50 lines
1016 B
Go
50 lines
1016 B
Go
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// +build darwin
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package memory
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import (
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"os/exec"
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"regexp"
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"strconv"
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)
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func sysTotalMemory() uint64 {
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s, err := sysctlUint64("hw.memsize")
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if err != nil {
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return 0
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}
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return s
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}
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func sysFreeMemory() uint64 {
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cmd := exec.Command("vm_stat")
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outBytes, err := cmd.Output()
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if err != nil {
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return 0
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}
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rePageSize := regexp.MustCompile("page size of ([0-9]*) bytes")
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reFreePages := regexp.MustCompile("Pages free: *([0-9]*)\\.")
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// default: page size of 4096 bytes
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matches := rePageSize.FindSubmatchIndex(outBytes)
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pageSize := uint64(4096)
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if len(matches) == 4 {
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pageSize, err = strconv.ParseUint(string(outBytes[matches[2]:matches[3]]), 10, 64)
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if err != nil {
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return 0
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}
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}
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// ex: Pages free: 1126961.
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matches = reFreePages.FindSubmatchIndex(outBytes)
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freePages := uint64(0)
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if len(matches) == 4 {
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freePages, err = strconv.ParseUint(string(outBytes[matches[2]:matches[3]]), 10, 64)
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if err != nil {
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return 0
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}
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}
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return freePages * pageSize
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}
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