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Kernel+LibC: Add fstatat

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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.
This commit is contained in:
Mart G 2021-05-14 20:34:31 +02:00 • committed by Andreas Kling
parent 875116c3e5
commit e7310ba45a
6 changed files with 29 additions and 5 deletions
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16
Kernel/Syscalls/stat.cpp
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@ -5,6 +5,7 @@
*/
#include <AK/NonnullRefPtrVector.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
@ -33,7 +34,20 @@ KResultOr<int> Process::sys$stat(Userspace<const Syscall::SC_stat_params*> user_
auto path = get_syscall_path_argument(params.path);
if (path.is_error())
return path.error();
auto metadata_or_error = VFS::the().lookup_metadata(path.value(), current_directory(), params.follow_symlinks ? 0 : O_NOFOLLOW_NOERROR);
RefPtr<Custody> base;
if (params.dirfd == AT_FDCWD) {
base = current_directory();
} else {
auto base_description = file_description(params.dirfd);
if (!base_description)
return EBADF;
if (!base_description->is_directory())
return ENOTDIR;
if (!base_description->custody())
return EINVAL;
base = base_description->custody();
}
auto metadata_or_error = VFS::the().lookup_metadata(path.value(), *base, params.follow_symlinks ? 0 : O_NOFOLLOW_NOERROR);
if (metadata_or_error.is_error())
return metadata_or_error.error();
stat statbuf;