KCrash Namespace Reference

Typedefs
typedef QFlags< CrashFlag >	CrashFlags
typedef void(*	HandlerType) (int)

Enumerations
enum	CrashFlag { KeepFDs = 1 , SaferDialog = 2 , AlwaysDirectly , AutoRestart = 8 }

Functions
KCRASH_EXPORT HandlerType	crashHandler ()
KCRASH_EXPORT void	defaultCrashHandler (int signal)
KCRASH_EXPORT HandlerType	emergencySaveFunction ()
std::optional< ExceptionMetadata >	exceptionMetadata ()
KCRASH_EXPORT void	initialize ()
KCRASH_EXPORT bool	isDrKonqiEnabled ()
void	setApplicationFilePath (const QString &filePath)
KCRASH_EXPORT void	setCrashHandler (HandlerType handler=defaultCrashHandler)
KCRASH_EXPORT void	setDrKonqiEnabled (bool enabled)
KCRASH_EXPORT void	setEmergencySaveFunction (HandlerType saveFunction=nullptr)
KCRASH_EXPORT void	setErrorMessage (const QString &message)
KCRASH_EXPORT void	setFlags (KCrash::CrashFlags flags)
void	startProcess (int argc, const char *argv[], bool waitAndExit)

Detailed Description

This namespace contains functions to handle crashes.

It allows you to set a crash handler function that will be called when your application crashes and also provides a default crash handler that implements the following functionality:

• Launches the KDE crash display application (DrKonqi) to let the user report the bug and/or debug it.
• Calls an emergency save function that you can set with setEmergencySaveFunction() to attempt to save the application's data.
• Autorestarts your application.

Note

All the above features are optional and you need to enable them explicitly. By default, the defaultCrashHandler() will not do anything. However, if you are using KApplication, it will by default enable launching DrKonqi on crashes, unless the –nocrashhandler argument was passed on the command line or the environment variable KDE_DEBUG is set to any value.

Typedef Documentation

CrashFlags

typedef QFlags< CrashFlag > KCrash::CrashFlags

Stores a combination of CrashFlag values.

Definition at line 117 of file kcrash.h.

HandlerType

typedef void(* KCrash::HandlerType) (int)

Typedef for a pointer to a crash handler function.

The function's argument is the number of the signal.

Definition at line 62 of file kcrash.h.

Enumeration Type Documentation

CrashFlag

enum KCrash::CrashFlag

Options to determine how the default crash handler should behave.

See also

CrashFlags

Enumerator
KeepFDs	don't close all file descriptors immediately
SaferDialog	start DrKonqi without arbitrary disk access
AlwaysDirectly	never try to to start DrKonqi via kdeinit. Use fork() and exec() instead. Deprecated This is now the default, and does not need to be set.
AutoRestart	autorestart this application. Only sensible for KUniqueApplications. Since 4.1.

Definition at line 107 of file kcrash.h.

Function Documentation

crashHandler()

KCrash::HandlerType KCrash::crashHandler

(

)

Returns the installed crash handler.

Returns

the crash handler

Definition at line 427 of file kcrash.cpp.

defaultCrashHandler()

void KCrash::defaultCrashHandler

(

int

signal

)

The default crash handler.

Do not call this function directly. Instead, use setCrashHandler() to set it as your application's crash handler.

Parameters

signal

the signal number

Note

If you implement your own crash handler, you will have to call this function from your implementation if you want to use the features of this namespace.

Definition at line 450 of file kcrash.cpp.

emergencySaveFunction()

KCrash::HandlerType KCrash::emergencySaveFunction

(

)

Returns the currently set emergency save function.

Returns

the emergency save function

Definition at line 278 of file kcrash.cpp.

exceptionMetadata()

std::optional< ExceptionMetadata > KCrash::exceptionMetadata

(

)

Definition at line 34 of file exception.cpp.

initialize()

void KCrash::initialize

(

)

Initialize KCrash.

This does nothing if $KDE_DEBUG is set.

Call this in your main() after setting up KAboutData to ensure that the crash handler is launched.

Since

5.15

Definition at line 204 of file kcrash.cpp.

isDrKonqiEnabled()

bool KCrash::isDrKonqiEnabled

(

)

Returns true if DrKonqi is set to be launched from the crash handler or false otherwise.

Since

4.5

Definition at line 369 of file kcrash.cpp.

setApplicationFilePath()

void KCrash::setApplicationFilePath

(

const QString &

filePath

)

Definition at line 323 of file kcrash.cpp.

setCrashHandler()

void KCrash::setCrashHandler

(

HandlerType

handler = defaultCrashHandler

)

Install a function to be called when a crash occurs.

A crash occurs when one of the following signals is caught: SIGSEGV, SIGBUS, SIGFPE, SIGILL, SIGABRT.

Parameters

handler

this can be one of: null, in which case signal catching is disabled (by setting the signal handler for the crash signals to SIG_DFL) a user defined function in the form: static (if in a class) void myCrashHandler(int); if handler is omitted, the default crash handler is installed

Note

If you use setDrKonqiEnabled(true), setEmergencySaveFunction(myfunc) or setFlags(AutoRestart), you do not need to call this function explicitly. The default crash handler is automatically installed by those functions if needed. However, if you set a custom crash handler, those functions will not change it.

Definition at line 374 of file kcrash.cpp.

setDrKonqiEnabled()

void KCrash::setDrKonqiEnabled

(

bool

enabled

)

Enables or disables launching DrKonqi from the crash handler.

By default, launching DrKonqi is enabled when QCoreApplication is created. To disable it:

void disableDrKonqi()
{
    KCrash::setDrKonqiEnabled(false);
}
Q_CONSTRUCTOR_FUNCTION(disableDrKonqi)

Note

It is the crash handler's responsibility to launch DrKonqi. Therefore, if no crash handler is set, this method also installs the default crash handler to ensure that DrKonqi will be launched.

Since

4.5

Definition at line 346 of file kcrash.cpp.

setEmergencySaveFunction()

void KCrash::setEmergencySaveFunction

(

HandlerType

saveFunction = nullptr

)

Installs a function which should try to save the application's data.

Note

It is the crash handler's responsibility to call this function. Therefore, if no crash handler is set, the default crash handler is installed to ensure the save function will be called.

Parameters

saveFunction

the handler to install

Definition at line 265 of file kcrash.cpp.

setErrorMessage()

void KCrash::setErrorMessage

(

const QString &

message

)

Allows providing information to be included in the bug report.

Since

5.69

Definition at line 772 of file kcrash.cpp.

setFlags()

void KCrash::setFlags

(

KCrash::CrashFlags

flags

)

Set options to determine how the default crash handler should behave.

Parameters

flags

ORed together CrashFlags

Definition at line 308 of file kcrash.cpp.

startProcess()

void KCrash::startProcess	(	int	argc,
		const char *	argv[],
		bool	waitAndExit )

Definition at line 700 of file kcrash.cpp.