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* dtable.cc (dtable::find_unused_handle): Fix off-by-one error. Always exit

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through the bottom.
(cygwin_attach_handle_to_fd): Make sure that fd tab is locked for the duration
of this function.
* dtable.h (dtable::lock): Make public.
(dtable::unlock): Ditto.
(dtable): Remove friends.
This commit is contained in:
Christopher Faylor
2013-12-01 17:52:48 +00:00
parent 10a5939224
commit f456b9f6f8
3 changed files with 29 additions and 18 deletions
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24
winsup/cygwin/dtable.cc
View File

@@ -223,17 +223,22 @@ dtable::delete_archetype (fhandler_base *fh)
int
dtable::find_unused_handle (size_t start)
{
size_t extendby = (start > size) ? start - size : NOFILE_INCR;
size_t extendby = (start >= size) ? 1 + start - size : NOFILE_INCR;
/* This do loop should only ever execute twice. */
int res = -1;
do
{
for (size_t i = start; i < size; i++)
/* See if open -- no need for overhead of not_open */
if (fds[i] == NULL)
return i;
{
res = (int) i;
break;
}
}
while (extend (extendby));
return -1;
return res;
}
void
@@ -251,14 +256,19 @@ extern "C" int
cygwin_attach_handle_to_fd (char *name, int fd, HANDLE handle, mode_t bin,
DWORD myaccess)
{
cygheap->fdtab.lock ();
if (fd == -1)
fd = cygheap->fdtab.find_unused_handle ();
fhandler_base *fh = build_fh_name (name);
if (!fh)
return -1;
cygheap->fdtab[fd] = fh;
cygheap->fdtab[fd]->inc_refcnt ();
fh->init (handle, myaccess, bin ?: fh->pc_binmode ());
fd = -1;
else
{
cygheap->fdtab[fd] = fh;
cygheap->fdtab[fd]->inc_refcnt ();
fh->init (handle, myaccess, bin ?: fh->pc_binmode ());
}
cygheap->fdtab.unlock ();
return fd;
}