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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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1
Kernel/ProcessProcFSTraits.cpp
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@ -55,6 +55,7 @@ ErrorOr<void> Process::ProcessProcFSTraits::traverse_as_directory(FileSystemID f
TRY(callback({ "..", { fsid, ProcFSComponentRegistry::the().root_directory().component_index() }, DT_DIR }));
TRY(callback({ "fd", { fsid, SegmentedProcFSIndex::build_segmented_index_for_sub_directory(process->pid(), SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions) }, DT_DIR }));
TRY(callback({ "stacks", { fsid, SegmentedProcFSIndex::build_segmented_index_for_sub_directory(process->pid(), SegmentedProcFSIndex::ProcessSubDirectory::Stacks) }, DT_DIR }));
TRY(callback({ "children", { fsid, SegmentedProcFSIndex::build_segmented_index_for_sub_directory(process->pid(), SegmentedProcFSIndex::ProcessSubDirectory::Children) }, DT_DIR }));
TRY(callback({ "unveil", { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(process->pid(), SegmentedProcFSIndex::MainProcessProperty::Unveil) }, DT_REG }));
TRY(callback({ "pledge", { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(process->pid(), SegmentedProcFSIndex::MainProcessProperty::Pledge) }, DT_REG }));
TRY(callback({ "fds", { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(process->pid(), SegmentedProcFSIndex::MainProcessProperty::OpenFileDescriptions) }, DT_DIR }));