github.com/inspektor-gadget/inspektor-gadget@v0.28.1/pkg/operators/ebpf/maps.go (about)

     1  // Copyright 2024 The Inspektor Gadget authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ebpfoperator
    16  
    17  import (
    18  	"reflect"
    19  
    20  	"github.com/cilium/ebpf"
    21  	"github.com/cilium/ebpf/btf"
    22  )
    23  
    24  func (i *ebpfInstance) populateMap(t btf.Type, varName string) error {
    25  	i.logger.Debugf("populating map %q", varName)
    26  
    27  	newVar := &ebpfVar{
    28  		name:    varName,
    29  		refType: reflect.TypeOf(&ebpf.Map{}),
    30  		tags:    nil,
    31  	}
    32  
    33  	i.vars[varName] = newVar
    34  
    35  	// Set variable to nil pointer to map, so it's present
    36  	var nilVal *ebpf.Map
    37  	i.gadgetCtx.SetVar(varName, nilVal)
    38  	return nil
    39  }