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Kernel/LibC: Implement super basic select

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This does not really even block but it works... :D
This commit is contained in:
Bananymous
2024-02-12 17:26:33 +02:00
parent f50b4be162
commit 3fc1edede0
34 changed files with 285 additions and 41 deletions
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4
kernel/include/kernel/FS/Ext2/Inode.h
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@@ -43,6 +43,10 @@ namespace Kernel
virtual BAN::ErrorOr<void> truncate_impl(size_t) override;
virtual BAN::ErrorOr<void> chmod_impl(mode_t) override;
virtual bool can_read_impl() const override { return true; }
virtual bool can_write_impl() const override { return true; }
virtual bool has_error_impl() const override { return false; }
private:
// Returns maximum number of data blocks in use
// NOTE: the inode might have more blocks than what this suggests if it has been shrinked

12
kernel/include/kernel/FS/Inode.h
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@@ -113,7 +113,11 @@ namespace Kernel
BAN::ErrorOr<void> truncate(size_t);
BAN::ErrorOr<void> chmod(mode_t);
BAN::ErrorOr<void> chown(uid_t, gid_t);
bool has_data() const;
// Select/Non blocking API
bool can_read() const;
bool can_write() const;
bool has_error() const;
BAN::ErrorOr<long> ioctl(int request, void* arg);
@@ -144,7 +148,11 @@ namespace Kernel
virtual BAN::ErrorOr<void> truncate_impl(size_t) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<void> chmod_impl(mode_t) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<void> chown_impl(uid_t, gid_t) { return BAN::Error::from_errno(ENOTSUP); }
virtual bool has_data_impl() const { dwarnln("nonblock not supported"); return true; }
// Select/Non blocking API
virtual bool can_read_impl() const = 0;
virtual bool can_write_impl() const = 0;
virtual bool has_error_impl() const = 0;
virtual BAN::ErrorOr<long> ioctl_impl(int request, void* arg) { return BAN::Error::from_errno(ENOTSUP); }

4
kernel/include/kernel/FS/Pipe.h
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@@ -34,6 +34,10 @@ namespace Kernel
virtual BAN::ErrorOr<size_t> read_impl(off_t, BAN::ByteSpan) override;
virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override;
virtual bool can_read_impl() const override { return !m_buffer.empty(); }
virtual bool can_write_impl() const override { return true; }
virtual bool has_error_impl() const override { return false; }
private:
Pipe(const Credentials&);

5
kernel/include/kernel/FS/ProcFS/Inode.h
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@@ -43,7 +43,10 @@ namespace Kernel
// You may not write here and this is always non blocking
virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override { return BAN::Error::from_errno(EINVAL); }
virtual BAN::ErrorOr<void> truncate_impl(size_t) override { return BAN::Error::from_errno(EINVAL); }
virtual bool has_data_impl() const override { return true; }
virtual bool can_read_impl() const override { return true; }
virtual bool can_write_impl() const override { return false; }
virtual bool has_error_impl() const override { return false; }
private:
ProcROInode(Process&, size_t (Process::*)(off_t, BAN::ByteSpan) const, TmpFileSystem&, const TmpInodeInfo&);

18
kernel/include/kernel/FS/TmpFS/Inode.h
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@@ -72,7 +72,10 @@ namespace Kernel
virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override;
virtual BAN::ErrorOr<void> truncate_impl(size_t) override;
virtual BAN::ErrorOr<void> chmod_impl(mode_t) override;
virtual bool has_data_impl() const override { return true; }
virtual bool can_read_impl() const override { return true; }
virtual bool can_write_impl() const override { return true; }
virtual bool has_error_impl() const override { return false; }
private:
TmpFileInode(TmpFileSystem&, ino_t, const TmpInodeInfo&);
@@ -91,7 +94,10 @@ namespace Kernel
virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override { return BAN::Error::from_errno(ENODEV); }
virtual BAN::ErrorOr<void> truncate_impl(size_t) override { return BAN::Error::from_errno(ENODEV); }
virtual BAN::ErrorOr<void> chmod_impl(mode_t) override;
virtual bool has_data_impl() const override { return true; }
virtual bool can_read_impl() const override { return false; }
virtual bool can_write_impl() const override { return false; }
virtual bool has_error_impl() const override { return false; }
private:
TmpSocketInode(TmpFileSystem&, ino_t, const TmpInodeInfo&);
@@ -110,6 +116,10 @@ namespace Kernel
protected:
virtual BAN::ErrorOr<BAN::String> link_target_impl() override;
virtual bool can_read_impl() const override { return false; }
virtual bool can_write_impl() const override { return false; }
virtual bool has_error_impl() const override { return false; }
private:
TmpSymlinkInode(TmpFileSystem&, ino_t, const TmpInodeInfo&);
};
@@ -136,6 +146,10 @@ namespace Kernel
virtual BAN::ErrorOr<void> create_directory_impl(BAN::StringView, mode_t, uid_t, gid_t) override final;
virtual BAN::ErrorOr<void> unlink_impl(BAN::StringView) override;
virtual bool can_read_impl() const override { return false; }
virtual bool can_write_impl() const override { return false; }
virtual bool has_error_impl() const override { return false; }
private:
template<TmpFuncs::for_each_valid_entry_callback F>
void for_each_valid_entry(F callback);