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Kernel+LibC: Implement fcntl(2) advisory locks

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Advisory locks don't actually prevent other processes from writing to
the file, but they do prevent other processes looking to acquire and
advisory lock on the file.

This implementation currently only adds non-blocking locks, which are
all I need for now.
This commit is contained in:
Peter Elliott 2021-07-18 23:29:56 -06:00 • committed by Ali Mohammad Pur
parent fbc56461da
commit 3fa2816642
8 changed files with 186 additions and 7 deletions
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18
Kernel/FileSystem/FileDescription.cpp
View file

@ -74,6 +74,9 @@ FileDescription::~FileDescription()
(void)m_file->close();
if (m_inode)
m_inode->detach(*this);
if (m_inode)
m_inode->remove_flocks_for_description(*this);
}
KResult FileDescription::attach()
@ -446,4 +449,19 @@ FileBlockCondition& FileDescription::block_condition()
return m_file->block_condition();
}
KResult FileDescription::apply_flock(Process const& process, Userspace<flock const*> lock)
{
if (!m_inode)
return EBADF;
return m_inode->apply_flock(process, *this, lock);
}
KResult FileDescription::get_flock(Userspace<flock*> lock) const
{
if (!m_inode)
return EBADF;
return m_inode->get_flock(*this, lock);
}
}