openharmony_ci
61129f5a9c
fd泄露问题修复
Created-by: baozewei
Commit-by: baozewei
Merged-by: openharmony_ci
Description: ### 一、内容说明（相关的Issue）
### 二、建议测试周期和提测地址
建议测试完成时间：xxxx.xx.xx
投产上线时间：xxxx.xx.xx
提测地址：CI环境/压测环境
测试账号：
### 三、变更内容
* 3.1 关联PR列表
* 3.2 数据库和部署说明
1. 常规更新
2. 重启unicorn
3. 重启sidekiq
4. 迁移任务：是否有迁移任务，没有写 "无"
5. rake脚本：`bundle exec xxx RAILS_ENV = production`；没有写 "无"
* 3.4 其他技术优化内容（做了什么，变更了什么）
- 重构了 xxxx 代码
- xxxx 算法优化
* 3.5 废弃通知（什么字段、方法弃用？）
* 3.6 后向不兼容变更（是否有无法向后兼容的变更？）
### 四、研发自测点（自测哪些？冒烟用例全部自测？）
自测测试结论：
### 五、测试关注点（需要提醒QA重点关注的、可能会忽略的地方）
检查点：
| 需求名称 | 是否影响xx公共模块 | 是否需要xx功能 | 需求升级是否依赖其他子产品 |
|------|------------|----------|---------------|
| xxx | 否 | 需要 | 不需要 |
| | | | |
接口测试：
性能测试：
并发测试：
其他：
See merge request: openharmony/third_party_cups!177
OpenPrinting CUPS v2.4.14
Introduction
OpenPrinting CUPS is the most current version of CUPS, a standards-based, open source printing system for Linux® and other Unix®-like operating systems. CUPS supports printing to:
- AirPrint™ and IPP Everywhere™ printers,
- Network and local (USB) printers with Printer Applications, and
- Network and local (USB) printers with (legacy) PPD-based printer drivers.
CUPS provides the System V ("lp") and Berkeley ("lpr") command-line interfaces, a configurable web interface, a C API, and common print filters, drivers, and backends for printing. The cups-filters project provides additional filters and drivers.
CUPS is licensed under the Apache License Version 2.0 with an exception to allow
linking against GNU GPL2-only software. See the files LICENSE and NOTICE
for more information.
Note: Apple maintains a separate repository for the CUPS that ships with macOS and iOS at https://github.com/apple/cups.
Reading the Documentation
Initial documentation to get you started is provided in the root directory of the CUPS sources:
CHANGES.md: A list of changes in the current major release of CUPS.CONTRIBUTING.md: Guidelines for contributing to the CUPS project.CREDITS.md: A list of past contributors to the CUPS project.DEVELOPING.md: Guidelines for developing code for the CUPS project.INSTALL.md: Instructions for building and installing CUPS.LICENSE: The CUPS license agreement (Apache 2.0).NOTICE: Copyright notices and exceptions to the CUPS license agreement.README.md: This file.REPORTING_ISSUES.md: Instructions what information to provide when reporting an issue.
Once you have installed the software you can access the documentation (and a
bunch of other stuff) online at http://localhost:631/ and using the man
command, for example man cups.
If you're having trouble getting that far, the documentation is located under
the doc/help and man directories.
Please read the documentation before asking questions.
Setting Up Printers
CUPS includes a web-based administration tool that allows you to manage printers, classes, and jobs on your server. Open http://localhost:631/admin/ in your browser to access the printer administration tools. You will be asked for the administration password (root or any other user in the "sys", "system", "root", "admin", or "lpadmin" group on your system) when performing any administrative function.
The lpadmin command is used to manage printers from the command-line. For
example, the following command creates a print queue called "myprinter" for an
IPP Everywhere printer at address "11.22.33.44":
lpadmin -p myprinter -E -v "ipp://11.22.33.44/ipp/print" -m everywhere
The -p option specifies the printer name. The -E option enables the printer
and accepts new print jobs immediately. The -v option specifies the device
URI for the printer, which tells CUPS how to communicate with the printer. And
the -m option specifies the model (driver) to use, in this case the IPP
Everywhere ("everywhere") driver that is used for AirPrint and IPP Everywhere
printers as well as shared printers and printers supported through Printer
Applications.
Legacy printers are supported using PPD (PostScript Printer Description) files that describe printer capabilities and driver programs needed for each printer. CUPS includes several sample PPD files for common legacy printers:
| Driver | PPD Name |
|---|---|
| Dymo Label Printers | drv:///sample.drv/dymo.ppd |
| Intellitech Intellibar | drv:///sample.drv/intelbar.ppd |
| EPSON 9-pin Series | drv:///sample.drv/epson9.ppd |
| EPSON 24-pin Series | drv:///sample.drv/epson24.ppd |
| Generic PCL Laser Printer | drv:///sample.drv/generpcl.ppd |
| Generic PostScript Printer | drv:///sample.drv/generic.ppd |
| HP DeskJet Series | drv:///sample.drv/deskjet.ppd |
| HP LaserJet Series | drv:///sample.drv/laserjet.ppd |
| OKIDATA 9-Pin Series | drv:///sample.drv/okidata9.ppd |
| OKIDATA 24-Pin Series | drv:///sample.drv/okidat24.ppd |
| Zebra CPCL Label Printer | drv:///sample.drv/zebracpl.ppd |
| Zebra EPL1 Label Printer | drv:///sample.drv/zebraep1.ppd |
| Zebra EPL2 Label Printer | drv:///sample.drv/zebraep2.ppd |
| Zebra ZPL Label Printer | drv:///sample.drv/zebra.ppd |
The sample drivers provide basic printing capabilities, but generally do not exercise the full potential of the printers or CUPS. Other drivers provide greater printing capabilities.
You can run the lpinfo -m command to list all of the available drivers:
lpinfo -m
Similarly, the lpinfo -v command lists the available printers and their device
URIs:
lpinfo -v
Once you know the device URI and driver name, add the printer using the
lpadmin command:
lpadmin -p PRINTER-NAME -E -v "DEVICE-URI" -m DRIVER-NAME
Printing Files
CUPS provides both the System V lp and Berkeley lpr commands for printing:
lp FILENAME
lpr FILENAME
Both the lp and lpr commands support printing options:
lp -o media=A4 -o resolution=600dpi FILENAME
lpr -o media=A4 -o resolution=600dpi FILENAME
CUPS recognizes many types of images files as well as PDF, PostScript, and text files, so you can print those files directly rather than through an application.
If you have an application that generates output specifically for your printer
then you need to use the -oraw or -l options:
lp -o raw FILENAME
lpr -l FILENAME
This will prevent the filters from misinterpreting your print file.
Legal Stuff
Copyright © 2020-2025 by OpenPrinting
Copyright © 2007-2020 by Apple Inc.
Copyright © 1997-2007 by Easy Software Products.
CUPS is provided under the terms of the Apache License, Version 2.0 with
exceptions for GPL2/LGPL2 software. A copy of this license can be found in the
file LICENSE. Additional legal information is provided in the file NOTICE.
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.