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gotosocial/vendor/github.com/cilium/ebpf/internal/sys/syscall.go

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package sys
import (
"runtime"
"syscall"
"unsafe"
"github.com/cilium/ebpf/internal/unix"
)
// BPF wraps SYS_BPF.
//
// Any pointers contained in attr must use the Pointer type from this package.
func BPF(cmd Cmd, attr unsafe.Pointer, size uintptr) (uintptr, error) {
for {
r1, _, errNo := unix.Syscall(unix.SYS_BPF, uintptr(cmd), uintptr(attr), size)
runtime.KeepAlive(attr)
// As of ~4.20 the verifier can be interrupted by a signal,
// and returns EAGAIN in that case.
if errNo == unix.EAGAIN && cmd == BPF_PROG_LOAD {
continue
}
var err error
if errNo != 0 {
err = wrappedErrno{errNo}
}
return r1, err
}
}
// Info is implemented by all structs that can be passed to the ObjInfo syscall.
//
// MapInfo
// ProgInfo
// LinkInfo
// BtfInfo
type Info interface {
info() (unsafe.Pointer, uint32)
}
var _ Info = (*MapInfo)(nil)
func (i *MapInfo) info() (unsafe.Pointer, uint32) {
return unsafe.Pointer(i), uint32(unsafe.Sizeof(*i))
}
var _ Info = (*ProgInfo)(nil)
func (i *ProgInfo) info() (unsafe.Pointer, uint32) {
return unsafe.Pointer(i), uint32(unsafe.Sizeof(*i))
}
var _ Info = (*LinkInfo)(nil)
func (i *LinkInfo) info() (unsafe.Pointer, uint32) {
return unsafe.Pointer(i), uint32(unsafe.Sizeof(*i))
}
var _ Info = (*BtfInfo)(nil)
func (i *BtfInfo) info() (unsafe.Pointer, uint32) {
return unsafe.Pointer(i), uint32(unsafe.Sizeof(*i))
}
// ObjInfo retrieves information about a BPF Fd.
//
// info may be one of MapInfo, ProgInfo, LinkInfo and BtfInfo.
func ObjInfo(fd *FD, info Info) error {
ptr, len := info.info()
err := ObjGetInfoByFd(&ObjGetInfoByFdAttr{
BpfFd: fd.Uint(),
InfoLen: len,
Info: NewPointer(ptr),
})
runtime.KeepAlive(fd)
return err
}
// BPFObjName is a null-terminated string made up of
// 'A-Za-z0-9_' characters.
type ObjName [unix.BPF_OBJ_NAME_LEN]byte
// NewObjName truncates the result if it is too long.
func NewObjName(name string) ObjName {
var result ObjName
copy(result[:unix.BPF_OBJ_NAME_LEN-1], name)
return result
}
// LinkID uniquely identifies a bpf_link.
type LinkID uint32
// BTFID uniquely identifies a BTF blob loaded into the kernel.
type BTFID uint32
// wrappedErrno wraps syscall.Errno to prevent direct comparisons with
// syscall.E* or unix.E* constants.
//
// You should never export an error of this type.
type wrappedErrno struct {
syscall.Errno
}
func (we wrappedErrno) Unwrap() error {
return we.Errno
}
type syscallError struct {
error
errno syscall.Errno
}
func Error(err error, errno syscall.Errno) error {
return &syscallError{err, errno}
}
func (se *syscallError) Is(target error) bool {
return target == se.error
}
func (se *syscallError) Unwrap() error {
return se.errno
}