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* syscalls.cc (unlink): Attempt to be more clever about setting attributes of

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file.  Only open file in query mode to avoid having to mess with security stuff
for reading.
This commit is contained in:
Christopher Faylor 2003-03-09 18:10:42 +00:00
parent c379f2ed07
commit 36c4a441f6
2 changed files with 30 additions and 12 deletions
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6
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,9 @@
2003-03-09 Christopher Faylor <cgf@redhat.com>
* syscalls.cc (unlink): Attempt to be more clever about setting
attributes of file. Only open file in query mode to avoid having to
mess with security stuff for reading.
2003-03-09 Corinna Vinschen <corinna@vinschen.de>
* rmsym: Fix regular expression.

36
winsup/cygwin/syscalls.cc
View File

@ -130,36 +130,48 @@ unlink (const char *ourname)
if (!writable_directory (win32_name))
{
syscall_printf ("non-writable directory");
set_errno (EPERM);
goto done;
}
/* Allow us to delete even if read-only */
SetFileAttributes (win32_name, (DWORD) win32_name & ~(FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM));
/* Attempt to use "delete on close" semantics to handle removing
a file which may be open. */
HANDLE h;
h = CreateFile (win32_name, GENERIC_READ, FILE_SHARE_DELETE, &sec_none_nih,
h = CreateFile (win32_name, 0, FILE_SHARE_READ, &sec_none_nih,
OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE, 0);
(void) SetFileAttributes (win32_name, (DWORD) win32_name);
(void) DeleteFile (win32_name);
DWORD lasterr;
lasterr = GetLastError ();
if (h != INVALID_HANDLE_VALUE)
CloseHandle (h);
if (GetFileAttributes (win32_name) == INVALID_FILE_ATTRIBUTES
|| (!win32_name.isremote () && wincap.has_delete_on_close ()))
{
syscall_printf ("DeleteFile succeeded");
goto ok;
(void) SetFileAttributes (win32_name, (DWORD) win32_name);
BOOL res = CloseHandle (h);
syscall_printf ("%d = CloseHandle (%p)", res, h);
if (GetFileAttributes (win32_name) == INVALID_FILE_ATTRIBUTES
|| (!win32_name.isremote () && wincap.has_delete_on_close ()))
{
syscall_printf ("CreateFile (FILE_FLAG_DELETE_ON_CLOSE) succeeded");
goto ok;
}
else
{
syscall_printf ("CreateFile (FILE_FLAG_DELETE_ON_CLOSE) failed");
SetFileAttributes (win32_name, (DWORD) win32_name & ~(FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM));
}
}
/* Try a delete with attributes reset */
if (DeleteFile (win32_name))
{
syscall_printf ("DeleteFile after CreateFile/ClosHandle succeeded");
goto ok;
}
DWORD lasterr;
lasterr = GetLastError ();
(void) SetFileAttributes (win32_name, (DWORD) win32_name);
/* Windows 9x seems to report ERROR_ACCESS_DENIED rather than sharing
violation. So, set lasterr to ERROR_SHARING_VIOLATION in this case
to simplify tests. */