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1123af361d
This API now returns a KResultOr<NonnullOwnPtr<KString>> and allocation failures should be propagated everywhere nicely. :^)
93 lines
2.7 KiB
C++
93 lines
2.7 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/FileDescription.h>
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#include <Kernel/FileSystem/InodeWatcher.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<int> Process::sys$create_inode_watcher(u32 flags)
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{
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REQUIRE_PROMISE(rpath);
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int fd = alloc_fd();
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if (fd < 0)
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return fd;
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auto watcher_or_error = InodeWatcher::create();
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if (watcher_or_error.is_error())
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return watcher_or_error.error();
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auto description_or_error = FileDescription::create(*watcher_or_error.value());
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if (description_or_error.is_error())
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return description_or_error.error();
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m_fds[fd].set(description_or_error.release_value());
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m_fds[fd].description()->set_readable(true);
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if (flags & static_cast<unsigned>(InodeWatcherFlags::Nonblock))
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m_fds[fd].description()->set_blocking(false);
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if (flags & static_cast<unsigned>(InodeWatcherFlags::CloseOnExec))
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m_fds[fd].set_flags(m_fds[fd].flags() | FD_CLOEXEC);
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return fd;
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}
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KResultOr<int> Process::sys$inode_watcher_add_watch(Userspace<const Syscall::SC_inode_watcher_add_watch_params*> user_params)
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{
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REQUIRE_PROMISE(rpath);
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Syscall::SC_inode_watcher_add_watch_params params;
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if (!copy_from_user(¶ms, user_params))
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return EFAULT;
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auto description = file_description(params.fd);
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if (!description)
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return EBADF;
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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 = get_syscall_path_argument(params.user_path.characters, params.user_path.length);
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if (path.is_error())
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return path.error();
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auto custody_or_error = VFS::the().resolve_path(path.value()->view(), current_directory());
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto& custody = custody_or_error.value();
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if (!custody->inode().fs().supports_watchers())
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return ENOTSUP;
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auto wd_or_error = inode_watcher->register_inode(custody->inode(), params.event_mask);
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if (wd_or_error.is_error())
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return wd_or_error.error();
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return wd_or_error.value();
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}
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KResultOr<int> Process::sys$inode_watcher_remove_watch(int fd, int wd)
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{
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auto description = file_description(fd);
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if (!description)
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return EBADF;
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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 result = inode_watcher->unregister_by_wd(wd);
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if (result.is_error())
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return result;
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return 0;
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}
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}
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