mirror of
https://github.com/superseriousbusiness/gotosocial.git
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57dc742c76
Bumps [github.com/KimMachineGun/automemlimit](https://github.com/KimMachineGun/automemlimit) from 0.2.4 to 0.2.5. - [Release notes](https://github.com/KimMachineGun/automemlimit/releases) - [Commits](https://github.com/KimMachineGun/automemlimit/compare/v0.2.4...v0.2.5) --- updated-dependencies: - dependency-name: github.com/KimMachineGun/automemlimit dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
122 lines
3.0 KiB
Go
122 lines
3.0 KiB
Go
package btf
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import (
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"errors"
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"fmt"
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"os"
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"github.com/cilium/ebpf/internal/sys"
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"github.com/cilium/ebpf/internal/unix"
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)
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// HandleInfo describes a Handle.
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type HandleInfo struct {
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// ID of this handle in the kernel. The ID is only valid as long as the
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// associated handle is kept alive.
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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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// IsKernel is true if the BTF originated with the kernel and not
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// userspace.
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IsKernel bool
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// Size of the raw BTF in bytes.
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size uint32
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}
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func newHandleInfoFromFD(fd *sys.FD) (*HandleInfo, 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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var btfInfo sys.BtfInfo
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if err := sys.ObjInfo(fd, &btfInfo); err != nil {
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return nil, fmt.Errorf("get BTF info for fd %s: %w", fd, err)
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}
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if btfInfo.NameLen > 0 {
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// NameLen doesn't account for the terminating NUL.
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btfInfo.NameLen++
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}
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// Don't pull raw BTF by default, since it may be quite large.
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btfSize := btfInfo.BtfSize
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btfInfo.BtfSize = 0
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nameBuffer := make([]byte, btfInfo.NameLen)
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btfInfo.Name, btfInfo.NameLen = sys.NewSlicePointerLen(nameBuffer)
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if err := sys.ObjInfo(fd, &btfInfo); err != nil {
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return nil, err
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}
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return &HandleInfo{
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ID: ID(btfInfo.Id),
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Name: unix.ByteSliceToString(nameBuffer),
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IsKernel: btfInfo.KernelBtf != 0,
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size: btfSize,
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}, nil
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}
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// IsModule returns true if the BTF is for the kernel itself.
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func (i *HandleInfo) IsVmlinux() bool {
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return i.IsKernel && i.Name == "vmlinux"
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}
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// IsModule returns true if the BTF is for a kernel module.
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func (i *HandleInfo) IsModule() bool {
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return i.IsKernel && i.Name != "vmlinux"
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}
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// HandleIterator allows enumerating BTF blobs loaded into the kernel.
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type HandleIterator struct {
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// The ID of the last retrieved handle. Only valid after a call to Next.
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ID ID
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err error
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}
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// Next retrieves a handle for the next BTF blob.
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//
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// [Handle.Close] is called if *handle is non-nil to avoid leaking fds.
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//
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// Returns true if another BTF blob was found. Call [HandleIterator.Err] after
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// the function returns false.
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func (it *HandleIterator) Next(handle **Handle) bool {
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if *handle != nil {
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(*handle).Close()
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*handle = nil
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}
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id := it.ID
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for {
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attr := &sys.BtfGetNextIdAttr{Id: id}
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err := sys.BtfGetNextId(attr)
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if errors.Is(err, os.ErrNotExist) {
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// There are no more BTF objects.
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return false
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} else if err != nil {
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it.err = fmt.Errorf("get next BTF ID: %w", err)
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return false
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}
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id = attr.NextId
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*handle, err = NewHandleFromID(id)
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if errors.Is(err, os.ErrNotExist) {
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// Try again with the next ID.
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continue
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} else if err != nil {
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it.err = fmt.Errorf("retrieve handle for ID %d: %w", id, err)
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return false
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}
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it.ID = id
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return true
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}
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}
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// Err returns an error if iteration failed for some reason.
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func (it *HandleIterator) Err() error {
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return it.err
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}
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