| Dan Willemsen | 2bb82d0 | 2019-12-27 09:35:42 -0800 | [diff] [blame^] | 1 | // Copyright 2019 Google Inc. All rights reserved. |
| 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 build |
| 16 | |
| 17 | import ( |
| 18 | "encoding/binary" |
| 19 | "syscall" |
| 20 | ) |
| 21 | |
| 22 | func detectTotalRAM(ctx Context) uint64 { |
| 23 | s, err := syscall.Sysctl("hw.memsize") |
| 24 | if err != nil { |
| 25 | ctx.Printf("Failed to get system memory size: %s") |
| 26 | return 0 |
| 27 | } |
| 28 | |
| 29 | // syscall.Sysctl assumes that the return value is a string and trims the last byte if it is 0. |
| 30 | if len(s) == 7 { |
| 31 | s += "\x00" |
| 32 | } |
| 33 | |
| 34 | if len(s) != 8 { |
| 35 | ctx.Printf("Failed to get system memory size, returned %d bytes, 8", len(s)) |
| 36 | return 0 |
| 37 | } |
| 38 | |
| 39 | return binary.LittleEndian.Uint64([]byte(s)) |
| 40 | } |