contrib/llvm/tools/lldb/source/Host/common/MonitoringProcessLauncher.cpp

   1 //===-- MonitoringProcessLauncher.cpp ---------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "lldb/Host/MonitoringProcessLauncher.h"
  11 #include "lldb/Core/Module.h"
  12 #include "lldb/Core/ModuleSpec.h"
  13 #include "lldb/Host/HostProcess.h"
  14 #include "lldb/Target/Platform.h"
  15 #include "lldb/Target/Process.h"
  16 #include "lldb/Target/ProcessLaunchInfo.h"
  17 #include "lldb/Utility/Log.h"
  18 #include "lldb/Utility/Status.h"
  19
  20 #include "llvm/Support/FileSystem.h"
  21
  22 using namespace lldb;
  23 using namespace lldb_private;
  24
  25 MonitoringProcessLauncher::MonitoringProcessLauncher(
  26     std::unique_ptr<ProcessLauncher> delegate_launcher)
  27     : m_delegate_launcher(std::move(delegate_launcher)) {}
  28
  29 HostProcess
  30 MonitoringProcessLauncher::LaunchProcess(const ProcessLaunchInfo &launch_info,
  31                                          Status &error) {
  32   ProcessLaunchInfo resolved_info(launch_info);
  33
  34   error.Clear();
  35   char exe_path[PATH_MAX];
  36
  37   PlatformSP host_platform_sp(Platform::GetHostPlatform());
  38
  39   const ArchSpec &arch_spec = resolved_info.GetArchitecture();
  40
  41   FileSpec exe_spec(resolved_info.GetExecutableFile());
  42
  43   llvm::sys::fs::file_status stats;
  44   status(exe_spec.GetPath(), stats);
  45   if (!is_regular_file(stats)) {
  46     ModuleSpec module_spec(exe_spec, arch_spec);
  47     lldb::ModuleSP exe_module_sp;
  48     error =
  49         host_platform_sp->ResolveExecutable(module_spec, exe_module_sp, NULL);
  50
  51     if (error.Fail())
  52       return HostProcess();
  53
  54     if (exe_module_sp) {
  55       exe_spec = exe_module_sp->GetFileSpec();
  56       status(exe_spec.GetPath(), stats);
  57     }
  58   }
  59
  60   if (exists(stats)) {
  61     exe_spec.GetPath(exe_path, sizeof(exe_path));
  62   } else {
  63     resolved_info.GetExecutableFile().GetPath(exe_path, sizeof(exe_path));
  64     error.SetErrorStringWithFormat("executable doesn't exist: '%s'", exe_path);
  65     return HostProcess();
  66   }
  67
  68   resolved_info.SetExecutableFile(exe_spec, false);
  69   assert(!resolved_info.GetFlags().Test(eLaunchFlagLaunchInTTY));
  70
  71   HostProcess process =
  72       m_delegate_launcher->LaunchProcess(resolved_info, error);
  73
  74   if (process.GetProcessId() != LLDB_INVALID_PROCESS_ID) {
  75     Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
  76
  77     Host::MonitorChildProcessCallback callback =
  78         launch_info.GetMonitorProcessCallback();
  79
  80     bool monitor_signals = false;
  81     if (callback) {
  82       // If the ProcessLaunchInfo specified a callback, use that.
  83       monitor_signals = launch_info.GetMonitorSignals();
  84     } else {
  85       callback = Process::SetProcessExitStatus;
  86     }
  87
  88     process.StartMonitoring(callback, monitor_signals);
  89     if (log)
  90       log->PutCString("started monitoring child process.");
  91   } else {
  92     // Invalid process ID, something didn't go well
  93     if (error.Success())
  94       error.SetErrorString("process launch failed for unknown reasons");
  95   }
  96   return process;
  97 }