1 //===-- ProcessMonitor.h -------------------------------------- -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef liblldb_ProcessMonitor_H_
11 #define liblldb_ProcessMonitor_H_
14 #include <semaphore.h>
20 // Other libraries and framework includes
21 #include "lldb/Host/HostThread.h"
22 #include "lldb/Utility/FileSpec.h"
23 #include "lldb/lldb-types.h"
25 namespace lldb_private {
29 } // End lldb_private namespace.
34 /// @class ProcessMonitor
35 /// Manages communication with the inferior (debugee) process.
37 /// Upon construction, this class prepares and launches an inferior process
40 /// Changes in the inferior process state are propagated to the associated
41 /// ProcessFreeBSD instance by calling ProcessFreeBSD::SendMessage with the
42 /// appropriate ProcessMessage events.
44 /// A purposely minimal set of operations are provided to interrogate and change
45 /// the inferior process state.
46 class ProcessMonitor {
48 /// Launches an inferior process ready for debugging. Forms the
49 /// implementation of Process::DoLaunch.
50 ProcessMonitor(ProcessFreeBSD *process, lldb_private::Module *module,
51 char const *argv[], lldb_private::Environment env,
52 const lldb_private::FileSpec &stdin_file_spec,
53 const lldb_private::FileSpec &stdout_file_spec,
54 const lldb_private::FileSpec &stderr_file_spec,
55 const lldb_private::FileSpec &working_dir,
56 const lldb_private::ProcessLaunchInfo &launch_info,
57 lldb_private::Status &error);
59 ProcessMonitor(ProcessFreeBSD *process, lldb::pid_t pid,
60 lldb_private::Status &error);
64 /// Provides the process number of debugee.
65 lldb::pid_t GetPID() const { return m_pid; }
67 /// Returns the process associated with this ProcessMonitor.
68 ProcessFreeBSD &GetProcess() { return *m_process; }
70 /// Returns a file descriptor to the controlling terminal of the inferior
73 /// Reads from this file descriptor yield both the standard output and
74 /// standard error of this debugee. Even if stderr and stdout were
75 /// redirected on launch it may still happen that data is available on this
76 /// descriptor (if the inferior process opens /dev/tty, for example). This
77 /// descriptor is closed after a call to StopMonitor().
79 /// If this monitor was attached to an existing process this method returns
81 int GetTerminalFD() const { return m_terminal_fd; }
83 /// Reads @p size bytes from address @vm_adder in the inferior process
86 /// This method is provided to implement Process::DoReadMemory.
87 size_t ReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
88 lldb_private::Status &error);
90 /// Writes @p size bytes from address @p vm_adder in the inferior process
93 /// This method is provided to implement Process::DoWriteMemory.
94 size_t WriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size,
95 lldb_private::Status &error);
97 /// Reads the contents from the register identified by the given
98 /// (architecture dependent) offset.
100 /// This method is provided for use by RegisterContextFreeBSD derivatives.
101 bool ReadRegisterValue(lldb::tid_t tid, unsigned offset, const char *reg_name,
102 unsigned size, lldb_private::RegisterValue &value);
104 /// Writes the given value to the register identified by the given
105 /// (architecture dependent) offset.
107 /// This method is provided for use by RegisterContextFreeBSD derivatives.
108 bool WriteRegisterValue(lldb::tid_t tid, unsigned offset,
109 const char *reg_name,
110 const lldb_private::RegisterValue &value);
112 /// Reads the contents from the debug register identified by the given
113 /// (architecture dependent) offset.
115 /// This method is provided for use by RegisterContextFreeBSD derivatives.
116 bool ReadDebugRegisterValue(lldb::tid_t tid, unsigned offset,
117 const char *reg_name, unsigned size,
118 lldb_private::RegisterValue &value);
120 /// Writes the given value to the debug register identified by the given
121 /// (architecture dependent) offset.
123 /// This method is provided for use by RegisterContextFreeBSD derivatives.
124 bool WriteDebugRegisterValue(lldb::tid_t tid, unsigned offset,
125 const char *reg_name,
126 const lldb_private::RegisterValue &value);
127 /// Reads all general purpose registers into the specified buffer.
128 bool ReadGPR(lldb::tid_t tid, void *buf, size_t buf_size);
130 /// Reads all floating point registers into the specified buffer.
131 bool ReadFPR(lldb::tid_t tid, void *buf, size_t buf_size);
133 /// Reads the specified register set into the specified buffer.
135 /// This method is provided for use by RegisterContextFreeBSD derivatives.
136 bool ReadRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size,
137 unsigned int regset);
139 /// Writes all general purpose registers into the specified buffer.
140 bool WriteGPR(lldb::tid_t tid, void *buf, size_t buf_size);
142 /// Writes all floating point registers into the specified buffer.
