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Kernel: Add a Process::FileDescriptions::get_if_valid(index) API

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Note that this is not the same as ::at(index), which has a different
precondition ("allocated" vs "valid").
This commit is contained in:
Ali Mohammad Pur 2021-08-16 06:32:48 +04:30 • committed by Andreas Kling
parent c1ffc17134
commit e9feced041
2 changed files with 26 additions and 0 deletions
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23
Kernel/Process.cpp
View file

@ -428,6 +428,29 @@ RefPtr<Process> Process::from_pid(ProcessID pid)
}); });
} }
const Process::FileDescriptionAndFlags* Process::FileDescriptions::get_if_valid(size_t i) const
{
ScopedSpinLock lock(m_fds_lock);
if (m_fds_metadatas.size() <= i)
return nullptr;
if (auto& metadata = m_fds_metadatas[i]; metadata.is_valid())
return &metadata;
return nullptr;
}
Process::FileDescriptionAndFlags* Process::FileDescriptions::get_if_valid(size_t i)
{
ScopedSpinLock lock(m_fds_lock);
if (m_fds_metadatas.size() <= i)
return nullptr;
if (auto& metadata = m_fds_metadatas[i]; metadata.is_valid())
return &metadata;
return nullptr;
}
const Process::FileDescriptionAndFlags& Process::FileDescriptions::at(size_t i) const const Process::FileDescriptionAndFlags& Process::FileDescriptions::at(size_t i) const
{ {
ScopedSpinLock lock(m_fds_lock); ScopedSpinLock lock(m_fds_lock);

3
Kernel/Process.h
View file

@ -643,6 +643,9 @@ public:
const FileDescriptionAndFlags& at(size_t i) const; const FileDescriptionAndFlags& at(size_t i) const;
FileDescriptionAndFlags& at(size_t i); FileDescriptionAndFlags& at(size_t i);
FileDescriptionAndFlags const* get_if_valid(size_t i) const;
FileDescriptionAndFlags* get_if_valid(size_t i);
void enumerate(Function<void(const FileDescriptionAndFlags&)>) const; void enumerate(Function<void(const FileDescriptionAndFlags&)>) const;
void change_each(Function<void(FileDescriptionAndFlags&)>); void change_each(Function<void(FileDescriptionAndFlags&)>);