khenaidoo | 2672188 | 2021-08-11 17:42:52 -0400 | [diff] [blame] | 1 | // Copyright 2015 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | // Package runtime implements utility functions for runtime systems. |
| 16 | package runtime |
| 17 | |
| 18 | import ( |
| 19 | "os" |
| 20 | "syscall" |
| 21 | ) |
| 22 | |
| 23 | func FDLimit() (uint64, error) { |
| 24 | var rlimit syscall.Rlimit |
| 25 | if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlimit); err != nil { |
| 26 | return 0, err |
| 27 | } |
| 28 | return rlimit.Cur, nil |
| 29 | } |
| 30 | |
| 31 | func FDUsage() (uint64, error) { |
| 32 | return countFiles("/proc/self/fd") |
| 33 | } |
| 34 | |
| 35 | // countFiles reads the directory named by dirname and returns the count. |
| 36 | // This is same as stdlib "io/ioutil.ReadDir" but without sorting. |
| 37 | func countFiles(dirname string) (uint64, error) { |
| 38 | f, err := os.Open(dirname) |
| 39 | if err != nil { |
| 40 | return 0, err |
| 41 | } |
| 42 | list, err := f.Readdir(-1) |
| 43 | f.Close() |
| 44 | if err != nil { |
| 45 | return 0, err |
| 46 | } |
| 47 | return uint64(len(list)), nil |
| 48 | } |