Implement basic Solaris loadavg support.

Gopkg.toml

@@ -33,6 +33,10 @@
   branch = "master"
   name = "github.com/shirou/w32"
 
+[[constraint]]
+  branch = "master"
+  name = "github.com/siebenmann/go-kstat"
+
 [[constraint]]
   name = "github.com/stretchr/testify"
   version = "1.2.2"

load/load_fallback.go

@@ -1,4 +1,4 @@
-// +build !darwin,!linux,!freebsd,!openbsd,!windows
+// +build !darwin,!linux,!freebsd,!openbsd,!windows,!solaris
 
 package load
 

load/load_solaris.go

@@ -0,0 +1,49 @@
+// +build solaris
+
+package load
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/siebenmann/go-kstat"
+)
+
+func Avg() (*AvgStat, error) {
+	return AvgWithContext(context.Background())
+}
+
+func AvgWithContext(ctx context.Context) (*AvgStat, error) {
+	tok, err := kstat.Open()
+	if err != nil {
+		return nil, fmt.Errorf("Open failure: %s", err)
+	}
+
+	ks, err := tok.Lookup("unix", -1, "system_misc")
+	if err != nil {
+		return nil, fmt.Errorf("lookup failure on unix:-1:system_misc: %s", err)
+	}
+
+	load1, err := ks.GetNamed("avenrun_1min")
+	if err != nil {
+		return nil, err
+	}
+
+	load5, err := ks.GetNamed("avenrun_5min")
+	if err != nil {
+		return nil, err
+	}
+
+	load15, err := ks.GetNamed("avenrun_15min")
+	if err != nil {
+		return nil, err
+	}
+
+	ret := &AvgStat{
+		Load1: float64(load1.UintVal) / 256,
+		Load5: float64(load5.UintVal) / 256,
+		Load15: float64(load15.UintVal) / 256,
+	}
+
+	return ret, nil
+}