Tom Lane wrote:
I don't offhand know of any Unix platforms where they cannot be found
out

I don't know which platforms it is secure/insecure on, but I can certainly imagine secure systems where ps(1) data in general is viewed as sensitive and thus not made globally visible.

My inclination is to remove this from HEAD (where it may be moot anyway
by the time 8.1 freezes) and from 8.0.

I don't think there is sufficient justification for removing this feature and breaking users of a stable release series. The documentation states this feature is likely insecure, so presumably people who are using it are aware of the consequences.

-Neil

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