This is the main dispatcher of signals for ACE. It improves the existing UNIX signal handling mechanism by allowing C++ objects to handle signals in a way that avoids the use of global/static variables and functions. More...

#include <Sig_Handler.h>

Inheritance diagram for ACE_Sig_Handler:

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Collaboration diagram for ACE_Sig_Handler:

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List of all members.

Public Member Functions
	ACE_Sig_Handler (void)
	Default constructor.
virtual	~ACE_Sig_Handler (void)
	Destructor.
virtual int	register_handler (int signum, ACE_Event_Handler new_sh, ACE_Sig_Action new_disp=0, ACE_Event_Handler *old_sh=0, ACE_Sig_Action old_disp=0)
virtual int	remove_handler (int signum, ACE_Sig_Action new_disp=0, ACE_Sig_Action old_disp=0, int sigkey=-1)
virtual ACE_Event_Handler *	handler (int signum)
	Return the ACE_Sig_Handler associated with signum.
virtual ACE_Event_Handler *	handler (int signum, ACE_Event_Handler *)
void	dump (void) const
	Dump the state of an object.
Static Public Member Functions
static int	sig_pending (void)
	True if there is a pending signal.
static void	sig_pending (int)
	Reset the value of <sig_pending_> so that no signal is pending.
static void	dispatch (int, siginfo_t , ucontext_t )
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Static Protected Member Functions
static ACE_Event_Handler *	handler_i (int signum, ACE_Event_Handler *)
static int	register_handler_i (int signum, ACE_Event_Handler new_sh, ACE_Sig_Action new_disp=0, ACE_Event_Handler *old_sh=0, ACE_Sig_Action old_disp=0)
static int	in_range (int signum)
	Check whether the SIGNUM is within the legal range of signals.
Static Protected Attributes
static sig_atomic_t	sig_pending_ = 0
	Keeps track of whether a signal is pending.
Static Private Attributes
static ACE_Event_Handler *	signal_handlers_ [ACE_NSIG]

Detailed Description

This is the main dispatcher of signals for ACE. It improves the existing UNIX signal handling mechanism by allowing C++ objects to handle signals in a way that avoids the use of global/static variables and functions.

Using this class a program can register an ACE_Event_Handler with the ACE_Sig_Handler in order to handle a designated signum. When a signal occurs that corresponds to this signum, the handle_signal method of the registered ACE_Event_Handler is invoked automatically.

Constructor & Destructor Documentation

ACE_Sig_Handler::ACE_Sig_Handler ( void ) [inline]

Default constructor.

ACE_Sig_Handler::~ACE_Sig_Handler ( void ) [virtual]

Destructor.

Member Function Documentation

void ACE_Sig_Handler::dispatch	(	int	signum,
		siginfo_t *	siginfo,
		ucontext_t *	ucontext
	)		`[static]`

Callback routine registered with sigaction(2) that dispatches the <handle_signal> method of the appropriate pre-registered ACE_Event_Handler.

Reimplemented in ACE_Sig_Handlers.

void ACE_Sig_Handler::dump ( void ) const

Dump the state of an object.

Reimplemented in ACE_Sig_Handlers.

ACE_Event_Handler * ACE_Sig_Handler::handler ( int signum ) [virtual]

Return the ACE_Sig_Handler associated with signum.

Reimplemented in ACE_Sig_Handlers.

ACE_Event_Handler * ACE_Sig_Handler::handler	(	int	signum,
		ACE_Event_Handler *	new_sh
	)		`[virtual]`

Set a new ACE_Event_Handler that is associated with signum. Return the existing handler.

Reimplemented in ACE_Sig_Handlers.

ACE_Event_Handler * ACE_Sig_Handler::handler_i	(	int	signum,
		ACE_Event_Handler *	new_sh
	)		`[static, protected]`

Set a new ACE_Event_Handler that is associated with signum. Return the existing handler. Does not acquire any locks so that it can be called from a signal handler, such as <dispatch>.

int ACE_Sig_Handler::in_range ( int signum ) [inline, static, protected]

Check whether the SIGNUM is within the legal range of signals.

int ACE_Sig_Handler::register_handler	(	int	signum,
		ACE_Event_Handler *	new_sh,
		ACE_Sig_Action *	new_disp = `0`,
		ACE_Event_Handler **	old_sh = `0`,
		ACE_Sig_Action *	old_disp = `0`
	)		`[virtual]`

Add a new ACE_Event_Handler and a new sigaction associated with signum. Passes back the existing ACE_Event_Handler and its sigaction if pointers are non-zero. Returns -1 on failure and >= 0 on success.

Reimplemented in ACE_Sig_Handlers.

int ACE_Sig_Handler::register_handler_i	(	int	signum,
		ACE_Event_Handler *	new_sh,
		ACE_Sig_Action *	new_disp = `0`,
		ACE_Event_Handler **	old_sh = `0`,
		ACE_Sig_Action *	old_disp = `0`
	)		`[static, protected]`

This implementation method is called by <register_handler> and dispatch. It doesn't do any locking so that it can be called within a signal handler, such as dispatch. It adds a new ACE_Event_Handler and a new sigaction associated with signum. Passes back the existing ACE_Event_Handler and its sigaction if pointers are non-zero. Returns -1 on failure and >= 0 on success.

int ACE_Sig_Handler::remove_handler	(	int	signum,
		ACE_Sig_Action *	new_disp = `0`,
		ACE_Sig_Action *	old_disp = `0`,
		int	sigkey = `-1`
	)		`[virtual]`

Remove the ACE_Event_Handler currently associated with signum. sigkey is ignored in this implementation since there is only one instance of a signal handler. Install the new disposition (if given) and return the previous disposition (if desired by the caller). Returns 0 on success and -1 if signum is invalid.

Reimplemented in ACE_Sig_Handlers.

int ACE_Sig_Handler::sig_pending ( void ) [static]

True if there is a pending signal.

void ACE_Sig_Handler::sig_pending ( int pending ) [static]

Reset the value of <sig_pending_> so that no signal is pending.