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Cygwin: dll_list: no recursive use of nt_max_path_buf 

Querying the ntlength and existence of the /var/run/cygfork directory in
the very first Cygwin process should not use nt_max_path_buf, as that
one is used by dll_list::alloc already.
This commit is contained in:
Michael Haubenwallner 2019-05-13 16:36:23 +02:00 committed by Corinna Vinschen
parent 6c9ad75a4b
commit a9c27900e3
1 changed files with 9 additions and 4 deletions
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13
winsup/cygwin/forkable.cc
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@ -472,17 +472,21 @@ dll_list::forkable_ntnamesize (dll_type type, PCWCHAR fullntname, PCWCHAR modnam
if (cygwin_shared->forkable_hardlink_support == 0) /* Unknown */
{
/* check existence of forkables dir */
PWCHAR pbuf = nt_max_path_buf ();
/* nt_max_path_buf () is already used in dll_list::alloc.
But as this is run in the very first cygwin process only,
using some heap is not a performance issue here. */
PWCHAR pbuf = (PWCHAR) cmalloc_abort (HEAP_BUF,
NT_MAX_PATH * sizeof (WCHAR));
PWCHAR pnext = pbuf;
for (namepart const *part = forkable_nameparts; part->text; ++part)
{
if (part->textfunc)
pbuf += part->textfunc (pbuf, -1);
pnext += part->textfunc (pnext, -1);
else
pbuf += __small_swprintf (pbuf, L"%W", part->text);
pnext += __small_swprintf (pnext, L"%W", part->text);
if (part->mutex_from_dir)
break; /* up to first mutex-naming dir */
}
pbuf = nt_max_path_buf ();
UNICODE_STRING fn;
RtlInitUnicodeString (&fn, pbuf);
@ -504,6 +508,7 @@ dll_list::forkable_ntnamesize (dll_type type, PCWCHAR fullntname, PCWCHAR modnam
cygwin_shared->forkable_hardlink_support = -1; /* No */
debug_printf ("disabled, missing or not on NTFS %W", fn.Buffer);
}
cfree (pbuf);
}
if (!forkables_supported ())