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//go:build !windows && !appengine && !plan9 && !js && !wasip1 && !wasi
package maxminddb
import (
"errors"
"os"
"golang.org/x/sys/unix"
)
type mmapENODEVError struct{}
func (mmapENODEVError) Error() string {
return "mmap: the underlying filesystem of the specified file does not support memory mapping"
}
func (mmapENODEVError) Is(target error) bool {
return target == errors.ErrUnsupported
}
func mmap(fd, length int) (data []byte, err error) {
data, err = unix.Mmap(fd, 0, length, unix.PROT_READ, unix.MAP_SHARED)
if err != nil {
if err == unix.ENODEV {
return nil, mmapENODEVError{}
}
return nil, os.NewSyscallError("mmap", err)
}
return data, nil
}
func munmap(b []byte) (err error) {
if err = unix.Munmap(b); err != nil {
return os.NewSyscallError("munmap", err)
}
return nil
}
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