Use SysReadFile for thermals and skip failed zones

internal/util/sysreadfile.go

@@ -20,6 +20,8 @@ package util
 import (
 	"bytes"
 	"os"
+	"strconv"
+	"strings"
 	"syscall"
 )
 
@@ -48,3 +50,21 @@ func SysReadFile(file string) (string, error) {
 
 	return string(bytes.TrimSpace(b[:n])), nil
 }
+
+// SysReadUintFromFile reads a file using SysReadFile and attempts to parse a uint64 from it.
+func SysReadUintFromFile(path string) (uint64, error) {
+	data, err := SysReadFile(path)
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseUint(strings.TrimSpace(string(data)), 10, 64)
+}
+
+// SysReadIntFromFile reads a file using SysReadFile and attempts to parse a int64 from it.
+func SysReadIntFromFile(path string) (int64, error) {
+	data, err := SysReadFile(path)
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseInt(strings.TrimSpace(string(data)), 10, 64)
+}

sysfs/class_thermal.go

@@ -51,7 +51,7 @@ func (fs FS) ClassThermalZoneStats() ([]ClassThermalZoneStats, error) {
 	for _, zone := range zones {
 		zoneStats, err := parseClassThermalZone(zone)
 		if err != nil {
-			if errors.Is(err, syscall.ENODATA) || errors.As(err, new(*fsp.PathError)) {
+			if errors.Is(err, syscall.ENODATA) || errors.As(err, new(*fsp.PathError)) || errors.Is(err, syscall.EAGAIN) {
 				continue
 			}
 			return nil, err
@@ -72,7 +72,7 @@ func parseClassThermalZone(zone string) (ClassThermalZoneStats, error) {
 	if err != nil {
 		return ClassThermalZoneStats{}, err
 	}
-	zoneTemp, err := util.ReadIntFromFile(filepath.Join(zone, "temp"))
+	zoneTemp, err := util.SysReadIntFromFile(filepath.Join(zone, "temp"))
 	if err != nil {
 		return ClassThermalZoneStats{}, err
 	}
@@ -85,7 +85,7 @@ func parseClassThermalZone(zone string) (ClassThermalZoneStats, error) {
 	zoneMode := util.ParseBool(mode)
 
 	var zonePassive *uint64
-	passive, err := util.ReadUintFromFile(filepath.Join(zone, "passive"))
+	passive, err := util.SysReadUintFromFile(filepath.Join(zone, "passive"))
 	if os.IsNotExist(err) || os.IsPermission(err) {
 		zonePassive = nil
 	} else if err != nil {