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Kernel+LibC+LibCore+UserspaceEmulator: Implement faccessat(2)

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Co-Authored-By: Daniel Bertalan <dani@danielbertalan.dev>
This commit is contained in:
sin-ack 2022-10-01 12:24:56 +00:00 • committed by Andrew Kaster
parent fa692e13f9
commit 2a502fe232
13 changed files with 89 additions and 39 deletions
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33
Kernel/Syscalls/faccessat.cpp Normal file
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringView.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
namespace Kernel {
ErrorOr<FlatPtr> Process::sys$faccessat(Userspace<Syscall::SC_faccessat_params const*> user_params)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
TRY(require_promise(Pledge::rpath));
auto params = TRY(copy_typed_from_user(user_params));
auto pathname = TRY(get_syscall_path_argument(params.pathname));
if ((params.flags & ~(AT_SYMLINK_NOFOLLOW | AT_EACCESS)) != 0)
return EINVAL;
auto flags = AccessFlags::None;
if (params.flags & AT_SYMLINK_NOFOLLOW)
flags |= AccessFlags::DoNotFollowSymlinks;
if (params.flags & AT_EACCESS)
flags |= AccessFlags::EffectiveAccess;
TRY(VirtualFileSystem::the().access(credentials(), pathname->view(), params.mode, TRY(custody_for_dirfd(params.dirfd)), flags));
return 0;
}
}