xcb_intern_atom - Man Page
Get atom identifier by name
Synopsis
#include <xcb/xproto.h>
Request function
xcb_intern_atom_cookie_t xcb_intern_atom(xcb_connection_t *conn, uint8_t only_if_exists, uint16_t name_len, const char *name);
Reply datastructure
typedef struct xcb_intern_atom_reply_t {
uint8_t response_type;
uint8_t pad0;
uint16_t sequence;
uint32_t length;
xcb_atom_t atom;
} xcb_intern_atom_reply_t;Reply function
xcb_intern_atom_reply_t *xcb_intern_atom_reply(xcb_connection_t *conn, xcb_intern_atom_cookie_t cookie, xcb_generic_error_t **e);
Request Arguments
- conn
The XCB connection to X11.
- only_if_exists
Return a valid atom id only if the atom already exists.
- name_len
The length of the following name.
- name
The name of the atom.
Reply Fields
- response_type
The type of this reply, in this case XCB_INTERN_ATOM. 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).
- atom
TODO: NOT YET DOCUMENTED.
Description
Retrieves the identifier (xcb_atom_t TODO) for the atom with the specified name. Atoms are used in protocols like EWMH, for example to store window titles (_NET_WM_NAME atom) as property of a window.
If only_if_exists is 0, the atom will be created if it does not already exist. If only_if_exists is 1, XCB_ATOM_NONE will be returned if the atom does not yet exist.
Return Value
Returns an xcb_intern_atom_cookie_t. Errors have to be handled when calling the reply function xcb_intern_atom_reply.
If you want to handle errors in the event loop instead, use xcb_intern_atom_unchecked. See xcb-requests(3) for details.
Errors
- xcb_alloc_error_t
TODO: reasons?
- xcb_value_error_t
A value other than 0 or 1 was specified for only_if_exists.
Example
/*
* Resolves the _NET_WM_NAME atom.
*
*/
void my_example(xcb_connection_t *c) {
xcb_intern_atom_cookie_t cookie;
xcb_intern_atom_reply_t *reply;
cookie = xcb_intern_atom(c, 0, strlen("_NET_WM_NAME"), "_NET_WM_NAME");
/* ... do other work here if possible ... */
if ((reply = xcb_intern_atom_reply(c, cookie, NULL))) {
printf("The _NET_WM_NAME atom has ID %u0, reply->atom);
free(reply);
}
}See Also
xcb-requests(3), xcb-examples(3), xcb_get_atom_name(3), xlsatoms(1)
Author
Generated from xproto.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.
Referenced By
xcb_change_property(3), xcb_get_property(3), xcb-requests(3).
The man pages xcb_intern_atom_reply(3) and xcb_intern_atom_unchecked(3) are aliases of xcb_intern_atom(3).