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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/FileSystem/FIFO.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<int> Process::sys$pipe(int pipefd[2], int flags)
{
REQUIRE_PROMISE(stdio);
if (number_of_open_file_descriptors() + 2 > max_open_file_descriptors())
return EMFILE;
// Reject flags other than O_CLOEXEC.
if ((flags & O_CLOEXEC) != flags)
return EINVAL;
u32 fd_flags = (flags & O_CLOEXEC) ? FD_CLOEXEC : 0;
auto fifo = FIFO::create(uid());
auto open_reader_result = fifo->open_direction(FIFO::Direction::Reader);
if (open_reader_result.is_error())
return open_reader_result.error();
auto open_writer_result = fifo->open_direction(FIFO::Direction::Writer);
if (open_writer_result.is_error())
return open_writer_result.error();
int reader_fd = alloc_fd();
m_fds[reader_fd].set(open_reader_result.release_value(), fd_flags);
m_fds[reader_fd].description()->set_readable(true);
if (!copy_to_user(&pipefd[0], &reader_fd))
return EFAULT;
int writer_fd = alloc_fd();
m_fds[writer_fd].set(open_writer_result.release_value(), fd_flags);
m_fds[writer_fd].description()->set_writable(true);
if (!copy_to_user(&pipefd[1], &writer_fd))
return EFAULT;
return 0;
}
}
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