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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
Notes: sideshowbarker 2024-07-18 03:35:30 +09:00
7 changed files with 73 additions and 0 deletions
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23
Kernel/FileSystem/ProcFS.cpp
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@ -295,6 +295,8 @@ ErrorOr<NonnullRefPtr<Inode>> ProcFSProcessDirectoryInode::lookup(StringView nam
return TRY(ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions, associated_pid()));
if (name == "stacks"sv)
return TRY(ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::Stacks, associated_pid()));
if (name == "children"sv)
return TRY(ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::Children, associated_pid()));
if (name == "unveil"sv)
return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Unveil, associated_pid()));
if (name == "pledge"sv)
@ -367,6 +369,8 @@ ErrorOr<void> ProcFSProcessSubDirectoryInode::traverse_as_directory(Function<Err
return process->traverse_file_descriptions_directory(procfs().fsid(), move(callback));
case SegmentedProcFSIndex::ProcessSubDirectory::Stacks:
return process->traverse_stacks_directory(procfs().fsid(), move(callback));
case SegmentedProcFSIndex::ProcessSubDirectory::Children:
return process->traverse_children_directory(procfs().fsid(), move(callback));
default:
VERIFY_NOT_REACHED();
}
@ -384,6 +388,8 @@ ErrorOr<NonnullRefPtr<Inode>> ProcFSProcessSubDirectoryInode::lookup(StringView
return process->lookup_file_descriptions_directory(procfs(), name);
case SegmentedProcFSIndex::ProcessSubDirectory::Stacks:
return process->lookup_stacks_directory(procfs(), name);
case SegmentedProcFSIndex::ProcessSubDirectory::Children:
return process->lookup_children_directory(procfs(), name);
default:
VERIFY_NOT_REACHED();
}
@ -401,6 +407,10 @@ ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::t
{
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, main_property_type, pid));
}
ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_child_process_link(ProcFS const& procfs, ProcessID child_pid, ProcessID pid)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, child_pid, pid));
}
ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(ProcFS const& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)
: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(pid, main_property_type))
@ -423,6 +433,13 @@ ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(ProcFS const& procfs, Thr
m_possible_data.property_index = thread_stack_index.value();
}
ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(ProcFS const& procfs, ProcessID child_pid, ProcessID pid)
: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_children(pid, child_pid))
, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::Children)
{
m_possible_data.property_index = child_pid.value();
}
ErrorOr<void> ProcFSProcessPropertyInode::attach(OpenFileDescription& description)
{
return refresh_data(description);
@ -440,6 +457,8 @@ static mode_t determine_procfs_process_inode_mode(SegmentedProcFSIndex::ProcessS
return S_IFLNK | 0400;
if (parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Stacks)
return S_IFREG | 0400;
if (parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Children)
return S_IFLNK | 0400;
VERIFY(parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Reserved);
if (main_property == SegmentedProcFSIndex::MainProcessProperty::BinaryLink)
return S_IFLNK | 0777;
@ -531,6 +550,10 @@ ErrorOr<void> ProcFSProcessPropertyInode::try_to_acquire_data(Process& process,
TRY(process.procfs_get_thread_stack(m_possible_data.property_index, builder));
return {};
}
if (m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Children) {
TRY(process.procfs_get_child_proccess_link(m_possible_data.property_index, builder));
return {};
}
VERIFY(m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Reserved);
switch (m_possible_data.property_type) {