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// Copyright (c) 2013 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 "base/process/kill.h"
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/posix/eintr_wrapper.h"
#include "base/process/process_iterator.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
namespace base {
namespace {
TerminationStatus GetTerminationStatusImpl(ProcessHandle handle,
bool can_block,
int* exit_code) {
int status = 0;
const pid_t result = HANDLE_EINTR(waitpid(handle, &status,
can_block ? 0 : WNOHANG));
if (result == -1) {
DPLOG(ERROR) << "waitpid(" << handle << ")";
if (exit_code)
*exit_code = 0;
return TERMINATION_STATUS_NORMAL_TERMINATION;
} else if (result == 0) {
// the child hasn't exited yet.
if (exit_code)
*exit_code = 0;
return TERMINATION_STATUS_STILL_RUNNING;
}
if (exit_code)
*exit_code = status;
if (WIFSIGNALED(status)) {
switch (WTERMSIG(status)) {
case SIGABRT:
case SIGBUS:
case SIGFPE:
case SIGILL:
case SIGSEGV:
return TERMINATION_STATUS_PROCESS_CRASHED;
case SIGKILL:
#if defined(OS_CHROMEOS)
// On ChromeOS, only way a process gets kill by SIGKILL
// is by oom-killer.
return TERMINATION_STATUS_PROCESS_WAS_KILLED_BY_OOM;
#endif
case SIGINT:
case SIGTERM:
return TERMINATION_STATUS_PROCESS_WAS_KILLED;
default:
break;
}
}
if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
return TERMINATION_STATUS_ABNORMAL_TERMINATION;
return TERMINATION_STATUS_NORMAL_TERMINATION;
}
} // namespace
#if !defined(OS_NACL_NONSFI)
bool KillProcessGroup(ProcessHandle process_group_id) {
bool result = kill(-1 * process_group_id, SIGKILL) == 0;
if (!result)
DPLOG(ERROR) << "Unable to terminate process group " << process_group_id;
return result;
}
#endif // !defined(OS_NACL_NONSFI)
TerminationStatus GetTerminationStatus(ProcessHandle handle, int* exit_code) {
return GetTerminationStatusImpl(handle, false /* can_block */, exit_code);
}
TerminationStatus GetKnownDeadTerminationStatus(ProcessHandle handle,
int* exit_code) {
bool result = kill(handle, SIGKILL) == 0;
if (!result)
DPLOG(ERROR) << "Unable to terminate process " << handle;
return GetTerminationStatusImpl(handle, true /* can_block */, exit_code);
}
#if !defined(OS_NACL_NONSFI)
bool WaitForProcessesToExit(const FilePath::StringType& executable_name,
TimeDelta wait,
const ProcessFilter* filter) {
bool result = false;
// TODO(port): This is inefficient, but works if there are multiple procs.
// TODO(port): use waitpid to avoid leaving zombies around
TimeTicks end_time = TimeTicks::Now() + wait;
do {
NamedProcessIterator iter(executable_name, filter);
if (!iter.NextProcessEntry()) {
result = true;
break;
}
PlatformThread::Sleep(TimeDelta::FromMilliseconds(100));
} while ((end_time - TimeTicks::Now()) > TimeDelta());
return result;
}
bool CleanupProcesses(const FilePath::StringType& executable_name,
TimeDelta wait,
int exit_code,
const ProcessFilter* filter) {
bool exited_cleanly = WaitForProcessesToExit(executable_name, wait, filter);
if (!exited_cleanly)
KillProcesses(executable_name, exit_code, filter);
return exited_cleanly;
}
#if !defined(OS_MACOSX)
namespace {
// Return true if the given child is dead. This will also reap the process.
// Doesn't block.
static bool IsChildDead(pid_t child) {
const pid_t result = HANDLE_EINTR(waitpid(child, NULL, WNOHANG));
if (result == -1) {
DPLOG(ERROR) << "waitpid(" << child << ")";
NOTREACHED();
} else if (result > 0) {
// The child has died.
return true;
}
return false;
}
// A thread class which waits for the given child to exit and reaps it.
// If the child doesn't exit within a couple of seconds, kill it.
class BackgroundReaper : public PlatformThread::Delegate {
public:
BackgroundReaper(pid_t child, unsigned timeout)
: child_(child),
timeout_(timeout) {
}
// Overridden from PlatformThread::Delegate:
void ThreadMain() override {
WaitForChildToDie();
delete this;
}
void WaitForChildToDie() {
// Wait forever case.
if (timeout_ == 0) {
pid_t r = HANDLE_EINTR(waitpid(child_, NULL, 0));
if (r != child_) {
DPLOG(ERROR) << "While waiting for " << child_
<< " to terminate, we got the following result: " << r;
}
return;
}
// There's no good way to wait for a specific child to exit in a timed
// fashion. (No kqueue on Linux), so we just loop and sleep.
// Wait for 2 * timeout_ 500 milliseconds intervals.
for (unsigned i = 0; i < 2 * timeout_; ++i) {
PlatformThread::Sleep(TimeDelta::FromMilliseconds(500));
if (IsChildDead(child_))
return;
}
if (kill(child_, SIGKILL) == 0) {
// SIGKILL is uncatchable. Since the signal was delivered, we can
// just wait for the process to die now in a blocking manner.
if (HANDLE_EINTR(waitpid(child_, NULL, 0)) < 0)
DPLOG(WARNING) << "waitpid";
} else {
DLOG(ERROR) << "While waiting for " << child_ << " to terminate we"
<< " failed to deliver a SIGKILL signal (" << errno << ").";
}
}
private:
const pid_t child_;
// Number of seconds to wait, if 0 then wait forever and do not attempt to
// kill |child_|.
const unsigned timeout_;
DISALLOW_COPY_AND_ASSIGN(BackgroundReaper);
};
} // namespace
void EnsureProcessTerminated(Process process) {
// If the child is already dead, then there's nothing to do.
if (IsChildDead(process.Pid()))
return;
const unsigned timeout = 2; // seconds
BackgroundReaper* reaper = new BackgroundReaper(process.Pid(), timeout);
PlatformThread::CreateNonJoinable(0, reaper);
}
void EnsureProcessGetsReaped(ProcessId pid) {
// If the child is already dead, then there's nothing to do.
if (IsChildDead(pid))
return;
BackgroundReaper* reaper = new BackgroundReaper(pid, 0);
PlatformThread::CreateNonJoinable(0, reaper);
}
#endif // !defined(OS_MACOSX)
#endif // !defined(OS_NACL_NONSFI)
} // namespace base
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