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/FileSpec.h"
22 #include "lldb/Host/HostThread.h"
23 #include "lldb/lldb-types.h"
25 namespace lldb_private {
29 } // End lldb_private namespace.
34 /// @class ProcessMonitor
35 /// @brief Manages communication with the inferior (debugee) process.
37 /// Upon construction, this class prepares and launches an inferior process for
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[], char const *envp[],
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::Error &error);
59 ProcessMonitor(ProcessFreeBSD *process, lldb::pid_t pid,
60 lldb_private::Error &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
78 /// closed after a call to StopMonitor().
80 /// If this monitor was attached to an existing process this method returns
82 int GetTerminalFD() const { return m_terminal_fd; }
84 /// Reads @p size bytes from address @vm_adder in the inferior process
87 /// This method is provided to implement Process::DoReadMemory.
88 size_t ReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
89 lldb_private::Error &error);
91 /// Writes @p size bytes from address @p vm_adder in the inferior process
94 /// This method is provided to implement Process::DoWriteMemory.
95 size_t WriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size,
96 lldb_private::Error &error);
98 /// Reads the contents from the register identified by the given (architecture
99 /// dependent) offset.
101 /// This method is provided for use by RegisterContextFreeBSD derivatives.
102 bool ReadRegisterValue(lldb::tid_t tid, unsigned offset, const char *reg_name,
103 unsigned size, lldb_private::RegisterValue &value);
105 /// Writes the given value to the register identified by the given
106 /// (architecture dependent) offset.
108 /// This method is provided for use by RegisterContextFreeBSD derivatives.
109 bool WriteRegisterValue(lldb::tid_t tid, unsigned offset,
110 const char *reg_name,
111 const lldb_private::RegisterValue &value);
113 /// Reads the contents from the debug register identified by the given
114 /// (architecture dependent) offset.
116 /// This method is provided for use by RegisterContextFreeBSD derivatives.
117 bool ReadDebugRegisterValue(lldb::tid_t tid, unsigned offset,
118 const char *reg_name, unsigned size,
119 lldb_private::RegisterValue &value);
121 /// Writes the given value to the debug register identified by the given
122 /// (architecture dependent) offset.
124 /// This method is provided for use by RegisterContextFreeBSD derivatives.
125 bool WriteDebugRegisterValue(lldb::tid_t tid, unsigned offset,
126 const char *reg_name,
127 const lldb_private::RegisterValue &value);
128 /// Reads all general purpose registers into the specified buffer.
129 bool ReadGPR(lldb::tid_t tid, void *buf, size_t buf_size);
131 /// Reads all floating point registers into the specified buffer.
132 bool ReadFPR(lldb::tid_t tid, void *buf, size_t buf_size);
134 /// Reads the specified register set into the specified buffer.
136 /// This method is provided for use by RegisterContextFreeBSD derivatives.
137 bool ReadRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size,
138 unsigned int regset);
140 /// Writes all general purpose registers into the specified buffer.
141 bool WriteGPR(lldb::tid_t tid, void *buf, size_t buf_size);
143 /// Writes all floating point registers into the specified buffer.
144 bool WriteFPR(lldb::tid_t tid, void *buf, size_t buf_size);
146 /// Writes the specified register set into the specified buffer.
148 /// This method is provided for use by RegisterContextFreeBSD derivatives.
149 bool WriteRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size,
150 unsigned int regset);
152 /// Reads the value of the thread-specific pointer for a given thread ID.
153 bool ReadThreadPointer(lldb::tid_t tid, lldb::addr_t &value);
155 /// Returns current thread IDs in process
156 size_t GetCurrentThreadIDs(std::vector<lldb::tid_t> &thread_ids);
158 /// Writes a ptrace_lwpinfo structure corresponding to the given thread ID
159 /// to the memory region pointed to by @p lwpinfo.
160 bool GetLwpInfo(lldb::tid_t tid, void *lwpinfo, int &error_no);
162 /// Suspends or unsuspends a thread prior to process resume or step.
