xcb_shm_create_segment(3) XCB Requests xcb_shm_create_segment(3)

xcb_shm_create_segment - Asks the server to allocate a shared memory segment.

#include <xcb/shm.h>

xcb_shm_create_segment_cookie_t xcb_shm_create_segment(xcb_connection_t *conn, xcb_shm_seg_t shmseg, uint32_t size, uint8_t read_only);

typedef struct xcb_shm_create_segment_reply_t {
    uint8_t  response_type;
    uint8_t  nfd;
    uint16_t sequence;
    uint32_t length;
    uint8_t  pad0[24];
} xcb_shm_create_segment_reply_t;

xcb_shm_create_segment_reply_t *xcb_shm_create_segment_reply(xcb_connection_t *conn, xcb_shm_create_segment_cookie_t cookie, xcb_generic_error_t **e);

The XCB connection to X11.
A shared memory segment ID created with xcb_generate_id().
The size of the segment to create.
True if the server should map the segment read-only; otherwise false.

The type of this reply, in this case XCB_SHM_CREATE_SEGMENT. This field is also present in the xcb_generic_reply_t and can be used to tell replies apart from each other.
The sequence number of the last request processed by the X11 server.
The length of the reply, in words (a word is 4 bytes).
The number of file descriptors sent by the server. Will always be 1.
TODO: NOT YET DOCUMENTED.

Asks the server to allocate a shared memory segment. The server’s reply will include a file descriptor for the client to pass to mmap().

Returns an xcb_shm_create_segment_cookie_t. Errors have to be handled when calling the reply function xcb_shm_create_segment_reply.

If you want to handle errors in the event loop instead, use xcb_shm_create_segment_unchecked. See xcb-requests(3) for details.

This request does never generate any errors.

xcb-requests(3)

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

libxcb 1.17.0 X Version 11