcode = getnameinfo(reinterpret_cast<const sockaddr*>(address.data()),
                                     addrlen,
                                     namebuf.data(),
                                     BUFSIZ,
                                     servbuf.data(),
                                     BUFSIZ,
                                     NI_NUMERICHOST | NI_NUMERICSERV);
     if (errcode != 0) {
       if (errcode != EAI_SYSTEM) {
         ers::error(LibFabricError(
           ERS_HERE,
           std::format("getnameinfo for {} failed: {}", address.data(), gai_strerror(errcode))));
       } else {
         ers::error(LibFabricError(ERS_HERE,
                                   std::format("getnameinfo for {} failed: {}",
                                               address.data(),
                                               utility::error_message(errno))));
       }
     }
     return {std::string(namebuf.data()), static_cast<unsigned short>(atoi(servbuf.data()))};
   }