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112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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int Process::sys$open(Userspace<const Syscall::SC_open_params*> user_params)
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{
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Syscall::SC_open_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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int dirfd = params.dirfd;
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int options = params.options;
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u16 mode = params.mode;
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if (options & O_NOFOLLOW_NOERROR)
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return -EINVAL;
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if (options & O_UNLINK_INTERNAL)
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return -EINVAL;
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if (options & O_WRONLY)
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REQUIRE_PROMISE(wpath);
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else if (options & O_RDONLY)
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REQUIRE_PROMISE(rpath);
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if (options & O_CREAT)
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REQUIRE_PROMISE(cpath);
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// Ignore everything except permission bits.
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mode &= 04777;
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auto path = get_syscall_path_argument(params.path);
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if (path.is_error())
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return path.error();
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#ifdef DEBUG_IO
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dbg() << "sys$open(dirfd=" << dirfd << ", path=\"" << path.value() << "\", options=" << options << ", mode=" << mode << ")";
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#endif
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int fd = alloc_fd();
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if (fd < 0)
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return fd;
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RefPtr<Custody> base;
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if (dirfd == AT_FDCWD) {
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base = current_directory();
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} else {
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auto base_description = file_description(dirfd);
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if (!base_description)
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return -EBADF;
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if (!base_description->is_directory())
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return -ENOTDIR;
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if (!base_description->custody())
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return -EINVAL;
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base = base_description->custody();
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}
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auto result = VFS::the().open(path.value(), options, mode & ~umask(), *base);
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if (result.is_error())
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return result.error();
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auto description = result.value();
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if (description->inode() && description->inode()->socket())
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return -ENXIO;
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u32 fd_flags = (options & O_CLOEXEC) ? FD_CLOEXEC : 0;
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m_fds[fd].set(move(description), fd_flags);
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return fd;
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}
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int Process::sys$close(int fd)
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{
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REQUIRE_PROMISE(stdio);
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auto description = file_description(fd);
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#ifdef DEBUG_IO
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dbg() << "sys$close(" << fd << ") " << description.ptr();
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#endif
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if (!description)
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return -EBADF;
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int rc = description->close();
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m_fds[fd] = {};
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return rc;
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}
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}
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