luc14n0/glib
1
0
Fork 0
mirror of https://gitlab.gnome.org/GNOME/glib.git synced 2024-12-27 07:56:14 +01:00
Code Issues Packages Projects Releases Wiki Activity
6f55306e04
glib/glib/gwin32.c
Andrea Azzarone 7bc21392e1 gwin32: Fix comment for g_win32_veh_handler
2019-03-07 10:38:24 +00:00

1235 lines
38 KiB
C
Raw Blame History

/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1998 Peter Mattis, Spencer Kimball and Josh MacDonald
* Copyright (C) 1998-1999 Tor Lillqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe for the unix part, FIXME: make the win32 part MT safe as well.
*/
#include "config.h"
#include "glibconfig.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#include <errno.h>
#include <fcntl.h>
#define STRICT /* Strict typing, please */
#include <windows.h>
#undef STRICT
#ifndef G_WITH_CYGWIN
#include <direct.h>
#endif
#include <errno.h>
#include <ctype.h>
#if defined(_MSC_VER) || defined(__DMC__)
# include <io.h>
#endif /* _MSC_VER || __DMC__ */
#define MODERN_API_FAMILY 2
#if WINAPI_FAMILY == MODERN_API_FAMILY
/* This is for modern UI Builds, where we can't use LoadLibraryW()/GetProcAddress() */
/* ntddk.h is found in the WDK, and MinGW */
#include <ntddk.h>
#ifdef _MSC_VER
#pragma comment (lib, "ntoskrnl.lib")
#endif
#elif defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
/* mingw-w64 must use winternl.h, but not MinGW */
#include <ntdef.h>
#else
#include <winternl.h>
#endif
#include "glib.h"
#include "gthreadprivate.h"
#include "glib-init.h"
#ifdef G_WITH_CYGWIN
#include <sys/cygwin.h>
#endif
#ifndef G_WITH_CYGWIN
gint
g_win32_ftruncate (gint fd,
guint size)
{
return _chsize (fd, size);
}
#endif
/**
* g_win32_getlocale:
*
* The setlocale() function in the Microsoft C library uses locale
* names of the form "English_United States.1252" etc. We want the
* UNIXish standard form "en_US", "zh_TW" etc. This function gets the
* current thread locale from Windows - without any encoding info -
* and returns it as a string of the above form for use in forming
* file names etc. The returned string should be deallocated with
* g_free().
*
* Returns: newly-allocated locale name.
**/
#ifndef SUBLANG_SERBIAN_LATIN_BA
#define SUBLANG_SERBIAN_LATIN_BA 0x06
#endif
gchar *
g_win32_getlocale (void)
{
LCID lcid;
LANGID langid;
gchar *ev;
gint primary, sub;
char iso639[10];
char iso3166[10];
const gchar *script = NULL;
/* Let the user override the system settings through environment
* variables, as on POSIX systems. Note that in GTK+ applications
* since GTK+ 2.10.7 setting either LC_ALL or LANG also sets the
* Win32 locale and C library locale through code in gtkmain.c.
*/
if (((ev = getenv ("LC_ALL")) != NULL && ev[0] != '\0')
|| ((ev = getenv ("LC_MESSAGES")) != NULL && ev[0] != '\0')
|| ((ev = getenv ("LANG")) != NULL && ev[0] != '\0'))
return g_strdup (ev);
lcid = GetThreadLocale ();
if (!GetLocaleInfo (lcid, LOCALE_SISO639LANGNAME, iso639, sizeof (iso639)) ||
!GetLocaleInfo (lcid, LOCALE_SISO3166CTRYNAME, iso3166, sizeof (iso3166)))
return g_strdup ("C");
/* Strip off the sorting rules, keep only the language part. */
langid = LANGIDFROMLCID (lcid);
/* Split into language and territory part. */
primary = PRIMARYLANGID (langid);
sub = SUBLANGID (langid);
/* Handle special cases */
switch (primary)
{
case LANG_AZERI:
switch (sub)
{
case SUBLANG_AZERI_LATIN:
script = "@Latn";
break;
case SUBLANG_AZERI_CYRILLIC:
script = "@Cyrl";
break;
}
break;
case LANG_SERBIAN: /* LANG_CROATIAN == LANG_SERBIAN */
switch (sub)
{
case SUBLANG_SERBIAN_LATIN:
case 0x06: /* Serbian (Latin) - Bosnia and Herzegovina */
script = "@Latn";
break;
}
break;
case LANG_UZBEK:
switch (sub)
{
case SUBLANG_UZBEK_LATIN:
script = "@Latn";
break;
case SUBLANG_UZBEK_CYRILLIC:
script = "@Cyrl";
break;
}
break;
}
return g_strconcat (iso639, "_", iso3166, script, NULL);
}
/**
* g_win32_error_message:
* @error: error code.
