C++ MAGIC_CHECK函数代码示例

void videobuf_vmalloc_free(struct videobuf_buffer *buf)
{
	struct videobuf_vmalloc_memory *mem = buf->priv;

	/* mmapped memory can't be freed here, otherwise mmapped region
	   would be released, while still needed. In this case, the memory
	   release should happen inside videobuf_vm_close().
	   So, it should free memory only if the memory were allocated for
	   read() operation.
	 */
	if ((buf->memory != V4L2_MEMORY_USERPTR) || buf->baddr)
		return;

	if (!mem)
		return;

	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);

	vfree(mem->vaddr);
	mem->vaddr = NULL;

	return;
}

static int __videobuf_iolock(struct videobuf_queue *q,
			     struct videobuf_buffer *vb,
			     struct v4l2_framebuffer *fbuf)
{
	int err, pages;
	dma_addr_t bus;
	struct videobuf_dma_sg_memory *mem = vb->priv;
	BUG_ON(!mem);

	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);

	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_USERPTR:
		if (0 == vb->baddr) {
			/* no userspace addr -- kernel bounce buffer */
			pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
			err = videobuf_dma_init_kernel(&mem->dma,
						       DMA_FROM_DEVICE,
						       pages);
			if (0 != err)
				return err;
		} else if (vb->memory == V4L2_MEMORY_USERPTR) {

int videobuf_dma_free(struct videobuf_dmabuf *dma)
{
	MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
	BUG_ON(dma->sglen);

	if (dma->pages) {
		int i;
		for (i=0; i < dma->nr_pages; i++)
			page_cache_release(dma->pages[i]);
		kfree(dma->pages);
		dma->pages = NULL;
	}

	vfree(dma->vmalloc);
	dma->vmalloc = NULL;
	dma->varea = NULL;

	if (dma->bus_addr) {
		dma->bus_addr = 0;
	}
	dma->direction = PCI_DMA_NONE;
	return 0;
}

void videobuf_vmalloc_free(struct videobuf_buffer *buf)
{
	struct videobuf_vmalloc_memory *mem = buf->priv;

	/*                                                             
                                                                   
                                                     
                                                                   
                     
  */
	if ((buf->memory != V4L2_MEMORY_USERPTR) || buf->baddr)
		return;

	if (!mem)
		return;

	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);

	vfree(mem->vaddr);
	mem->vaddr = NULL;

	return;
}

/* Locking: Caller holds q->vb_lock */
static int __videobuf_mmap_free(struct videobuf_queue *q)
{
	int i;

	if (!q)
		return 0;

	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);

	for (i = 0; i < VIDEO_MAX_FRAME; i++)
		if (q->bufs[i] && q->bufs[i]->map)
			return -EBUSY;

	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
		if (NULL == q->bufs[i])
			continue;
		q->ops->buf_release(q, q->bufs[i]);
		kfree(q->bufs[i]);
		q->bufs[i] = NULL;
	}

	return 0;
}

static void sipsess_close_handler(int err, const struct sip_msg *msg,
				  void *arg)
{
	struct call *call = arg;
	char reason[128] = "";

	MAGIC_CHECK(call);

	if (err) {
		info("%s: session closed: %m\n", call->peer_uri, err);

		if (call->not) {
			(void)call_notify_sipfrag(call, 500, "%m", err);
		}
	}
	else if (msg) {

		call->scode = msg->scode;

		(void)re_snprintf(reason, sizeof(reason), "%u %r",
				  msg->scode, &msg->reason);

		info("%s: session closed: %u %r\n",
		     call->peer_uri, msg->scode, &msg->reason);

		if (call->not) {
			(void)call_notify_sipfrag(call, msg->scode,
						  "%r", &msg->reason);
		}
	}
	else {
		info("%s: session closed\n", call->peer_uri);
	}

	call_stream_stop(call);
	call_event_handler(call, CALL_EVENT_CLOSED, reason);
}

static void
videobuf_vm_close(struct vm_area_struct *vma)
{
	struct videobuf_mapping *map = vma->vm_private_data;
	struct videobuf_queue *q = map->q;
	struct videobuf_dma_sg_memory *mem;
	int i;

	dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
		map->count,vma->vm_start,vma->vm_end);

	map->count--;
	if (0 == map->count) {
		dprintk(1,"munmap %p q=%p\n",map,q);
		mutex_lock(&q->vb_lock);
		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
			if (NULL == q->bufs[i])
				continue;
			mem=q->bufs[i]->priv;

			if (!mem)
				continue;

			MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);

			if (q->bufs[i]->map != map)
				continue;
			q->bufs[i]->map   = NULL;
			q->bufs[i]->baddr = 0;
			q->ops->buf_release(q,q->bufs[i]);
		}
		mutex_unlock(&q->vb_lock);
		kfree(map);
	}
	return;
}

EAPI Evas_GL *
evas_gl_new(Evas *e)
{
   Evas_GL *evas_gl;

