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diff --git a/src/client/solaris/handler/solaris_lwp.h b/src/client/solaris/handler/solaris_lwp.h
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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__
+
+#include <signal.h>
+#include <stdint.h>
+#include <sys/user.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;
+
+ private:
+  // The pid of the process we are listing lwps.
+  int pid_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // CLIENT_SOLARIS_HANDLER_SOLARIS_LWP_H__