*
* Translate a Win32 error code (as returned by GetLastError() or
* WSAGetLastError()) into the corresponding message. The message is
* either language neutral, or in the thread's language, or the user's
* language, the system's language, or US English (see docs for
* FormatMessage()). The returned string is in UTF-8. It should be
* deallocated with g_free().
*
* Returns: newly-allocated error message
**/
gchar *
g_win32_error_message (gint error)
{
gchar *retval;
wchar_t *msg = NULL;
size_t nchars;
FormatMessageW (FORMAT_MESSAGE_ALLOCATE_BUFFER
|FORMAT_MESSAGE_IGNORE_INSERTS
|FORMAT_MESSAGE_FROM_SYSTEM,
NULL, error, 0,
(LPWSTR) &msg, 0, NULL);
if (msg != NULL)
{
nchars = wcslen (msg);
if (nchars >= 2 && msg[nchars-1] == L'\n' && msg[nchars-2] == L'\r')
msg[nchars-2] = L'\0';
retval = g_utf16_to_utf8 (msg, -1, NULL, NULL, NULL);
LocalFree (msg);
}
else
retval = g_strdup ("");
return retval;
}
/**
* g_win32_get_package_installation_directory_of_module:
* @hmodule: (nullable): The Win32 handle for a DLL loaded into the current process, or %NULL
*
* This function tries to determine the installation directory of a
* software package based on the location of a DLL of the software
* package.
*
* @hmodule should be the handle of a loaded DLL or %NULL. The
* function looks up the directory that DLL was loaded from. If
* @hmodule is NULL, the directory the main executable of the current
* process is looked up. If that directory's last component is "bin"
* or "lib", its parent directory is returned, otherwise the directory
* itself.
*
* It thus makes sense to pass only the handle to a "public" DLL of a
* software package to this function, as such DLLs typically are known
* to be installed in a "bin" or occasionally "lib" subfolder of the
* installation folder. DLLs that are of the dynamically loaded module
* or plugin variety are often located in more private locations
* deeper down in the tree, from which it is impossible for GLib to
* deduce the root of the package installation.
*
* The typical use case for this function is to have a DllMain() that
* saves the handle for the DLL. Then when code in the DLL needs to
* construct names of files in the installation tree it calls this
* function passing the DLL handle.
*
* Returns: a string containing the guessed installation directory for
* the software package @hmodule is from. The string is in the GLib
* file name encoding, i.e. UTF-8. The return value should be freed
* with g_free() when not needed any longer. If the function fails
* %NULL is returned.
*
* Since: 2.16
*/
gchar *
g_win32_get_package_installation_directory_of_module (gpointer hmodule)
{
gchar *filename;
gchar *retval;
gchar *p;
wchar_t wc_fn[MAX_PATH];
/* NOTE: it relies that GetModuleFileNameW returns only canonical paths */
if (!GetModuleFileNameW (hmodule, wc_fn, MAX_PATH))
return NULL;
filename = g_utf16_to_utf8 (wc_fn, -1, NULL, NULL, NULL);
if ((p = strrchr (filename, G_DIR_SEPARATOR)) != NULL)
*p = '\0';
retval = g_strdup (filename);
do
{
p = strrchr (retval, G_DIR_SEPARATOR);
if (p == NULL)
break;
*p = '\0';
if (g_ascii_strcasecmp (p + 1, "bin") == 0 ||
g_ascii_strcasecmp (p + 1, "lib") == 0)
break;
}
while (p != NULL);
if (p == NULL)
{
g_free (retval);
retval = filename;
}
else
g_free (filename);
#ifdef G_WITH_CYGWIN
/* In Cygwin we need to have POSIX paths */
{
gchar tmp[MAX_PATH];
cygwin_conv_to_posix_path (retval, tmp);
g_free (retval);
retval = g_strdup (tmp);
}
#endif
return retval;
}
static gchar *
get_package_directory_from_module (const gchar *module_name)
{
static GHashTable *module_dirs = NULL;
G_LOCK_DEFINE_STATIC (module_dirs);
HMODULE hmodule = NULL;
gchar *fn;
G_LOCK (module_dirs);
if (module_dirs == NULL)
module_dirs = g_hash_table_new (g_str_hash, g_str_equal);
fn = g_hash_table_lookup (module_dirs, module_name ? module_name : "");
if (fn)
{
G_UNLOCK (module_dirs);
return g_strdup (fn);
}
if (module_name)
{
wchar_t *wc_module_name = g_utf8_to_utf16 (module_name, -1, NULL, NULL, NULL);
hmodule = GetModuleHandleW (wc_module_name);
g_free (wc_module_name);
if (!hmodule)
{
G_UNLOCK (module_dirs);
return NULL;
}
}
fn = g_win32_get_package_installation_directory_of_module (hmodule);
if (fn == NULL)
{
G_UNLOCK (module_dirs);
return NULL;
}
g_hash_table_insert (module_dirs, module_name ? g_strdup (module_name) : "", fn);
G_UNLOCK (module_dirs);
return g_strdup (fn);
}
/**
* g_win32_get_package_installation_directory:
* @package: (nullable): You should pass %NULL for this.
