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73ceacd236
* ListProcesses through PID when cgroup is not found * add changelog entry * update the ListByPid for windows
32 lines
1.1 KiB
Go
32 lines
1.1 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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//go:build windows
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package procstats
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import (
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"github.com/hashicorp/go-set/v3"
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"github.com/mitchellh/go-ps"
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)
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// ListByPid will scan the process table and return a set of the process family
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// tree starting with executorPID as the root.
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//
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// The implementation here specifically avoids using more than one system
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// call. Unlike on Linux where we just read a cgroup, on Windows we must build
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// the tree manually. We do so knowing only the child->parent relationships.
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//
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// So this turns into a fun leet code problem, where we invert the tree using
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// only a bucket of edges pointing in the wrong direction. Basically we just
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// iterate every process, recursively follow its parent, and determine whether
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// executorPID is an ancestor.
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//
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// See https://github.com/hashicorp/nomad/issues/20042 as an example of what
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// happens when you use syscalls to work your way from the root down to its
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// descendants.
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func ListByPid(executorPID int) set.Collection[ProcessID] {
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procs := list(executorPID, ps.Processes)
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return procs
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}
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