537 lines
18 KiB
C
537 lines
18 KiB
C
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/*
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* Copyright (C) 2001-2006 Bart Massey, Jamey Sharp, and Josh Triplett.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the names of the authors or their
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* institutions shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization from the authors.
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*/
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#ifndef __XCB_H__
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#define __XCB_H__
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#include <sys/types.h>
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#if defined(__solaris__)
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#include <inttypes.h>
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#else
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#include <stdint.h>
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#endif
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#if defined(__minix)
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#define _MTHREADIFY_PTHREADS 1
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#include <minix/mthread.h>
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#endif /* defined(__minix) */
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#ifndef _WIN32
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#include <sys/uio.h>
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#else
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#include "xcb_windefs.h"
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#endif
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#if !defined(__minix)
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#include <pthread.h>
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#endif /* !defined(__minix) */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @file xcb.h
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*/
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/**
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* @defgroup XCB_Core_API XCB Core API
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* @brief Core API of the XCB library.
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*
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* @{
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*/
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/* Pre-defined constants */
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/** Current protocol version */
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#define X_PROTOCOL 11
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/** Current minor version */
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#define X_PROTOCOL_REVISION 0
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/** X_TCP_PORT + display number = server port for TCP transport */
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#define X_TCP_PORT 6000
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/** xcb connection errors because of socket, pipe and other stream errors. */
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#define XCB_CONN_ERROR 1
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/** xcb connection shutdown because of extension not supported */
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#define XCB_CONN_CLOSED_EXT_NOTSUPPORTED 2
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/** malloc(), calloc() and realloc() error upon failure, for eg ENOMEM */
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#define XCB_CONN_CLOSED_MEM_INSUFFICIENT 3
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/** Connection closed, exceeding request length that server accepts. */
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#define XCB_CONN_CLOSED_REQ_LEN_EXCEED 4
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/** Connection closed, error during parsing display string. */
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#define XCB_CONN_CLOSED_PARSE_ERR 5
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/** Connection closed because the server does not have a screen matching the display. */
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#define XCB_CONN_CLOSED_INVALID_SCREEN 6
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#define XCB_TYPE_PAD(T,I) (-(I) & (sizeof(T) > 4 ? 3 : sizeof(T) - 1))
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/* Opaque structures */
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/**
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* @brief XCB Connection structure.
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*
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* A structure that contain all data that XCB needs to communicate with an X server.
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*/
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typedef struct xcb_connection_t xcb_connection_t; /**< Opaque structure containing all data that XCB needs to communicate with an X server. */
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/* Other types */
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/**
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* @brief Generic iterator.
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*
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* A generic iterator structure.
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*/
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typedef struct {
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void *data; /**< Data of the current iterator */
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int rem; /**< remaining elements */
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int index; /**< index of the current iterator */
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} xcb_generic_iterator_t;
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/**
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* @brief Generic reply.
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*
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* A generic reply structure.
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*/
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typedef struct {
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uint8_t response_type; /**< Type of the response */
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uint8_t pad0; /**< Padding */
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uint16_t sequence; /**< Sequence number */
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uint32_t length; /**< Length of the response */
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} xcb_generic_reply_t;
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/**
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* @brief Generic event.
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*
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* A generic event structure.
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*/
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typedef struct {
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uint8_t response_type; /**< Type of the response */
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uint8_t pad0; /**< Padding */
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uint16_t sequence; /**< Sequence number */
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uint32_t pad[7]; /**< Padding */
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uint32_t full_sequence; /**< full sequence */
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} xcb_generic_event_t;
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/**
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* @brief GE event
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*
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* An event as sent by the XGE extension. The length field specifies the
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* number of 4-byte blocks trailing the struct.
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*/
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typedef struct {
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uint8_t response_type; /**< Type of the response */
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uint8_t pad0; /**< Padding */
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uint16_t sequence; /**< Sequence number */
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uint32_t length;
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uint16_t event_type;
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uint16_t pad1;
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uint32_t pad[5]; /**< Padding */
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uint32_t full_sequence; /**< full sequence */
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} xcb_ge_event_t;
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/**
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* @brief Generic error.
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*
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* A generic error structure.
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*/
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typedef struct {
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uint8_t response_type; /**< Type of the response */
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uint8_t error_code; /**< Error code */
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uint16_t sequence; /**< Sequence number */
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uint32_t resource_id; /** < Resource ID for requests with side effects only */
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uint16_t minor_code; /** < Minor opcode of the failed request */
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uint8_t major_code; /** < Major opcode of the failed request */
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uint8_t pad0;
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uint32_t pad[5]; /**< Padding */
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uint32_t full_sequence; /**< full sequence */
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} xcb_generic_error_t;
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/**
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* @brief Generic cookie.
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*
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* A generic cookie structure.
