Sigfunc_rt *
Signal_rt(int signo, Sigfunc_rt *func)
{
Sigfunc_rt *sigfunc;
if ( (sigfunc = signal_rt(signo, func)) == (Sigfunc_rt *) SIG_ERR)
err_sys("signal_rt error");
return(sigfunc);
}
int main(int argc, char const *argv[])
{
int i,j;
pid_t pid;
sigset_t newset;
union sigval val;
printf("SIGRTMIN =%d,SIGRTMAX= %d\n",(int)SIGRTMIN,(int)SIGRTMAX);
if (0 ==(pid = fork()))
{
sigemptyset(&newset);
sigaddset(&newset,SIGRTMAX);
sigaddset(&newset,SIGRTMAX-1);
sigaddset(&newset,SIGRTMAX-2);
sigprocmask(SIG_BLOCK,&newset,NULL);
signal_rt(SIGRTMAX,sig_rt,&newset);
signal_rt(SIGRTMAX-1,sig_rt,&newset);
signal_rt(SIGRTMAX-2,sig_rt,&newset);
printf("child sleep 6s------\n");
sleep(6);
sigprocmask(SIG_UNBLOCK,&newset,NULL);
printf("child sleep 3s------\n");
sleep(3);
exit(0);
}
printf("father sleep 3s------\n");
sleep(3);
for (i = SIGRTMAX; i >= SIGRTMAX-2; i--)
{
for (j = 0; j <=2; ++j)
{
val.sival_int =j;
sigqueue(pid,i,val);
printf("send signal %d,val=%d\n", i,j);
}
}
return 0;
}
int main(int argc,char **argv)
{
int i,j;
pid_t pid;
sigset_t newset;
union sigval val;
printf("SIGRTMIN = %d,SIGRTMAX = %d\n",(int) SIGRTMIN,(int )SIGRTMAX );
if((pid=Fork())==0)
{
Sigemptyset(&newset);
Sigaddset(&newset,SIGRTMAX);
Sigaddset(&newset,SIGRTMAX-1);
Sigaddset(&newset,SIGRTMAX-2);
Sigprocmask(SIG_BLOCK,&newset,NULL);
Signal_rt(SIGRTMAX,sig_rt);
Signal_rt(SIGRTMAX-1,sig_rt);
signal_rt(SIGRTMAX-2,sig_rt);
sleep(6);
Sigprocmask(SIG_UNBLOCK,&newset,NULL);
sleep(3);
exit(0);
}
sleep(3);
for(i=SIGRTMAX;i>=SIGRTMAX-2;i--)
{
for(j=0;j<=2;j++)
{
val.sival_int=j;
Sigqueue(pid,i,val);
printf("sent signal %d, val= %d\n",i,j);
}
}
exit(0);
}
