Add strict mode API

See https://github.com/libbpf/libbpf/wiki/Libbpf-1.0-migration-guide for context.
Related to #159

libbpfgo.go

@@ -328,6 +328,41 @@ func NewModuleFromFile(bpfObjPath string) (*Module, error) {
 	})
 }
 
+// LibbpfStrictMode is an enum as defined in https://elixir.bootlin.com/linux/v5.17.5/source/tools/lib/bpf/libbpf_legacy.h#L23
+type LibbpfStrictMode uint32
+
+const (
+	LibbpfStrictModeAll               LibbpfStrictMode = C.LIBBPF_STRICT_ALL
+	LibbpfStrictModeNone              LibbpfStrictMode = C.LIBBPF_STRICT_NONE
+	LibbpfStrictModeCleanPtrs         LibbpfStrictMode = C.LIBBPF_STRICT_CLEAN_PTRS
+	LibbpfStrictModeDirectErrs        LibbpfStrictMode = C.LIBBPF_STRICT_DIRECT_ERRS
+	LibbpfStrictModeSecName           LibbpfStrictMode = C.LIBBPF_STRICT_SEC_NAME
+	LibbpfStrictModeNoObjectList      LibbpfStrictMode = C.LIBBPF_STRICT_NO_OBJECT_LIST
+	LibbpfStrictModeAutoRlimitMemlock LibbpfStrictMode = C.LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK
+)
+
+func (b LibbpfStrictMode) String() (str string) {
+	x := map[LibbpfStrictMode]string{
+		LibbpfStrictModeAll:               "LIBBPF_STRICT_ALL",
+		LibbpfStrictModeNone:              "LIBBPF_STRICT_NONE",
+		LibbpfStrictModeCleanPtrs:         "LIBBPF_STRICT_CLEAN_PTRS",
+		LibbpfStrictModeDirectErrs:        "LIBBPF_STRICT_DIRECT_ERRS",
+		LibbpfStrictModeSecName:           "LIBBPF_STRICT_SEC_NAME",
+		LibbpfStrictModeNoObjectList:      "LIBBPF_STRICT_NO_OBJECT_LIST",
+		LibbpfStrictModeAutoRlimitMemlock: "LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK",
+	}
+
+	str, ok := x[b]
+	if !ok {
+		str = LibbpfStrictModeNone.String()
+	}
+	return str
+}
+
+func SetStrictMode(mode LibbpfStrictMode) {
+	C.libbpf_set_strict_mode(uint32(mode))
+}
+
 func NewModuleFromFileArgs(args NewModuleArgs) (*Module, error) {
 	C.set_print_fn()
 	if err := bumpMemlockRlimit(); err != nil {
@@ -787,7 +822,7 @@ func (b *BPFMap) DeleteKeyBatch(keys unsafe.Pointer, count uint32) error {
 		ElemFlags: C.BPF_ANY,
 		Flags:     C.BPF_ANY,
 	}
-	
+
 	errC := C.bpf_map_delete_batch(b.fd, keys, &countC, bpfMapBatchOptsToC(opts))
 	if errC != 0 {
 		sc := syscall.Errno(-errC)