* @dll_name: (nullable): The name of a DLL that a package provides in UTF-8, or %NULL.
*
* Try to determine the installation directory for a software package.
*
* This function is deprecated. Use
* g_win32_get_package_installation_directory_of_module() instead.
*
* The use of @package is deprecated. You should always pass %NULL. A
* warning is printed if non-NULL is passed as @package.
*
* The original intended use of @package was for a short identifier of
* the package, typically the same identifier as used for
* `GETTEXT_PACKAGE` in software configured using GNU
* autotools. The function first looks in the Windows Registry for the
* value `#InstallationDirectory` in the key
* `#HKLM\Software\@package`, and if that value
* exists and is a string, returns that.
*
* It is strongly recommended that packagers of GLib-using libraries
* for Windows do not store installation paths in the Registry to be
* used by this function as that interfers with having several
* parallel installations of the library. Enabling multiple
* installations of different versions of some GLib-using library, or
* GLib itself, is desirable for various reasons.
*
* For this reason it is recommeded to always pass %NULL as
* @package to this function, to avoid the temptation to use the
* Registry. In version 2.20 of GLib the @package parameter
* will be ignored and this function won't look in the Registry at all.
*
* If @package is %NULL, or the above value isn't found in the
* Registry, but @dll_name is non-%NULL, it should name a DLL loaded
* into the current process. Typically that would be the name of the
* DLL calling this function, looking for its installation
* directory. The function then asks Windows what directory that DLL
* was loaded from. If that directory's last component is "bin" or
* "lib", the parent directory is returned, otherwise the directory
* itself. If that DLL isn't loaded, the function proceeds as if
* @dll_name was %NULL.
*
* If both @package and @dll_name are %NULL, the directory from where
* the main executable of the process was loaded is used instead in
* the same way as above.
*
* Returns: a string containing the installation directory for
* @package. The string is in the GLib file name encoding,
* i.e. UTF-8. The return value should be freed with g_free() when not
* needed any longer. If the function fails %NULL is returned.
*
* Deprecated: 2.18: Pass the HMODULE of a DLL or EXE to
* g_win32_get_package_installation_directory_of_module() instead.
**/
gchar *
g_win32_get_package_installation_directory (const gchar *package,
const gchar *dll_name)
{
gchar *result = NULL;
if (package != NULL)
g_warning ("Passing a non-NULL package to g_win32_get_package_installation_directory() is deprecated and it is ignored.");
if (dll_name != NULL)
result = get_package_directory_from_module (dll_name);
if (result == NULL)
result = get_package_directory_from_module (NULL);
return result;
}
/**
* g_win32_get_package_installation_subdirectory:
* @package: (nullable): You should pass %NULL for this.
* @dll_name: (nullable): The name of a DLL that a package provides, in UTF-8, or %NULL.
* @subdir: A subdirectory of the package installation directory, also in UTF-8
*
* This function is deprecated. Use
* g_win32_get_package_installation_directory_of_module() and
* g_build_filename() instead.
*
* Returns a newly-allocated string containing the path of the
* subdirectory @subdir in the return value from calling
* g_win32_get_package_installation_directory() with the @package and
* @dll_name parameters. See the documentation for
* g_win32_get_package_installation_directory() for more details. In
* particular, note that it is deprecated to pass anything except NULL
* as @package.
*
* Returns: a string containing the complete path to @subdir inside
* the installation directory of @package. The returned string is in
* the GLib file name encoding, i.e. UTF-8. The return value should be
* freed with g_free() when no longer needed. If something goes wrong,
* %NULL is returned.
*
* Deprecated: 2.18: Pass the HMODULE of a DLL or EXE to
* g_win32_get_package_installation_directory_of_module() instead, and
* then construct a subdirectory pathname with g_build_filename().
