1 // Copyright 2018 The Prometheus Authors 2 // Licensed under the Apache License, Version 2.0 (the "License"); 3 // you may not use this file except in compliance with the License. 4 // You may obtain a copy of the License at 5 // 6 // http://www.apache.org/licenses/LICENSE-2.0 7 // 8 // Unless required by applicable law or agreed to in writing, software 9 // distributed under the License is distributed on an "AS IS" BASIS, 10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 // See the License for the specific language governing permissions and 12 // limitations under the License. 13 14 //go:build freebsd || linux 15 // +build freebsd linux 16 17 package procfs 18 19 import ( 20 "syscall" 21 ) 22 23 // isRealProc determines whether supplied mountpoint is really a proc filesystem. 24 func isRealProc(mountPoint string) (bool, error) { 25 stat := syscall.Statfs_t{} 26 err := syscall.Statfs(mountPoint, &stat) 27 if err != nil { 28 return false, err 29 } 30 31 // 0x9fa0 is PROC_SUPER_MAGIC: https://elixir.bootlin.com/linux/v6.1/source/include/uapi/linux/magic.h#L87 32 return stat.Type == 0x9fa0, nil 33 } 34