[TUHS] Excise process from a pipe

Doug McIlroy doug at cs.dartmouth.edu
Thu Jul 10 22:04:43 AEST 2014

In the suggested answer, the code changes but the process survives.

I suspect the answer to my original question is no, but I know only a tiny
fraction of the cumulative API of the extended Unix family.


>> Was there ever a
>> flavor of Unix in which a process could excise itself
>> from a pipeline without breaking the pipeline?
> If in the middle of a pipeline, all I can think of is:
>       close fd 0 and fd 1
>       dup() read end of pipe 1 to be stdin (fd 0)
>       dup() write end of pipe 2 to be stdout (fd 1)
>       exec("/bin/cat")

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