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These functions are expected to be useful only to X protocol extension implementations built on XCB. They are declared in xcbext.h.
Care is required when calling these functions, as they generally do not have the type-safety properties of the public API functions.
[[!toc levels="6"]]
## `struct xcb_extension_t`
struct xcb_extension_t {
const char *name; // the X name of this extension, stored as a null-terminated string
int global_id; // a small integer unique across all extensions in the current process
};
## `xcb_protocol_request_t`
typedef struct {
size_t count; // number of elements in the iovec array
xcb_extension_t *ext; // extension identifier, or null for the core protocol
uint8_t opcode; // major opcode of the request for the core protocol, or minor opcode for an extension
uint8_t isvoid; // zero if this request will return a reply; non-zero otherwise
} xcb_protocol_request_t;
Values for a particular request that are always constant.
## `xcb_send_request`
(`xcb_out.c`)
int
xcb_send_request (xcb_connection *c,
int flags, // a combination of the flags `XCB_REQUEST_CHECKED`, `XCB_REQUEST_RAW`, and `XCB_REQUEST_DISCARD_REPLY`
unsigned int *sequence,
struct iovec *vector,
const xcb_protocol_request_t *request );
## `xcb_wait_for_reply`
(`xcb_in.c`)
void *
xcb_wait_for_reply (xcb_connection *c,
unsigned int request,
xcb_generic_error_t **e );
## `xcb_poll_for_reply`
(`xcb_in.c`)
int
xcb_poll_for_reply (xcb_connection *c,
unsigned int request,
void **reply,
xcb_generic_error_t **e );
Returns: 1 if the reply was recieved (reply or error is filled in), 0 if the reply has not yet arrived.
## `xcb_popcount`
(`xcb_util.c`)
int
xcb_popcount (uint32_t mask);
Returns the number of bits in the binary representation of `mask` that are equal to 1. This is also called a "population count".
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