mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-11 13:36:13 +03:00
62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/RefPtr.h>
|
|
#include <Kernel/FileSystem/Custody.h>
|
|
#include <Kernel/FileSystem/VirtualFileSystem.h>
|
|
#include <Kernel/Tasks/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
ErrorOr<FlatPtr> Process::sys$chdir(Userspace<char const*> user_path, size_t path_length)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
TRY(require_promise(Pledge::rpath));
|
|
auto path = TRY(get_syscall_path_argument(user_path, path_length));
|
|
auto current_directory = m_current_directory.with([](auto& current_directory) -> NonnullRefPtr<Custody> {
|
|
return *current_directory;
|
|
});
|
|
RefPtr<Custody> new_directory = TRY(VirtualFileSystem::the().open_directory(credentials(), path->view(), *current_directory));
|
|
m_current_directory.with([&](auto& current_directory) {
|
|
// NOTE: We use swap() here to avoid manipulating the ref counts while holding the lock.
|
|
swap(current_directory, new_directory);
|
|
});
|
|
return 0;
|
|
}
|
|
|
|
ErrorOr<FlatPtr> Process::sys$fchdir(int fd)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
TRY(require_promise(Pledge::stdio));
|
|
auto description = TRY(open_file_description(fd));
|
|
if (!description->is_directory())
|
|
return ENOTDIR;
|
|
if (!description->metadata().may_execute(credentials()))
|
|
return EACCES;
|
|
m_current_directory.with([&](auto& current_directory) {
|
|
current_directory = description->custody();
|
|
});
|
|
return 0;
|
|
}
|
|
|
|
ErrorOr<FlatPtr> Process::sys$getcwd(Userspace<char*> buffer, size_t size)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
TRY(require_promise(Pledge::rpath));
|
|
|
|
if (size > NumericLimits<ssize_t>::max())
|
|
return EINVAL;
|
|
|
|
auto path = TRY(current_directory()->try_serialize_absolute_path());
|
|
size_t ideal_size = path->length() + 1;
|
|
auto size_to_copy = min(ideal_size, size);
|
|
TRY(copy_to_user(buffer, path->characters(), size_to_copy));
|
|
// Note: we return the whole size here, not the copied size.
|
|
return ideal_size;
|
|
}
|
|
|
|
}
|