**/
gchar *
g_win32_get_package_installation_subdirectory (const gchar *package,
const gchar *dll_name,
const gchar *subdir)
{
gchar *prefix;
gchar *dirname;
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
prefix = g_win32_get_package_installation_directory (package, dll_name);
G_GNUC_END_IGNORE_DEPRECATIONS
dirname = g_build_filename (prefix, subdir, NULL);
g_free (prefix);
return dirname;
}
/**
* g_win32_check_windows_version:
* @major: major version of Windows
* @minor: minor version of Windows
* @spver: Windows Service Pack Level, 0 if none
* @os_type: Type of Windows OS
*
* Returns whether the version of the Windows operating system the
* code is running on is at least the specified major, minor and
* service pack versions. See MSDN documentation for the Operating
* System Version. Software that needs even more detailed version and
* feature information should use the Win32 API VerifyVersionInfo()
* directly.
*
* Successive calls of this function can be used for enabling or
* disabling features at run-time for a range of Windows versions,
* as per the VerifyVersionInfo() API documentation.
*
* Returns: %TRUE if the Windows Version is the same or greater than
* the specified major, minor and service pack versions, and
* whether the running Windows is a workstation or server edition
* of Windows, if specifically specified.
*
* Since: 2.44
**/
gboolean
g_win32_check_windows_version (const gint major,
const gint minor,
const gint spver,
const GWin32OSType os_type)
{
OSVERSIONINFOEXW osverinfo;
gboolean is_ver_checked = FALSE;
gboolean is_type_checked = FALSE;
#if WINAPI_FAMILY != MODERN_API_FAMILY
/* For non-modern UI Apps, use the LoadLibraryW()/GetProcAddress() thing */
typedef NTSTATUS (WINAPI fRtlGetVersion) (PRTL_OSVERSIONINFOEXW);
fRtlGetVersion *RtlGetVersion;
HMODULE hmodule;
#endif
/* We Only Support Checking for XP or later */
g_return_val_if_fail (major >= 5 && (major <=6 || major == 10), FALSE);
g_return_val_if_fail ((major >= 5 && minor >= 1) || major >= 6, FALSE);
/* Check for Service Pack Version >= 0 */
g_return_val_if_fail (spver >= 0, FALSE);
#if WINAPI_FAMILY != MODERN_API_FAMILY
hmodule = LoadLibraryW (L"ntdll.dll");
g_return_val_if_fail (hmodule != NULL, FALSE);
RtlGetVersion = (fRtlGetVersion *) GetProcAddress (hmodule, "RtlGetVersion");
g_return_val_if_fail (RtlGetVersion != NULL, FALSE);
#endif
memset (&osverinfo, 0, sizeof (OSVERSIONINFOEXW));
osverinfo.dwOSVersionInfoSize = sizeof (OSVERSIONINFOEXW);
RtlGetVersion (&osverinfo);
/* check the OS and Service Pack Versions */
if (osverinfo.dwMajorVersion > major)
is_ver_checked = TRUE;
else if (osverinfo.dwMajorVersion == major)
{
if (osverinfo.dwMinorVersion > minor)
is_ver_checked = TRUE;
else if (osverinfo.dwMinorVersion == minor)
if (osverinfo.wServicePackMajor >= spver)
is_ver_checked = TRUE;
}
/* Check OS Type */
if (is_ver_checked)
{
switch (os_type)
{
case G_WIN32_OS_ANY:
is_type_checked = TRUE;
break;
case G_WIN32_OS_WORKSTATION:
if (osverinfo.wProductType == VER_NT_WORKSTATION)
is_type_checked = TRUE;
break;
case G_WIN32_OS_SERVER:
if (osverinfo.wProductType == VER_NT_SERVER ||
osverinfo.wProductType == VER_NT_DOMAIN_CONTROLLER)
is_type_checked = TRUE;
break;
default:
/* shouldn't get here normally */
g_warning ("Invalid os_type specified");
break;
}
}
#if WINAPI_FAMILY != MODERN_API_FAMILY
FreeLibrary (hmodule);
#endif
return is_ver_checked && is_type_checked;
}
/**
* g_win32_get_windows_version:
*
* This function is deprecated. Use
* g_win32_check_windows_version() instead.
*
* Returns version information for the Windows operating system the
* code is running on. See MSDN documentation for the GetVersion()
* function. To summarize, the most significant bit is one on Win9x,
* and zero on NT-based systems. Since version 2.14, GLib works only
* on NT-based systems, so checking whether your are running on Win9x
* in your own software is moot. The least significant byte is 4 on
* Windows NT 4, and 5 on Windows XP. Software that needs really
* detailed version and feature information should use Win32 API like
* GetVersionEx() and VerifyVersionInfo().
*
* Returns: The version information.
*
* Deprecated: 2.44: Be aware that for Windows 8.1 and Windows Server
* 2012 R2 and later, this will return 62 unless the application is
* manifested for Windows 8.1/Windows Server 2012 R2, for example.
* MSDN stated that GetVersion(), which is used here, is subject to
* further change or removal after Windows 8.1.
