mirror of
https://github.com/SerenityOS/serenity
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55 lines
1.7 KiB
C++
55 lines
1.7 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/FileSystem/FIFO.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(stdio);
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if (fds().open_count() + 2 > fds().max_open())
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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(uid());
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auto open_reader_result = fifo->open_direction(FIFO::Direction::Reader);
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if (open_reader_result.is_error())
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return open_reader_result.error();
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auto open_writer_result = fifo->open_direction(FIFO::Direction::Writer);
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if (open_writer_result.is_error())
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return open_writer_result.error();
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auto reader_fd_or_error = m_fds.allocate();
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if (reader_fd_or_error.is_error())
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return reader_fd_or_error.error();
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auto reader_fd = reader_fd_or_error.release_value();
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m_fds[reader_fd.fd].set(open_reader_result.release_value(), fd_flags);
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m_fds[reader_fd.fd].description()->set_readable(true);
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if (!copy_to_user(&pipefd[0], &reader_fd.fd))
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return EFAULT;
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auto writer_fd_or_error = m_fds.allocate();
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if (writer_fd_or_error.is_error())
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return writer_fd_or_error.error();
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auto writer_fd = writer_fd_or_error.release_value();
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m_fds[writer_fd.fd].set(open_writer_result.release_value(), fd_flags);
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m_fds[writer_fd.fd].description()->set_writable(true);
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if (!copy_to_user(&pipefd[1], &writer_fd.fd))
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return EFAULT;
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return 0;
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}
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}
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