163 bool ThreadSuspend(lldb::tid_t tid, bool suspend);
165 /// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
166 /// corresponding to the given thread IDto the memory pointed to by @p
168 bool GetEventMessage(lldb::tid_t tid, unsigned long *message);
170 /// Resumes the process. If @p signo is anything but
171 /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the process.
172 bool Resume(lldb::tid_t unused, uint32_t signo);
174 /// Single steps the process. If @p signo is anything but
175 /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the process.
176 bool SingleStep(lldb::tid_t unused, uint32_t signo);
178 /// Terminate the traced process.
181 lldb_private::Error Detach(lldb::tid_t tid);
185 // Waits for the initial stop message from a new thread.
186 bool WaitForInitialTIDStop(lldb::tid_t tid);
189 ProcessFreeBSD *m_process;
191 lldb_private::HostThread m_operation_thread;
192 lldb_private::HostThread m_monitor_thread;
197 // current operation which must be executed on the privileged thread
198 Operation *m_operation;
199 std::mutex m_operation_mutex;
201 // semaphores notified when Operation is ready to be processed and when
202 // the operation is complete.
203 sem_t m_operation_pending;
204 sem_t m_operation_done;
206 struct OperationArgs {
207 OperationArgs(ProcessMonitor *monitor);
211 ProcessMonitor *m_monitor; // The monitor performing the attach.
212 sem_t m_semaphore; // Posted to once operation complete.
213 lldb_private::Error m_error; // Set if process operation failed.
218 /// @brief Simple structure to pass data to the thread responsible for
219 /// launching a child process.
220 struct LaunchArgs : OperationArgs {
221 LaunchArgs(ProcessMonitor *monitor, lldb_private::Module *module,
222 char const **argv, char const **envp,
223 const lldb_private::FileSpec &stdin_file_spec,
224 const lldb_private::FileSpec &stdout_file_spec,
225 const lldb_private::FileSpec &stderr_file_spec,
226 const lldb_private::FileSpec &working_dir);
230 lldb_private::Module *m_module; // The executable image to launch.
231 char const **m_argv; // Process arguments.
232 char const **m_envp; // Process environment.
233 const lldb_private::FileSpec m_stdin_file_spec; // Redirect stdin or empty.
234 const lldb_private::FileSpec
235 m_stdout_file_spec; // Redirect stdout or empty.
236 const lldb_private::FileSpec
237 m_stderr_file_spec; // Redirect stderr or empty.
238 const lldb_private::FileSpec m_working_dir; // Working directory or empty.
241 void StartLaunchOpThread(LaunchArgs *args, lldb_private::Error &error);
243 static void *LaunchOpThread(void *arg);
245 static bool Launch(LaunchArgs *args);
247 struct AttachArgs : OperationArgs {
248 AttachArgs(ProcessMonitor *monitor, lldb::pid_t pid);
252 lldb::pid_t m_pid; // pid of the process to be attached.
255 void StartAttachOpThread(AttachArgs *args, lldb_private::Error &error);
257 static void *AttachOpThread(void *args);
259 static void Attach(AttachArgs *args);
261 static void ServeOperation(OperationArgs *args);
263 static bool DupDescriptor(const lldb_private::FileSpec &file_spec, int fd,
266 static bool MonitorCallback(ProcessMonitor *monitor, lldb::pid_t pid,
267 bool exited, int signal, int status);
269 static ProcessMessage MonitorSIGTRAP(ProcessMonitor *monitor,
270 const siginfo_t *info, lldb::pid_t pid);
272 static ProcessMessage MonitorSignal(ProcessMonitor *monitor,
273 const siginfo_t *info, lldb::pid_t pid);
275 void DoOperation(Operation *op);
277 /// Stops the child monitor thread.
278 void StopMonitoringChildProcess();
280 /// Stops the operation thread used to attach/launch a process.
284 #endif // #ifndef liblldb_ProcessMonitor_H_