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//* -*- 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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