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Cygwin: fcntl.h: Define O_TMPFILE and implement it

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Difference to Linux: We can't create files which don't show up
in the filesystem due to OS restrictions.  As a kludge, make a
(half-hearted) attempt to hide the file in the filesystem.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2017-11-14 21:28:45 +01:00
parent f94fe74aad
commit 0aa99373c1
4 changed files with 103 additions and 3 deletions
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39
winsup/cygwin/fhandler_disk_file.cc
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@ -1248,6 +1248,37 @@ fhandler_disk_file::link (const char *newpath)
return -1;
}
}
else if (pc.file_attributes () & FILE_ATTRIBUTE_TEMPORARY)
{
/* If the original file has been opened with O_TMPFILE the file has
FILE_ATTRIBUTE_TEMPORARY set. After a successful hardlink the
file is not temporary anymore in the usual sense. So we remove
FILE_ATTRIBUTE_TEMPORARY here, even if this makes the original file
visible in directory enumeration. */
OBJECT_ATTRIBUTES attr;
status = NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES,
pc.init_reopen_attr (attr, fh), &io,
FILE_SHARE_VALID_FLAGS, FILE_OPEN_FOR_BACKUP_INTENT);
if (!NT_SUCCESS (status))
debug_printf ("Opening for removing TEMPORARY attrib failed, "
"status = %y", status);
else
{
FILE_BASIC_INFORMATION fbi;
fbi.CreationTime.QuadPart = fbi.LastAccessTime.QuadPart
= fbi.LastWriteTime.QuadPart = fbi.ChangeTime.QuadPart = 0LL;
fbi.FileAttributes = (pc.file_attributes ()
& ~FILE_ATTRIBUTE_TEMPORARY)
?: FILE_ATTRIBUTE_NORMAL;
status = NtSetInformationFile (fh, &io, &fbi, sizeof fbi,
FileBasicInformation);
if (!NT_SUCCESS (status))
debug_printf ("Removing the TEMPORARY attrib failed, status = %y",
status);
NtClose (fh);
}
}
return 0;
}
@ -2064,12 +2095,14 @@ fhandler_disk_file::readdir (DIR *dir, dirent *de)
PFILE_ID_BOTH_DIR_INFORMATION buf = NULL;
PWCHAR FileName;
ULONG FileNameLength;
ULONG FileAttributes = 0;
ULONG FileAttributes;
IO_STATUS_BLOCK io;
UNICODE_STRING fname;
/* d_cachepos always refers to the next cache entry to use. If it's 0
we must reload the cache. */
restart:
FileAttributes = 0;
if (d_cachepos (dir) == 0)
{
if ((dir->__flags & dirent_get_d_ino))
@ -2183,6 +2216,10 @@ go_ahead:
FileAttributes =
((PFILE_BOTH_DIR_INFORMATION) buf)->FileAttributes;
}
/* We don't show O_TMPFILE files in the filesystem. This is a kludge,
so we may end up removing this snippet again. */
if (FileAttributes & FILE_ATTRIBUTE_TEMPORARY)
goto restart;
RtlInitCountedUnicodeString (&fname, FileName, FileNameLength);
d_mounts (dir)->check_mount (&fname);
if (de->d_ino == 0 && (dir->__flags & dirent_set_d_ino))