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 // Copyright (c) 2007, Google Inc.

 // All rights reserved.

 //

 // Redistribution and use in source and binary forms, with or without

 // modification, are permitted provided that the following conditions are

 // met:

 //

 //     * Redistributions of source code must retain the above copyright

 // notice, this list of conditions and the following disclaimer.

 //     * Redistributions in binary form must reproduce the above

 // copyright notice, this list of conditions and the following disclaimer

 // in the documentation and/or other materials provided with the

 // distribution.

 //     * Neither the name of Google Inc. nor the names of its

 // contributors may be used to endorse or promote products derived from

 // this software without specific prior written permission.

 //

 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 // Author: Alfred Peng

 #ifndef CLIENT_SOLARIS_HANDLER_SOLARIS_LWP_H__

 #define CLIENT_SOLARIS_HANDLER_SOLARIS_LWP_H__

 #if defined(sparc) || defined(__sparc)

 #define TARGET_CPU_SPARC 1

 #elif defined(i386) || defined(__i386)

 #define TARGET_CPU_X86 1

 #else

 #error "cannot determine cpu type"

 #endif

 #include <signal.h>

 #include <stdint.h>

 #include <sys/user.h>

 #include <ucontext.h>

 #ifndef _KERNEL

 #define _KERNEL

 #define MUST_UNDEF_KERNEL

 #endif  // _KERNEL

 #include <sys/procfs.h>

 #ifdef MUST_UNDEF_KERNEL

 #undef _KERNEL

 #undef MUST_UNDEF_KERNEL

 #endif  // MUST_UNDEF_KERNEL

 namespace google_breakpad {

 // Max module path name length.

 static const int kMaxModuleNameLength = 256;

 // Holding infomaton about a module in the process.

 struct ModuleInfo {

   char name[kMaxModuleNameLength];

   uintptr_t start_addr;

   int size;

 };

 // A callback to run when getting a lwp in the process.

 // Return true will go on to the next lwp while return false will stop the

 // iteration.

 typedef bool (*LwpCallback)(lwpstatus_t* lsp, void *context); 

 // A callback to run when a new module is found in the process.

 // Return true will go on to the next module while return false will stop the

 // iteration.

 typedef bool (*ModuleCallback)(const ModuleInfo &module_info, void *context);

 // A callback to run when getting a lwpid in the process.

 // Return true will go on to the next lwp while return false will stop the

 // iteration.

 typedef bool (*LwpidCallback)(int lwpid, void *context);

 // Holding the callback information.

 template<class CallbackFunc>

 struct CallbackParam {

   // Callback function address.

   CallbackFunc call_back;

   // Callback context;

   void *context;

   CallbackParam() : call_back(NULL), context(NULL) {

   }

   CallbackParam(CallbackFunc func, void *func_context) :

     call_back(func), context(func_context) {

   }

 };

 ///////////////////////////////////////////////////////////////////////////////

 //

 // SolarisLwp

 //

 // Provides handy support for operation on Solaris lwps.

 // It uses proc file system to get lwp information.

 //

 // TODO(Alfred): Currently it only supports x86. Add SPARC support.

 //

 class SolarisLwp {

  public:

   // Create a SolarisLwp instance to list all the lwps in a process.

   explicit SolarisLwp(int pid);

   ~SolarisLwp();

   int getpid() const { return this->pid_; }

   // Control all the lwps in the process.

   // Return the number of suspended/resumed lwps in the process.

   // Return -1 means failed to control lwps.

   int ControlAllLwps(bool suspend);

   // Get the count of lwps in the process.

   // Return -1 means error.

   int GetLwpCount() const;

   // Iterate the lwps of process.

   // Whenever there is a lwp found, the callback will be invoked to process

   // the information.

   // Return the callback return value or -1 on error.

   int Lwp_iter_all(int pid, CallbackParam<LwpCallback> *callback_param) const;

   // Get the module count of the current process.

   int GetModuleCount() const;

   // Get the mapped modules in the address space.

   // Whenever a module is found, the callback will be invoked to process the

   // information.

   // Return how may modules are found.

   int ListModules(CallbackParam<ModuleCallback> *callback_param) const;

   // Get the bottom of the stack from esp.

   uintptr_t GetLwpStackBottom(uintptr_t current_esp) const;

   // Finds a signal context on the stack given the ebp of our signal handler.

   bool FindSigContext(uintptr_t sighandler_ebp, ucontext_t **sig_ctx);

  private:

   // Check if the address is a valid virtual address.

   bool IsAddressMapped(uintptr_t address) const;

  private:

   // The pid of the process we are listing lwps.

   int pid_;

 };

 }  // namespace google_breakpad

 #endif  // CLIENT_SOLARIS_HANDLER_SOLARIS_LWP_H__