| Member Name | Description |
|---|
| POLLERR | An exceptional condition has occurred on the device or socket. This flag is always checked, even if not present in the Pollfd.events bitmask.
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| POLLHUP | The device or socket has been disconnected. This flag is always checked, even if not present in the Pollfd.events bitmask. Note that POLLHUP and POLLOUT should never be present in the Pollfd.revents bitmask at the same time.
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| POLLIN | Data other than high priority data may be read without blocking.
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| POLLNVAL | The file descriptor is not open. This flag is always checked, even if not present in the Pollfd.events bitmask.
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| POLLOUT |
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| POLLPRI | High priority data may be read without blocking.
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| POLLRDBAND | Data with a non-zero priority may be read without blocking.
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| POLLRDNORM | Normal data may be written without blocking.
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| POLLWRBAND | Data with a non-zero priority may be written without blocking
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| POLLWRNORM | Normal data may be written without blocking.
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