How to get the exit code of `command | getline [var]`?

[Peng Yu]

Hi,

There is an error below. But I can not get the error code. Is there a
way to get the error code? Thanks.

$ awk -v tmpfile="$(mktemp -u)" -e 'BEGIN { exit_code = "cat " tmpfile
| getline x; print exit_code; print x }'
cat: /tmp/mktemp/tmp.USzT4D7yJ3: No such file or directory
0

-- 
Regards,
Peng