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Diffstat (limited to 'libxcb/src/xcb.h')
| -rw-r--r-- | libxcb/src/xcb.h | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/libxcb/src/xcb.h b/libxcb/src/xcb.h new file mode 100644 index 000000000..5a1c01ab1 --- /dev/null +++ b/libxcb/src/xcb.h @@ -0,0 +1,450 @@ +/* + * Copyright (C) 2001-2006 Bart Massey, Jamey Sharp, and Josh Triplett. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the names of the authors or their + * institutions shall not be used in advertising or otherwise to promote the + * sale, use or other dealings in this Software without prior written + * authorization from the authors. + */ + +#ifndef __XCB_H__ +#define __XCB_H__ +#include <sys/types.h> + +#if defined(__solaris__) +#include <inttypes.h> +#else +#include <stdint.h> +#endif + +#include <sys/uio.h> +#include <pthread.h> + + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @file xcb.h + */ + +/** + * @defgroup XCB_Core_API XCB Core API + * @brief Core API of the XCB library. + * + * @{ + */ + +/* Pre-defined constants */ + +/** Current protocol version */ +#define X_PROTOCOL 11 + +/** Current minor version */ +#define X_PROTOCOL_REVISION 0 + +/** X_TCP_PORT + display number = server port for TCP transport */ +#define X_TCP_PORT 6000 + +#define XCB_TYPE_PAD(T,I) (-(I) & (sizeof(T) > 4 ? 3 : sizeof(T) - 1)) + +/* Opaque structures */ + +/** + * @brief XCB Connection structure. + * + * A structure that contain all data that XCB needs to communicate with an X server. + */ +typedef struct xcb_connection_t xcb_connection_t; /**< Opaque structure containing all data that XCB needs to communicate with an X server. */ + + +/* Other types */ + +/** + * @brief Generic iterator. + * + * A generic iterator structure. + */ +typedef struct { + void *data; /**< Data of the current iterator */ + int rem; /**< remaining elements */ + int index; /**< index of the current iterator */ +} xcb_generic_iterator_t; + +/** + * @brief Generic reply. + * + * A generic reply structure. + */ +typedef struct { + uint8_t response_type; /**< Type of the response */ + uint8_t pad0; /**< Padding */ + uint16_t sequence; /**< Sequence number */ + uint32_t length; /**< Length of the response */ +} xcb_generic_reply_t; + +/** + * @brief Generic event. + * + * A generic event structure. + */ +typedef struct { + uint8_t response_type; /**< Type of the response */ + uint8_t pad0; /**< Padding */ + uint16_t sequence; /**< Sequence number */ + uint32_t pad[7]; /**< Padding */ + uint32_t full_sequence; /**< full sequence */ +} xcb_generic_event_t; + +/** + * @brief Generic error. + * + * A generic error structure. + */ +typedef struct { + uint8_t response_type; /**< Type of the response */ + uint8_t error_code; /**< Error code */ + uint16_t sequence; /**< Sequence number */ + uint32_t pad[7]; /**< Padding */ + uint32_t full_sequence; /**< full sequence */ +} xcb_generic_error_t; + +/** + * @brief Generic cookie. + * + * A generic cookie structure. + */ +typedef struct { + unsigned int sequence; /**< Sequence number */ +} xcb_void_cookie_t; + + +/* Include the generated xproto header. */ +#include "xproto.h" + + +/** XCB_NONE is the universal null resource or null atom parameter value for many core X requests */ +#define XCB_NONE 0L + +/** XCB_COPY_FROM_PARENT can be used for many xcb_create_window parameters */ +#define XCB_COPY_FROM_PARENT 0L + +/** XCB_CURRENT_TIME can be used in most requests that take an xcb_timestamp_t */ +#define XCB_CURRENT_TIME 0L + +/** XCB_NO_SYMBOL fills in unused entries in xcb_keysym_t tables */ +#define XCB_NO_SYMBOL 0L + + +/* xcb_auth.c */ + +/** + * @brief Container for authorization information. + * + * A container for authorization information to be sent to the X server. + */ +typedef struct xcb_auth_info_t { + int namelen; /**< Length of the string name (as returned by strlen). */ + char *name; /**< String containing the authentication protocol name, such as "MIT-MAGIC-COOKIE-1" or "XDM-AUTHORIZATION-1". */ + int datalen; /**< Length of the data member. */ + char *data; /**< Data interpreted in a protocol-specific manner. */ +} xcb_auth_info_t; + + +/* xcb_out.c */ + +/** + * @brief Forces any buffered output to be written to the server. + * @param c: The connection to the X server. + * @return > @c 0 on success, <= @c 0 otherwise. + * + * Forces any buffered output to be written to the server. Blocks + * until the write is complete. + */ +int xcb_flush(xcb_connection_t *c); + +/** + * @brief Returns the maximum request