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https://github.com/RGBCube/serenity
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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
46 lines
1.4 KiB
C++
46 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/Process.h>
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namespace Kernel {
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ErrorOr<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(Pledge::stdio);
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if (fds().open_count() + 2 > OpenFileDescriptions::max_open())
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return EMFILE;
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// Reject flags other than O_CLOEXEC, O_NONBLOCK
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if ((flags & (O_CLOEXEC | O_NONBLOCK)) != 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 = TRY(FIFO::try_create(uid()));
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auto reader_fd_allocation = TRY(m_fds.allocate());
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auto writer_fd_allocation = TRY(m_fds.allocate());
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auto reader_description = TRY(fifo->open_direction(FIFO::Direction::Reader));
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auto writer_description = TRY(fifo->open_direction(FIFO::Direction::Writer));
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reader_description->set_readable(true);
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writer_description->set_writable(true);
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if (flags & O_NONBLOCK) {
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reader_description->set_blocking(false);
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writer_description->set_blocking(false);
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}
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m_fds[reader_fd_allocation.fd].set(move(reader_description), fd_flags);
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m_fds[writer_fd_allocation.fd].set(move(writer_description), fd_flags);
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TRY(copy_to_user(&pipefd[0], &reader_fd_allocation.fd));
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TRY(copy_to_user(&pipefd[1], &writer_fd_allocation.fd));
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return 0;
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}
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}
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