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628b3badfb
Since we already have the type information in the Userspace template, it was a bit silly to cast manually everywhere. Just add a sufficiently scary-sounding getter for a typed pointer. Thanks @alimpfard for pointing out that I was being silly with tossing out the type. In the future we may want to make this API non-public as well.
64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ssize_t Process::sys$read(int fd, Userspace<u8*> buffer, ssize_t size)
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{
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REQUIRE_PROMISE(stdio);
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if (size < 0)
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return -EINVAL;
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if (size == 0)
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return 0;
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if (!validate_write(buffer, size))
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return -EFAULT;
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#ifdef DEBUG_IO
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dbg() << "sys$read(" << fd << ", " << (const void*)buffer << ", " << size << ")";
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#endif
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auto description = file_description(fd);
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if (!description)
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return -EBADF;
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if (!description->is_readable())
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return -EBADF;
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if (description->is_directory())
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return -EISDIR;
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if (description->is_blocking()) {
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if (!description->can_read()) {
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if (Thread::current()->block<Thread::ReadBlocker>(*description).was_interrupted())
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return -EINTR;
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if (!description->can_read())
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return -EAGAIN;
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}
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}
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// FIXME: We should have a read() that takes a Userspace<u8*>
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return description->read(buffer.unsafe_userspace_ptr(), size);
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}
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}
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