85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
#include <kernel/FS/Pipe.h>
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#include <kernel/LockGuard.h>
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#include <kernel/Timer/Timer.h>
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namespace Kernel
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{
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BAN::ErrorOr<BAN::RefPtr<Inode>> Pipe::create(const Credentials& credentials)
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{
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Pipe* pipe = new Pipe(credentials);
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if (pipe == nullptr)
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return BAN::Error::from_errno(ENOMEM);
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return BAN::RefPtr<Inode>::adopt(pipe);
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}
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Pipe::Pipe(const Credentials& credentials)
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: m_uid(credentials.euid())
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, m_gid(credentials.egid())
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{
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timespec current_time = SystemTimer::get().real_time();
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m_atime = current_time;
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m_mtime = current_time;
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m_ctime = current_time;
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}
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void Pipe::clone_writing()
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{
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LockGuard _(m_lock);
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ASSERT(m_writing_count > 0);
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m_writing_count++;
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}
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void Pipe::close_writing()
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{
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LockGuard _(m_lock);
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ASSERT(m_writing_count > 0);
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m_writing_count--;
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if (m_writing_count == 0)
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m_semaphore.unblock();
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}
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BAN::ErrorOr<size_t> Pipe::read_impl(off_t, void* buffer, size_t count)
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{
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LockGuard _(m_lock);
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while (m_buffer.empty())
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{
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if (m_writing_count == 0)
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return 0;
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m_lock.unlock();
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m_semaphore.block();
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m_lock.lock();
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}
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size_t to_copy = BAN::Math::min<size_t>(count, m_buffer.size());
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memcpy(buffer, m_buffer.data(), to_copy);
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memmove(m_buffer.data(), m_buffer.data() + to_copy, m_buffer.size() - to_copy);
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MUST(m_buffer.resize(m_buffer.size() - to_copy));
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m_atime = SystemTimer::get().real_time();
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m_semaphore.unblock();
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return to_copy;
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}
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BAN::ErrorOr<size_t> Pipe::write_impl(off_t, const void* buffer, size_t count)
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{
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LockGuard _(m_lock);
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size_t old_size = m_buffer.size();
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TRY(m_buffer.resize(old_size + count));
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memcpy(m_buffer.data() + old_size, buffer, count);
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timespec current_time = SystemTimer::get().real_time();
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m_mtime = current_time;
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m_ctime = current_time;
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m_semaphore.unblock();
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return count;
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}
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} |