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e7310ba45a
The function fstatat can do the same thing as the stat and lstat functions. However, it can be passed the file descriptor of a directory which will be used when as the starting point for relative paths. This is contrary to stat and lstat which use the current working directory as the starting for relative paths.
63 lines
1.8 KiB
C++
63 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 <AK/NonnullRefPtrVector.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/FileDescription.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<int> Process::sys$fstat(int fd, Userspace<stat*> user_statbuf)
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{
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REQUIRE_PROMISE(stdio);
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auto description = file_description(fd);
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if (!description)
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return EBADF;
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stat buffer = {};
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int rc = description->stat(buffer);
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if (!copy_to_user(user_statbuf, &buffer))
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return EFAULT;
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return rc;
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}
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KResultOr<int> Process::sys$stat(Userspace<const Syscall::SC_stat_params*> user_params)
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{
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REQUIRE_PROMISE(rpath);
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Syscall::SC_stat_params params;
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if (!copy_from_user(¶ms, user_params))
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return EFAULT;
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auto path = get_syscall_path_argument(params.path);
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if (path.is_error())
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return path.error();
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RefPtr<Custody> base;
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if (params.dirfd == AT_FDCWD) {
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base = current_directory();
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} else {
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auto base_description = file_description(params.dirfd);
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if (!base_description)
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return EBADF;
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if (!base_description->is_directory())
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return ENOTDIR;
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if (!base_description->custody())
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return EINVAL;
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base = base_description->custody();
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}
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auto metadata_or_error = VFS::the().lookup_metadata(path.value(), *base, params.follow_symlinks ? 0 : O_NOFOLLOW_NOERROR);
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if (metadata_or_error.is_error())
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return metadata_or_error.error();
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stat statbuf;
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auto result = metadata_or_error.value().stat(statbuf);
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if (result.is_error())
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return result;
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if (!copy_to_user(params.statbuf, &statbuf))
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return EFAULT;
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return 0;
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}
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}
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