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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<FlatPtr> Process::sys$chdir(Userspace<const char*> user_path, size_t path_length)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
REQUIRE_PROMISE(rpath);
auto path = get_syscall_path_argument(user_path, path_length);
if (path.is_error())
return path.error();
auto directory_or_error = VirtualFileSystem::the().open_directory(path.value()->view(), current_directory());
if (directory_or_error.is_error())
return directory_or_error.error();
m_cwd = *directory_or_error.value();
return 0;
}
KResultOr<FlatPtr> Process::sys$fchdir(int fd)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
REQUIRE_PROMISE(stdio);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (!description->is_directory())
return ENOTDIR;
if (!description->metadata().may_execute(*this))
return EACCES;
m_cwd = description->custody();
return 0;
}
KResultOr<FlatPtr> Process::sys$getcwd(Userspace<char*> buffer, size_t size)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
REQUIRE_PROMISE(rpath);
if (size > NumericLimits<ssize_t>::max())
return EINVAL;
auto maybe_path = current_directory().try_create_absolute_path();
if (!maybe_path)
return ENOMEM;
auto& path = *maybe_path;
size_t ideal_size = path.length() + 1;
auto size_to_copy = min(ideal_size, size);
if (!copy_to_user(buffer, path.characters(), size_to_copy))
return EFAULT;
// Note: we return the whole size here, not the copied size.
return ideal_size;
}
}
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