test10~2.txt

Linux下的C语言编程

#include <signal.h>

sigfunc *signal(int signumber, sigfunc *func)
{
	struct sigaction act, oact;
	act.sa_handler=func;
	sigemptyset(&act.sa_mask);
	act.sa_flags=0;
	if(signumber==SIGALRM)
	{
		#ifdef SA_INTERRUPT
		act.sa_flags!=SA_INTERRUPT;
		#endif
	}
	else
	{
		#ifdef SA_RESTART
		act.sa_flags=SA_RESTART;
		#endif
	}

	if(sigaction(signumber,&act, &oact)<0)
	{
		return(SIG_ERR);
	}

	return(oact.sa_handler);
}