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//===-- ProcessMonitor.h -------------------------------------- -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ProcessMonitor_H_
#define liblldb_ProcessMonitor_H_
// C Includes
#include <semaphore.h>
// C++ Includes
// Other libraries and framework includes
#include "lldb/lldb-types.h"
#include "lldb/Host/Mutex.h"
namespace lldb_private
{
class Error;
class Module;
class Scalar;
} // End lldb_private namespace.
class ProcessLinux;
class Operation;
/// @class ProcessMonitor
/// @brief Manages communication with the inferior (debugee) process.
///
/// Upon construction, this class prepares and launches an inferior process for
/// debugging.
///
/// Changes in the inferior process state are propagated to the associated
/// ProcessLinux instance by calling ProcessLinux::SendMessage with the
/// appropriate ProcessMessage events.
///
/// A purposely minimal set of operations are provided to interrogate and change
/// the inferior process state.
class ProcessMonitor
{
public:
/// Launches an inferior process ready for debugging. Forms the
/// implementation of Process::DoLaunch.
ProcessMonitor(ProcessLinux *process,
lldb_private::Module *module,
char const *argv[],
char const *envp[],
const char *stdin_path,
const char *stdout_path,
const char *stderr_path,
lldb_private::Error &error);
~ProcessMonitor();
/// Provides the process number of debugee.
lldb::pid_t
GetPID() const { return m_pid; }
/// Returns the process associated with this ProcessMonitor.
ProcessLinux &
GetProcess() { return *m_process; }
/// Returns a file descriptor to the controlling terminal of the inferior
/// process.
///
/// Reads from this file descriptor yield both the standard output and
/// standard error of this debugee. Even if stderr and stdout were
/// redirected on launch it may still happen that data is available on this
/// descriptor (if the inferior process opens /dev/tty, for example).
///
/// If this monitor was attached to an existing process this method returns
/// -1.
int
GetTerminalFD() const { return m_terminal_fd; }
/// Reads @p size bytes from address @vm_adder in the inferior process
/// address space.
///
/// This method is provided to implement Process::DoReadMemory.
size_t
ReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
lldb_private::Error &error);
/// Writes @p size bytes from address @p vm_adder in the inferior process
/// address space.
///
/// This method is provided to implement Process::DoWriteMemory.
size_t
WriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size,
lldb_private::Error &error);
/// Reads the contents from the register identified by the given (architecture
/// dependent) offset.
///
/// This method is provided for use by RegisterContextLinux derivatives.
bool
ReadRegisterValue(unsigned offset, lldb_private::Scalar &value);
/// Writes the given value to the register identified by the given
/// (architecture dependent) offset.
///
/// This method is provided for use by RegisterContextLinux derivatives.
bool
WriteRegisterValue(unsigned offset, const lldb_private::Scalar &value);
/// Writes a siginfo_t structure corresponding to the given thread ID to the
/// memory region pointed to by @p siginfo.
bool
GetSignalInfo(lldb::tid_t tid, void *siginfo);
/// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
/// corresponding to the given thread IDto the memory pointed to by @p
/// message.
bool
GetEventMessage(lldb::tid_t tid, unsigned long *message);
/// Resumes the given thread.
bool
Resume(lldb::tid_t tid);
/// Single steps the given thread.
bool
SingleStep(lldb::tid_t tid);
/// Sends the inferior process a PTRACE_KILL signal. The inferior will
/// still exists and can be interrogated. Once resumed it will exit as
/// though it received a SIGKILL.
bool
BringProcessIntoLimbo();
private:
ProcessLinux *m_process;
lldb::thread_t m_operation_thread;
lldb::pid_t m_pid;
int m_terminal_fd;
uint32_t m_monitor_thread;
lldb_private::Mutex m_server_mutex;
int m_client_fd;
int m_server_fd;
/// @class LauchArgs
///
/// @brief Simple structure to pass data to the thread responsible for
/// launching a child process.
struct LaunchArgs
{
LaunchArgs(ProcessMonitor *monitor,
lldb_private::Module *module,
char const **argv,
char const **envp,
const char *stdin_path,
const char *stdout_path,
const char *stderr_path);
~LaunchArgs();
ProcessMonitor *m_monitor; // The monitor performing the launch.
lldb_private::Module *m_module; // The executable image to launch.
char const **m_argv; // Process arguments.
char const **m_envp; // Process environment.
const char *m_stdin_path; // Redirect stdin or NULL.
const char *m_stdout_path; // Redirect stdout or NULL.
const char *m_stderr_path; // Redirect stderr or NULL.
sem_t m_semaphore; // Posted to once launch complete.
lldb_private::Error m_error; // Set if process launch failed.
};
void
StartOperationThread(LaunchArgs *args, lldb_private::Error &error);
void
StopOperationThread();
static void *
OperationThread(void *arg);
static bool
Launch(LaunchArgs *args);
bool
EnableIPC();
static void
ServeOperation(ProcessMonitor *monitor);
static bool
DupDescriptor(const char *path, int fd, int flags);
static bool
MonitorCallback(void *callback_baton,
lldb::pid_t pid, int signal, int status);
static ProcessMessage
MonitorSIGTRAP(ProcessMonitor *monitor, lldb::pid_t pid);
void
DoOperation(Operation *op);
/// Stops the child monitor thread.
void StopMonitoringChildProcess();
};
#endif // #ifndef liblldb_ProcessMonitor_H_
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