ceph/src/jaegertracing/jaeger-client-cpp/src/jaegertracing/platform/Hostname.h

   1 /*
   2  * Copyright (c) 2017 Uber Technologies, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef JAEGERTRACING_PLATFORM_HOSTNAME_H
  18 #define JAEGERTRACING_PLATFORM_HOSTNAME_H
  19
  20 #include <errno.h>
  21 #include <string>
  22 #include <system_error>
  23
  24 #ifdef WIN32
  25 #include <Winsock2.h>
  26 #else
  27 #include <unistd.h>
  28 #endif
  29
  30 #ifdef _MSC_VER
  31 #pragma warning(push)
  32 #pragma warning(disable : 4267)
  33 #endif
  34
  35 namespace jaegertracing {
  36 namespace platform {
  37
  38 inline std::string hostname()
  39 {
  40     constexpr auto kBufferSize = 256;
  41     std::string buffer(kBufferSize, '\0');
  42     const auto returnCode = ::gethostname(&buffer[0], buffer.size());
  43     if (returnCode != 0) {
  44         throw std::system_error(
  45             errno, std::system_category(), "Failed to get hostname");
  46     }
  47     const auto nullPos = buffer.find('\0');
  48     return buffer.substr(0, nullPos);
  49 }
  50
  51 }  // namespace platform
  52 }  // namespace jaegertracing
  53
  54 #ifdef _MSC_VER
  55 #pragma warning(pop)
  56 #endif
  57
  58 #endif  // JAEGERTRACING_PLATFORM_HOSTNAME_H