**/
guint
g_win32_get_windows_version (void)
{
static gsize windows_version;
if (g_once_init_enter (&windows_version))
g_once_init_leave (&windows_version, GetVersion ());
return windows_version;
}
/*
* Doesn't use gettext (and gconv), preventing recursive calls when
* g_win32_locale_filename_from_utf8() is called during
* gettext initialization.
*/
static gchar *
special_wchar_to_locale_enoding (wchar_t *wstring)
{
int sizeof_output;
int wctmb_result;
char *result;
BOOL not_representable = FALSE;
sizeof_output = WideCharToMultiByte (CP_ACP,
WC_NO_BEST_FIT_CHARS,
wstring, -1,
NULL, 0,
NULL,
&not_representable);
if (not_representable ||
sizeof_output == 0 ||
sizeof_output > MAX_PATH)
return NULL;
result = g_malloc0 (sizeof_output + 1);
wctmb_result = WideCharToMultiByte (CP_ACP,
WC_NO_BEST_FIT_CHARS,
wstring, -1,
result, sizeof_output + 1,
NULL,
&not_representable);
if (wctmb_result == sizeof_output &&
not_representable == FALSE)
return result;
g_free (result);
return NULL;
}
/**
* g_win32_locale_filename_from_utf8:
* @utf8filename: a UTF-8 encoded filename.
*
* Converts a filename from UTF-8 to the system codepage.
*
* On NT-based Windows, on NTFS file systems, file names are in
* Unicode. It is quite possible that Unicode file names contain
* characters not representable in the system codepage. (For instance,
* Greek or Cyrillic characters on Western European or US Windows
* installations, or various less common CJK characters on CJK Windows
* installations.)
*
* In such a case, and if the filename refers to an existing file, and
* the file system stores alternate short (8.3) names for directory
* entries, the short form of the filename is returned. Note that the
* "short" name might in fact be longer than the Unicode name if the
* Unicode name has very short pathname components containing
* non-ASCII characters. If no system codepage name for the file is
* possible, %NULL is returned.
*
* The return value is dynamically allocated and should be freed with
* g_free() when no longer needed.
*
* Returns: The converted filename, or %NULL on conversion
* failure and lack of short names.
*
* Since: 2.8
*/
gchar *
g_win32_locale_filename_from_utf8 (const gchar *utf8filename)
{
gchar *retval;
wchar_t *wname;
wname = g_utf8_to_utf16 (utf8filename, -1, NULL, NULL, NULL);
if (wname == NULL)
return NULL;
retval = special_wchar_to_locale_enoding (wname);
if (retval == NULL)
{
/* Conversion failed, so check if there is a 8.3 version, and use that. */
wchar_t wshortname[MAX_PATH + 1];
if (GetShortPathNameW (wname, wshortname, G_N_ELEMENTS (wshortname)))
retval = special_wchar_to_locale_enoding (wshortname);
}
g_free (wname);
return retval;
}
/**
* g_win32_get_command_line:
*
* Gets the command line arguments, on Windows, in the GLib filename
* encoding (ie: UTF-8).
*
* Normally, on Windows, the command line arguments are passed to main()
* in the system codepage encoding. This prevents passing filenames as
* arguments if the filenames contain characters that fall outside of
* this codepage. If such filenames are passed, then substitutions
* will occur (such as replacing some characters with '?').
*
* GLib's policy of using UTF-8 as a filename encoding on Windows was
* designed to localise the pain of dealing with filenames outside of
* the system codepage to one area: dealing with commandline arguments
* in main().
*
* As such, most GLib programs should ignore the value of argv passed to
* their main() function and call g_win32_get_command_line() instead.
* This will get the "full Unicode" commandline arguments using
* GetCommandLineW() and convert it to the GLib filename encoding (which
* is UTF-8 on Windows).
*
* The strings returned by this function are suitable for use with
* functions such as g_open() and g_file_new_for_commandline_arg() but
* are not suitable for use with g_option_context_parse(), which assumes
* that its input will be in the system codepage. The return value is
* suitable for use with g_option_context_parse_strv(), however, which
* is a better match anyway because it won't leak memory.
*
* Unlike argv, the returned value is a normal strv and can (and should)
* be freed with g_strfreev() when no longer needed.
