The Tor Browser: ipc/chromium/src/base/process_util

ipc/chromium/src/base/process_util_posix.cc@6474c204b198 (annotated)

ipc/chromium/src/base/process_util_posix.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 //* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/resource.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
 #include <limits>
 #include <set>
 #include "base/basictypes.h"
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
 #include "base/platform_thread.h"
 #include "base/process_util.h"
 #include "base/scoped_ptr.h"
 #include "base/sys_info.h"
 #include "base/time.h"
 #include "base/waitable_event.h"
 #include "base/dir_reader_posix.h"
 const int kMicrosecondsPerSecond = 1000000;
 namespace base {
 ProcessId GetCurrentProcId() {
   return getpid();
 }
 ProcessHandle GetCurrentProcessHandle() {
   return GetCurrentProcId();
 }
 bool OpenProcessHandle(ProcessId pid, ProcessHandle* handle) {
   // On Posix platforms, process handles are the same as PIDs, so we
   // don't need to do anything.
   *handle = pid;
   return true;
 }
 bool OpenPrivilegedProcessHandle(ProcessId pid, ProcessHandle* handle) {
   // On POSIX permissions are checked for each operation on process,
   // not when opening a "handle".
   return OpenProcessHandle(pid, handle);
 }
 void CloseProcessHandle(ProcessHandle process) {
   // See OpenProcessHandle, nothing to do.
   return;
 }
 ProcessId GetProcId(ProcessHandle process) {
   return process;
 }
 // Attempts to kill the process identified by the given process
 // entry structure.  Ignores specified exit_code; posix can't force that.
 // Returns true if this is successful, false otherwise.
 bool KillProcess(ProcessHandle process_id, int exit_code, bool wait) {
   bool result = kill(process_id, SIGTERM) == 0;
   if (result && wait) {
     int tries = 60;
     // The process may not end immediately due to pending I/O
     while (tries-- > 0) {
       int pid = HANDLE_EINTR(waitpid(process_id, NULL, WNOHANG));
       if (pid == process_id)
         break;
       sleep(1);
     }
     result = kill(process_id, SIGKILL) == 0;
   }
   if (!result)
     DLOG(ERROR) << "Unable to terminate process.";
   return result;
 }
 #ifdef ANDROID
 typedef unsigned long int rlim_t;
 #endif
 // A class to handle auto-closing of DIR*'s.
 class ScopedDIRClose {
  public:
   inline void operator()(DIR* x) const {
     if (x) {
       closedir(x);
     }
   }
 };
 typedef scoped_ptr_malloc<DIR, ScopedDIRClose> ScopedDIR;
 void CloseSuperfluousFds(const base::InjectiveMultimap& saved_mapping) {
   // DANGER: no calls to malloc are allowed from now on:
   // http://crbug.com/36678
 #if defined(ANDROID)
   static const rlim_t kSystemDefaultMaxFds = 1024;
   static const char kFDDir[] = "/proc/self/fd";
 #elif defined(OS_LINUX)
   static const rlim_t kSystemDefaultMaxFds = 8192;
   static const char kFDDir[] = "/proc/self/fd";
 #elif defined(OS_MACOSX)
   static const rlim_t kSystemDefaultMaxFds = 256;
   static const char kFDDir[] = "/dev/fd";
 #elif defined(OS_BSD)
   // the getrlimit below should never fail, so whatever ..
   static const rlim_t kSystemDefaultMaxFds = 1024;
   // at least /dev/fd will exist
   static const char kFDDir[] = "/dev/fd";
 #endif
   // Get the maximum number of FDs possible.
   struct rlimit nofile;
   rlim_t max_fds;
   if (getrlimit(RLIMIT_NOFILE, &nofile)) {
     // getrlimit failed. Take a best guess.
     max_fds = kSystemDefaultMaxFds;
     DLOG(ERROR) << "getrlimit(RLIMIT_NOFILE) failed: " << errno;
   } else {
     max_fds = nofile.rlim_cur;
   }
   if (max_fds > INT_MAX)
     max_fds = INT_MAX;
   DirReaderPosix fd_dir(kFDDir);
   if (!fd_dir.IsValid()) {
     // Fallback case: Try every possible fd.
     for (rlim_t i = 0; i < max_fds; ++i) {
       const int fd = static_cast<int>(i);
       if (fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO)
         continue;
       InjectiveMultimap::const_iterator j;
       for (j = saved_mapping.begin(); j != saved_mapping.end(); j++) {
         if (fd == j->dest)
           break;
       }
       if (j != saved_mapping.end())
         continue;
       // Since we're just trying to close anything we can find,
       // ignore any error return values of close().
       HANDLE_EINTR(close(fd));
     }
     return;
   }
   const int dir_fd = fd_dir.fd();
   for ( ; fd_dir.Next(); ) {
     // Skip . and .. entries.
     if (fd_dir.name()[0] == '.')
       continue;
     char *endptr;
     errno = 0;
     const long int fd = strtol(fd_dir.name(), &endptr, 10);
     if (fd_dir.name()[0] == 0 || *endptr || fd < 0 || errno)
       continue;
     if (fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO)
       continue;
     InjectiveMultimap::const_iterator i;
     for (i = saved_mapping.begin(); i != saved_mapping.end(); i++) {
