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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package sysinfo
import (
"bufio"
"errors"
"io"
"regexp"
"strconv"
)
// BytesToMebibytes converts bytes into mebibytes.
func BytesToMebibytes(bts uint64) uint64 {
return bts / ((uint64)(1024 * 1024))
}
var (
meminfoRe = regexp.MustCompile(`^MemTotal:\s+([0-9]+)\s+[kK]B$`)
errMemTotalNotFound = errors.New("supported MemTotal not found in /proc/meminfo")
)
// parseProcMeminfo is used to parse Linux's "/proc/meminfo". It is located
// here so that the relevant cross agent tests will be run on all platforms.
func parseProcMeminfo(f io.Reader) (uint64, error) {
scanner := bufio.NewScanner(f)
for scanner.Scan() {
if m := meminfoRe.FindSubmatch(scanner.Bytes()); m != nil {
kb, err := strconv.ParseUint(string(m[1]), 10, 64)
if err != nil {
return 0, err
}
return kb * 1024, nil
}
}
err := scanner.Err()
if err == nil {
err = errMemTotalNotFound
}
return 0, err
}
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