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* syscalls.cc (rmdir): Set cwd to some other location if attempting to rmdir

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current working directory.
This commit is contained in:
Christopher Faylor
2001-09-17 18:10:02 +00:00
parent 3e985c99c0
commit 8238a68bb2
3 changed files with 42 additions and 2 deletions
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5
winsup/cygwin/ChangeLog
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@@ -1,3 +1,8 @@
Mon Sep 17 14:04:27 2001 Christopher Faylor <cgf@cygnus.com>
* syscalls.cc (rmdir): Set cwd to some other location if attempting to
rmdir current working directory.
Sun Sep 16 23:04:31 2001 Christopher Faylor <cgf@cygnus.com>
* dtable.h (not_open): Assure inline.

21
winsup/cygwin/dir.cc
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@@ -401,8 +401,29 @@ rmdir (const char *dir)
}
else
{
/* This kludge detects if we are attempting to remove the current working
directory. If so, we will move elsewhere to potentially allow the
rmdir to succeed. This means that cygwin's concept of the current working
directory != Windows concept but, hey, whaddaregonnado?
Note that this will not cause something like the following to work:
$ cd foo
$ rmdir .
since the shell will have foo "open" in the above case and so Windows will
not allow the deletion.
FIXME: A potential workaround for this is for cygwin apps to *never* call
SetCurrentDirectory. */
if (strcasematch (real_dir, cygheap->cwd.win32)
&& !strcasematch ("c:\\", cygheap->cwd.win32))
{
DWORD err = GetLastError ();
if (!SetCurrentDirectory ("c:\\"))
SetLastError (err);
else
return rmdir (dir);
}
if (GetLastError() == ERROR_ACCESS_DENIED)
{
/* On 9X ERROR_ACCESS_DENIED is returned if you try to remove
a non-empty directory. */
if (wincap.access_denied_on_delete ())

18
winsup/cygwin/how-signals-work.txt
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@@ -1,7 +1,5 @@
Copyright 2001 Red Hat Inc., Christopher Faylor
[This is not yet complete. -cgf]
How do signals work?
On process startup, cygwin starts a secondary thread that deals with signals.
@@ -111,3 +109,19 @@ arrival is more or less maintained. It checks to see if a cygwin
routine has set a special "restore this errno on returning from a
signal" value and sets errno to this, if so. Finally, it restores all
of the register values that were in effect when sigdelayed was called.
Ok, you thought I had forgotten about the 'pending' stuff didn't you?
Well, if you can rewind up to the discussion of sig_handle we'll return
to the situation where sigsave was currently active. In this case,
setup_handler will set a "pending" flag, will reincrement the appropriate
element of the above signal array, and will return 0 to indicate that
the interrupt did not occur. Otherwise setup_handler returns 1.
For pending signals, the theory is that the signal handler thread will
be forced to be rerun by having some strategic cygwin function call
sig_send with a __SIGFLUSH argument. This causes the signal handler
to rescan the signal array looking for pending signals.
This leads us to the sig_send function. This is the "client side" part
of the signal manipulation process. sig_send is the low-level function
called by a high level process like kill().