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Kernel: Add /proc/{pid}/children to ProcFS

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This exposes the child processes for a process as a directory
of symlinks to the respective /proc entries for each child.

This makes for an easier and possibly more efficient way
to find and count a process's children. Previously the only
method was to parse the entire /proc/all JSON file.
This commit is contained in:
MacDue 2022-05-04 16:22:18 +01:00 • committed by Ali Mohammad Pur
parent 222079cd80
commit d951e2ca97
7 changed files with 73 additions and 0 deletions
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3
Kernel/FileSystem/ProcFS.h
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@ -172,11 +172,14 @@ public:
static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_file_description_link(ProcFS const&, unsigned, ProcessID);
static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_thread_stack(ProcFS const&, ThreadID, ProcessID);
static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_pid_property(ProcFS const&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_child_process_link(ProcFS const&, ProcessID, ProcessID);
private:
ProcFSProcessPropertyInode(ProcFS const&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
ProcFSProcessPropertyInode(ProcFS const&, ThreadID, ProcessID);
ProcFSProcessPropertyInode(ProcFS const&, unsigned, ProcessID);
ProcFSProcessPropertyInode(ProcFS const&, ProcessID, ProcessID);
// ^Inode
virtual ErrorOr<void> attach(OpenFileDescription& description) override;
virtual void did_seek(OpenFileDescription&, off_t) override;