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Kernel: Add basic support for O_NONBLOCK (only for tty)

This commit is contained in:
Bananymous 2023-09-04 12:57:52 +03:00
parent 19d0fb6fcd
commit f1d4d5f995
4 changed files with 11 additions and 1 deletions
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1
kernel/include/kernel/FS/Inode.h
View File

@ -87,6 +87,7 @@ namespace Kernel
virtual BAN::ErrorOr<size_t> read(size_t, void*, size_t) { if (mode().ifdir()) return BAN::Error::from_errno(EISDIR); ASSERT_NOT_REACHED(); }
virtual BAN::ErrorOr<size_t> write(size_t, const void*, size_t) { if (mode().ifdir()) return BAN::Error::from_errno(EISDIR); ASSERT_NOT_REACHED(); }
virtual bool has_data() const { dwarnln("nonblock not supported"); return true; }
virtual BAN::ErrorOr<void> truncate(size_t) { if (mode().ifdir()) return BAN::Error::from_errno(EISDIR); return BAN::Error::from_errno(ENOTSUP); }

3
kernel/include/kernel/Terminal/TTY.h
View File

@ -35,6 +35,7 @@ namespace Kernel
virtual BAN::ErrorOr<size_t> read(size_t, void*, size_t) override;
virtual BAN::ErrorOr<size_t> write(size_t, const void*, size_t) override;
virtual bool has_data() const override;
private:
void clear();
@ -78,7 +79,7 @@ namespace Kernel
};
private:
Kernel::SpinLock m_lock;
mutable Kernel::SpinLock m_lock;
State m_state { State::Normal };
AnsiState m_ansi_state { };

2
kernel/kernel/OpenFileDescriptorSet.cpp
View File

@ -234,6 +234,8 @@ namespace Kernel
{
TRY(validate_fd(fd));
auto& open_file = m_open_files[fd];
if ((open_file->flags & O_NONBLOCK) && !open_file->inode->has_data())
return 0;
size_t nread = TRY(open_file->inode->read(open_file->offset, buffer, count));
open_file->offset += nread;
return nread;

6
kernel/kernel/Terminal/TTY.cpp
View File

@ -679,6 +679,12 @@ flush:
return count;
}
bool TTY::has_data() const
{
LockGuard _(m_lock);
return m_output.flush;
}
void TTY::putchar_current(uint8_t ch)
{
ASSERT(s_tty);