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 *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 %u, reply->atom);
free(reply);
}
}