length that this server accepts. + * @param c: The connection to the X server. + * @return The maximum request length field. + * + * In the absence of the BIG-REQUESTS extension, returns the + * maximum request length field from the connection setup data, which + * may be as much as 65535. If the server supports BIG-REQUESTS, then + * the maximum request length field from the reply to the + * BigRequestsEnable request will be returned instead. + * + * Note that this length is measured in four-byte units, making the + * theoretical maximum lengths roughly 256kB without BIG-REQUESTS and + * 16GB with. + */ +uint32_t xcb_get_maximum_request_length(xcb_connection_t *c); + +/** + * @brief Prefetch the maximum request length without blocking. + * @param c: The connection to the X server. + * + * Without blocking, does as much work as possible toward computing + * the maximum request length accepted by the X server. + * + * Invoking this function may cause a call to xcb_big_requests_enable, + * but will not block waiting for the reply. + * xcb_get_maximum_request_length will return the prefetched data + * after possibly blocking while the reply is retrieved. + * + * Note that in order for this function to be fully non-blocking, the + * application must previously have called + * xcb_prefetch_extension_data(c, &xcb_big_requests_id) and the reply + * must have already arrived. + */ +void xcb_prefetch_maximum_request_length(xcb_connection_t *c); + + +/* xcb_in.c */ + +/** + * @brief Returns the next event or error from the server. + * @param c: The connection to the X server. + * @return The next event from the server. + * + * Returns the next event or error from the server, or returns null in + * the event of an I/O error. Blocks until either an event or error + * arrive, or an I/O error occurs. + */ +xcb_generic_event_t *xcb_wait_for_event(xcb_connection_t *c); + +/** + * @brief Returns the next event or error from the server. + * @param c: The connection to the X server. + * error status of the operation. + * @return The next event from the server. + * + * Returns the next event or error from the server, if one is + * available, or returns @c NULL otherwise. If no event is available, that + * might be because an I/O error like connection close occurred while + * attempting to read the next event, in which case the connection is + * shut down when this function returns. + */ +xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c); + +/** + * @brief Return the error for a request, or NULL if none can ever arrive. + * @param c: The connection to the X server. + * @param cookie: The request cookie. + * @return The error for the request, or NULL if none can ever arrive. + * + * The xcb_void_cookie_t cookie supplied to this function must have resulted + * from a call to xcb_[request_name]_checked(). This function will block + * until one of two conditions happens. If an error is received, it will be + * returned. If a reply to a subsequent request has already arrived, no error + * can arrive for this request, so this function will return NULL. + * + * Note that this function will perform a sync if needed to ensure that the + * sequence number will advance beyond that provided in cookie; this is a + * convenience to avoid races in determining whether the sync is needed. + */ +xcb_generic_error_t *xcb_request_check(xcb_connection_t *c, xcb_void_cookie_t cookie); + + +/* xcb_ext.c */ + +/** + * @typedef typedef struct xcb_extension_t xcb_extension_t + */ +typedef struct xcb_extension_t xcb_extension_t; /**< Opaque structure used as key for xcb_get_extension_data_t. */ + +/** + * @brief Caches reply information from QueryExtension requests. + * @param c: The connection. + * @param ext: The extension data. + * @return A pointer to the xcb_query_extension_reply_t for the extension. + * + * This function is the primary interface to the "extension cache", + * which caches reply information from QueryExtension + * requests. Invoking this function may cause a call to + * xcb_query_extension to retrieve extension information from the + * server, and may block until extension data is received from the + * server. + * + * The result must not be freed. This storage is managed by the cache + * 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 1 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. + * + * @todo Other functions should document the conditions in + * which they shut down the connection. + */ +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__ */ |