Lennart Poettering
0c4d1e6d96
Let's make sure we signal out-of-band via an error message if a process doesn't have a parent process whose PID we could return. Otherwise we'll too likely hide errors, as we return an invalid PID 0, which in other contexts has special meaning (i.e. usually "myself"). Replaces: #20153 This is based on work by @dtardon, but goes a different route, by ensuring we propagate a proper error in this case. This modernizes the function in question a bit in other ways, i.e. renames stuff and makes the return parameter optional.
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