将time_t转换为timeval

Question

I am facing problem in converting the time_t to struct timeval . I need the tv_usec & tv_sec value to be get populated from the time_t value.

In order to populate tv_sec and tv_usec we need to call gettimeofday() . But i dont want to call that function since i have time in time_t . From the time_t i want to extract/convert to milliseconds. Since existing code they use struct timeval for populating.

If you could suggest how to get millisecond from time_t would be great.

Any help on this would be really appreciated. Thanks in advance.

Answer 1

Definition of struct timeval (in <sys/time.h> ) :

struct timeval 
{
     time_t      tv_sec;     /* seconds */
     suseconds_t tv_usec;    /* microseconds */
};

And as you can see, time_t can only hold seconds , you cannot get milliseconds from time_t . If you really want to work with a timeval object, you can simply define a timeval object, and manually add the time_t variable to it. ie,

time_t time_here; //Your time_t variable.
timeval time_now; //Your timeval object.
time_now.tv_sec = time_here; //Assign time_here to this object.
time_now.tv_usec = 0; //As time_t can hold only seconds.