*
* Returns: (transfer full): the commandline arguments in the GLib
* filename encoding (ie: UTF-8)
*
* Since: 2.40
**/
gchar **
g_win32_get_command_line (void)
{
gchar **result;
LPWSTR *args;
gint i, n;
args = CommandLineToArgvW (GetCommandLineW(), &n);
result = g_new (gchar *, n + 1);
for (i = 0; i < n; i++)
result[i] = g_utf16_to_utf8 (args[i], -1, NULL, NULL, NULL);
result[i] = NULL;
LocalFree (args);
return result;
}
#ifdef G_OS_WIN32
/* Binary compatibility versions. Not for newly compiled code. */
_GLIB_EXTERN gchar *g_win32_get_package_installation_directory_utf8 (const gchar *package,
const gchar *dll_name);
_GLIB_EXTERN gchar *g_win32_get_package_installation_subdirectory_utf8 (const gchar *package,
const gchar *dll_name,
const gchar *subdir);
gchar *
g_win32_get_package_installation_directory_utf8 (const gchar *package,
const gchar *dll_name)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
return g_win32_get_package_installation_directory (package, dll_name);
G_GNUC_END_IGNORE_DEPRECATIONS
}
gchar *
g_win32_get_package_installation_subdirectory_utf8 (const gchar *package,
const gchar *dll_name,
const gchar *subdir)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
return g_win32_get_package_installation_subdirectory (package,
dll_name,
subdir);
G_GNUC_END_IGNORE_DEPRECATIONS
}
#endif
#ifdef G_OS_WIN32
/* This function looks up two environment
* variables, G_WIN32_ALLOC_CONSOLE and G_WIN32_ATTACH_CONSOLE.
* G_WIN32_ALLOC_CONSOLE, if set to 1, makes the process
* call AllocConsole(). This is useful for binaries that
* are compiled to run without automatically-allocated console
* (like most GUI applications).
* G_WIN32_ATTACH_CONSOLE, if set to a comma-separated list
* of one or more strings "stdout", "stdin" and "stderr",
* makes the process reopen the corresponding standard streams
* to ensure that they are attached to the files that
* GetStdHandle() returns, which, hopefully, would be
* either a file handle or a console handle.
*
* This function is called automatically when glib DLL is
* attached to a process, from DllMain().
*/
void
g_console_win32_init (void)
{
struct
{
gboolean redirect;
FILE *stream;
const gchar *stream_name;
DWORD std_handle_type;
int flags;
const gchar *mode;
}
streams[] =
{
{ FALSE, stdin, "stdin", STD_INPUT_HANDLE, _O_RDONLY, "rb" },
{ FALSE, stdout, "stdout", STD_OUTPUT_HANDLE, 0, "wb" },
{ FALSE, stderr, "stderr", STD_ERROR_HANDLE, 0, "wb" },
};
const gchar *attach_envvar;
guint i;
gchar **attach_strs;
/* Note: it's not a very good practice to use DllMain()
* to call any functions not in Kernel32.dll.
* The following only works if there are no weird
* circular DLL dependencies that could cause glib DllMain()
* to be called before CRT DllMain().
*/
if (g_strcmp0 (g_getenv ("G_WIN32_ALLOC_CONSOLE"), "1") == 0)
AllocConsole (); /* no error handling, fails if console already exists */
attach_envvar = g_getenv ("G_WIN32_ATTACH_CONSOLE");
if (attach_envvar == NULL)
return;
/* Re-use parent console, if we don't have our own.
* If we do, it will fail, so just ignore the error.
*/
AttachConsole (ATTACH_PARENT_PROCESS);
attach_strs = g_strsplit (attach_envvar, ",", -1);
for (i = 0; attach_strs[i]; i++)
{
if (g_strcmp0 (attach_strs[i], "stdout") == 0)
streams[1].redirect = TRUE;
else if (g_strcmp0 (attach_strs[i], "stderr") == 0)
streams[2].redirect = TRUE;
else if (g_strcmp0 (attach_strs[i], "stdin") == 0)
streams[0].redirect = TRUE;
else
g_warning ("Unrecognized stream name %s", attach_strs[i]);
}
g_strfreev (attach_strs);
for (i = 0; i < G_N_ELEMENTS (streams); i++)
{
int old_fd;
int backup_fd;
int new_fd;
int preferred_fd = i;
HANDLE std_handle;
errno_t errsv = 0;
if (!streams[i].redirect)
continue;
if (ferror (streams[i].stream) != 0)
{
g_warning ("Stream %s is in error state", streams[i].stream_name);
continue;
}
std_handle = GetStdHandle (streams[i].std_handle_type);
if (std_handle == INVALID_HANDLE_VALUE)
{
DWORD gle = GetLastError ();
g_warning ("Standard handle for %s can't be obtained: %lu",
streams[i].stream_name, gle);
continue;
}
old_fd = fileno (streams[i].stream);
/* We need the stream object to be associated with
* any valid integer fd for the code to work.
* If it isn't, reopen it with NUL (/dev/null) to
* ensure that it is.
