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libc: Fix t_spawn_fileactions test after ATF update

Authored by arichardson on Feb 15 2021, 11:00 AM.



ATF opens the results file on startup. This fixes problems like
capsicumized tests not being able to open the file on exit.

However, this test closes all file descriptors above 3 to get a
deterministic fd table allocation for the child. Instead of using closefrom
(which will close the ATF output file FD) I've changed this test use
the lowest available fd and pass that to the helper program as a string.

We could also try to re-open the results file in ATF if we get a EBADF
error, but that will fail when running under Capsicum.

Test Plan

test passes now.

Diff Detail

R10 FreeBSD src repository
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.