doc: properly label enumerations and types (#4506)

doc: add uv_poll_cb status==UV_EBADF note (#3797)

doc,poll: add notes (repeated cb & cancel pending cb)

Added notes to documentation of `uv_poll_t`:
- The callback will be called over-and-over again as long as the socket
remains rea

doc,poll: add notes (repeated cb & cancel pending cb)

Added notes to documentation of `uv_poll_t`:
- The callback will be called over-and-over again as long as the socket
remains readable/writable.
- uv_poll_stop() cancels pending callbacks of already happened events.

Fixes: https://github.com/libuv/libuv/issues/1078
PR-URL: https://github.com/libuv/libuv/pull/1100
Co-authored-by: Jameson Nash <vtjnash@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

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poll: add support for OOB TCP and GPIO interrupts

Out-of-band TCP messages are used for TCP data
transmission outside (outband) the inbound TCP
data. These packets are sent with an

poll: add support for OOB TCP and GPIO interrupts

Out-of-band TCP messages are used for TCP data
transmission outside (outband) the inbound TCP
data. These packets are sent with an
"urgent pointer", but previously discarded.

Additionally, when using (e)poll a POLLPRI is
triggered when an interrupt signal is received
on GPIO capable systems such as the Raspberry Pi.

PR-URL: https://github.com/libuv/libuv/pull/1040
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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test: fix POLLHDRUP related failures for AIX

`POLLHDRUP` is not implemented on AIX. Therefore `UV_DISCONNECT` will
never be set on `events`. This causes the socket to never be closed and

test: fix POLLHDRUP related failures for AIX

`POLLHDRUP` is not implemented on AIX. Therefore `UV_DISCONNECT` will
never be set on `events`. This causes the socket to never be closed and
the tests to be stuck inside `pollset_poll` indefinitely, resulting in a
timeout.

This fixes the following tests:
- poll_duplex
- poll_unidirectional

Updated docs to let end users know that `UV_DISCONNECT` can be set, but
is unsupported on AIX.

Fixes: https://github.com/libuv/libuv/issues/844
PR-URL: https://github.com/libuv/libuv/pull/857
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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poll: add UV_DISCONNECT event

It allows detecting the remote socket closing the connection. It's
emitted when `EPOLLRDHUP`(Linux), `EV_EOF`(BSD), `POLLRDHUP`(Solaris,
AIX) and `AFD_P

poll: add UV_DISCONNECT event

It allows detecting the remote socket closing the connection. It's
emitted when `EPOLLRDHUP`(Linux), `EV_EOF`(BSD), `POLLRDHUP`(Solaris,
AIX) and `AFD_POLL_DISCONNECT`(Windows) events are received.

PR-URL: https://github.com/libuv/libuv/pull/691
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Fedor Indutny <fedor@indutny.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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doc: link system and library calls to man pages

PR-URL: https://github.com/libuv/libuv/pull/236
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

unix, windows: set non-block mode in uv_poll_init

libuv requires that the socket/fd is in non-blocking mode, so do it
internally so the user doesn't need to write platform specific code

unix, windows: set non-block mode in uv_poll_init

libuv requires that the socket/fd is in non-blocking mode, so do it
internally so the user doesn't need to write platform specific code to
do so.

This also makes the API consistent with uv_{tcp,udp,pipe}_open, since
it's not required to pass the fd in non-blocking mode there either.

PR-URL: https://github.com/libuv/libuv/pull/136
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

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doc: add API documentation