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51 lines
1.5 KiB
C++
51 lines
1.5 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$chdir(Userspace<const char*> user_path, size_t path_length)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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REQUIRE_PROMISE(rpath);
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auto path = TRY(get_syscall_path_argument(user_path, path_length));
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m_cwd = TRY(VirtualFileSystem::the().open_directory(path->view(), current_directory()));
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return 0;
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}
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KResultOr<FlatPtr> Process::sys$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 = TRY(fds().open_file_description(fd));
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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 path = TRY(current_directory().try_serialize_absolute_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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TRY(copy_to_user(buffer, path->characters(), size_to_copy));
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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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