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|-
|-
| 6
| 6
| Input fds struct ptr
| Pointer to input pollfd struct array
|}
|}
|-
|-
| 1
| 1
| Output fds struct ptr
| Pointer to output pollfd struct array
|}
|}
| 2
| 2
| POSIX return value
| POSIX return value
|}
=pollfd struct=
{| class="wikitable" border="1"
|-
! Type
! Name
! Description
|-
| u32
| fd
| Socket handle
|-
| u32
| events
| Events to poll for (input)
|-
| u32
| revents
| Events received (output)
|}
=Events=
Events are a bitwise set of these flags.
{| class="wikitable" border="1"
|-
! Value
! Name
! Input/Output
! Description
|-
| 0x01
| POLLIN
| Both
| Can recv() data from socket without blocking. For listen sockets, this means you can accept() a connection without blocking.
|-
| 0x02
| POLLPRI
| Both
| There is OOB data ready to recv(). Appears that recv()'ing without OOB flag still reads OOB data?
|-
| 0x04
| ???
| ???
| Have never seen this flag. Could possibly be POLLHUP (need to test).
|-
| 0x08
| ???
| ???
| This flag is almost always set when requested.
|-
| 0x10
| POLLOUT
| Both
| Can send() data to socket without blocking. For a non-blocking connect(), this means the connection has completed (need to test).
|-
| 0x20
| POLLNVAL
| Out
| Invalid socket handle. This is set if you use fd=-1, which is non-standard behavior.
|-
| ???
| POLLERR
| Out
| Socket error.
|-
| ???
| POLLHUP
| Out
| Socket has been disconnected.
|}
|}