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poll-h.md 7.02 KB

# poll.h<a name="ZH-CN_TOPIC_0000001055387986"></a>

## **Overview**<a name="section23611824084831"></a>

**Related Modules:**

[IO](IO.md)

**Description:**

Declares I/O multiplexing functions.

You can use the functions provided in this file to perform I/O multiplexing.

**Since:**

1.0

**Version:**

1.0

## **Summary**<a name="section270526204084831"></a>

## Data Structures<a name="nested-classes"></a>

<a name="table1723262006084831"></a>
<table><thead align="left"><tr id="row1379732849084831"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p723064932084831"><a name="p723064932084831"></a><a name="p723064932084831"></a>Data Structure Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p933996839084831"><a name="p933996839084831"></a><a name="p933996839084831"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row135582303084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p614788875084831"><a name="p614788875084831"></a><a name="p614788875084831"></a><a href="pollfd.md">pollfd</a></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p594296747084831"><a name="p594296747084831"></a><a name="p594296747084831"></a>Defines I/O multiplexing. </p>
</td>
</tr>
</tbody>
</table>

## Macros<a name="define-members"></a>

<a name="table136845372084831"></a>
<table><thead align="left"><tr id="row1242806501084831"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p1409192004084831"><a name="p1409192004084831"></a><a name="p1409192004084831"></a>Macro Name and Value</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p1782074499084831"><a name="p1782074499084831"></a><a name="p1782074499084831"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row13990384084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p2038096644084831"><a name="p2038096644084831"></a><a name="p2038096644084831"></a><a href="IO.md#ga52ac479a805051f59643588b096024ff">POLLIN</a>&nbsp;&nbsp;&nbsp;0x001</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p2010727647084831"><a name="p2010727647084831"></a><a name="p2010727647084831"></a>POLLIN event. </p>
</td>
</tr>
<tr id="row165781509084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p530771067084831"><a name="p530771067084831"></a><a name="p530771067084831"></a><a href="IO.md#gab6f53b89c7a4cc5e8349f7c778d85168">POLLPRI</a>&nbsp;&nbsp;&nbsp;0x002</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p2059889376084831"><a name="p2059889376084831"></a><a name="p2059889376084831"></a>POLLPRI event. </p>
</td>
</tr>
<tr id="row809329740084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p569114367084831"><a name="p569114367084831"></a><a name="p569114367084831"></a><a href="IO.md#ga91b3c67129ac7675062f316b840a0d58">POLLOUT</a>&nbsp;&nbsp;&nbsp;0x004</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p159914654084831"><a name="p159914654084831"></a><a name="p159914654084831"></a>POLLOUT event. </p>
</td>
</tr>
<tr id="row1922831126084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1059884369084831"><a name="p1059884369084831"></a><a name="p1059884369084831"></a><a href="IO.md#gab1c532446408c98559d4aaaeeeb99820">POLLERR</a>&nbsp;&nbsp;&nbsp;0x008</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p309758794084831"><a name="p309758794084831"></a><a name="p309758794084831"></a>POLLERR event. </p>
</td>
</tr>
<tr id="row1685851733084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p524516434084831"><a name="p524516434084831"></a><a name="p524516434084831"></a><a href="IO.md#ga262754fe6bdf27c2cd3da43284ec8536">POLLHUP</a>&nbsp;&nbsp;&nbsp;0x010</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1188359125084831"><a name="p1188359125084831"></a><a name="p1188359125084831"></a>POLLHUP event. </p>
</td>
</tr>
<tr id="row1761466911084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p577896970084831"><a name="p577896970084831"></a><a name="p577896970084831"></a><a href="IO.md#gae8bffe35c61e12fb7b408b89721896df">POLLNVAL</a>&nbsp;&nbsp;&nbsp;0x020</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1257184357084831"><a name="p1257184357084831"></a><a name="p1257184357084831"></a>POLLNVAL event. </p>
</td>
</tr>
</tbody>
</table>

## Typedefs<a name="typedef-members"></a>

<a name="table200212197084831"></a>
<table><thead align="left"><tr id="row638960660084831"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p2126020600084831"><a name="p2126020600084831"></a><a name="p2126020600084831"></a>Typedef Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p783246120084831"><a name="p783246120084831"></a><a name="p783246120084831"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row1904372426084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p461282185084831"><a name="p461282185084831"></a><a name="p461282185084831"></a><a href="IO.md#ga0af7a8bdafcd5532e620a11f0d373d52">nfds_t</a></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1637920123084831"><a name="p1637920123084831"></a><a name="p1637920123084831"></a> typedef unsigned long&nbsp;</p>
<p id="p880001995084831"><a name="p880001995084831"></a><a name="p880001995084831"></a>Number of poll types. </p>
</td>
</tr>
</tbody>
</table>

## Functions<a name="func-members"></a>

<a name="table1882542699084831"></a>
<table><thead align="left"><tr id="row516352891084831"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p2106622109084831"><a name="p2106622109084831"></a><a name="p2106622109084831"></a>Function Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p2061409297084831"><a name="p2061409297084831"></a><a name="p2061409297084831"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row262795612084831"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p433001383084831"><a name="p433001383084831"></a><a name="p433001383084831"></a><a href="IO.md#gab7fc0f6be5f13c81de180c1288ba3b6f">poll</a> (struct <a href="pollfd.md">pollfd</a> fds[], <a href="IO.md#ga0af7a8bdafcd5532e620a11f0d373d52">nfds_t</a> nfds, int timeout)</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p388145736084831"><a name="p388145736084831"></a><a name="p388145736084831"></a>int&nbsp;</p>
<p id="p1199668049084831"><a name="p1199668049084831"></a><a name="p1199668049084831"></a>Defines the I/O multiplexing system. </p>
</td>
</tr>
</tbody>
</table>

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提交于 2020-09-08 10:08 . add OpenHarmony 1.0 baseline

poll.h

Overview

Related Modules:

Description:

Declares I/O multiplexing functions.

You can use the functions provided in this file to perform I/O multiplexing.

Since:

1.0

Version:

1.0

Summary

Data Structures

Data Structure Name	Description
pollfd	Defines I/O multiplexing.

Macros

Macro Name and Value	Description
POLLIN 0x001	POLLIN event.
POLLPRI 0x002	POLLPRI event.
POLLOUT 0x004	POLLOUT event.
POLLERR 0x008	POLLERR event.
POLLHUP 0x010	POLLHUP event.
POLLNVAL 0x020	POLLNVAL event.

Typedefs

Typedef Name	Description
nfds_t	typedef unsigned long Number of poll types.

Typedef Name

Description

nfds_t

typedef unsigned long

Number of poll types.

Functions

Function Name	Description
poll (struct pollfd fds[], nfds_t nfds, int timeout)	int Defines the I/O multiplexing system.

Function Name

Description

poll (struct pollfd fds[], nfds_t nfds, int timeout)

int

Defines the I/O multiplexing system.

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poll.h

Overview

Summary

Data Structures

Macros

Typedefs

Functions

简介

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近期动态

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