container: move scheduler policy constants to std

This avoids depending on cgo.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/std/syscall_test.go

@@ -1,6 +1,11 @@
 package std_test
 
 import (
+	"encoding/json"
+	"errors"
+	"math"
+	"reflect"
+	"syscall"
 	"testing"
 
 	"hakurei.app/container/std"
@@ -19,3 +24,90 @@ func TestSyscallResolveName(t *testing.T) {
 		})
 	}
 }
+
+func TestSchedPolicyJSON(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		policy    std.SchedPolicy
+		want      string
+		encodeErr error
+		decodeErr error
+	}{
+		{std.SCHED_NORMAL, `""`, nil, nil},
+		{std.SCHED_FIFO, `"fifo"`, nil, nil},
+		{std.SCHED_RR, `"rr"`, nil, nil},
+		{std.SCHED_BATCH, `"batch"`, nil, nil},
+		{4, `"invalid policy 4"`, syscall.EINVAL, std.InvalidSchedPolicyError("invalid policy 4")},
+		{std.SCHED_IDLE, `"idle"`, nil, nil},
+		{std.SCHED_DEADLINE, `"deadline"`, nil, nil},
+		{std.SCHED_EXT, `"ext"`, nil, nil},
+		{math.MaxInt, `"iso"`, syscall.EINVAL, std.InvalidSchedPolicyError("iso")},
+	}
+	for _, tc := range testCases {
+		name := tc.policy.String()
+		if tc.policy == std.SCHED_NORMAL {
+			name = "normal"
+		}
+
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			got, err := json.Marshal(tc.policy)
+			if !errors.Is(err, tc.encodeErr) {
+				t.Fatalf("Marshal: error = %v, want %v", err, tc.encodeErr)
+			}
+			if err == nil && string(got) != tc.want {
+				t.Fatalf("Marshal: %s, want %s", string(got), tc.want)
+			}
+
+			var v std.SchedPolicy
+			if err = json.Unmarshal([]byte(tc.want), &v); !reflect.DeepEqual(err, tc.decodeErr) {
+				t.Fatalf("Unmarshal: error = %v, want %v", err, tc.decodeErr)
+			}
+			if err == nil && v != tc.policy {
+				t.Fatalf("Unmarshal: %d, want %d", v, tc.policy)
+			}
+		})
+	}
+}
+
+func TestSchedPolicyMinMax(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		policy   std.SchedPolicy
+		min, max std.Int
+		err      error
+	}{
+		{std.SCHED_NORMAL, 0, 0, nil},
+		{std.SCHED_FIFO, 1, 99, nil},
+		{std.SCHED_RR, 1, 99, nil},
+		{std.SCHED_BATCH, 0, 0, nil},
+		{4, -1, -1, syscall.EINVAL},
+		{std.SCHED_IDLE, 0, 0, nil},
+		{std.SCHED_DEADLINE, 0, 0, nil},
+		{std.SCHED_EXT, 0, 0, nil},
+	}
+	for _, tc := range testCases {
+		name := tc.policy.String()
+		if tc.policy == std.SCHED_NORMAL {
+			name = "normal"
+		}
+
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			if priority, err := tc.policy.GetPriorityMax(); !reflect.DeepEqual(err, tc.err) {
+				t.Fatalf("GetPriorityMax: error = %v, want %v", err, tc.err)
+			} else if priority != tc.max {
+				t.Fatalf("GetPriorityMax: %d, want %d", priority, tc.max)
+			}
+			if priority, err := tc.policy.GetPriorityMin(); !reflect.DeepEqual(err, tc.err) {
+				t.Fatalf("GetPriorityMin: error = %v, want %v", err, tc.err)
+			} else if priority != tc.min {
+				t.Fatalf("GetPriorityMin: %d, want %d", priority, tc.min)
+			}
+		})
+	}
+}