当前大多数Linux发行版使用功能强大的glibc(GNU C library)作为C标准库(简称C库),但glibc的LGPL协议存在商用不友好条款,制约了商业Linux发行版的推广.一种可行的解决方案是选择某个与glibc相比尚有功能缺陷但适宜商用的C库加以补全,...当前大多数Linux发行版使用功能强大的glibc(GNU C library)作为C标准库(简称C库),但glibc的LGPL协议存在商用不友好条款,制约了商业Linux发行版的推广.一种可行的解决方案是选择某个与glibc相比尚有功能缺陷但适宜商用的C库加以补全,从而制成新的C库以替代glibc.开源欧拉(openEuler)操作系统社区以MIT协议的musl libc作为新的C库选型.新C库对已有应用软件的兼容是成功替换的关键,而精确的兼容性分析算法不仅可以定位缺失API,还可以量化计算兼容性和API补全的优先级.为此,提出兼容性分析算法来研究openEuler的4种主要软件生态中的musl libc兼容性和缺失API优先级.基于应用软件包之间的依赖关系和谷歌PageRank算法的思想,提出了PackageRank算法和APIRank算法,分别用于软件包兼容性度量和优先级计算.这2种算法提供了系统个性化兼容分析的方法,所需信息易于获取,适用于缺乏用户数据统计的、尚不完整而仍有开发需求的系统及构件.这2种算法在musl libc上的分析结果清晰准确,与软件生态的特点和现状相符,与musl libc的国际社区开发者的观点接近,为openEuler的新C库补全工作提供了有效指导.展开更多
This paper introduces the usage of these functions. It presents the technique of how to program with them to perform the serial communications between a computer and other digital devices by the serial porst in Window...This paper introduces the usage of these functions. It presents the technique of how to program with them to perform the serial communications between a computer and other digital devices by the serial porst in Windows95. The related sample codes of the applications of this technique written in C++ programming language are also given. This technique is applied successfully to receive the data of the radio noise from a frequency monitor.展开更多
基金Supported by the 86 3 High Technology Project of China (86 3-818-0 1-0 2 )
文摘This paper introduces the usage of these functions. It presents the technique of how to program with them to perform the serial communications between a computer and other digital devices by the serial porst in Windows95. The related sample codes of the applications of this technique written in C++ programming language are also given. This technique is applied successfully to receive the data of the radio noise from a frequency monitor.
