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package fuse
import (
"path/filepath"
"syscall"
"unsafe"
)
type pollFd struct {
Fd int32
Events int16
Revents int16
}
func sysPoll(fds []pollFd, timeout int) (n int, err error) {
r0, _, e1 := syscall.Syscall(syscall.SYS_POLL, uintptr(unsafe.Pointer(&fds[0])),
uintptr(len(fds)), uintptr(timeout))
n = int(r0)
if e1 != 0 {
err = syscall.Errno(e1)
}
return n, err
}
func pollHack(mountPoint string) error {
const (
POLLIN = 0x1
POLLPRI = 0x2
POLLOUT = 0x4
POLLRDHUP = 0x2000
POLLERR = 0x8
POLLHUP = 0x10
)
fd, err := syscall.Open(filepath.Join(mountPoint, pollHackName), syscall.O_RDONLY, 0)
if err != nil {
return err
}
pollData := []pollFd{{
Fd: int32(fd),
Events: POLLIN | POLLPRI | POLLOUT,
}}
// Trigger _OP_POLL, so we can say ENOSYS. We don't care about
// the return value.
sysPoll(pollData, 0)
syscall.Close(fd)
return nil
}
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