---
name: "xcb_xv_query_port_attributes"
section: "3"
platform: "linux"
package: "libxcb"
version: "1.17.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/xcb_xv_query_port_attributes"
---

# xcb\_xv\_query\_port\_attributes(3)

## NAME

xcb\_xv\_query\_port\_attributes -

## SYNOPSIS

**#include \<xcb/xv.h\>**

### Request function

xcb\_xv\_query\_port\_attributes\_cookie\_t **xcb\_xv\_query\_port\_attributes**(xcb\_connection\_t \**conn*, xcb\_xv\_port\_t *port*);

### Reply datastructure

```

typedef struct xcb_xv_query_port_attributes_reply_t {
    uint8_t  response_type;
    uint8_t  pad0;
    uint16_t sequence;
    uint32_t length;
    uint32_t num_attributes;
    uint32_t text_size;
    uint8_t  pad1[16];
} xcb_xv_query_port_attributes_reply_t;
```

### Reply function

xcb\_xv\_query\_port\_attributes\_reply\_t \***xcb\_xv\_query\_port\_attributes\_reply**(xcb\_connection\_t \**conn*, xcb\_xv\_query\_port\_attributes\_cookie\_t *cookie*, xcb\_generic\_error\_t \*\**e*);

### Reply accessors

int **xcb\_xv\_query\_port\_attributes\_attributes\_length**(const xcb\_xv\_query\_port\_attributes\_reply\_t \**reply*);

xcb\_xv\_attribute\_info\_iterator\_t **xcb\_xv\_query\_port\_attributes\_attributes\_iterator**(const xcb\_xv\_query\_port\_attributes\_reply\_t \**reply*);\

## REQUEST ARGUMENTS

- *conn*

  The XCB connection to X11.

- *port*

  TODO: NOT YET DOCUMENTED.

## REPLY FIELDS

- *response\_type*

  The type of this reply, in this case *XCB\_XV\_QUERY\_PORT\_ATTRIBUTES*. This field is also present in the *xcb\_generic\_reply\_t* and can be used to tell replies apart from each other.

- *sequence*

  The sequence number of the last request processed by the X11 server.

- *length*

  The length of the reply, in words (a word is 4 bytes).

- *num\_attributes*

  TODO: NOT YET DOCUMENTED.

- *text\_size*

  TODO: NOT YET DOCUMENTED.

## DESCRIPTION

## RETURN VALUE

Returns an *xcb\_xv\_query\_port\_attributes\_cookie\_t*. Errors have to be handled when calling the reply function *xcb\_xv\_query\_port\_attributes\_reply*.

If you want to handle errors in the event loop instead, use *xcb\_xv\_query\_port\_attributes\_unchecked*. See **[xcb-requests(3)](/xcb-requests/3.md)** for details.

## ERRORS

This request does never generate any errors.

## SEE ALSO

## AUTHOR

Generated from xv.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.