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68a3f8962a
gopsutil's host.Uptime() calls the sysinfo(2) syscall. Inside an LXC container lxcfs virtualizes /proc/uptime but cannot intercept a syscall, so every container reported the host's uptime. Reads /proc/uptime on linux and falls back to host.Uptime() if the file is missing or unparseable, so other platforms are unchanged.
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
//go:build linux
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package agent
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import (
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"math"
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"os"
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"strconv"
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"strings"
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"github.com/shirou/gopsutil/v4/host"
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)
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// uptimeFilePath is a variable so tests can point it at a fixture.
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var uptimeFilePath = "/proc/uptime"
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// getUptime returns the system uptime in seconds.
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//
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// This reads /proc/uptime instead of using host.Uptime(), which calls the
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// sysinfo(2) syscall. Inside an LXC container lxcfs virtualizes /proc/uptime
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// but cannot intercept a syscall, so sysinfo(2) reports the host's uptime
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// rather than the container's.
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//
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// Falls back to host.Uptime() if /proc/uptime is missing or unparseable, so
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// behavior is unchanged anywhere the file isn't available.
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func getUptime() (uint64, error) {
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data, err := os.ReadFile(uptimeFilePath)
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if err != nil {
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return host.Uptime()
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}
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fields := strings.Fields(string(data))
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if len(fields) == 0 {
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return host.Uptime()
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}
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seconds, err := strconv.ParseFloat(fields[0], 64)
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if err != nil ||
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math.IsNaN(seconds) ||
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math.IsInf(seconds, 0) ||
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seconds < 0 ||
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seconds >= 1<<64 {
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return host.Uptime()
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}
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return uint64(seconds), nil
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}
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