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