1//===-- MonitoringProcessLauncher.cpp ---------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "lldb/Host/MonitoringProcessLauncher.h"
10#include "lldb/Host/FileSystem.h"
11#include "lldb/Host/HostProcess.h"
12#include "lldb/Host/ProcessLaunchInfo.h"
13#include "lldb/Utility/Log.h"
14
15#include "llvm/Support/FileSystem.h"
16
17using namespace lldb;
18using namespace lldb_private;
19
20MonitoringProcessLauncher::MonitoringProcessLauncher(
21    std::unique_ptr<ProcessLauncher> delegate_launcher)
22    : m_delegate_launcher(std::move(delegate_launcher)) {}
23
24HostProcess
25MonitoringProcessLauncher::LaunchProcess(const ProcessLaunchInfo &launch_info,
26                                         Status &error) {
27  ProcessLaunchInfo resolved_info(launch_info);
28
29  error.Clear();
30
31  FileSystem &fs = FileSystem::Instance();
32  FileSpec exe_spec(resolved_info.GetExecutableFile());
33
34  if (!fs.Exists(exe_spec))
35    FileSystem::Instance().Resolve(exe_spec);
36
37  if (!fs.Exists(exe_spec))
38    FileSystem::Instance().ResolveExecutableLocation(exe_spec);
39
40  if (!fs.Exists(exe_spec)) {
41    error.SetErrorStringWithFormatv("executable doesn't exist: '{0}'",
42                                    exe_spec);
43    return HostProcess();
44  }
45
46  resolved_info.SetExecutableFile(exe_spec, false);
47  assert(!resolved_info.GetFlags().Test(eLaunchFlagLaunchInTTY));
48
49  HostProcess process =
50      m_delegate_launcher->LaunchProcess(resolved_info, error);
51
52  if (process.GetProcessId() != LLDB_INVALID_PROCESS_ID) {
53    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
54
55    assert(launch_info.GetMonitorProcessCallback());
56    llvm::Expected<HostThread> maybe_thread =
57        process.StartMonitoring(launch_info.GetMonitorProcessCallback(),
58                                launch_info.GetMonitorSignals());
59    if (!maybe_thread)
60      error.SetErrorStringWithFormatv("failed to launch host thread: {}",
61                                      llvm::toString(maybe_thread.takeError()));
62    if (log)
63      log->PutCString("started monitoring child process.");
64  } else {
65    // Invalid process ID, something didn't go well
66    if (error.Success())
67      error.SetErrorString("process launch failed for unknown reasons");
68  }
69  return process;
70}
71