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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
48 lines
1.4 KiB
C++
48 lines
1.4 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/FileSystem/FileDescription.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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int reader_fd = m_fds.allocate();
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m_fds[reader_fd].set(open_reader_result.release_value(), fd_flags);
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m_fds[reader_fd].description()->set_readable(true);
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if (!copy_to_user(&pipefd[0], &reader_fd))
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return EFAULT;
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int writer_fd = m_fds.allocate();
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m_fds[writer_fd].set(open_writer_result.release_value(), fd_flags);
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m_fds[writer_fd].description()->set_writable(true);
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if (!copy_to_user(&pipefd[1], &writer_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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