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limits_linux.go
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limits_linux.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package xos
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
"syscall"
)
const (
sysctlDir = "/proc/sys/"
vmMaxMapCountKey = "vm.max_map_count"
vmSwappinessKey = "vm.swappiness"
)
// CanGetProcessLimits returns a boolean to signify if it can return limits,
// and a warning message if it cannot.
func CanGetProcessLimits() (bool, string) {
return true, ""
}
// GetProcessLimits returns the known process limits.
func GetProcessLimits() (ProcessLimits, error) {
var noFile syscall.Rlimit
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &noFile)
if err != nil {
return ProcessLimits{}, err
}
maxMap, err := sysctlInt64(vmMaxMapCountKey)
if err != nil {
return ProcessLimits{}, err
}
swap, err := sysctlInt64(vmSwappinessKey)
if err != nil {
return ProcessLimits{}, err
}
return ProcessLimits{
NoFileCurr: noFile.Cur,
NoFileMax: noFile.Max,
VMMaxMapCount: maxMap,
VMSwappiness: swap,
}, nil
}
func sysctlInt64(key string) (int64, error) {
str, err := sysctl(key)
if err != nil {
return 0, err
}
num, err := strconv.Atoi(str)
if err != nil {
return 0, err
}
return int64(num), nil
}
func sysctl(key string) (string, error) {
path := sysctlDir + strings.Replace(key, ".", "/", -1)
data, err := ioutil.ReadFile(path)
if err != nil {
return "", fmt.Errorf("could not find the given sysctl file: %v, err: %v", path, err)
}
return strings.TrimSpace(string(data)), nil
}