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#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <time.h>
 
int n=0;
timer_t timerid;
 
void beep(sigval_t sig)
{
        struct  itimerspec timeval;
 
        printf("%d x %d = %d\n", n/8+2, n%8+2, (n/8+2)*(n%8+2));
        n++;
 
        if (n>=64) {
                memset(&timeval, 0, sizeof(timeval));
                timer_settime(timerid, 0, &timeval, NULL);
        }
}
 
int main(void)
{
        struct  sigevent sigev;
        struct  itimerspec timeval;
        struct  timespec ts;
 
        memset(&sigev, 0, sizeof(sigev));
        sigev.sigev_notify = SIGEV_THREAD;
        sigev.sigev_notify_function = beep;
 
        timeval.it_interval.tv_sec = 0;
        timeval.it_interval.tv_nsec = 100000000;
        timeval.it_value.tv_sec = 0;
        timeval.it_value.tv_nsec = 100000000;
 
        timer_create(CLOCK_MONOTONIC, &sigev, &timerid);
        timer_settime(timerid, 0, &timeval, NULL);
 
        ts.tv_sec = 7;
        ts.tv_nsec = 0;
        nanosleep(&ts, NULL);
 
        timer_delete(timerid);
 
        return 0;
}
 

prog.c:7:1: error: unknown type name ‘timer_t’
 timer_t timerid;
 ^~~~~~~
prog.c:9:11: error: unknown type name ‘sigval_t’
 void beep(sigval_t sig)
           ^~~~~~~~
prog.c: In function ‘main’:
prog.c:24:26: error: storage size of ‘sigev’ isn’t known
         struct  sigevent sigev;
                          ^~~~~
prog.c:25:28: error: storage size of ‘timeval’ isn’t known
         struct  itimerspec timeval;
                            ^~~~~~~
prog.c:29:30: error: ‘SIGEV_THREAD’ undeclared (first use in this function)
         sigev.sigev_notify = SIGEV_THREAD;
                              ^~~~~~~~~~~~
prog.c:29:30: note: each undeclared identifier is reported only once for each function it appears in
prog.c:30:39: error: ‘beep’ undeclared (first use in this function)
         sigev.sigev_notify_function = beep;
                                       ^~~~
prog.c:37:9: warning: implicit declaration of function ‘timer_create’ [-Wimplicit-function-declaration]
         timer_create(CLOCK_MONOTONIC, &sigev, &timerid);
         ^~~~~~~~~~~~
prog.c:37:22: error: ‘CLOCK_MONOTONIC’ undeclared (first use in this function)
         timer_create(CLOCK_MONOTONIC, &sigev, &timerid);
                      ^~~~~~~~~~~~~~~
prog.c:38:9: warning: implicit declaration of function ‘timer_settime’ [-Wimplicit-function-declaration]
         timer_settime(timerid, 0, &timeval, NULL);
         ^~~~~~~~~~~~~
prog.c:42:9: warning: implicit declaration of function ‘nanosleep’ [-Wimplicit-function-declaration]
         nanosleep(&ts, NULL);
         ^~~~~~~~~
prog.c:44:9: warning: implicit declaration of function ‘timer_delete’ [-Wimplicit-function-declaration]
         timer_delete(timerid);
         ^~~~~~~~~~~~
prog.c:25:28: warning: unused variable ‘timeval’ [-Wunused-variable]
         struct  itimerspec timeval;
                            ^~~~~~~
prog.c:24:26: warning: unused variable ‘sigev’ [-Wunused-variable]
         struct  sigevent sigev;
                          ^~~~~

Standard output is empty