ca8c0d5e81
Initially it seemed that there were multiple possible ways to do it. Processing option -p could conditionally add selected processes and their descendants to the list for further work, but it is not guaranteed to know whether the -d option has been used or not, and it also doesn't have access to the process list just yet. There is also descendant_sort() which has access to all possibly needed information, but serves the purely post-processing purpose of sorting output. Then there is the loop that uses invocation information and full process list to create a list of processes for final display. It seems the most natural place to implement this, but indeterminate state of the process list and volatility of the final list that is being created obstruct adding an elegant search for all elements of process descendancy trees. So I opted for adding another loop, just before the one I mentioned above. For all selected processes it conditionally adds direct descendants to the end of this list of selected processes. Possible usage: * ps -auxd -p $$ * ps -auxd -p 1 * while x=$(pgrep svnlite); do clear; ps auxd -p $x; sleep 2; done * ps -auxd -p `pgrep make` Reviewed by: kevans, kaktus (earlier version) MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D24380
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