*/
if (old_fd < 0)
{
if (freopen ("NUL", streams[i].mode, streams[i].stream) == NULL)
{
errsv = errno;
g_warning ("Failed to redirect %s: %d - %s",
streams[i].stream_name,
errsv,
strerror (errsv));
continue;
}
old_fd = fileno (streams[i].stream);
if (old_fd < 0)
{
g_warning ("Stream %s does not have a valid fd",
streams[i].stream_name);
continue;
}
}
new_fd = _open_osfhandle ((intptr_t) std_handle, streams[i].flags);
if (new_fd < 0)
{
g_warning ("Failed to create new fd for stream %s",
streams[i].stream_name);
continue;
}
backup_fd = dup (old_fd);
if (backup_fd < 0)
g_warning ("Failed to backup old fd %d for stream %s",
old_fd, streams[i].stream_name);
errno = 0;
/* Force old_fd to be associated with the same file
* as new_fd, i.e with the standard handle we need
* (or, rather, with the same kernel object; handle
* value will be different, but the kernel object
* won't be).
*/
/* NOTE: MSDN claims that _dup2() returns 0 on success and -1 on error,
* POSIX claims that dup2() reurns new FD on success and -1 on error.
* The "< 0" check satisfies the error condition for either implementation.
*/
if (_dup2 (new_fd, old_fd) < 0)
{
errsv = errno;
g_warning ("Failed to substitute fd %d for stream %s: %d : %s",
old_fd, streams[i].stream_name, errsv, strerror (errsv));
_close (new_fd);
if (backup_fd < 0)
continue;
errno = 0;
/* Try to restore old_fd back to its previous
* handle, in case the _dup2() call above succeeded partially.
*/
if (_dup2 (backup_fd, old_fd) < 0)
{
errsv = errno;
g_warning ("Failed to restore fd %d for stream %s: %d : %s",
old_fd, streams[i].stream_name, errsv, strerror (errsv));
}
_close (backup_fd);
continue;
}
/* Success, drop the backup */
if (backup_fd >= 0)
_close (backup_fd);
/* Sadly, there's no way to check that preferred_fd
* is currently valid, so we can't back it up.
* Doing operations on invalid FDs invokes invalid
* parameter handler, which is bad for us.
*/
if (old_fd != preferred_fd)
/* This extra code will also try to ensure that
* the expected file descriptors 0, 1 and 2 are
* associated with the appropriate standard
* handles.
*/
if (_dup2 (new_fd, preferred_fd) < 0)
g_warning ("Failed to dup fd %d into fd %d", new_fd, preferred_fd);
_close (new_fd);
}
}
/* This is a handle to the Vectored Exception Handler that
* we install on library initialization. If installed correctly,
* it will be non-NULL. Only used to later de-install the handler
* on library de-initialization.
*/
static void *WinVEH_handle = NULL;
#include "gwin32-private.c"
/* Handles exceptions (useful for debugging).
* Issues a DebugBreak() call if the process is being debugged (not really
* useful - if the process is being debugged, this handler won't be invoked
* anyway). If it is not, runs a debugger from G_DEBUGGER env var,
* substituting first %p in it for PID, and the first %e for the event handle -
* that event should be set once the debugger attaches itself (otherwise the
* only way out of WaitForSingleObject() is to time out after 1 minute).
* For example, G_DEBUGGER can be set to the following command:
* ```
* gdb.exe -ex "attach %p" -ex "signal-event %e" -ex "bt" -ex "c"
* ```
* This will make GDB attach to the process, signal the event (GDB must be
* recent enough for the signal-event command to be available),
* show the backtrace and resume execution, which should make it catch
* the exception when Windows re-raises it again.
* The command line can't be longer than MAX_PATH (260 characters).
*
* This function will only stop (and run a debugger) on the following exceptions:
* * EXCEPTION_ACCESS_VIOLATION
* * EXCEPTION_STACK_OVERFLOW
* * EXCEPTION_ILLEGAL_INSTRUCTION
* To make it stop at other exceptions one should set the G_VEH_CATCH
* environment variable to a list of comma-separated hexademical numbers,
* where each number is the code of an exception that should be caught.
* This is done to prevent GLib from breaking when Windows uses
* exceptions to shuttle information (SetThreadName(), OutputDebugString())
* or for control flow.
*
* This function deliberately avoids calling any GLib code.
