mirror of
https://github.com/RGBCube/serenity
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b56646e293
There's no reason for this to use a spinlock. Instead, let's allow threads to block if someone else is using the descriptor table.
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/API/InodeWatcherFlags.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/InodeWatcher.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$create_inode_watcher(u32 flags)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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TRY(require_promise(Pledge::rpath));
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auto fd_allocation = TRY(allocate_fd());
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auto watcher = TRY(InodeWatcher::try_create());
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auto description = TRY(OpenFileDescription::try_create(move(watcher)));
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description->set_readable(true);
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if (flags & static_cast<unsigned>(InodeWatcherFlags::Nonblock))
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description->set_blocking(false);
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return m_fds.with_exclusive([&](auto& fds) -> ErrorOr<FlatPtr> {
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fds[fd_allocation.fd].set(move(description));
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if (flags & static_cast<unsigned>(InodeWatcherFlags::CloseOnExec))
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fds[fd_allocation.fd].set_flags(fds[fd_allocation.fd].flags() | FD_CLOEXEC);
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return fd_allocation.fd;
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});
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}
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ErrorOr<FlatPtr> Process::sys$inode_watcher_add_watch(Userspace<const Syscall::SC_inode_watcher_add_watch_params*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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TRY(require_promise(Pledge::rpath));
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auto params = TRY(copy_typed_from_user(user_params));
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auto description = TRY(open_file_description(params.fd));
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if (!description->is_inode_watcher())
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return EBADF;
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auto* inode_watcher = description->inode_watcher();
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auto path = TRY(get_syscall_path_argument(params.user_path));
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auto custody = TRY(VirtualFileSystem::the().resolve_path(path->view(), current_directory()));
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if (!custody->inode().fs().supports_watchers())
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return ENOTSUP;
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return TRY(inode_watcher->register_inode(custody->inode(), params.event_mask));
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}
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ErrorOr<FlatPtr> Process::sys$inode_watcher_remove_watch(int fd, int wd)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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auto description = TRY(open_file_description(fd));
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if (!description->is_inode_watcher())
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return EBADF;
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TRY(description->inode_watcher()->unregister_by_wd(wd));
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return 0;
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}
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}
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