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Kernel: Track time-of-last-write in SlavePTY and report it as mtime

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This commit is contained in:
Andreas Kling 2020-09-06 18:48:24 +02:00
parent ae9c5bf216
commit 4527d9852a
Notes: sideshowbarker 2024-07-19 02:52:57 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/4527d9852aa
4 changed files with 17 additions and 5 deletions
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13
Kernel/FileSystem/DevPtsFS.cpp
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@ -50,7 +50,7 @@ static AK::Singleton<HashTable<unsigned>> s_ptys;
bool DevPtsFS::initialize()
{
m_root_inode = adopt(*new DevPtsFSInode(*this, 1));
m_root_inode = adopt(*new DevPtsFSInode(*this, 1, nullptr));
m_root_inode->m_metadata.inode = { fsid(), 1 };
m_root_inode->m_metadata.mode = 0040555;
m_root_inode->m_metadata.uid = 0;
@ -86,7 +86,7 @@ RefPtr<Inode> DevPtsFS::get_inode(InodeIdentifier inode_id) const
auto* device = Device::get_device(201, pty_index);
ASSERT(device);
auto inode = adopt(*new DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index()));
auto inode = adopt(*new DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index(), static_cast<SlavePTY*>(device)));
inode->m_metadata.inode = inode_id;
inode->m_metadata.size = 0;
inode->m_metadata.uid = device->uid();
@ -109,9 +109,11 @@ void DevPtsFS::unregister_slave_pty(SlavePTY& slave_pty)
s_ptys->remove(slave_pty.index());
}
DevPtsFSInode::DevPtsFSInode(DevPtsFS& fs, unsigned index)
DevPtsFSInode::DevPtsFSInode(DevPtsFS& fs, unsigned index, SlavePTY* pty)
: Inode(fs, index)
{
if (pty)
m_pty = pty->make_weak_ptr();
}
DevPtsFSInode::~DevPtsFSInode()
@ -130,6 +132,11 @@ ssize_t DevPtsFSInode::write_bytes(off_t, ssize_t, const u8*, FileDescription*)
InodeMetadata DevPtsFSInode::metadata() const
{
if (m_pty) {
auto metadata = m_metadata;
metadata.mtime = m_pty->time_of_last_write();
return metadata;
}
return m_metadata;
}

3
Kernel/FileSystem/DevPtsFS.h
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@ -64,7 +64,7 @@ public:
virtual ~DevPtsFSInode() override;
private:
DevPtsFSInode(DevPtsFS&, unsigned index);
DevPtsFSInode(DevPtsFS&, unsigned index, SlavePTY*);
// ^Inode
virtual ssize_t read_bytes(off_t, ssize_t, u8* buffer, FileDescription*) const override;
@ -80,6 +80,7 @@ private:
virtual KResult chmod(mode_t) override;
virtual KResult chown(uid_t, gid_t) override;
WeakPtr<SlavePTY> m_pty;
InodeMetadata m_metadata;
};

1
Kernel/TTY/SlavePTY.cpp
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@ -74,6 +74,7 @@ void SlavePTY::on_master_write(const u8* buffer, ssize_t size)
ssize_t SlavePTY::on_tty_write(const u8* data, ssize_t size)
{
m_time_of_last_write = kgettimeofday().tv_sec;
return m_master->on_slave_write(data, size);
}

5
Kernel/TTY/SlavePTY.h
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@ -40,6 +40,8 @@ public:
void on_master_write(const u8*, ssize_t);
unsigned index() const { return m_index; }
time_t time_of_last_write() const { return m_time_of_last_write; }
private:
// ^TTY
virtual String tty_name() const override;
@ -57,7 +59,8 @@ private:
SlavePTY(MasterPTY&, unsigned index);
RefPtr<MasterPTY> m_master;
unsigned m_index;
time_t m_time_of_last_write { 0 };
unsigned m_index { 0 };
char m_tty_name[32];
};