common

Documentation

Index

• Constants
• func C2GoArray(str string) []byte
• func GetNumPossibleCPUs(log logrus.FieldLogger) int
• func GoArray2C(array []byte) string
• func GoArray2CNoSpaces(array []byte) string
• func MapStringStructToSlice(m map[string]struct{}) []string
• func RequireRootPrivilege(cmd string)

Constants

const (

	// CHeaderFileName is the name of the C header file for BPF programs for a
	// particular endpoint.
	CHeaderFileName = "ep_config.h"

	// PossibleCPUSysfsPath is used to retrieve the number of CPUs for per-CPU maps.
	PossibleCPUSysfsPath = "/sys/devices/system/cpu/possible"
)

Functions

func C2GoArray

func C2GoArray(str string) []byte

C2GoArray transforms an hexadecimal string representation into a byte slice. Example: str := "0x12, 0xff, 0x0, 0x1" fmt.Print(C2GoArray(str)) //`{0x12, 0xFF, 0x0, 0x01}`"

func GetNumPossibleCPUs

func GetNumPossibleCPUs(log logrus.FieldLogger) int

GetNumPossibleCPUs returns a total number of possible CPUS, i.e. CPUs that have been allocated resources and can be brought online if they are present. The number is retrieved by parsing /sys/devices/system/cpu/possible.

See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/cpumask.h?h=v4.19#n50 for more details.

func GoArray2C

func GoArray2C(array []byte) string

GoArray2C transforms a byte slice into its hexadecimal string representation. Example: array := []byte{0x12, 0xFF, 0x0, 0x01} fmt.Print(GoArray2C(array)) // "{ 0x12, 0xff, 0x0, 0x1 }"

func GoArray2CNoSpaces

func GoArray2CNoSpaces(array []byte) string

GoArray2CNoSpaces does the same as GoArray2C, but no spaces are used in the final output. Example: array := []byte{0x12, 0xFF, 0x0, 0x01} fmt.Print(GoArray2CNoSpaces(array)) // "{0x12,0xff,0x0,0x1}"

func MapStringStructToSlice

func MapStringStructToSlice(m map[string]struct{}) []string

MapStringStructToSlice returns a slice with all keys of the given map[string]struct{}

func RequireRootPrivilege

func RequireRootPrivilege(cmd string)

RequireRootPrivilege checks if the user running cmd is root. If not, it exits the program