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*/
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typedef struct {
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unsigned int sequence; /**< Sequence number */
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} xcb_void_cookie_t;
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/* Include the generated xproto header. */
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#include "xproto.h"
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/** XCB_NONE is the universal null resource or null atom parameter value for many core X requests */
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#define XCB_NONE 0L
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/** XCB_COPY_FROM_PARENT can be used for many xcb_create_window parameters */
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#define XCB_COPY_FROM_PARENT 0L
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/** XCB_CURRENT_TIME can be used in most requests that take an xcb_timestamp_t */
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#define XCB_CURRENT_TIME 0L
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/** XCB_NO_SYMBOL fills in unused entries in xcb_keysym_t tables */
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#define XCB_NO_SYMBOL 0L
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/* xcb_auth.c */
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/**
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* @brief Container for authorization information.
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*
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* A container for authorization information to be sent to the X server.
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*/
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typedef struct xcb_auth_info_t {
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int namelen; /**< Length of the string name (as returned by strlen). */
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char *name; /**< String containing the authentication protocol name, such as "MIT-MAGIC-COOKIE-1" or "XDM-AUTHORIZATION-1". */
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int datalen; /**< Length of the data member. */
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char *data; /**< Data interpreted in a protocol-specific manner. */
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} xcb_auth_info_t;
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/* xcb_out.c */
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/**
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* @brief Forces any buffered output to be written to the server.
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* @param c: The connection to the X server.
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* @return > @c 0 on success, <= @c 0 otherwise.
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*
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* Forces any buffered output to be written to the server. Blocks
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* until the write is complete.
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*/
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int xcb_flush(xcb_connection_t *c);
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/**
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* @brief Returns the maximum request length that this server accepts.
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* @param c: The connection to the X server.
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* @return The maximum request length field.
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*
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* In the absence of the BIG-REQUESTS extension, returns the
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* maximum request length field from the connection setup data, which
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* may be as much as 65535. If the server supports BIG-REQUESTS, then
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* the maximum request length field from the reply to the
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* BigRequestsEnable request will be returned instead.
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*
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* Note that this length is measured in four-byte units, making the
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* theoretical maximum lengths roughly 256kB without BIG-REQUESTS and
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* 16GB with.
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*/
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uint32_t xcb_get_maximum_request_length(xcb_connection_t *c);
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/**
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* @brief Prefetch the maximum request length without blocking.
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* @param c: The connection to the X server.
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*
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* Without blocking, does as much work as possible toward computing
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* the maximum request length accepted by the X server.
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*
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* Invoking this function may cause a call to xcb_big_requests_enable,
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* but will not block waiting for the reply.
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* xcb_get_maximum_request_length will return the prefetched data
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* after possibly blocking while the reply is retrieved.
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*
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* Note that in order for this function to be fully non-blocking, the
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* application must previously have called
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* xcb_prefetch_extension_data(c, &xcb_big_requests_id) and the reply
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* must have already arrived.
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*/
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void xcb_prefetch_maximum_request_length(xcb_connection_t *c);
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/* xcb_in.c */
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/**
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* @brief Returns the next event or error from the server.
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* @param c: The connection to the X server.
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* @return The next event from the server.
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*
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* Returns the next event or error from the server, or returns null in
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* the event of an I/O error. Blocks until either an event or error
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* arrive, or an I/O error occurs.
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*/
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xcb_generic_event_t *xcb_wait_for_event(xcb_connection_t *c);
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/**
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* @brief Returns the next event or error from the server.
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* @param c: The connection to the X server.
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* error status of the operation.
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* @return The next event from the server.
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*
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* Returns the next event or error from the server, if one is
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* available, or returns @c NULL otherwise. If no event is available, that
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* might be because an I/O error like connection close occurred while
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* attempting to read the next event, in which case the connection is
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* shut down when this function returns.
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*/
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xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c);
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/**
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* @brief Returns the next event without reading from the connection.
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* @param c: The connection to the X server.
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* @return The next already queued event from the server.
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*
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* This is a version of xcb_poll_for_event that only examines the
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* event queue for new events. The function doesn't try to read new
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* events from the connection if no queued events are found.
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*
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* This function is useful for callers that know in advance that all
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* interesting events have already been read from the connection. For
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* example, callers might use xcb_wait_for_reply and be interested
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* only of events that preceded a specific reply.
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*/
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xcb_generic_event_t *xcb_poll_for_queued_event(xcb_connection_t *c);
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/**
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* @brief Return the error for a request, or NULL if none can ever arrive.
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* @param c: The connection to the X server.
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* @param cookie: The request cookie.
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* @return The error for the request, or NULL if none can ever arrive.
