import (
	"bufio"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"syscall"
)

const (
	// Number of fields per line in /proc/mounts as per the fstab man page.
	expectedNumFieldsPerLine = 6
	// Location of the mount file to use
	procMountsPath = "/proc/mounts"
)

// IsLikelyMountPoint determines if a directory is a mountpoint.
func IsLikelyMountPoint(path string) bool {
	s1, err := os.Lstat(path)

	"github.com/prometheus/procfs"
)

// GetInterfaceNetStats - get procfs.NetDevLine by interfaceName
func GetInterfaceNetStats(interf string) (procfs.NetDevLine, error) {
	proc, err := procfs.Self()
	if err != nil {
		return procfs.NetDevLine{}, err
	}
	netDev, err := proc.NetDev()
	if err != nil {
		return procfs.NetDevLine{}, err
	}
	ndl, ok := netDev[interf]
	if !ok {

	result := make(map[string]string)

	mountInfo, err := os.Open("/proc/self/mountinfo")
	if err != nil {
		return nil, err
	}
	defer mountInfo.Close()

	scanner := bufio.NewScanner(mountInfo)
	for scanner.Scan() {
		s := strings.Split(scanner.Text(), " ")
		if len(s) != 11 {
			return nil, errors.New("unsupported /proc/self/mountinfo format")
		}
		result[s[2]] = s[9]
	}

package mountinfo

// mountInfo - This represents a single line in /proc/mounts.
type mountInfo struct {
	Device  string
	Path    string
	FSType  string
	Options []string
	Freq    string
	Pass    string
}

func (m mountInfo) String() string {
	return m.Path
}

// mountInfos - This represents the entire /proc/mounts.

		// hence not included in the collector path.
		pathComponents = pathComponents[:bucketIdx]
	}

	innerHandler := h.handle(pathComponents, isListingRequest, buckets)

	// Add tracing to the prom. handler
	tracedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)
		if ok {
			tc.FuncName = "handler.MetricsV3"

	// Success case, where path doesn't have any mounts.
	{
		if err = mounts.checkCrossMounts("/path/to/x"); err != nil {
			t.Fatalf("Expected success, failed instead (%s)", err)
		}
	}
}

// Tests read proc mounts file.
func TestReadProcmountInfos(t *testing.T) {
	successCase := `/dev/0 /path/to/0 type0 flags 0 0
		/dev/1    /path/to/1   type1	flags 1 1
		/dev/2 /path/to/2 type2 flags,1,2=3 2 2
		`
	var err error

	processIOReadBytesMD              = NewCounterMD(processIOReadBytes, "Total bytes read by the process from the underlying storage system, /proc/[pid]/io read_bytes")
	processIOWCharBytesMD             = NewCounterMD(processIOWCharBytes, "Total bytes written by the process to the underlying storage system including page cache, /proc/[pid]/io wchar")

				// Number of probes.
				// ~ cat /proc/sys/net/ipv4/tcp_keepalive_probes (defaults to 9, we reduce it to 5)
				_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, 5)

				// Wait time after successful probe in seconds.
				// ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 15 secs)