*/
static LONG __stdcall
g_win32_veh_handler (PEXCEPTION_POINTERS ExceptionInfo)
{
EXCEPTION_RECORD *er;
char debugger[MAX_PATH + 1];
const char *debugger_env = NULL;
const char *catch_list;
gboolean catch = FALSE;
STARTUPINFO si;
PROCESS_INFORMATION pi;
HANDLE event;
SECURITY_ATTRIBUTES sa;
if (ExceptionInfo == NULL ||
ExceptionInfo->ExceptionRecord == NULL)
return EXCEPTION_CONTINUE_SEARCH;
er = ExceptionInfo->ExceptionRecord;
switch (er->ExceptionCode)
{
case EXCEPTION_ACCESS_VIOLATION:
case EXCEPTION_STACK_OVERFLOW:
case EXCEPTION_ILLEGAL_INSTRUCTION:
case EXCEPTION_BREAKPOINT: /* DebugBreak() raises this */
break;
default:
catch_list = getenv ("G_VEH_CATCH");
while (!catch &&
catch_list != NULL &&
catch_list[0] != 0)
{
unsigned long catch_code;
char *end;
errno = 0;
catch_code = strtoul (catch_list, &end, 16);
if (errno != NO_ERROR)
break;
catch_list = end;
if (catch_list != NULL && catch_list[0] == ',')
catch_list++;
if (catch_code == er->ExceptionCode)
catch = TRUE;
}
if (catch)
break;
return EXCEPTION_CONTINUE_SEARCH;
}
if (IsDebuggerPresent ())
{
/* This shouldn't happen, but still try to
* avoid recursion with EXCEPTION_BREAKPOINT and
* DebugBreak().
*/
if (er->ExceptionCode != EXCEPTION_BREAKPOINT)
DebugBreak ();
return EXCEPTION_CONTINUE_EXECUTION;
}
fprintf (stderr,
"Exception code=0x%lx flags=0x%lx at 0x%p",
er->ExceptionCode,
er->ExceptionFlags,
er->ExceptionAddress);
switch (er->ExceptionCode)
{
case EXCEPTION_ACCESS_VIOLATION:
fprintf (stderr,
". Access violation - attempting to %s at address 0x%p\n",
er->ExceptionInformation[0] == 0 ? "read data" :
er->ExceptionInformation[0] == 1 ? "write data" :
er->ExceptionInformation[0] == 8 ? "execute data" :
"do something bad",
(void *) er->ExceptionInformation[1]);
break;
case EXCEPTION_IN_PAGE_ERROR:
fprintf (stderr,
". Page access violation - attempting to %s at address 0x%p with status %Ix\n",
er->ExceptionInformation[0] == 0 ? "read from an inaccessible page" :
er->ExceptionInformation[0] == 1 ? "write to an inaccessible page" :
er->ExceptionInformation[0] == 8 ? "execute data in page" :
"do something bad with a page",
(void *) er->ExceptionInformation[1],
er->ExceptionInformation[2]);
break;
default:
fprintf (stderr, "\n");
break;
}
fflush (stderr);
debugger_env = getenv ("G_DEBUGGER");
if (debugger_env == NULL)
return EXCEPTION_CONTINUE_SEARCH;
/* Create an inheritable event */
memset (&si, 0, sizeof (si));
memset (&pi, 0, sizeof (pi));
memset (&sa, 0, sizeof (sa));
si.cb = sizeof (si);
sa.nLength = sizeof (sa);
sa.bInheritHandle = TRUE;
event = CreateEvent (&sa, FALSE, FALSE, NULL);
/* Put process ID and event handle into debugger commandline */
if (!_g_win32_subst_pid_and_event (debugger, G_N_ELEMENTS (debugger),
debugger_env, GetCurrentProcessId (),
(guintptr) event))
{
CloseHandle (event);
return EXCEPTION_CONTINUE_SEARCH;
}
/* Run the debugger */
debugger[MAX_PATH] = '\0';
if (0 != CreateProcessA (NULL,
debugger,
NULL,
NULL,
TRUE,
getenv ("G_DEBUGGER_OLD_CONSOLE") != NULL ? 0 : CREATE_NEW_CONSOLE,
NULL,
NULL,
&si,
&pi))
{
CloseHandle (pi.hProcess);
CloseHandle (pi.hThread);
/* If successful, wait for 60 seconds on the event
* we passed. The debugger should signal that event.
* 60 second limit is here to prevent us from hanging
* up forever in case the debugger does not support
* event signalling.
*/
WaitForSingleObject (event, 60000);
}
CloseHandle (event);
/* Now the debugger is present, and we can try
* resuming execution, re-triggering the exception,
* which will be caught by debugger this time around.
*/
if (IsDebuggerPresent ())
return EXCEPTION_CONTINUE_EXECUTION;
return EXCEPTION_CONTINUE_SEARCH;
}
void
g_crash_handler_win32_init (void)
{
if (WinVEH_handle != NULL)
return;
WinVEH_handle = AddVectoredExceptionHandler (0, &g_win32_veh_handler);
}
void
g_crash_handler_win32_deinit (void)
{
if (WinVEH_handle != NULL)
RemoveVectoredExceptionHandler (WinVEH_handle);
WinVEH_handle = NULL;
}
#endif
Reference in New Issue View Git Blame Copy Permalink