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https://github.com/RGBCube/serenity
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c6f2890d8e
FileHandle gets a hasDataAvailableForRead() getter. If this returns true in sys$read(), the task will block(BlockedRead) + yield. The fd blocked on is stored in Task::m_fdBlockedOnRead. The scheduler then looks at the state of that fd during the unblock phase. This makes "sh" restful. :^) There's still some problem with the kernel not surviving the colonel task getting scheduled. I need to figure that out and fix it.
31 lines
568 B
C++
31 lines
568 B
C++
#include "ZeroDevice.h"
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#include "Limits.h"
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#include <AK/StdLib.h>
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#include <AK/kstdio.h>
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ZeroDevice::ZeroDevice()
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{
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}
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ZeroDevice::~ZeroDevice()
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{
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}
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bool ZeroDevice::hasDataAvailableForRead() const
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{
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return true;
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}
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Unix::ssize_t ZeroDevice::read(byte* buffer, Unix::size_t bufferSize)
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{
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kprintf("ZeroDevice: read from zero\n");
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Unix::size_t count = min(GoodBufferSize, bufferSize);
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memset(buffer, 0, count);
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return count;
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}
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Unix::ssize_t ZeroDevice::write(const byte*, Unix::size_t bufferSize)
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{
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return min(GoodBufferSize, bufferSize);
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}
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