tidb sys_linux 源码
tidb sys_linux 代码
文件路径：/util/sys/linux/sys_linux.go
// Copyright 2019 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build linux
package linux
import (
"net"
"syscall"
"golang.org/x/sys/unix"
)
// OSVersion returns version info of operation system.
// e.g. Linux 4.15.0-45-generic.x86_64
func OSVersion() (osVersion string, err error) {
var un syscall.Utsname
err = syscall.Uname(&un)
if err != nil {
return
}
charsToString := func(ca []int8) string {
s := make([]byte, len(ca))
var lens int
for ; lens < len(ca); lens++ {
if ca[lens] == 0 {
break
}
s[lens] = uint8(ca[lens])
}
return string(s[0:lens])
}
osVersion = charsToString(un.Sysname[:]) + " " + charsToString(un.Release[:]) + "." + charsToString(un.Machine[:])
return
}
// SetAffinity sets cpu affinity.
func SetAffinity(cpus []int) error {
var cpuSet unix.CPUSet
cpuSet.Zero()
for _, c := range cpus {
cpuSet.Set(c)
}
return unix.SchedSetaffinity(unix.Getpid(), &cpuSet)
}
// GetSockUID gets the uid of the other end of the UNIX domain socket
func GetSockUID(uc net.UnixConn) (uid uint32, err error) {
raw, err := uc.SyscallConn()
if err != nil {
return 0, err
}
var cred *unix.Ucred
err = raw.Control(func(fd uintptr) {
cred, err = unix.GetsockoptUcred(int(fd),
unix.SOL_SOCKET,
unix.SO_PEERCRED)
})
if err != nil {
return 0, err
}
return cred.Uid, nil
}
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