config_darwin.go 1.1 KB

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  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. package build
  15. import (
  16. "encoding/binary"
  17. "syscall"
  18. )
  19. func detectTotalRAM(ctx Context) uint64 {
  20. s, err := syscall.Sysctl("hw.memsize")
  21. if err != nil {
  22. ctx.Printf("Failed to get system memory size: %v", err)
  23. return 0
  24. }
  25. // syscall.Sysctl assumes that the return value is a string and trims the last byte if it is 0.
  26. if len(s) == 7 {
  27. s += "\x00"
  28. }
  29. if len(s) != 8 {
  30. ctx.Printf("Failed to get system memory size, returned %d bytes, expecting 8 bytes", len(s))
  31. return 0
  32. }
  33. return binary.LittleEndian.Uint64([]byte(s))
  34. }