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// +build linux
package fscommon
import (
"errors"
"fmt"
"math"
"strconv"
"strings"
)
var (
ErrNotValidFormat = errors.New("line is not a valid key value format")
)
// ParseUint converts a string to an uint64 integer.
// Negative values are returned at zero as, due to kernel bugs,
// some of the memory cgroup stats can be negative.
func ParseUint(s string, base, bitSize int) (uint64, error) {
value, err := strconv.ParseUint(s, base, bitSize)
if err != nil {
intValue, intErr := strconv.ParseInt(s, base, bitSize)
// 1. Handle negative values greater than MinInt64 (and)
// 2. Handle negative values lesser than MinInt64
if intErr == nil && intValue < 0 {
return 0, nil
} else if intErr != nil && intErr.(*strconv.NumError).Err == strconv.ErrRange && intValue < 0 {
return 0, nil
}
return value, err
}
return value, nil
}
// GetCgroupParamKeyValue parses a space-separated "name value" kind of cgroup
// parameter and returns its components. For example, "io_service_bytes 1234"
// will return as "io_service_bytes", 1234.
func GetCgroupParamKeyValue(t string) (string, uint64, error) {
parts := strings.Fields(t)
switch len(parts) {
case 2:
value, err := ParseUint(parts[1], 10, 64)
if err != nil {
return "", 0, fmt.Errorf("unable to convert to uint64: %v", err)
}
return parts[0], value, nil
default:
return "", 0, ErrNotValidFormat
}
}
// GetCgroupParamUint reads a single uint64 value from the specified cgroup file.
// If the value read is "max", the math.MaxUint64 is returned.
func GetCgroupParamUint(path, file string) (uint64, error) {
contents, err := GetCgroupParamString(path, file)
if err != nil {
return 0, err
}
contents = strings.TrimSpace(contents)
if contents == "max" {
return math.MaxUint64, nil
}
res, err := ParseUint(contents, 10, 64)
if err != nil {
return res, fmt.Errorf("unable to parse file %q", path+"/"+file)
}
return res, nil
}
// GetCgroupParamInt reads a single int64 value from specified cgroup file.
// If the value read is "max", the math.MaxInt64 is returned.
func GetCgroupParamInt(path, file string) (int64, error) {
contents, err := ReadFile(path, file)
if err != nil {
return 0, err
}
contents = strings.TrimSpace(contents)
if contents == "max" {
return math.MaxInt64, nil
}
res, err := strconv.ParseInt(contents, 10, 64)
if err != nil {
return res, fmt.Errorf("unable to parse %q as a int from Cgroup file %q", contents, path+"/"+file)
}
return res, nil
}
// GetCgroupParamString reads a string from the specified cgroup file.
func GetCgroupParamString(path, file string) (string, error) {
contents, err := ReadFile(path, file)
if err != nil {
return "", err
}
return strings.TrimSpace(contents), nil
}
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