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* dcrt0.cc (child_info_spawn::handle_spawn): Call fixup_lockf_after_exec 

with additional argument to specify if the process has been execed
	or spawned.
	* flock.cc (fixup_lockf_after_exec): Take bool parameter to handle
	exec and spawn differently.  In case of spawn, just give up POSIX
	locks in favor of the still running parent.  Add comments to explain.
This commit is contained in:
Corinna Vinschen 2014-02-10 10:45:51 +00:00
parent 2f850d402e
commit 127cfd4f5a
3 changed files with 33 additions and 8 deletions
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9
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,12 @@
2014-02-10 Corinna Vinschen <corinna@vinschen.de>
* dcrt0.cc (child_info_spawn::handle_spawn): Call fixup_lockf_after_exec
with additional argument to specify if the process has been execed
or spawned.
* flock.cc (fixup_lockf_after_exec): Take bool parameter to handle
exec and spawn differently. In case of spawn, just give up POSIX
locks in favor of the still running parent. Add comments to explain.
2014-02-09 Christopher Faylor <me.cygwin2014@cgf.cx>
* environ.cc (strbrk): Properly deal with environment variable sans

4
winsup/cygwin/dcrt0.cc
View File

@ -655,7 +655,7 @@ child_info_spawn::get_parent_handle ()
void
child_info_spawn::handle_spawn ()
{
extern void fixup_lockf_after_exec ();
extern void fixup_lockf_after_exec (bool);
HANDLE h;
if (!dynamically_loaded || get_parent_handle ())
{
@ -706,7 +706,7 @@ child_info_spawn::handle_spawn ()
}
signal_fixup_after_exec ();
fixup_lockf_after_exec ();
fixup_lockf_after_exec (type == _CH_EXEC);
}
/* Retrieve and store system directory for later use. Note that the

28
winsup/cygwin/flock.cc
View File

@ -439,7 +439,7 @@ fhandler_base::del_my_locks (del_lock_called_from from)
wait on. If the node has been abandoned due to close_on_exec on the
referencing fhandlers, remove the inode entirely. */
void
fixup_lockf_after_exec ()
fixup_lockf_after_exec (bool exec)
{
inode_t *node, *next_node;
@ -464,13 +464,29 @@ fixup_lockf_after_exec ()
else
{
node->LOCK ();
for (lockf_t *lock = node->i_lockf; lock; lock = lock->lf_next)
lockf_t *lock, *n_lock;
lockf_t **prev = &node->i_lockf;
for (lock = *prev; lock && (n_lock = lock->lf_next, 1); lock = n_lock)
if (lock->lf_flags & F_POSIX)
{
lock->del_lock_obj (NULL);
lock->lf_wid = myself->dwProcessId;
lock->lf_ver = 0;
lock->create_lock_obj ();
if (exec)
{
/* The parent called exec. The lock is passed to the child.
Recreate lock object with changed ownership. */
lock->del_lock_obj (NULL);
lock->lf_wid = myself->dwProcessId;
lock->lf_ver = 0;
lock->create_lock_obj ();
}
else
{
/* The parent called spawn. The parent continues to hold
the POSIX lock, ownership is not passed to the child.
Give up the lock in the child. */
*prev = n_lock;
lock->close_lock_obj ();
delete lock;
}
}
node->UNLOCK ();
}