xcb_shm_create_segment_reply3
Asks the server to allocate a shared memory segment.
Part of xcb_shm_create_segment(3).
Usage
Reply datastructure
uint8_t response_type;
uint8_t nfd;
uint16_t sequence;
uint32_t length;
uint8_t pad0
[24]
;
Request arguments
- conn
-
The XCB connection to X11.
- shmseg
-
A shared memory segment ID created with xcb_generate_id().
- size
-
The size of the segment to create.
- read_only
-
True if the server should map the segment read-only; otherwise false.
Reply fields
- response_type
-
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.
- 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).
- nfd
-
The number of file descriptors sent by the server. Will always be 1.
- shm_fd
-
TODO: NOT YET DOCUMENTED.
Overview
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().
Return value
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.
Errors
This request does never generate any errors.
History
- Arch Linux 2026-11-01 to Debian 13 (Trixie): the text shown here
- Debian 12 (Bookworm)
- Debian 11 (Bullseye)
- Debian 10 (Buster)
- Debian 9 (Stretch)