   MAGIC_CHECK(e, Evas, MAGIC_EVAS);
   return NULL;
   MAGIC_CHECK_END();

   evas_gl = calloc(1, sizeof(Evas_GL));
   if (!evas_gl) return NULL;

   evas_gl->magic = MAGIC_EVAS_GL;
   evas_gl->evas = eo_data_ref(e, EVAS_CLASS);

   if (!evas_gl->evas->engine.func->gl_context_create)
     {
        ERR("Evas GL engine not available.");
        free(evas_gl);
        return NULL;
     }

   return evas_gl;
}

EAPI void
evas_gl_surface_destroy(Evas_GL *evas_gl, Evas_GL_Surface *surf)
{
   // Magic
   MAGIC_CHECK(evas_gl, Evas_GL, MAGIC_EVAS_GL);
   return;
   MAGIC_CHECK_END();

   if (!surf)
     {
        ERR("Trying to destroy a NULL surface pointer!");
        return;
     }

   // Call Engine's Surface Destroy
   evas_gl->evas->engine.func->gl_surface_destroy(evas_gl->evas->engine.data.output, surf->data);

   // Remove it from the list
   evas_gl->surfaces = eina_list_remove(evas_gl->surfaces, surf);

   // Delete the object
   free(surf);
   surf = NULL;
}

EAPI void
evas_gl_context_destroy(Evas_GL *evas_gl, Evas_GL_Context *ctx)
{

   MAGIC_CHECK(evas_gl, Evas_GL, MAGIC_EVAS_GL);
   return;
   MAGIC_CHECK_END();

   if (!ctx)
     {
        ERR("Trying to destroy a NULL context pointer!");
        return;
     }

   // Call Engine's destroy
   evas_gl->evas->engine.func->gl_context_destroy(evas_gl->evas->engine.data.output, ctx->data);

   // Remove it from the list
   evas_gl->contexts = eina_list_remove(evas_gl->contexts, ctx);

   // Delete the object
   free(ctx);
   ctx = NULL;
}

/* Locking: Only usage in bttv unsafe find way to remove */
int videobuf_queue_is_busy(struct videobuf_queue *q)
{
	int i;

	MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);

	if (q->streaming) {
		dprintk(1,"busy: streaming active\n");
		return 1;
	}
	if (q->reading) {
		dprintk(1,"busy: pending read #1\n");
		return 1;
	}
	if (q->read_buf) {
		dprintk(1,"busy: pending read #2\n");
		return 1;
	}
	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
		if (NULL == q->bufs[i])
			continue;
		if (q->bufs[i]->map) {
			dprintk(1,"busy: buffer #%d mapped\n",i);
			return 1;
		}
		if (q->bufs[i]->state == STATE_QUEUED) {
			dprintk(1,"busy: buffer #%d queued\n",i);
			return 1;
		}
		if (q->bufs[i]->state == STATE_ACTIVE) {
			dprintk(1,"busy: buffer #%d avtive\n",i);
			return 1;
		}
	}
	return 0;
}

/* Locking: Caller holds q->lock */
static int __videobuf_mmap_free(struct videobuf_queue *q)
{
	int i;
	int rc;

	if (!q)
		return 0;

	MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);

	rc  = CALL(q,mmap_free,q);
	if (rc<0)
		return rc;

	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
		if (NULL == q->bufs[i])
			continue;
		q->ops->buf_release(q,q->bufs[i]);
		kfree(q->bufs[i]);
		q->bufs[i] = NULL;
	}

	return rc;
}

static int __videobuf_iolock(struct videobuf_queue *q,
			     struct videobuf_buffer *vb,
			     struct v4l2_framebuffer *fbuf)
{
	struct videobuf_vmalloc_memory *mem = vb->priv;
	int pages;

	BUG_ON(!mem);

	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);

	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
		dprintk(1, "%s memory method MMAP\n", __func__);

		/* All handling should be done by __videobuf_mmap_mapper() */
		if (!mem->vaddr) {
			printk(KERN_ERR "memory is not alloced/mmapped.\n");
			return -EINVAL;
		}
		break;
	case V4L2_MEMORY_USERPTR:
		pages = PAGE_ALIGN(vb->size);

		dprintk(1, "%s memory method USERPTR\n", __func__);

		if (vb->baddr) {
			printk(KERN_ERR "USERPTR is currently not supported\n");
			return -EINVAL;
		}

		/* The only USERPTR currently supported is the one needed for
		 * read() method.
		 */

		mem->vaddr = vmalloc_user(pages);
		if (!mem->vaddr) {
			printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
			return -ENOMEM;
		}
		dprintk(1, "vmalloc is at addr %p (%d pages)\n",
			mem->vaddr, pages);

#if 0
		int rc;
		/* Kernel userptr is used also by read() method. In this case,
		   there's no need to remap, since data will be copied to user
		 */
		if (!vb->baddr)
			return 0;

