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2a78bf8596
The Process::Handler type has KResultOr<FlatPtr> as its return type. Using a different return type with an equally-sized template parameter sort of works but breaks once that condition is no longer true, e.g. for KResultOr<int> on x86_64. Ideally the syscall handlers would also take FlatPtrs as their args so we can get rid of the reinterpret_cast for the function pointer but I didn't quite feel like cleaning that up as well.
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Process.h>
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#include <Kernel/Random.h>
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#include <Kernel/UserOrKernelBuffer.h>
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namespace Kernel {
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// We don't use the flag yet, but we could use it for distinguishing
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// random source like Linux, unlike the OpenBSD equivalent. However, if we
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// do, we should be able of the caveats that Linux has dealt with.
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KResultOr<FlatPtr> Process::sys$getrandom(Userspace<void*> buffer, size_t buffer_size, [[maybe_unused]] unsigned flags)
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{
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REQUIRE_PROMISE(stdio);
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if (buffer_size > NumericLimits<ssize_t>::max())
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return EINVAL;
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auto data_buffer = UserOrKernelBuffer::for_user_buffer(buffer, buffer_size);
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if (!data_buffer.has_value())
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return EFAULT;
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auto result = data_buffer.value().write_buffered<1024>(buffer_size, [&](u8* buffer, size_t buffer_bytes) {
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get_good_random_bytes(buffer, buffer_bytes);
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return buffer_bytes;
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});
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if (result.is_error())
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return result.error();
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else
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return result.release_value();
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}
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}
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