Linus Torvalds <torvalds@xxxxxxxx> writes:
> That way, if you want to do the fd thing, you can always just do
>
> GIT_TRACE=/proc/self/fd/9 make test 9>/var/tmp/trace.log
>
> although I really don't know how well that works across a fork/exec that
> may or may not be closing the file descriptor (I think it's much simpler
> and more obvious to just give the filename directly).
Actually it was me who suggested the use of fd directly, along
with trying to do one message in a single write (i.e. not doing
stdio as much as possible).
Process A has fd=9 opened to /var/tmp/trace.log and forks
process B.
(1) process B execs something else, and just writes into fd=9
or
(2) process B execs something else, perhaps after closing fd=9,
and the exec'ed image opens /var/tmp/trace.log with
"O_APPEND|O_CREAT" and gets a fd; it writes into this fd.
I somehow felt there would be less interference between writes
issued by process A and process B, but probably I am mistaken.
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