C++ ProcessInstanceInfo::GetEnvironmentEntries方法代码示例

static bool
GetProcessAndStatInfo (lldb::pid_t pid, ProcessInstanceInfo &process_info, ProcessStatInfo &stat_info, lldb::pid_t &tracerpid)
{
    tracerpid = 0;
    process_info.Clear();
    ::memset (&stat_info, 0, sizeof(stat_info));
    stat_info.ppid = LLDB_INVALID_PROCESS_ID;

    // Use special code here because proc/[pid]/exe is a symbolic link.
    char link_path[PATH_MAX];
    char exe_path[PATH_MAX] = "";
    if (snprintf (link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", pid) <= 0)
        return false;

    ssize_t len = readlink (link_path, exe_path, sizeof(exe_path) - 1);
    if (len <= 0)
        return false;

    // readlink does not append a null byte.
    exe_path[len] = 0;

    // If the binary has been deleted, the link name has " (deleted)" appended.
    //  Remove if there.
    static const ssize_t deleted_len = strlen(" (deleted)");
    if (len > deleted_len &&
        !strcmp(exe_path + len - deleted_len, " (deleted)"))
    {
        exe_path[len - deleted_len] = 0;
    }
    else
    {
        GetELFProcessCPUType (exe_path, process_info);
    }

    process_info.SetProcessID(pid);
    process_info.GetExecutableFile().SetFile(exe_path, false);

    lldb::DataBufferSP buf_sp;

    // Get the process environment.
    buf_sp = ReadProcPseudoFile(pid, "environ");
    Args &info_env = process_info.GetEnvironmentEntries();
    char *next_var = (char *)buf_sp->GetBytes();
    char *end_buf = next_var + buf_sp->GetByteSize();
    while (next_var < end_buf && 0 != *next_var)
    {
        info_env.AppendArgument(next_var);
        next_var += strlen(next_var) + 1;
    }

    // Get the commond line used to start the process.
    buf_sp = ReadProcPseudoFile(pid, "cmdline");

    // Grab Arg0 first.
    char *cmd = (char *)buf_sp->GetBytes();
    process_info.SetArg0(cmd);

    // Now process any remaining arguments.
    Args &info_args = process_info.GetArguments();
    char *next_arg = cmd + strlen(cmd) + 1;
    end_buf = cmd + buf_sp->GetByteSize();
    while (next_arg < end_buf && 0 != *next_arg)
    {
        info_args.AppendArgument(next_arg);
        next_arg += strlen(next_arg) + 1;
    }

    // Read /proc/$PID/stat to get our parent pid.
    if (ReadProcPseudoFileStat (pid, stat_info))
    {
        process_info.SetParentProcessID (stat_info.ppid);
    }

    // Get User and Group IDs and get tracer pid.
    GetLinuxProcessUserAndGroup (pid, process_info, tracerpid);

    return true;
}

static bool GetProcessAndStatInfo(::pid_t pid,
                                  ProcessInstanceInfo &process_info,
                                  ProcessState &State, ::pid_t &tracerpid) {
  tracerpid = 0;
  process_info.Clear();

  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));

  // We can't use getProcFile here because proc/[pid]/exe is a symbolic link.
  llvm::SmallString<64> ProcExe;
  (llvm::Twine("/proc/") + llvm::Twine(pid) + "/exe").toVector(ProcExe);
  std::string ExePath(PATH_MAX, '\0');

  ssize_t len = readlink(ProcExe.c_str(), &ExePath[0], PATH_MAX);
  if (len <= 0) {
    LLDB_LOG(log, "failed to read link exe link for {0}: {1}", pid,
             Status(errno, eErrorTypePOSIX));
    return false;
  }
  ExePath.resize(len);

  // If the binary has been deleted, the link name has " (deleted)" appended.
  // Remove if there.
  llvm::StringRef PathRef = ExePath;
  PathRef.consume_back(" (deleted)");

  GetELFProcessCPUType(PathRef, process_info);

  // Get the process environment.
  auto BufferOrError = getProcFile(pid, "environ");
  if (!BufferOrError)
    return false;
  std::unique_ptr<llvm::MemoryBuffer> Environ = std::move(*BufferOrError);

  // Get the command line used to start the process.
  BufferOrError = getProcFile(pid, "cmdline");
  if (!BufferOrError)
    return false;
  std::unique_ptr<llvm::MemoryBuffer> Cmdline = std::move(*BufferOrError);

  // Get User and Group IDs and get tracer pid.
  if (!GetStatusInfo(pid, process_info, State, tracerpid))
    return false;

  process_info.SetProcessID(pid);
  process_info.GetExecutableFile().SetFile(PathRef, false);
  process_info.GetArchitecture().MergeFrom(HostInfo::GetArchitecture());

  llvm::StringRef Rest = Environ->getBuffer();
  while (!Rest.empty()) {
    llvm::StringRef Var;
    std::tie(Var, Rest) = Rest.split('\0');
    process_info.GetEnvironmentEntries().AppendArgument(Var);
  }

  llvm::StringRef Arg0;
  std::tie(Arg0, Rest) = Cmdline->getBuffer().split('\0');
  process_info.SetArg0(Arg0);
  while (!Rest.empty()) {
    llvm::StringRef Arg;
    std::tie(Arg, Rest) = Rest.split('\0');
    process_info.GetArguments().AppendArgument(Arg);
  }

  return true;
}