       if (fd == i->dest)
         break;
     }
     if (i != saved_mapping.end())
       continue;
     if (fd == dir_fd)
       continue;
     // When running under Valgrind, Valgrind opens several FDs for its
     // own use and will complain if we try to close them.  All of
     // these FDs are >= |max_fds|, so we can check against that here
     // before closing.  See https://bugs.kde.org/show_bug.cgi?id=191758
     if (fd < static_cast<int>(max_fds)) {
       int ret = HANDLE_EINTR(close(fd));
       if (ret != 0) {
         DLOG(ERROR) << "Problem closing fd";
       }
     }
   }
 }
 // Sets all file descriptors to close on exec except for stdin, stdout
 // and stderr.
 // TODO(agl): Remove this function. It's fundamentally broken for multithreaded
 // apps.
 void SetAllFDsToCloseOnExec() {
 #if defined(OS_LINUX)
   const char fd_dir[] = "/proc/self/fd";
 #elif defined(OS_MACOSX) || defined(OS_BSD)
   const char fd_dir[] = "/dev/fd";
 #endif
   ScopedDIR dir_closer(opendir(fd_dir));
   DIR *dir = dir_closer.get();
   if (NULL == dir) {
     DLOG(ERROR) << "Unable to open " << fd_dir;
     return;
   }
   struct dirent *ent;
   while ((ent = readdir(dir))) {
     // Skip . and .. entries.
     if (ent->d_name[0] == '.')
       continue;
     int i = atoi(ent->d_name);
     // We don't close stdin, stdout or stderr.
     if (i <= STDERR_FILENO)
       continue;
     int flags = fcntl(i, F_GETFD);
     if ((flags == -1) || (fcntl(i, F_SETFD, flags | FD_CLOEXEC) == -1)) {
       DLOG(ERROR) << "fcntl failure.";
     }
   }
 }
 ProcessMetrics::ProcessMetrics(ProcessHandle process) : process_(process),
                                                         last_time_(0),
                                                         last_system_time_(0) {
   processor_count_ = base::SysInfo::NumberOfProcessors();
 }
 // static
 ProcessMetrics* ProcessMetrics::CreateProcessMetrics(ProcessHandle process) {
   return new ProcessMetrics(process);
 }
 ProcessMetrics::~ProcessMetrics() { }
 bool DidProcessCrash(bool* child_exited, ProcessHandle handle) {
   int status;
   const int result = HANDLE_EINTR(waitpid(handle, &status, WNOHANG));
   if (result == -1) {
     // This shouldn't happen, but sometimes it does.  The error is
     // probably ECHILD and the reason is probably that a pid was
     // waited on again after a previous wait reclaimed its zombie.
     // (It could also occur if the process isn't a direct child, but
     // don't do that.)  This is bad, because it risks interfering with
     // an unrelated child process if the pid is reused.
     //
     // So, lacking reliable information, we indicate that the process
     // is dead, in the hope that the caller will give up and stop
     // calling us.  See also bug 943174 and bug 933680.
     CHROMIUM_LOG(ERROR) << "waitpid failed pid:" << handle << " errno:" << errno;
     if (child_exited)
       *child_exited = true;
     return false;
   } else if (result == 0) {
     // the child hasn't exited yet.
     if (child_exited)
       *child_exited = false;
     return false;
   }
   if (child_exited)
     *child_exited = true;
   if (WIFSIGNALED(status)) {
     switch(WTERMSIG(status)) {
       case SIGSYS:
       case SIGSEGV:
       case SIGILL:
       case SIGABRT:
       case SIGFPE:
         return true;
       default:
         return false;
     }
   }
   if (WIFEXITED(status))
     return WEXITSTATUS(status) != 0;
   return false;
 }
 namespace {
 int64_t TimeValToMicroseconds(const struct timeval& tv) {
   return tv.tv_sec * kMicrosecondsPerSecond + tv.tv_usec;
 }
 }
 int ProcessMetrics::GetCPUUsage() {
   struct timeval now;
   struct rusage usage;
   int retval = gettimeofday(&now, NULL);
   if (retval)
     return 0;
   retval = getrusage(RUSAGE_SELF, &usage);
   if (retval)
     return 0;
   int64_t system_time = (TimeValToMicroseconds(usage.ru_stime) +
                        TimeValToMicroseconds(usage.ru_utime)) /
                         processor_count_;
   int64_t time = TimeValToMicroseconds(now);
   if ((last_system_time_ == 0) || (last_time_ == 0)) {
     // First call, just set the last values.
     last_system_time_ = system_time;
     last_time_ = time;
     return 0;
   }
   int64_t system_time_delta = system_time - last_system_time_;
   int64_t time_delta = time - last_time_;
   DCHECK(time_delta != 0);
   if (time_delta == 0)
     return 0;
   // We add time_delta / 2 so the result is rounded.
   int cpu = static_cast<int>((system_time_delta * 100 + time_delta / 2) /
                              time_delta);
   last_system_time_ = system_time;
   last_time_ = time;
   return cpu;
 }
 }  // namespace base

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ipc/chromium/src/base/process_util_posix.cc@6474c204b198 (annotated)

ipc/chromium/src/base/process_util_posix.cc