restic/internal/fs/setflags_linux.go

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package fs
import (
"os"
"golang.org/x/sys/unix"
)
// SetFlags tries to set the O_NOATIME flag on f, which prevents the kernel
// from updating the atime on a read call.
//
// The call fails when we're not the owner of the file or root. The caller
// should ignore the error, which is returned for testing only.
func setFlags(f *os.File) error {
fd := f.Fd()
flags, err := unix.FcntlInt(fd, unix.F_GETFL, 0)
if err == nil {
_, err = unix.FcntlInt(fd, unix.F_SETFL, flags|unix.O_NOATIME)
}
return err
}