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*
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* The xcb_void_cookie_t cookie supplied to this function must have resulted
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* from a call to xcb_[request_name]_checked(). This function will block
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* until one of two conditions happens. If an error is received, it will be
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* returned. If a reply to a subsequent request has already arrived, no error
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* can arrive for this request, so this function will return NULL.
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*
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* Note that this function will perform a sync if needed to ensure that the
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* sequence number will advance beyond that provided in cookie; this is a
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* convenience to avoid races in determining whether the sync is needed.
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*/
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xcb_generic_error_t *xcb_request_check(xcb_connection_t *c, xcb_void_cookie_t cookie);
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/**
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* @brief Discards the reply for a request.
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* @param c: The connection to the X server.
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* @param sequence: The request sequence number from a cookie.
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*
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* Discards the reply for a request. Additionally, any error generated
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* by the request is also discarded (unless it was an _unchecked request
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* and the error has already arrived).
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*
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* This function will not block even if the reply is not yet available.
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*
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* Note that the sequence really does have to come from an xcb cookie;
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* this function is not designed to operate on socket-handoff replies.
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*/
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void xcb_discard_reply(xcb_connection_t *c, unsigned int sequence);
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/* xcb_ext.c */
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/**
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* @typedef typedef struct xcb_extension_t xcb_extension_t
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*/
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typedef struct xcb_extension_t xcb_extension_t; /**< Opaque structure used as key for xcb_get_extension_data_t. */
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/**
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* @brief Caches reply information from QueryExtension requests.
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* @param c: The connection.
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* @param ext: The extension data.
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* @return A pointer to the xcb_query_extension_reply_t for the extension.
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*
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* This function is the primary interface to the "extension cache",
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* which caches reply information from QueryExtension
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* requests. Invoking this function may cause a call to
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* xcb_query_extension to retrieve extension information from the
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* server, and may block until extension data is received from the
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* server.
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*
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* The result must not be freed. This storage is managed by the cache
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* itself.
|
||
|
|
*/
|
||
|
|
const xcb_query_extension_reply_t *xcb_get_extension_data(xcb_connection_t *c, xcb_extension_t *ext);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Prefetch of extension data into the extension cache
|
||
|
|
* @param c: The connection.
|
||
|
|
* @param ext: The extension data.
|
||
|
|
*
|
||
|
|
* This function allows a "prefetch" of extension data into the
|
||
|
|
* extension cache. Invoking the function may cause a call to
|
||
|
|
* xcb_query_extension, but will not block waiting for the
|
||
|
|
* reply. xcb_get_extension_data will return the prefetched data after
|
||
|
|
* possibly blocking while it is retrieved.
|
||
|
|
*/
|
||
|
|
void xcb_prefetch_extension_data(xcb_connection_t *c, xcb_extension_t *ext);
|
||
|
|
|
||
|
|
|
||
|
|
/* xcb_conn.c */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Access the data returned by the server.
|
||
|
|
* @param c: The connection.
|
||
|
|
* @return A pointer to an xcb_setup_t structure.
|
||
|
|
*
|
||
|
|
* Accessor for the data returned by the server when the xcb_connection_t
|
||
|
|
* was initialized. This data includes
|
||
|
|
* - the server's required format for images,
|
||
|
|
* - a list of available visuals,
|
||
|
|
* - a list of available screens,
|
||
|
|
* - the server's maximum request length (in the absence of the
|
||
|
|
* BIG-REQUESTS extension),
|
||
|
|
* - and other assorted information.
|
||
|
|
*
|
||
|
|
* See the X protocol specification for more details.
|
||
|
|
*
|
||
|
|
* The result must not be freed.
|
||
|
|
*/
|
||
|
|
const xcb_setup_t *xcb_get_setup(xcb_connection_t *c);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Access the file descriptor of the connection.
|
||
|
|
* @param c: The connection.
|
||
|
|
* @return The file descriptor.
|
||
|
|
*
|
||
|
|
* Accessor for the file descriptor that was passed to the
|
||
|
|
* xcb_connect_to_fd call that returned @p c.
|
||
|
|
*/
|
||
|
|
int xcb_get_file_descriptor(xcb_connection_t *c);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Test whether the connection has shut down due to a fatal error.
|
||
|
|
* @param c: The connection.
|
||
|
|
* @return > 0 if the connection is in an error state; 0 otherwise.
|
||
|
|
*
|
||
|
|
* Some errors that occur in the context of an xcb_connection_t
|
||
|
|
* are unrecoverable. When such an error occurs, the
|
||
|
|
* connection is shut down and further operations on the
|
||
|
|
* xcb_connection_t have no effect.
|
||
|
|
*
|
||
|
|
* @return XCB_CONN_ERROR, because of socket errors, pipe errors or other stream errors.
|
||
|
|
* @return XCB_CONN_CLOSED_EXT_NOTSUPPORTED, when extension not supported.
