ITWorx Pulse release export
bd774932d5
Public source validation / validate (push) Failing after 3m8s
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
//go:build linux
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package hostcollect
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import (
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"math"
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"syscall"
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"github.com/itworx/pulse/internal/host"
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)
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// Bits of the adjtimex status word, defined here because the standard syscall package
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// does not export them on every architecture.
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const (
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staUnsync = 0x0040 // clock is not synchronised to a reference
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staNano = 0x2000 // offset and precision are in nanoseconds, not microseconds
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timeError = 5 // adjtimex state: the clock is not synchronised
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)
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// readClockSync asks the kernel about clock discipline with adjtimex(2) in read mode.
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//
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// A zeroed Timex has Modes == 0, which makes the call a pure read: it adjusts nothing.
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// Docker's default seccomp profile still gates adjtimex behind CAP_SYS_TIME, which the
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// agent drops, so the expected in-container result is EPERM. The caller turns that into
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// a warning; see Collector.clock.
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func readClockSync() (host.RawTime, error) {
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timex := syscall.Timex{}
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state, err := syscall.Adjtimex(&timex)
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if err != nil {
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return host.RawTime{}, err
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}
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divisor := 1e6
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if timex.Status&staNano != 0 {
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divisor = 1e9
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}
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offset := math.Abs(float64(timex.Offset)) / divisor
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if math.IsNaN(offset) || math.IsInf(offset, 0) {
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offset = 0
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}
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return host.RawTime{
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Synchronized: timex.Status&staUnsync == 0 && state != timeError,
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// The kernel exposes no stratum; that belongs to the NTP daemon, which the
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// agent deliberately does not talk to.
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OffsetSeconds: offset,
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}, nil
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}
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