Pipe (管道)

Abstract

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• Allow data to flow between two Process (进程) or among Thread in a single process in a uni-directional manner. One party writes to the pipe, and the other reads from it
• Sort of Pseudo-file that can be used to connect 2 Process
• Direct one’s output to another’s input

3 Default Pipe Channels

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Under the POSIX

1. stdin: File Descriptor is 0
2. stdout: File Descriptor is 1
3. stderr: File Descriptor is 2