		/* FIXME: to properly support USERPTR, remap should occur.
		   The code below won't work, since mem->vma = NULL
		 */
		/* Try to remap memory */
		rc = remap_vmalloc_range(mem->vma, (void *)vb->baddr, 0);
		if (rc < 0) {
			printk(KERN_ERR "mmap: remap failed with error %d", rc);
			return -ENOMEM;
		}
#endif

		break;
	case V4L2_MEMORY_OVERLAY:
	default:
		dprintk(1, "%s memory method OVERLAY/unknown\n", __func__);

		/* Currently, doesn't support V4L2_MEMORY_OVERLAY */
		printk(KERN_ERR "Memory method currently unsupported.\n");
		return -EINVAL;
	}

	return 0;
}

static int __videobuf_iolock(struct videobuf_queue *q,
			     struct videobuf_buffer *vb,
			     struct v4l2_framebuffer *fbuf)
{
	struct videobuf_vmalloc_memory *mem = vb->priv;
	int pages;

	BUG_ON(!mem);

	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);

	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
		dprintk(1, "%s memory method MMAP\n", __func__);

		
		if (!mem->vaddr) {
			printk(KERN_ERR "memory is not alloced/mmapped.\n");
			return -EINVAL;
		}
		break;
	case V4L2_MEMORY_USERPTR:
		pages = PAGE_ALIGN(vb->size);

		dprintk(1, "%s memory method USERPTR\n", __func__);

		if (vb->baddr) {
			printk(KERN_ERR "USERPTR is currently not supported\n");
			return -EINVAL;
		}


		mem->vaddr = vmalloc_user(pages);
		if (!mem->vaddr) {
			printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
			return -ENOMEM;
		}
		dprintk(1, "vmalloc is at addr %p (%d pages)\n",
			mem->vaddr, pages);

#if 0
		int rc;
		if (!vb->baddr)
			return 0;

		
		rc = remap_vmalloc_range(mem->vma, (void *)vb->baddr, 0);
		if (rc < 0) {
			printk(KERN_ERR "mmap: remap failed with error %d", rc);
			return -ENOMEM;
		}
#endif

		break;
	case V4L2_MEMORY_OVERLAY:
	default:
		dprintk(1, "%s memory method OVERLAY/unknown\n", __func__);

		
		printk(KERN_ERR "Memory method currently unsupported.\n");
		return -EINVAL;
	}

	return 0;
}

static void call_event_handler(struct call *call, enum call_event ev,
			       const char *str, void *arg)
{
	struct ua *ua = arg;
	const char *peeruri;
	struct call *call2 = NULL;
	int err;

	MAGIC_CHECK(ua);

	peeruri = call_peeruri(call);

	/* stop any ringtones */
	ua->play = mem_deref(ua->play);

	switch (ev) {

	case CALL_EVENT_INCOMING:

		if (contact_block_access(peeruri)) {

			info("ua: blocked access: \"%s\"\n", peeruri);

			ua_event(ua, UA_EVENT_CALL_CLOSED, call, str);
			mem_deref(call);
			break;
		}

		switch (ua->acc->answermode) {

		case ANSWERMODE_EARLY:
			(void)call_progress(call);
			break;

		case ANSWERMODE_AUTO:
			(void)call_answer(call, 200);
			break;

		case ANSWERMODE_MANUAL:
		default:
			if (list_count(&ua->calls) > 1) {
				(void)play_file(&ua->play,
						    "callwaiting.wav", 3);
			}
			else {
				/* Alert user */
				(void)play_file(&ua->play, "ring.wav", -1);
			}

			ua_event(ua, UA_EVENT_CALL_INCOMING, call, peeruri);
			break;
		}
		break;

	case CALL_EVENT_RINGING:
		(void)play_file(&ua->play, "ringback.wav", -1);

		ua_event(ua, UA_EVENT_CALL_RINGING, call, peeruri);
		break;

	case CALL_EVENT_PROGRESS:
		ua_printf(ua, "Call in-progress: %s\n", peeruri);
		ua_event(ua, UA_EVENT_CALL_PROGRESS, call, peeruri);
		break;

	case CALL_EVENT_ESTABLISHED:
		ua_printf(ua, "Call established: %s\n", peeruri);
		ua_event(ua, UA_EVENT_CALL_ESTABLISHED, call, peeruri);
		break;

	case CALL_EVENT_CLOSED:
		if (call_scode(call)) {
			const char *tone;
			tone = translate_errorcode(call_scode(call));
			if (tone)
				(void)play_file(&ua->play, tone, 1);
		}
		ua_event(ua, UA_EVENT_CALL_CLOSED, call, str);
		mem_deref(call);
		break;

	case CALL_EVENT_TRANSFER:

		/*
		 * Create a new call to transfer target.
		 *
		 * NOTE: we will automatically connect a new call to the
		 *       transfer target
		 */

		ua_printf(ua, "transferring call to %s\n", str);

		err = ua_call_alloc(&call2, ua, VIDMODE_ON, NULL, call,
				    call_localuri(call));
		if (!err) {
			struct pl pl;

			pl_set_str(&pl, str);

			err = call_connect(call2, &pl);
//.........这里部分代码省略.........