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49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
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package btf
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import (
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"bytes"
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"github.com/cilium/ebpf/internal"
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)
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// info describes a BTF object.
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type info struct {
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BTF *Spec
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ID ID
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// Name is an identifying name for the BTF, currently only used by the
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// kernel.
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Name string
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// KernelBTF is true if the BTf originated with the kernel and not
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// userspace.
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KernelBTF bool
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}
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func newInfoFromFd(fd *internal.FD) (*info, error) {
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// We invoke the syscall once with a empty BTF and name buffers to get size
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// information to allocate buffers. Then we invoke it a second time with
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// buffers to receive the data.
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bpfInfo, err := bpfGetBTFInfoByFD(fd, nil, nil)
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if err != nil {
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return nil, err
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}
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btfBuffer := make([]byte, bpfInfo.btfSize)
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nameBuffer := make([]byte, bpfInfo.nameLen)
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bpfInfo, err = bpfGetBTFInfoByFD(fd, btfBuffer, nameBuffer)
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if err != nil {
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return nil, err
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}
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spec, err := loadRawSpec(bytes.NewReader(btfBuffer), internal.NativeEndian, nil, nil)
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if err != nil {
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return nil, err
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}
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return &info{
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BTF: spec,
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ID: ID(bpfInfo.id),
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Name: internal.CString(nameBuffer),
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KernelBTF: bpfInfo.kernelBTF != 0,
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}, nil
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}
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