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//go:build linux || darwin
package tpmutil
import (
"fmt"
"os"
"golang.org/x/sys/unix"
)
// poll blocks until the file descriptor is ready for reading or an error occurs.
func poll(f *os.File) error {
var (
fds = []unix.PollFd{{
Fd: int32(f.Fd()),
Events: 0x1, // POLLIN
}}
timeout = -1 // Indefinite timeout
)
if _, err := unix.Poll(fds, timeout); err != nil {
return err
}
// Revents is filled in by the kernel.
// If the expected event happened, Revents should match Events.
if fds[0].Revents != fds[0].Events {
return fmt.Errorf("unexpected poll Revents 0x%x", fds[0].Revents)
}
return nil
}
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