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