xcb_intern_atom_unchecked.3 - Online Linux Manual Page

xcb_intern_atom - Online Linux Manual PageSection : 3
Updated : libxcb 1.13.1
Source : X Version 11
Note : XCB Requests

NAMExcb_intern_atom − Get atom identifier by name

SYNOPSIS#include <xcb/xproto.h>

Request functionxcb_intern_atom_cookie_t xcb_intern_atom(xcb_connection_t *conn, uint8_t only_if_exists, uint16_t name_len, const char *name);

Reply datastructuretypedef 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 functionxcb_intern_atom_reply_t *xcb_intern_atom_reply(xcb_connection_t *conn, xcb_intern_atom_cookie_t cookie, xcb_generic_error_t **e);

REQUEST ARGUMENTSconn 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 FIELDSresponse_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.

DESCRIPTIONRetrieves 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 VALUEReturns 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.

ERRORSxcb_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 %u\n", reply->atom); free(reply); } }

AUTHORGenerated from xproto.xml. Contact xcb@lists.freedesktop.org for corrections and improvements. 0

Johanes Gumabo

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