HostProcessPosix.cpp
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//===-- HostProcessPosix.cpp ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/Host.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/posix/HostProcessPosix.h"
#include "llvm/ADT/STLExtras.h"
#include <csignal>
#include <limits.h>
#include <unistd.h>
using namespace lldb_private;
namespace {
const int kInvalidPosixProcess = 0;
}
HostProcessPosix::HostProcessPosix()
: HostNativeProcessBase(kInvalidPosixProcess) {}
HostProcessPosix::HostProcessPosix(lldb::process_t process)
: HostNativeProcessBase(process) {}
HostProcessPosix::~HostProcessPosix() {}
Status HostProcessPosix::Signal(int signo) const {
if (m_process == kInvalidPosixProcess) {
Status error;
error.SetErrorString("HostProcessPosix refers to an invalid process");
return error;
}
return HostProcessPosix::Signal(m_process, signo);
}
Status HostProcessPosix::Signal(lldb::process_t process, int signo) {
Status error;
if (-1 == ::kill(process, signo))
error.SetErrorToErrno();
return error;
}
Status HostProcessPosix::Terminate() { return Signal(SIGKILL); }
Status HostProcessPosix::GetMainModule(FileSpec &file_spec) const {
Status error;
// Use special code here because proc/[pid]/exe is a symbolic link.
char link_path[PATH_MAX];
if (snprintf(link_path, PATH_MAX, "/proc/%" PRIu64 "/exe", m_process) != 1) {
error.SetErrorString("Unable to build /proc/<pid>/exe string");
return error;
}
error = FileSystem::Instance().Readlink(FileSpec(link_path), file_spec);
if (!error.Success())
return error;
// If the binary has been deleted, the link name has " (deleted)" appended.
// Remove if there.
if (file_spec.GetFilename().GetStringRef().endswith(" (deleted)")) {
const char *filename = file_spec.GetFilename().GetCString();
static const size_t deleted_len = strlen(" (deleted)");
const size_t len = file_spec.GetFilename().GetLength();
file_spec.GetFilename().SetCStringWithLength(filename, len - deleted_len);
}
return error;
}
lldb::pid_t HostProcessPosix::GetProcessId() const { return m_process; }
bool HostProcessPosix::IsRunning() const {
if (m_process == kInvalidPosixProcess)
return false;
// Send this process the null signal. If it succeeds the process is running.
Status error = Signal(0);
return error.Success();
}
llvm::Expected<HostThread> HostProcessPosix::StartMonitoring(
const Host::MonitorChildProcessCallback &callback, bool monitor_signals) {
return Host::StartMonitoringChildProcess(callback, m_process,
monitor_signals);
}