Implicit declaration of set_timer

[littlevamp]

Hi,

I was hoping that someone can help me with this. When I ran the below codes, it stated that there is an implicit declaration of set_timer in line 6. But my set_timer function has already been declared after the main(). Why is this so?

#include<stdio.h>
#include<sys/time.h>
#include<signal.h>
#include<unistd.h>
int main() {
  if(set_ticker(500) == -1)
    perror("set_ticker");
  else
    while(1) pause();
  return 0;
}
 
int set_ticker(int n_msecs) {
  struct itimerval new_timeset; 
  long n_sec, n_usecs;
  n_sec = (n_msecs/1000);                     
  n_usecs = (n_msecs % 1000) * 1000L;         
  new_timeset.it_interval.tv_set = n_sec;   
  new_timeset.it_interval.tv_usec = n_usecs; 
  new_timeset.it_value.tv_sec = n_sec;     
  new_timeset.it_value.tv_usec = n_usecs;     
  return setitimer(ITIMER_REAL, &new_timeset, NULL);
} 

Will appreciate help, thanks in advance!

[v0id]

When you're making the implementation of the function after main(), you've to have a declaration before main() If you don't have that, it can't find the function inside main()

// This should be before main()
int set_ticker(int n_msecs);

I can't test your code, I'm on Windows, but I think it would work.

[littlevamp]

Thanks =)

The codes run well.

struct itimerval new_timeset;
long n_sec, n_usecs;
n_sec = n_msecs/1000;                      
n_usecs = (n_msecs % 1000) * 1000L;         
new_timeset.it_interval.tv_set = n_sec; 

However, there is some problem with this line: new_timeset.it_interval.tv_set = n_sec. There is this error: struct timeval has no member named tv_set. What is this error about?

[v0id]

The error is exactly about what it's saying. The struct "timeval" do not have a member called "tv_set." I can't help you on this one, because it's Linux-specific. Look up the documentations, and you'll probably find something useful.