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https://github.com/SerenityOS/serenity
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a9204510a4
Instead of checking it at every call site (to generate EBADF), we make file_description(fd) return a KResultOr<NonnullRefPtr<FileDescription>>. This allows us to wrap all the calls in TRY(). :^) The only place that got a little bit messier from this is sys$mount(), and there's a whole bunch of things there in need of cleanup.
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$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$fchdir(int fd)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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REQUIRE_PROMISE(stdio);
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auto description = TRY(fds().file_description(fd));
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if (!description->is_directory())
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return ENOTDIR;
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if (!description->metadata().may_execute(*this))
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return EACCES;
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m_cwd = description->custody();
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return 0;
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}
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KResultOr<FlatPtr> Process::sys$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 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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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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