int sig_dispatch(pid_t pid, FAR siginfo_t *info)
{
#ifdef HAVE_GROUP_MEMBERS
FAR struct tcb_s *stcb;
FAR struct task_group_s *group;
/* Get the TCB associated with the pid */
stcb = sched_gettcb(pid);
if (stcb)
{
/* The task/thread associated with this PID is still active. Get its
* task group.
*/
group = stcb->group;
}
else
{
/* The task/thread associated with this PID has exited. In the normal
* usage model, the PID should correspond to the PID of the task that
* created the task group. Try looking it up.
*/
group = group_findbypid(pid);
}
/* Did we locate the group? */
if (group)
{
/* Yes.. call group_signal() to send the signal to the correct group
* member.
*/
return group_signal(group, info);
}
else
{
return -ESRCH;
}
#else
FAR struct tcb_s *stcb;
/* Get the TCB associated with the pid */
stcb = sched_gettcb(pid);
if (!stcb)
{
return -ESRCH;
}
return sig_tcbdispatch(stcb, info);
#endif
}
static inline void task_sigchild(gid_t pgid, FAR struct tcb_s *ctcb, int status)
{
FAR struct task_group_s *chgrp = ctcb->group;
FAR struct task_group_s *pgrp;
siginfo_t info;
DEBUGASSERT(chgrp);
/* Get the parent task group. It is possible that all of the members of
* the parent task group have exited. This would not be an error. In
* this case, the child task group has been orphaned.
*/
pgrp = group_findbygid(pgid);
if (!pgrp)
{
/* Set the task group ID to an invalid group ID. The dead parent
* task group ID could get reused some time in the future.
*/
chgrp->tg_pgid = INVALID_GROUP_ID;
return;
}
/* Save the exit status now if this is the main thread of the task group
* that is exiting. Only the exiting main task of a task group carries
* interpretable exit Check if this is the main task that is exiting.
*/
#ifndef CONFIG_DISABLE_PTHREAD
if ((ctcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD)
#endif
{
task_exitstatus(pgrp, status);
}
/* But only the final exiting thread in a task group, whatever it is,
* should generate SIGCHLD.
*/
if (chgrp->tg_nmembers == 1)
{
/* Mark that all of the threads in the task group have exited */
task_groupexit(pgrp);
/* Create the siginfo structure. We don't actually know the cause.
* That is a bug. Let's just say that the child task just exited
* for now.
*/
info.si_signo = SIGCHLD;
info.si_code = CLD_EXITED;
info.si_errno = OK;
info.si_value.sival_ptr = NULL;
#ifndef CONFIG_DISABLE_PTHREAD
info.si_pid = chgrp->tg_task;
#else
info.si_pid = ctcb->pid;
#endif
info.si_status = status;
/* Send the signal to one thread in the group */
(void)group_signal(pgrp, &info);
}
}
