/*
* vfork_return
*
* Description: "Return" to parent vfork thread() following execve/_exit;
* this is done by reassociating the parent process structure
* with the task, thread, and uthread.
*
* Parameters: child_proc Child process
* retval System call return value array
* rval Return value to present to parent
*
* Returns: void
*
* Note: The caller resumes or exits the parent, as appropriate, after
* callling this function.
*/
void
vfork_return(proc_t child_proc, int32_t *retval, int rval)
{
proc_t parent_proc = child_proc->p_pptr;
thread_t parent_thread = (thread_t)current_thread();
uthread_t parent_uthread = (uthread_t)get_bsdthread_info(parent_thread);
act_thread_catt(parent_uthread->uu_userstate);
/* end vfork in parent */
proc_vfork_end(parent_proc);
/* REPATRIATE PARENT TASK, THREAD, UTHREAD */
parent_uthread->uu_userstate = 0;
parent_uthread->uu_flag &= ~UT_VFORK;
/* restore thread-set-id state */
if (parent_uthread->uu_flag & UT_WASSETUID) {
parent_uthread->uu_flag |= UT_SETUID;
parent_uthread->uu_flag &= UT_WASSETUID;
}
parent_uthread->uu_proc = 0;
parent_uthread->uu_sigmask = parent_uthread->uu_vforkmask;
child_proc->p_lflag &= ~P_LINVFORK;
child_proc->p_vforkact = (void *)0;
thread_set_parent(parent_thread, rval);
if (retval) {
retval[0] = rval;
retval[1] = 0; /* mark parent */
}
return;
}
/*
* vfork_return
*
* Description: "Return" to parent vfork thread() following execve/_exit;
* this is done by reassociating the parent process structure
* with the task, thread, and uthread.
*
* Refer to the ASCII art above vfork() to figure out the
* state we're undoing.
*
* Parameters: child_proc Child process
* retval System call return value array
* rval Return value to present to parent
*
* Returns: void
*
* Notes: The caller resumes or exits the parent, as appropriate, after
* calling this function.
*/
void
vfork_return(proc_t child_proc, int32_t *retval, int rval)
{
task_t parent_task = get_threadtask(child_proc->p_vforkact);
proc_t parent_proc = get_bsdtask_info(parent_task);
thread_t th = current_thread();
uthread_t uth = get_bsdthread_info(th);
act_thread_catt(uth->uu_userstate);
/* clear vfork state in parent proc structure */
proc_vfork_end(parent_proc);
/* REPATRIATE PARENT TASK, THREAD, UTHREAD */
uth->uu_userstate = 0;
uth->uu_flag &= ~UT_VFORK;
/* restore thread-set-id state */
if (uth->uu_flag & UT_WASSETUID) {
uth->uu_flag |= UT_SETUID;
uth->uu_flag &= UT_WASSETUID;
}
uth->uu_proc = 0;
uth->uu_sigmask = uth->uu_vforkmask;
proc_lock(child_proc);
child_proc->p_lflag &= ~P_LINVFORK;
child_proc->p_vforkact = 0;
proc_unlock(child_proc);
thread_set_parent(th, rval);
if (retval) {
retval[0] = rval;
retval[1] = 0; /* mark parent */
}
}
