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在linux进程中的fd #37

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ab503044120 opened this issue Jun 17, 2020 · 0 comments

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ab503044120 commented Jun 17, 2020

学科：《深入理解计算机系统》
类型：知识理解
内容：第十二章 12.2小节 684页

如上图select 方法第一个参数需要传最大的fd ,由此有几个疑问

每个进程的fd是不是有限制呢,最大是多少呢
每个进程fd为什么都是独立计算的呢( 从3开始,012是标准准io)
关闭进程后fd会自动回收吗(包括子进程和父进程)

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