Function pipe_zone_ctor

freebsd/kern/sys_pipe.c:266–312

}

static int
pipe_zone_ctor(void *mem, int size, void *arg, int flags)
{
	struct pipepair *pp;
	struct pipe *rpipe, *wpipe;

	KASSERT(size == sizeof(*pp), ("pipe_zone_ctor: wrong size"));

	pp = (struct pipepair *)mem;

	/*
	 * We zero both pipe endpoints to make sure all the kmem pointers
	 * are NULL, flag fields are zero'd, etc.  We timestamp both
	 * endpoints with the same time.
	 */
	rpipe = &pp->pp_rpipe;
	bzero(rpipe, sizeof(*rpipe));
	pipe_timestamp(&rpipe->pipe_ctime);
	rpipe->pipe_atime = rpipe->pipe_mtime = rpipe->pipe_ctime;

	wpipe = &pp->pp_wpipe;
	bzero(wpipe, sizeof(*wpipe));
	wpipe->pipe_ctime = rpipe->pipe_ctime;
	wpipe->pipe_atime = wpipe->pipe_mtime = rpipe->pipe_ctime;

	rpipe->pipe_peer = wpipe;
	rpipe->pipe_pair = pp;
	wpipe->pipe_peer = rpipe;
	wpipe->pipe_pair = pp;

	/*
	 * Mark both endpoints as present; they will later get free'd
	 * one at a time.  When both are free'd, then the whole pair
	 * is released.
	 */
	rpipe->pipe_present = PIPE_ACTIVE;
	wpipe->pipe_present = PIPE_ACTIVE;

	/*
	 * Eventually, the MAC Framework may initialize the label
	 * in ctor or init, but for now we do it elswhere to avoid
	 * blocking in ctor or init.
	 */
	pp->pp_label = NULL;

	return (0);
}

static int
pipe_zone_init(void *mem, int size, int flags)