Function racct_proc_fork

freebsd/kern/kern_racct.c:916–969

* Inherit resource usage information from the parent process. */

 * Inherit resource usage information from the parent process.
 */
int
racct_proc_fork(struct proc *parent, struct proc *child)
{
	int i, error = 0;

	if (!racct_enable)
		return (0);

	/*
	 * Create racct for the child process.
	 */
	racct_create(&child->p_racct);

	PROC_LOCK(parent);
	PROC_LOCK(child);
	RACCT_LOCK();

#ifdef RCTL
	error = rctl_proc_fork(parent, child);
	if (error != 0)
		goto out;
#endif

	/* Init process cpu time. */
	child->p_prev_runtime = 0;
	child->p_throttled = 0;

	/*
	 * Inherit resource usage.
	 */
	for (i = 0; i <= RACCT_MAX; i++) {
		if (parent->p_racct->r_resources[i] == 0 ||
		    !RACCT_IS_INHERITABLE(i))
			continue;

		error = racct_set_locked(child, i,
		    parent->p_racct->r_resources[i], 0);
		if (error != 0)
			goto out;
	}

	error = racct_add_locked(child, RACCT_NPROC, 1, 0);
	error += racct_add_locked(child, RACCT_NTHR, 1, 0);

out:
	RACCT_UNLOCK();
	PROC_UNLOCK(child);
	PROC_UNLOCK(parent);

	if (error != 0)
		racct_proc_exit(child);

	return (error);
}

/*
 * Called at the end of fork1(), to handle rules that require the process