mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 19:42:43 +00:00
56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/FileSystem/FIFO.h>
|
|
#include <Kernel/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
KResultOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
|
|
{
|
|
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
|
|
REQUIRE_PROMISE(stdio);
|
|
if (fds().open_count() + 2 > fds().max_open())
|
|
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::try_create(uid());
|
|
if (!fifo)
|
|
return ENOMEM;
|
|
|
|
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();
|
|
|
|
auto reader_fd_or_error = m_fds.allocate();
|
|
if (reader_fd_or_error.is_error())
|
|
return reader_fd_or_error.error();
|
|
auto reader_fd = reader_fd_or_error.release_value();
|
|
m_fds[reader_fd.fd].set(open_reader_result.release_value(), fd_flags);
|
|
m_fds[reader_fd.fd].description()->set_readable(true);
|
|
if (!copy_to_user(&pipefd[0], &reader_fd.fd))
|
|
return EFAULT;
|
|
|
|
auto writer_fd_or_error = m_fds.allocate();
|
|
if (writer_fd_or_error.is_error())
|
|
return writer_fd_or_error.error();
|
|
auto writer_fd = writer_fd_or_error.release_value();
|
|
m_fds[writer_fd.fd].set(open_writer_result.release_value(), fd_flags);
|
|
m_fds[writer_fd.fd].description()->set_writable(true);
|
|
|
|
if (!copy_to_user(&pipefd[1], &writer_fd.fd))
|
|
return EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
}
|