%%	options

copyright owner	=	Dirk Krause
copyright year	=	2011-2014
license		=	bsd



%%	header

#include "dk3conf.h"
#include "dk3types.h"

#ifdef __cplusplus
extern "C" {
#endif

/**	Set new handler for the specified signal.
	@param	signo	Signal number.
	@param	fct	Handler function address.
	@return	The previous handler function address.
*/
dk3_signal_disp_t
dk3signal_set(int signo, dk3_signal_disp_t fct);

/**	Refresh signal handler, if only signal() mechanism available.
	Should be a signal handlers first action.
	@param	signo	Signal number.
	@param	fct	Handler function address.
*/
void
dk3signal_refresh(int signo, dk3_signal_disp_t fct);

/**	Find best available signal handling mechanism.
	@return	DK3_SIGNAL_HANDLING_TYPE_xxx.
*/
int
dk3signal_available(void);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk3all.h"



$!trace-include



#if DK3_HAVE_SIGACTION
/**	Set new signal disposition.
	@param	signo	Signal number of signal to modify.
	@param	fct	New signal disposition.
	@return	Previous signal disposition.
*/
static
dk3_signal_disp_t
dk3signal_sigaction(int signo, dk3_signal_disp_t fct)
{
  dk3_signal_disp_t	back = (dk3_signal_disp_t)SIG_ERR;
  struct sigaction	act, oact;

  act.sa_handler = fct;
  sigemptyset(&act.sa_mask);
  if(signo == SIGALRM) {
#ifdef SA_INTERRUPT
    act.sa_flags |= SA_INTERRUPT;
#else
#ifdef SA_RESTART
    act.sa_flags |= SA_RESTART;
#endif
#endif
  }
  if(sigaction(signo, &act, &oact) < 0) {
    back = (dk3_signal_disp_t)SIG_ERR;
  } else {
    back = (dk3_signal_disp_t)oact.sa_handler;
  }
  return back;
}
#endif


dk3_signal_disp_t
dk3signal_set(int signo, dk3_signal_disp_t fct)
{
  dk3_signal_disp_t	back = NULL;
#if DK3_HAVE_SIGACTION
/* + sigaction */
  back = dk3signal_sigaction(signo, fct);
/* - sigaction */
#else
#if DK3_HAVE_SIGSET
/* + sigset */
  back = (dk3_signal_disp_t)sigset(signo,fct);
/* - sigset */
#else
#if DK3_HAVE_SIGNAL
/* + signal */
  back = (dk3_signal_disp_t)signal(signo,fct);
/* - signal */
#else
#error	"No signal handling functions available"
#endif
#endif
#endif
  return back;
}



void
dk3signal_refresh(int signo, dk3_signal_disp_t fct)
{
#if DK3_HAVE_SIGACTION
#else
#if DK3_HAVE_SIGSET
#else
#if DK3_HAVE_SIGNAL
  (void)signal(signo, fct);
#else
#endif
#endif
#endif
}


int
dk3signal_available(void)
{
  int back = DK3_SIGNAL_HANDLING_TYPE_NONE;
#if DK3_HAVE_SIGACTION
  back = DK3_SIGNAL_HANDLING_TYPE_SIGACTION;
#else
#if DK3_HAVE_SIGSET
  back = DK3_SIGNAL_HANDLING_TYPE_SIGSET;
#else
#if DK3_HAVE_SIGNAL
  back = DK3_SIGNAL_HANDLING_TYPE_SIGNAL;
#endif
#endif
#endif
  return back;
}



/* vim: set ai sw=2 : */