[chore]: Bump github.com/KimMachineGun/automemlimit from 0.4.0 to 0.5.0 (#2560)

vendor/github.com/pbnjay/memory/memory_darwin.go

@@ -0,0 +1,49 @@
+// +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
+}