| // Copyright 2019 Google Inc. All rights reserved. |
| // |
| // 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. |
| |
| package build |
| |
| import ( |
| "encoding/binary" |
| "syscall" |
| ) |
| |
| func detectTotalRAM(ctx Context) uint64 { |
| s, err := syscall.Sysctl("hw.memsize") |
| if err != nil { |
| ctx.Printf("Failed to get system memory size: %v", err) |
| return 0 |
| } |
| |
| // syscall.Sysctl assumes that the return value is a string and trims the last byte if it is 0. |
| if len(s) == 7 { |
| s += "\x00" |
| } |
| |
| if len(s) != 8 { |
| ctx.Printf("Failed to get system memory size, returned %d bytes, expecting 8 bytes", len(s)) |
| return 0 |
| } |
| |
| return binary.LittleEndian.Uint64([]byte(s)) |
| } |