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ACE_Sig_Handlers Class Reference

This is an alternative signal handling dispatcher for ACE. It allows a list of signal handlers to be registered for each signal. It also makes SA_RESTART the default mode. More...

#include <Signal.h>

Inheritance diagram for ACE_Sig_Handlers:

[legend]Collaboration diagram for ACE_Sig_Handlers:

[legend]List of all members.

Public Methods
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)
virtual ACE_Event_Handler *	handler (int signum, ACE_Event_Handler *)
void	dump (void) const
	Dump the state of an object.
Static Public Methods
void	dispatch (int signum, siginfo_t *, ucontext_t *)
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Static Private Attributes
int	sigkey_ = 0
int	third_party_sig_handler_ = 0

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Detailed Description

This is an alternative signal handling dispatcher for ACE. It allows a list of signal handlers to be registered for each signal. It also makes SA_RESTART the default mode.

Using this class a program can register one or more 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> methods of all the registered ACE_Event_Handlers are invoked automatically.

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Member Function Documentation

void ACE_Sig_Handlers::dispatch (  int    signum, siginfo_t *   , ucontext_t *    )  [static]

Callback routine registered with sigaction(2) that dispatches the <handle_signal> method of all the pre-registered ACE_Event_Handlers for <signum> Reimplemented from ACE_Sig_Handler.

void ACE_Sig_Handlers::dump (  void    )  const

Dump the state of an object. Reimplemented from ACE_Sig_Handler.

ACE_Event_Handler * ACE_Sig_Handlers::handler (  int    signum, ACE_Event_Handler *    )  [virtual]

Set a new <ACE_Event_Handler> that is associated with SIGNUM at the head of the list of signals. Return the existing handler that was at the head. Reimplemented from ACE_Sig_Handler.

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

Return the head of the list of <ACE_Sig_Handler>s associated with SIGNUM. Reimplemented from ACE_Sig_Handler.

int ACE_Sig_Handlers::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 a <sigkey> that is >= 0 on success. Reimplemented from ACE_Sig_Handler.

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

Remove an <ACE_Event_Handler> currently associated with <signum>. We remove the handler if (1) its <sigkey> matches the <sigkey> passed as a parameter or (2) if we've been told to remove all the handlers, i.e., <sigkey> == -1. If a new disposition is given it is installed and the previous disposition is returned (if desired by the caller). Returns 0 on success and -1 if <signum> is invalid. Reimplemented from ACE_Sig_Handler.

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Member Data Documentation

ACE_Sig_Handlers::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks. Reimplemented from ACE_Sig_Handler.

int ACE_Sig_Handlers::sigkey_ = 0 [static, private]

Keeps track of the id that uniquely identifies each registered signal handler. This id can be used to cancel a timer via the <remove_handler> method.

int ACE_Sig_Handlers::third_party_sig_handler_ = 0 [static, private]

If this is > 0 then a 3rd party library has registered a handler...

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The documentation for this class was generated from the following files:

• Signal.h
• Signal.cpp

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