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https://github.com/RGBCube/serenity
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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
65 lines
2.2 KiB
C++
65 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$create_inode_watcher(u32 flags)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::rpath);
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auto fd_allocation = TRY(m_fds.allocate());
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auto watcher = TRY(InodeWatcher::try_create());
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auto description = TRY(OpenFileDescription::try_create(move(watcher)));
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description->set_readable(true);
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if (flags & static_cast<unsigned>(InodeWatcherFlags::Nonblock))
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description->set_blocking(false);
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m_fds[fd_allocation.fd].set(move(description));
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if (flags & static_cast<unsigned>(InodeWatcherFlags::CloseOnExec))
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m_fds[fd_allocation.fd].set_flags(m_fds[fd_allocation.fd].flags() | FD_CLOEXEC);
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return fd_allocation.fd;
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}
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ErrorOr<FlatPtr> Process::sys$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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require_promise(Pledge::rpath);
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auto params = TRY(copy_typed_from_user(user_params));
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auto description = TRY(fds().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(fds().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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