ceph/src/common/hostname.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #include "common/hostname.h"
  16
  17 #include <unistd.h>
  18
  19 #include "include/compat.h"
  20
  21 std::string ceph_get_hostname()
  22 {
  23   // are we in a container?  if so we would prefer the *real* hostname.
  24   const char *node_name = getenv("NODE_NAME");
  25   if (node_name) {
  26     return node_name;
  27   }
  28
  29   char buf[1024];
  30   gethostname(buf, 1024);
  31   return std::string(buf);
  32 }
  33
  34 std::string ceph_get_short_hostname()
  35 {
  36   std::string hostname = ceph_get_hostname();
  37   size_t pos = hostname.find('.');
  38   if (pos == std::string::npos)
  39   {
  40     return hostname;
  41   }
  42   else
  43   {
  44     return hostname.substr(0, pos);
  45   }
  46 }