widget/LSBUtils.cpp
author Chris H-C <chutten@mozilla.com>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 308038 de07c5af9cc8975d82cbb5dde8cd2a64dc3d8b42
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "LSBUtils.h"

#include <unistd.h>
#include "base/process_util.h"

namespace mozilla {
namespace widget {
namespace lsb {

static const char* gLsbReleasePath = "/usr/bin/lsb_release";

bool
GetLSBRelease(nsACString& aDistributor,
              nsACString& aDescription,
              nsACString& aRelease,
              nsACString& aCodename)
{
  if (access(gLsbReleasePath, R_OK) != 0)
    return false;

  int pipefd[2];
  if (pipe(pipefd) == -1) {
    NS_WARNING("pipe() failed!");
    return false;
  }

  std::vector<std::string> argv = {
    gLsbReleasePath, "-idrc"
  };

  std::vector<std::pair<int, int>> fdMap = {
    { pipefd[1], STDOUT_FILENO }
  };

  base::ProcessHandle process;
  base::LaunchApp(argv, fdMap, true, &process);
  close(pipefd[1]);
  if (!process) {
    NS_WARNING("Failed to spawn lsb_release!");
    close(pipefd[0]);
    return false;
  }

  FILE* stream = fdopen(pipefd[0], "r");
  if (!stream) {
    NS_WARNING("Could not wrap fd!");
    close(pipefd[0]);
    return false;
  }

  char dist[256], desc[256], release[256], codename[256];
  if (fscanf(stream, "Distributor ID:\t%255[^\n]\n"
                     "Description:\t%255[^\n]\n"
                     "Release:\t%255[^\n]\n"
                     "Codename:\t%255[^\n]\n",
             dist, desc, release, codename) != 4)
  {
    NS_WARNING("Failed to parse lsb_release!");
    fclose(stream);
    close(pipefd[0]);
    return false;
  }
  fclose(stream);
  close(pipefd[0]);

  aDistributor.Assign(dist);
  aDescription.Assign(desc);
  aRelease.Assign(release);
  aCodename.Assign(codename);
  return true;
}

}  // namespace lsb
}  // namespace widget
}  // namespace mozilla