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61 lines
2.4 KiB
C++
61 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/FIFO.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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int Process::sys$pipe(int pipefd[2], int flags)
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{
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REQUIRE_PROMISE(stdio);
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if (!validate_write_typed(pipefd))
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return -EFAULT;
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if (number_of_open_file_descriptors() + 2 > max_open_file_descriptors())
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return -EMFILE;
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// Reject flags other than O_CLOEXEC.
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if ((flags & O_CLOEXEC) != flags)
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return -EINVAL;
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u32 fd_flags = (flags & O_CLOEXEC) ? FD_CLOEXEC : 0;
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auto fifo = FIFO::create(m_uid);
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int reader_fd = alloc_fd();
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m_fds[reader_fd].set(fifo->open_direction(FIFO::Direction::Reader), fd_flags);
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m_fds[reader_fd].description()->set_readable(true);
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copy_to_user(&pipefd[0], &reader_fd);
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int writer_fd = alloc_fd();
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m_fds[writer_fd].set(fifo->open_direction(FIFO::Direction::Writer), fd_flags);
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m_fds[writer_fd].description()->set_writable(true);
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copy_to_user(&pipefd[1], &writer_fd);
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return 0;
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}
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}
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