507ce79080
This adds two clock interfaces: sys.Walltime and sys.Nanotime to allow implementations to override readings for purposes of security or determinism. The default values of both are a fake timestamp, to avoid the sandbox break we formerly had by returning the real time. This is similar to how we don't inherit OS Env values.
22 lines
900 B
Go
22 lines
900 B
Go
package sys
|
|
|
|
import "context"
|
|
|
|
// ClockResolution is a positive granularity of clock precision in
|
|
// nanoseconds. For example, if the resolution is 1us, this returns 1000.
|
|
//
|
|
// Note: Some implementations return arbitrary resolution because there's
|
|
// no perfect alternative. For example, according to the source in time.go,
|
|
// windows monotonic resolution can be 15ms. See /RATIONALE.md.
|
|
type ClockResolution uint32
|
|
|
|
// Walltime returns the current time in epoch seconds with a nanosecond fraction.
|
|
type Walltime func(context.Context) (sec int64, nsec int32)
|
|
|
|
// Nanotime returns nanoseconds since an arbitrary start point, used to measure
|
|
// elapsed time. This is sometimes referred to as a tick or monotonic time.
|
|
//
|
|
// Note: There are no constraints on the value return except that it
|
|
// increments. For example, -1 is a valid if the next value is >= 0.
|
|
type Nanotime func(context.Context) int64
|