157 lines
5.2 KiB
C++
157 lines
5.2 KiB
C++
// cygload.h -*- C++ -*-
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//
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//
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// Written by Max Kaehn <slothman@electric-cloud.com>
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//
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// This software is a copyrighted work licensed under the terms of the
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// Cygwin license. Please consult the file "CYGWIN_LICENSE" for details.
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//
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// Note that dynamically linking to cygwin1.dll automatically places your code
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// under the GPL unless you purchase a Cygwin Contract with Red Hat, Inc.
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// See http://www.redhat.com/software/cygwin/ for more information.
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// This program has large numbers of progress messages so as to provide
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// maximum information about crash locations for anyone without access to
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// a Microsoft debugger.
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// This file contains the basic infrastructure for connecting an MSVC
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// process to Cygwin.
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#ifndef __CYGLOAD_H__
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#define __CYGLOAD_H__
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#include <windows.h> // for GetProcAddress()
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#include <functional> // for pointer_to_unary_function
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#include <stdexcept> // for runtime_error
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#include <string>
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#include <map>
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#include <vector>
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// Convert GetLastError() to a human-readable STL exception.
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class windows_error : public std::runtime_error
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{
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public:
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windows_error (const char *message, const char *detail = NULL)
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: runtime_error (format (GetLastError (), message, detail)) { }
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windows_error(DWORD error, const char *message, const char *detail = NULL)
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: runtime_error (format (error, message, detail)) { }
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static std::string format (DWORD error, const char *message,
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const char *detail);
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};
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namespace cygwin
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{
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// Cygwin keeps important thread-local information at the top of the
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// stack. Its DllMain-equivalent will do the right thing for any threads
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// you spawn, but you need to declare one of these as the very first thing
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// in your main() function so horrible things won't happen when cygwin
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// overwrites your stack. This will back up the data that will be
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// overwritten and restore it when the destructor is called.
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class padding {
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public:
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padding ();
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~padding ();
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// Verifies that padding has been declared.
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static void check ();
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private:
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std::vector< char > _backup;
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char *_stackbase, *_end;
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// gdb reports sizeof(_cygtls) == 3964 at the time of this writing.
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// This is at the end of the object so it'll be toward the bottom
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// of the stack when it gets declared.
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char _padding[32768];
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static padding *_main;
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static DWORD _mainTID;
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};
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// This hooks your application up to cygwin: it loads cygwin1.dll,
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// initializes it properly, grabs some important symbols, and
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// spawns a thread to let you receive signals from cygwin.
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class connector {
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public:
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connector (const char *dll = "cygwin1.dll");
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~connector ();
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// A wrapper around GetProcAddress() for fetching symbols from the
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// cygwin DLL. Can throw windows_error.
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template < class T > void get_symbol (const char *name, T &fn) const;
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// Wrappers for errno() and strerror().
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int err_no () const;
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std::string str_error (int) const;
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// Converting between the worlds of Windows and Cygwin.
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std::string unix_path (const std::string &windows) const;
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std::string win_path (const std::string &unix) const;
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private:
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HMODULE _library;
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int *(*_errno) ();
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const char *(*_strerror) (int);
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void (*_conv_to_full_posix_path) (const char *, char *);
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void (*_conv_to_full_win32_path) (const char *, char *);
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public:
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// The constructor will automatically hook you up for receiving
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// cygwin signals. Just specify a signal and pass in a signal_handler.
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typedef std::pointer_to_unary_function<int,void> signal_handler;
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signal_handler *set_handler (int signal, signal_handler *);
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private:
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// Cygwin signals can only be received in threads that are calling
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// interruptible functions or otherwise ready to intercept signals, so
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// we spawn a thread that does nothing but call sigwait().
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// This is the entry point:
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static DWORD WINAPI signal_thread (void *);
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// It runs this:
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void await_signal ();
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// And will execute this on receipt of any signal for which it's
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// registered:
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void handle_signals (int);
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HANDLE _signal_thread;
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bool _waiting_for_signals, _signal_thread_done;
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CRITICAL_SECTION _thread_mutex;
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typedef std::map< int, signal_handler * > callback_list;
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callback_list _signal_handlers;
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};
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template <class T> void connector::get_symbol (const char *name,
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T &symbol) const
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{
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FARPROC retval = NULL;
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retval = GetProcAddress (_library, name);
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if (retval == NULL)
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throw windows_error ("GetProcAddress", name);
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symbol = reinterpret_cast < T > (retval);
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}
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// cygwin::error converts errno to a human-readable exception.
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class error : public std::runtime_error
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{
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public:
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error (connector *c, const char *function, const char *detail = NULL)
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: runtime_error (format (c, c->err_no (), function, detail)) { }
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error (connector *c, int err_no, const char *function,
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const char *detail = NULL)
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: runtime_error (format (c, err_no, function, detail)) { }
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static std::string format(connector *c, int err_no,
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const char *message, const char *detail);
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};
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}
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#endif // __CYGLOAD_H__
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