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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/Process.h
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@ -591,6 +591,9 @@ public:
ErrorOr<size_t> procfs_get_file_description_link(unsigned fd, KBufferBuilder& builder) const;
ErrorOr<void> traverse_file_descriptions_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const;
ErrorOr<NonnullRefPtr<Inode>> lookup_file_descriptions_directory(ProcFS const&, StringView name) const;
ErrorOr<NonnullRefPtr<Inode>> lookup_children_directory(ProcFS const&, StringView name) const;
ErrorOr<void> traverse_children_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const;
ErrorOr<size_t> procfs_get_child_proccess_link(ProcessID child_pid, KBufferBuilder& builder) const;
private:
inline PerformanceEventBuffer* current_perf_events_buffer()