APUE学习笔记 - Chapter 2 . Unix Standardization and Implementations

[b]1.Unix 的标准
[/b]

1.1 ISO C
1.2 POSIX( Poratble Operationg System Interface )
POSIX包含了ISO C中的标准程序
1.3 Single Unix Specification
2.Unix的实现
2.1 Unix SystemV Release 4 , AT&T's Unix System Laboratories
2.2 4.4BSD , Berkeley Software Distribution
2.3 FreeBSD, Based on 4.4BSD-Lite
2.4 Linux
2.5 Mac OS X , a combination of Mach Kernel and the FreeBSD Operationg system
2.6 Solaris, Based on System V Release 4
[b]3.Limits[/b]
3.1 Compile-time limits，定义于头文件中，程序可以通过头文件进行判定。
3.2 Runtime limits，需要程序动态调用函数去获得相关的限制值
3.2.1 与文件和目录无关 sysconf
3.2.2 与文件和目录有关 pathconf/fpathconf