143 bool WriteFPR(lldb::tid_t tid, void *buf, size_t buf_size);
145 /// Writes the specified register set into the specified buffer.
147 /// This method is provided for use by RegisterContextFreeBSD derivatives.
148 bool WriteRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size,
149 unsigned int regset);
151 /// Reads the value of the thread-specific pointer for a given thread ID.
152 bool ReadThreadPointer(lldb::tid_t tid, lldb::addr_t &value);
154 /// Returns current thread IDs in process
155 size_t GetCurrentThreadIDs(std::vector<lldb::tid_t> &thread_ids);
157 /// Writes a ptrace_lwpinfo structure corresponding to the given thread ID
158 /// to the memory region pointed to by @p lwpinfo.
159 bool GetLwpInfo(lldb::tid_t tid, void *lwpinfo, int &error_no);
161 /// Suspends or unsuspends a thread prior to process resume or step.
162 bool ThreadSuspend(lldb::tid_t tid, bool suspend);
164 /// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
165 /// corresponding to the given thread IDto the memory pointed to by @p
167 bool GetEventMessage(lldb::tid_t tid, unsigned long *message);
169 /// Resumes the process. If @p signo is anything but
170 /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the process.
171 bool Resume(lldb::tid_t unused, uint32_t signo);
173 /// Single steps the process. If @p signo is anything but
174 /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the process.
175 bool SingleStep(lldb::tid_t unused, uint32_t signo);
177 /// Terminate the traced process.
180 lldb_private::Status Detach(lldb::tid_t tid);
184 // Waits for the initial stop message from a new thread.
185 bool WaitForInitialTIDStop(lldb::tid_t tid);
188 ProcessFreeBSD *m_process;
190 lldb_private::HostThread m_operation_thread;
191 lldb_private::HostThread m_monitor_thread;
196 // current operation which must be executed on the privileged thread
197 Operation *m_operation;
198 std::mutex m_operation_mutex;
200 // semaphores notified when Operation is ready to be processed and when
201 // the operation is complete.
202 sem_t m_operation_pending;
203 sem_t m_operation_done;
205 struct OperationArgs {
206 OperationArgs(ProcessMonitor *monitor);
210 ProcessMonitor *m_monitor; // The monitor performing the attach.
211 sem_t m_semaphore; // Posted to once operation complete.
212 lldb_private::Status m_error; // Set if process operation failed.
217 /// Simple structure to pass data to the thread responsible for launching a
219 struct LaunchArgs : OperationArgs {
220 LaunchArgs(ProcessMonitor *monitor, lldb_private::Module *module,
221 char const **argv, lldb_private::Environment env,
222 const lldb_private::FileSpec &stdin_file_spec,
223 const lldb_private::FileSpec &stdout_file_spec,
224 const lldb_private::FileSpec &stderr_file_spec,
225 const lldb_private::FileSpec &working_dir);
229 lldb_private::Module *m_module; // The executable image to launch.
230 char const **m_argv; // Process arguments.
231 lldb_private::Environment m_env; // Process environment.
232 const lldb_private::FileSpec m_stdin_file_spec; // Redirect stdin or empty.
233 const lldb_private::FileSpec
234 m_stdout_file_spec; // Redirect stdout or empty.
235 const lldb_private::FileSpec
236 m_stderr_file_spec; // Redirect stderr or empty.
237 const lldb_private::FileSpec m_working_dir; // Working directory or empty.
240 void StartLaunchOpThread(LaunchArgs *args, lldb_private::Status &error);
242 static void *LaunchOpThread(void *arg);
244 static bool Launch(LaunchArgs *args);
246 struct AttachArgs : OperationArgs {
247 AttachArgs(ProcessMonitor *monitor, lldb::pid_t pid);
251 lldb::pid_t m_pid; // pid of the process to be attached.
254 void StartAttachOpThread(AttachArgs *args, lldb_private::Status &error);
256 static void *AttachOpThread(void *args);
258 static void Attach(AttachArgs *args);
260 static void ServeOperation(OperationArgs *args);
262 static bool DupDescriptor(const lldb_private::FileSpec &file_spec, int fd,
265 static bool MonitorCallback(ProcessMonitor *monitor, lldb::pid_t pid,
266 bool exited, int signal, int status);
268 static ProcessMessage MonitorSIGTRAP(ProcessMonitor *monitor,
269 const siginfo_t *info, lldb::pid_t pid);
271 static ProcessMessage MonitorSignal(ProcessMonitor *monitor,
272 const siginfo_t *info, lldb::pid_t pid);
274 void DoOperation(Operation *op);
276 /// Stops the child monitor thread.
277 void StopMonitoringChildProcess();
279 /// Stops the operation thread used to attach/launch a process.
283 #endif // #ifndef liblldb_ProcessMonitor_H_