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- // 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))
- }
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