mirror of
https://github.com/SerenityOS/serenity
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58 lines
1.8 KiB
C++
58 lines
1.8 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/Tasks/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$pipe(Userspace<int*> pipefd, int flags)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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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 credentials = this->credentials();
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auto fifo = TRY(FIFO::try_create(credentials->uid()));
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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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TRY(m_fds.with_exclusive([&](auto& fds) -> ErrorOr<void> {
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auto reader_fd_allocation = TRY(fds.allocate());
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auto writer_fd_allocation = TRY(fds.allocate());
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fds[reader_fd_allocation.fd].set(move(reader_description), fd_flags);
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fds[writer_fd_allocation.fd].set(move(writer_description), fd_flags);
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int fds_for_userspace[2] = {
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reader_fd_allocation.fd,
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writer_fd_allocation.fd,
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};
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if (copy_n_to_user(pipefd, fds_for_userspace, 2).is_error()) {
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// Avoid leaking both file descriptors on error.
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fds[reader_fd_allocation.fd] = {};
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fds[writer_fd_allocation.fd] = {};
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return EFAULT;
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}
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return {};
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}));
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return 0;
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}
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}
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