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// Copyright 2013 The Chromium Authors
// 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/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "base/process/process_iterator.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) {
DCHECK(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 << ")";
*exit_code = 0;
return TERMINATION_STATUS_NORMAL_TERMINATION;
}
if (result == 0) {
// the child hasn't exited yet.
*exit_code = 0;
return TERMINATION_STATUS_STILL_RUNNING;
}
*exit_code = status;
if (WIFSIGNALED(status)) {
switch (WTERMSIG(status)) {
case SIGABRT:
case SIGBUS:
case SIGFPE:
case SIGILL:
case SIGSEGV:
case SIGTRAP:
case SIGSYS:
return TERMINATION_STATUS_PROCESS_CRASHED;
case SIGKILL:
#if BUILDFLAG(IS_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
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);
}
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(Milliseconds(100));
} while ((end_time - TimeTicks::Now()).is_positive());
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 !BUILDFLAG(IS_APPLE)
namespace {
class BackgroundReaper : public PlatformThread::Delegate {
public:
BackgroundReaper(base::Process child_process, const TimeDelta& wait_time)
: child_process_(std::move(child_process)), wait_time_(wait_time) {}
BackgroundReaper(const BackgroundReaper&) = delete;
BackgroundReaper& operator=(const BackgroundReaper&) = delete;
void ThreadMain() override {
if (!wait_time_.is_zero()) {
child_process_.WaitForExitWithTimeout(wait_time_, nullptr);
kill(child_process_.Handle(), SIGKILL);
}
child_process_.WaitForExit(nullptr);
delete this;
}
private:
Process child_process_;
const TimeDelta wait_time_;
};
} // namespace
void EnsureProcessTerminated(Process process) {
DCHECK(!process.is_current());
if (process.WaitForExitWithTimeout(TimeDelta(), nullptr)) {
return;
}
PlatformThread::CreateNonJoinable(
0, new BackgroundReaper(std::move(process), Seconds(2)));
}
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
void EnsureProcessGetsReaped(Process process) {
DCHECK(!process.is_current());
// If the child is already dead, then there's nothing to do.
if (process.WaitForExitWithTimeout(TimeDelta(), nullptr)) {
return;
}
PlatformThread::CreateNonJoinable(
0, new BackgroundReaper(std::move(process), TimeDelta()));
}
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
#endif // !BUILDFLAG(IS_APPLE)
} // namespace base
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