xcb_intern_atom(3)

1xcb_intern_atom(3)               XCB Requests               xcb_intern_atom(3)
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NAME

6       xcb_intern_atom - Get atom identifier by name
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SYNOPSIS

9       #include <xcb/xproto.h>
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11   Request function
12       xcb_intern_atom_cookie_t xcb_intern_atom(xcb_connection_t *conn,
13              uint8_t only_if_exists, uint16_t name_len, const char *name);
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15   Reply datastructure
16       typedef struct xcb_intern_atom_reply_t {
17           uint8_t    response_type;
18           uint8_t    pad0;
19           uint16_t   sequence;
20           uint32_t   length;
21           xcb_atom_t atom;
22       } xcb_intern_atom_reply_t;
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24   Reply function
25       xcb_intern_atom_reply_t *xcb_intern_atom_reply(xcb_connection_t *conn,
26              xcb_intern_atom_cookie_t cookie, xcb_generic_error_t **e);
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REQUEST ARGUMENTS

29       conn      The XCB connection to X11.
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31       only_if_exists
32                 Return a valid atom id only if the atom already exists.
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34       name_len  The length of the following name.
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36       name      The name of the atom.
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REPLY FIELDS

39       response_type
40                 The type of this reply, in this case XCB_INTERN_ATOM. This
41                 field is also present in the xcb_generic_reply_t and can be
42                 used to tell replies apart from each other.
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44       sequence  The sequence number of the last request processed by the X11
45                 server.
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47       length    The length of the reply, in words (a word is 4 bytes).
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49       atom      TODO: NOT YET DOCUMENTED.
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DESCRIPTION

52       Retrieves the identifier (xcb_atom_t TODO) for the atom with the speci‐
53       fied name. Atoms are used in protocols like EWMH, for example to store
54       window titles (_NET_WM_NAME atom) as property of a window.
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56       If only_if_exists is 0, the atom will be created if it does not already
57       exist.  If only_if_exists is 1, XCB_ATOM_NONE will be returned if the
58       atom does not yet exist.
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RETURN VALUE

61       Returns an xcb_intern_atom_cookie_t. Errors have to be handled when
62       calling the reply function xcb_intern_atom_reply.
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64       If you want to handle errors in the event loop instead, use xcb_in‐
65       tern_atom_unchecked. See xcb-requests(3) for details.
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ERRORS

68       xcb_alloc_error_t
69                 TODO: reasons?
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71       xcb_value_error_t
72                 A value other than 0 or 1 was specified for only_if_exists.
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EXAMPLE

75       /*
76        * Resolves the _NET_WM_NAME atom.
77        *
78        */
79       void my_example(xcb_connection_t *c) {
80           xcb_intern_atom_cookie_t cookie;
81           xcb_intern_atom_reply_t *reply;
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83           cookie = xcb_intern_atom(c, 0, strlen("_NET_WM_NAME"), "_NET_WM_NAME");
84           /* ... do other work here if possible ... */
85           if ((reply = xcb_intern_atom_reply(c, cookie, NULL))) {
86               printf("The _NET_WM_NAME atom has ID %u0, reply->atom);
87               free(reply);
88           }
89       }
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AUTHOR

95       Generated from xproto.xml. Contact xcb@lists.freedesktop.org for cor‐
96       rections and improvements.
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100X Version 11                      libxcb 1.13               xcb_intern_atom(3)