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Clock_getres function

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# 1  
Old 12-15-2012
Clock_getres function
Hi

clock_getres(clockid_t clock_id, struct timespec *res);

I cant understand what is the mining of the return value (*res) from clock_getres function.

1. what is that resolution ?

2. how can I use it ?

3. if clock_getres function return 999958 in *res, what its mean ?

4. when I go to sleep with clock_nanosleep for 20000000 nanoseconds and wake up after 999958 nanoseconds (with out my interrupt of signal handler) is it because of the resolution ?

Thank's
# 2  
Old 12-15-2012
Code:
struct timespec
{
   time_t tv_sec;
   long tv_nsec;
};

tv_sec is the number of seconds
tv_nsec is the number of nanoseconds
Code:
#include <stdio.h>
#include <unistd.h>
#include <time.h>

int
main()
{
   struct timespec  clock_resolution={0,0};
   int return_value=0;
   
   return_value = clock_getres(CLOCK_REALTIME, &clock_resolution);
   
   printf("Clock resolution is %d seconds, %ld nanoseconds\n",
        clock_resolution.tv_sec, clock_resolution.tv_nsec);
   
   return 0;  
}

output on my desktop is:
Code:
Clock resolution is 0 seconds, 1000000 nanoseconds

compile and run the code. Then come back with more questions.
# 3  
Old 12-15-2012
Hi
I run it and get 0 seconds and get 999958
what it means ?

and what your results means ?

is there a relation between the results of clock_getres and the number of nanos clock_nanosleep can sleep ?
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