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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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