[Libguestfs] [PATCH nbdkit v2 1/4] common/include: Add function for subtracting struct timeval.

[Eric Blake]

On 9/28/19 3:02 PM, Richard W.M. Jones wrote:
> ---
>   common/include/test-tvdiff.c | 75 +++++++++++++++++++++++++++++-------
>   common/include/tvdiff.h      | 13 ++++++-
>   2 files changed, 74 insertions(+), 14 deletions(-)
> 

ACK


>   int
> -main (void)
> +main (int argc, char *argv[])

Not sure this part matters, but doesn't hurt either.

> +++ b/common/include/tvdiff.h
> @@ -40,7 +40,7 @@
>   #include <sys/time.h>
>   
>   /* Return the number of µs (microseconds) in y - x. */
> -static int64_t
> +static inline int64_t
>   tvdiff_usec (const struct timeval *x, const struct timeval *y)
>   {
>     int64_t usec;
> @@ -50,4 +50,15 @@ tvdiff_usec (const struct timeval *x, const struct timeval *y)
>     return usec;
>   }
>   
> +/* Return timeval difference as another struct timeval. z = y - x. */
> +static inline void
> +subtract_timeval (const struct timeval *x, const struct timeval *y,
> +                  struct timeval *z)
> +{
> +  int64_t usec = tvdiff_usec (x, y);
> +
> +  z->tv_sec = usec / 1000000;
> +  z->tv_usec = usec % 1000000;
> +}
> +
>   #endif /* NBDKIT_TVDIFF_H */
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org