On Tue, 29 Nov 2022, Arsen Arsenović wrote:
The issue here isn't the compilers hanging, it's tee living longer than
all the compilers do because it's stdin doesn't EOF (it'd be preferable
for it to only live as long as the last of the compilers).
I can imagine attempting to implement this with enough pipe and fd
redirection magic, but I'm not sure how (in)elegant that becomes.
It sounds like one way or another you want to copy your endless but
intermittent input to multiple output pipes, but you want to quit as soon
as all the output pipes become broken.
To me, tee sounds like exactly the place to do that. Otherwise, you'd
have to add the broken-pipe detection (as in your patch) to your own
program, along with the rest of tee's basic functionality :)
It would be one thing if you controlled the programs that consume the
input (you could have them handle 'heartbeats' in the input stream, and
once these programs terminate, the heartbeats would trip on the broken
pipe). (However (in)elegant that becomes to implement...)
But if you don't have control over that, the fundamental problem is
detecting broken pipes *without writing to them*, and I don't think that
can be solved with any amount of extra pipes and fd redirection...
Carl
