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map: include errnos with errors
We replace some errnos from map syscalls with more descriptive
sentinel errors. Include the original errno with the error so
that both
errors.Is(err, ErrKeyNotExist)
errors.Is(err, unix.ENOENT)
work. We'll use this for other errors in the future where we
want to introduce our own errors without breaking callers that
rely on the (coarser) errno semantics.
link: return os.ErrNotExist when symbol doesn't exist
Some of the tracing related links currently return ErrNotSupported
when trying to attach to a non-existant symbol. This is misleading.
Consistently return os.ErrNotExist in such cases.
btf: avoid Type copy in FuncProto.walk
FuncProto.walk currently takes a copy of FuncParam.Type since the
for loop implicitly makes a copy of the FuncParam value:
for _, m := range fp.Params {
m is a copy of the original param, so &m.Type is the address of a
temporary variable. Instead, iterate params using the index and
take the correct address. Also extend the tests to cover this case.