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Kernel: Create /proc/pid/cmdline to expose process arguments in procfs

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In typical serenity style, they are just a JSON array
This commit is contained in:
Andrew Kaster 2022-06-12 23:04:35 -06:00 • committed by Andreas Kling
parent ad0a001f0a
commit 940be19259
5 changed files with 17 additions and 0 deletions
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4
Kernel/FileSystem/ProcFS.cpp
View file

@ -311,6 +311,8 @@ ErrorOr<NonnullRefPtr<Inode>> ProcFSProcessDirectoryInode::lookup(StringView nam
return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::PerformanceEvents, associated_pid()));
if (name == "vm"sv)
return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats, associated_pid()));
if (name == "cmdline"sv)
return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::CommandLine, associated_pid()));
return ENOENT;
}
@ -571,6 +573,8 @@ ErrorOr<void> ProcFSProcessPropertyInode::try_to_acquire_data(Process& process,
return process.procfs_get_perf_events(builder);
case SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats:
return process.procfs_get_virtual_memory_stats(builder);
case SegmentedProcFSIndex::MainProcessProperty::CommandLine:
return process.procfs_get_command_line(builder);
default:
VERIFY_NOT_REACHED();
}

1
Kernel/Process.h
View file

@ -585,6 +585,7 @@ public:
ErrorOr<void> procfs_get_virtual_memory_stats(KBufferBuilder& builder) const;
ErrorOr<void> procfs_get_binary_link(KBufferBuilder& builder) const;
ErrorOr<void> procfs_get_current_work_directory_link(KBufferBuilder& builder) const;
ErrorOr<void> procfs_get_command_line(KBufferBuilder& builder) const;
mode_t binary_link_required_mode() const;
ErrorOr<void> procfs_get_thread_stack(ThreadID thread_id, KBufferBuilder& builder) const;
ErrorOr<void> traverse_stacks_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const;

1
Kernel/ProcessExposed.h
View file

@ -30,6 +30,7 @@ enum class MainProcessProperty {
CurrentWorkDirectoryLink = 5,
PerformanceEvents = 6,
VirtualMemoryStats = 7,
CommandLine = 8,
};
enum class ProcessSubDirectory {

1
Kernel/ProcessProcFSTraits.cpp
View file

@ -63,6 +63,7 @@ ErrorOr<void> Process::ProcessProcFSTraits::traverse_as_directory(FileSystemID f
TRY(callback({ "cwd", { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(process->pid(), SegmentedProcFSIndex::MainProcessProperty::CurrentWorkDirectoryLink) }, DT_LNK }));
TRY(callback({ "perf_events", { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(process->pid(), SegmentedProcFSIndex::MainProcessProperty::PerformanceEvents) }, DT_REG }));
TRY(callback({ "vm", { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(process->pid(), SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats) }, DT_REG }));
TRY(callback({ "cmdline", { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(process->pid(), SegmentedProcFSIndex::MainProcessProperty::CommandLine) }, DT_REG }));
return {};
}

10
Kernel/ProcessSpecificExposed.cpp
View file

@ -314,6 +314,16 @@ ErrorOr<void> Process::procfs_get_current_work_directory_link(KBufferBuilder& bu
return builder.append(TRY(const_cast<Process&>(*this).current_directory()->try_serialize_absolute_path())->view());
}
ErrorOr<void> Process::procfs_get_command_line(KBufferBuilder& builder) const
{
auto array = TRY(JsonArraySerializer<>::try_create(builder));
for (auto const& arg : arguments()) {
TRY(array.add(arg.view()));
}
TRY(array.finish());
return {};
}
mode_t Process::binary_link_required_mode() const
{
if (!executable())