ceph/src/boost/boost/process/detail/posix/is_running.hpp

   1 // Copyright (c) 2106 Klemens D. Morgenstern
   2 //
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifndef BOOST_PROCESS_DETAIL_POSIX_IS_RUNNING_HPP
   7 #define BOOST_PROCESS_DETAIL_POSIX_IS_RUNNING_HPP
   8
   9 #include <boost/process/detail/config.hpp>
  10 #include <boost/process/detail/posix/child_handle.hpp>
  11 #include <system_error>
  12 #include <sys/wait.h>
  13
  14 namespace boost { namespace process { namespace detail { namespace posix {
  15
  16
  17 constexpr int still_active = 0x7F;
  18 static_assert(!WIFEXITED(still_active), "Internal Error");
  19
  20 inline bool is_running(const child_handle &p, int & exit_code)
  21 {
  22     int status;
  23     auto ret = ::waitpid(p.pid, &status, WNOHANG|WUNTRACED);
  24
  25     if (ret == -1)
  26     {
  27         if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously.
  28             ::boost::process::detail::throw_last_error("is_running error");
  29
  30         return false;
  31     }
  32     else if (ret == 0)
  33         return true;
  34     else //exited
  35     {
  36         if (WIFEXITED(status))
  37             exit_code = status;
  38         return false;
  39     }
  40 }
  41
  42 inline bool is_running(const child_handle &p, int & exit_code, std::error_code &ec) noexcept
  43 {
  44     int status;
  45     auto ret = ::waitpid(p.pid, &status, WNOHANG|WUNTRACED);
  46
  47     if (ret == -1)
  48     {
  49         if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously.
  50             ec = ::boost::process::detail::get_last_error();
  51         return false;
  52     }
  53     else if (ret == 0)
  54         return true;
  55     else
  56     {
  57         ec.clear();
  58
  59         if (WIFEXITED(status))
  60             exit_code = status;
  61
  62         return false;
  63     }
  64 }
  65
  66 inline bool is_running(int code)
  67 {
  68     return !WIFEXITED(code);
  69 }
  70
  71 inline int eval_exit_status(int code)
  72 {
  73     return WEXITSTATUS(code);
  74 }
  75
  76 }}}}
  77
  78 #endif