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7a3ab6c517
Instead of returning a ssize_t where negative values mean error, we now return KResultOr<size_t> and use the error state to report errors exclusively.
133 lines
4.3 KiB
C++
133 lines
4.3 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 <AK/NumericLimits.h>
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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$writev(int fd, const struct iovec* iov, int iov_count)
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{
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REQUIRE_PROMISE(stdio);
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if (iov_count < 0)
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return -EINVAL;
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if (!validate_read_typed(iov, iov_count))
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return -EFAULT;
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u64 total_length = 0;
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Vector<iovec, 32> vecs;
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vecs.resize(iov_count);
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copy_from_user(vecs.data(), iov, iov_count * sizeof(iovec));
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for (auto& vec : vecs) {
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if (!validate_read(vec.iov_base, vec.iov_len))
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return -EFAULT;
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total_length += vec.iov_len;
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if (total_length > NumericLimits<i32>::max())
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return -EINVAL;
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}
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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_writable())
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return -EBADF;
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int nwritten = 0;
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for (auto& vec : vecs) {
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int rc = do_write(*description, (const u8*)vec.iov_base, vec.iov_len);
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if (rc < 0) {
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if (nwritten == 0)
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return rc;
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return nwritten;
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}
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nwritten += rc;
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}
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return nwritten;
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}
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ssize_t Process::do_write(FileDescription& description, const u8* data, int data_size)
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{
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ssize_t total_nwritten = 0;
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if (!description.is_blocking()) {
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if (!description.can_write())
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return -EAGAIN;
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}
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if (description.should_append())
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description.seek(0, SEEK_END);
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while (total_nwritten < data_size) {
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if (!description.can_write()) {
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if (!description.is_blocking()) {
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// Short write: We can no longer write to this non-blocking description.
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ASSERT(total_nwritten > 0);
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return total_nwritten;
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}
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if (Thread::current()->block<Thread::WriteBlocker>(nullptr, description).was_interrupted()) {
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if (total_nwritten == 0)
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return -EINTR;
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}
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}
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auto nwritten_or_error = description.write(data + total_nwritten, data_size - total_nwritten);
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if (nwritten_or_error.is_error()) {
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if (total_nwritten)
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return total_nwritten;
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return nwritten_or_error.error();
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}
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if (nwritten_or_error.value() == 0)
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break;
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total_nwritten += nwritten_or_error.value();
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}
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return total_nwritten;
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}
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ssize_t Process::sys$write(int fd, const u8* data, 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_read(data, size))
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return -EFAULT;
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#ifdef DEBUG_IO
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dbg() << "sys$write(" << fd << ", " << (const void*)(data) << ", " << 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_writable())
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return -EBADF;
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return do_write(*description, data, size);
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}
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}
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