mirror of https://github.com/shirou/gopsutil
[process][darwin][freebsd][linux][openbsd] Make process.Children not reliant on pgrep
pgrep -P $PID exits with status of 1 (and nothing in stdout nor stderr) both if a process doesn't exist or it doesn't have child processes, so we don't use it anymore on these OSes. We sort PIDs as pgrep did. Also deprecate the ErrorNoChildren error when there are no child processes, this is erroneous (simply check for the length of the returned slice, plus this is not an error per se), this was only returned on linux anyway. Fixes #1698pull/1706/head
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