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Add mechanism to expose kernel variables to userspace via ProcFS.

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Only booleans are supported at first. More types can be added easily.
Use this to add /proc/sys/wm_flash_flush which when enabled flashes pending
screen flush rects in yellow before they happen.
This commit is contained in:
Andreas Kling 2019-01-18 15:01:40 +01:00
parent 9454c5dd52
commit f7cc454162
8 changed files with 121 additions and 29 deletions
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31
VirtualFileSystem/SyntheticFileSystem.cpp
View file

@ -69,7 +69,7 @@ RetainPtr<SynthFSInode> SynthFS::create_text_file(String&& name, ByteBuffer&& co
return file;
}
RetainPtr<SynthFSInode> SynthFS::create_generated_file(String&& name, Function<ByteBuffer()>&& generator, Unix::mode_t mode)
RetainPtr<SynthFSInode> SynthFS::create_generated_file(String&& name, Function<ByteBuffer(SynthFSInode&)>&& generator, Unix::mode_t mode)
{
auto file = adopt(*new SynthFSInode(*this, generate_inode_index()));
file->m_generator = move(generator);
@ -82,6 +82,20 @@ RetainPtr<SynthFSInode> SynthFS::create_generated_file(String&& name, Function<B
return file;
}
RetainPtr<SynthFSInode> SynthFS::create_generated_file(String&& name, Function<ByteBuffer(SynthFSInode&)>&& read_callback, Function<ssize_t(SynthFSInode&, const ByteBuffer&)>&& write_callback, Unix::mode_t mode)
{
auto file = adopt(*new SynthFSInode(*this, generate_inode_index()));
file->m_generator = move(read_callback);
file->m_write_callback = move(write_callback);
file->m_name = move(name);
file->m_metadata.size = 0;
file->m_metadata.uid = 0;
file->m_metadata.gid = 0;
file->m_metadata.mode = mode;
file->m_metadata.mtime = mepoch;
return file;
}
InodeIdentifier SynthFS::add_file(RetainPtr<SynthFSInode>&& file, InodeIndex parent)
{
ASSERT_INTERRUPTS_DISABLED();
@ -197,10 +211,10 @@ ssize_t SynthFSInode::read_bytes(Unix::off_t offset, size_t count, byte* buffer,
ByteBuffer generatedData;
if (m_generator) {
if (!descriptor) {
generatedData = m_generator();
generatedData = m_generator(*this);
} else {
if (!descriptor->generator_cache())
descriptor->generator_cache() = m_generator();
descriptor->generator_cache() = m_generator(*this);
generatedData = descriptor->generator_cache();
}
}
@ -259,10 +273,11 @@ void SynthFSInode::flush_metadata()
{
}
bool SynthFSInode::write(const ByteBuffer&)
bool SynthFSInode::write(const ByteBuffer& data)
{
ASSERT_NOT_REACHED();
return false;
if (!m_write_callback)
return 0; // FIXME: -EPERM?
return m_write_callback(*this, data);
}
bool SynthFSInode::add_child(InodeIdentifier child_id, const String& name, byte file_type, int& error)
@ -274,3 +289,7 @@ bool SynthFSInode::add_child(InodeIdentifier child_id, const String& name, byte
ASSERT_NOT_REACHED();
return false;
}
SynthFSInodeCustomData::~SynthFSInodeCustomData()
{
}