|
||
|
|
* @return XCB_CONN_CLOSED_MEM_INSUFFICIENT, when memory not available.
|
||
|
|
* @return XCB_CONN_CLOSED_REQ_LEN_EXCEED, exceeding request length that server accepts.
|
||
|
|
* @return XCB_CONN_CLOSED_PARSE_ERR, error during parsing display string.
|
||
|
|
* @return XCB_CONN_CLOSED_INVALID_SCREEN, because the server does not have a screen matching the display.
|
||
|
|
*/
|
||
|
|
int xcb_connection_has_error(xcb_connection_t *c);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Connects to the X server.
|
||
|
|
* @param fd: The file descriptor.
|
||
|
|
* @param auth_info: Authentication data.
|
||
|
|
* @return A newly allocated xcb_connection_t structure.
|
||
|
|
*
|
||
|
|
* Connects to an X server, given the open socket @p fd and the
|
||
|
|
* xcb_auth_info_t @p auth_info. The file descriptor @p fd is
|
||
|
|
* bidirectionally connected to an X server. If the connection
|
||
|
|
* should be unauthenticated, @p auth_info must be @c
|
||
|
|
* NULL.
|
||
|
|
*/
|
||
|
|
xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Closes the connection.
|
||
|
|
* @param c: The connection.
|
||
|
|
*
|
||
|
|
* Closes the file descriptor and frees all memory associated with the
|
||
|
|
* connection @c c.
|
||
|
|
*/
|
||
|
|
void xcb_disconnect(xcb_connection_t *c);
|
||
|
|
|
||
|
|
|
||
|
|
/* xcb_util.c */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Parses a display string name in the form documented by X(7x).
|
||
|
|
* @param name: The name of the display.
|
||
|
|
* @param host: A pointer to a malloc'd copy of the hostname.
|
||
|
|
* @param display: A pointer to the display number.
|
||
|
|
* @param screen: A pointer to the screen number.
|
||
|
|
* @return 0 on failure, non 0 otherwise.
|
||
|
|
*
|
||
|
|
* Parses the display string name @p display_name in the form
|
||
|
|
* documented by X(7x). Has no side effects on failure. If
|
||
|
|
* @p displayname is @c NULL or empty, it uses the environment
|
||
|
|
* variable DISPLAY. @p hostp is a pointer to a newly allocated string
|
||
|
|
* that contain the host name. @p displayp is set to the display
|
||
|
|
* number and @p screenp to the preferred screen number. @p screenp
|
||
|
|
* can be @c NULL. If @p displayname does not contain a screen number,
|
||
|
|
* it is set to @c 0.
|
||
|
|
*/
|
||
|
|
int xcb_parse_display(const char *name, char **host, int *display, int *screen);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Connects to the X server.
|
||
|
|
* @param displayname: The name of the display.
|
||
|
|
* @param screenp: A pointer to a preferred screen number.
|
||
|
|
* @return A newly allocated xcb_connection_t structure.
|
||
|
|
*
|
||
|
|
* Connects to the X server specified by @p displayname. If @p
|
||
|
|
* displayname is @c NULL, uses the value of the DISPLAY environment
|
||
|
|
* variable. If a particular screen on that server is preferred, the
|
||
|
|
* int pointed to by @p screenp (if not @c NULL) will be set to that
|
||
|
|
* screen; otherwise the screen will be set to 0.
|
||
|
|
*/
|
||
|
|
xcb_connection_t *xcb_connect(const char *displayname, int *screenp);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Connects to the X server, using an authorization information.
|
||
|
|
* @param display: The name of the display.
|
||
|
|
* @param auth: The authorization information.
|
||
|
|
* @param screen: A pointer to a preferred screen number.
|
||
|
|
* @return A newly allocated xcb_connection_t structure.
|
||
|
|
*
|
||
|
|
* Connects to the X server specified by @p displayname, using the
|
||
|
|
* authorization @p auth. If a particular screen on that server is
|
||
|
|
* preferred, the int pointed to by @p screenp (if not @c NULL) will
|
||
|
|
* be set to that screen; otherwise @p screenp will be set to 0.
|
||
|
|
*/
|
||
|
|
xcb_connection_t *xcb_connect_to_display_with_auth_info(const char *display, xcb_auth_info_t *auth, int *screen);
|
||
|
|
|
||
|
|
|
||
|
|
/* xcb_xid.c */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Allocates an XID for a new object.
|
||
|
|
* @param c: The connection.
|
||
|
|
* @return A newly allocated XID.
|
||
|
|
*
|
||
|
|
* Allocates an XID for a new object. Typically used just prior to
|
||
|
|
* various object creation functions, such as xcb_create_window.
|
||
|
|
*/
|
||
|
|
uint32_t xcb_generate_id(xcb_connection_t *c);
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @}
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* __XCB_H__ */
|