Method handleGetsockopt

cmd/run/engine/process/handle.go:460–486

handleGetsockopt handles the getsockopt(2) syscall to emulate SO_ERROR.

(n *seccomp.Notif, fd int, level int, name int, valPtr uintptr, valSizePtr uintptr)

// handleGetsockopt handles the getsockopt(2) syscall to emulate SO_ERROR.
func (p *Process) handleGetsockopt(n *seccomp.Notif, fd int, level int, name int, valPtr uintptr, valSizePtr uintptr) error {
	if level != unix.SOL_SOCKET || name != unix.SO_ERROR {
		return n.Skip()
	}

	s, ok := p.getSocket(fd)
	if !ok {
		return n.Skip()
	}

	valSize, errno, err := p.vmReadUint32(n, valSizePtr)
	if err != nil {
		return fmt.Errorf("read value size pointer: %w", err)
	}
	if errno != 0 {
		return n.Return(0, errno)
	}
	if valSize != 4 {
		return n.Return(0, unix.EINVAL)
	}

	errno, err = p.vmWriteUint32(n, valPtr, uint32(s.Errno()))
	if err != nil {
		return fmt.Errorf("write value: %w", err)
	}
	return n.Return(0, errno)
}

// handleSetsockopt handles the setsockopt(2) syscall to allow ignoring
// TCP_DEFER_ACCEPT.