libpod: Enable 'podman info' for FreeBSD

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

libpod/info.go

@@ -1,6 +1,3 @@
-//go:build linux
-// +build linux
-
 package libpod
 
 import (

libpod/info_freebsd.go

@@ -0,0 +1,40 @@
+package libpod
+
+import (
+	"fmt"
+	"unsafe"
+
+	"github.com/containers/podman/v4/libpod/define"
+	"golang.org/x/sys/unix"
+)
+
+func (r *Runtime) setPlatformHostInfo(info *define.HostInfo) error {
+	return nil
+}
+
+func timeToPercent(time uint64, total uint64) float64 {
+	return 100.0 * float64(time) / float64(total)
+}
+
+// getCPUUtilization Returns a CPUUsage object that summarizes CPU
+// usage for userspace, system, and idle time.
+func getCPUUtilization() (*define.CPUUsage, error) {
+	buf, err := unix.SysctlRaw("kern.cp_time")
+	if err != nil {
+		return nil, fmt.Errorf("error reading sysctl kern.cp_time: %w", err)
+	}
+
+	var total uint64 = 0
+	var times [unix.CPUSTATES]uint64
+
+	for i := 0; i < unix.CPUSTATES; i++ {
+		val := *(*uint64)(unsafe.Pointer(&buf[8*i]))
+		times[i] = val
+		total += val
+	}
+	return &define.CPUUsage{
+		UserPercent:   timeToPercent(times[unix.CP_USER], total),
+		SystemPercent: timeToPercent(times[unix.CP_SYS], total),
+		IdlePercent:   timeToPercent(times[unix.CP_IDLE], total),
+	}, nil
+}

libpod/info_unsupported.go

@@ -1,5 +1,5 @@
-//go:build !linux
-// +build !linux
+//go:build !linux && !freebsd
+// +build !linux,!freebsd
 
 package libpod