i3
shmlog.h
Go to the documentation of this file.
1/*
2 * vim:ts=4:sw=4:expandtab
3 *
4 * i3 - an improved tiling window manager
5 * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
6 *
7 * The format of the shmlog data structure which i3 development versions use by
8 * default (ringbuffer for storing the debug log).
9 *
10 */
11#pragma once
12
13#include <config.h>
14
15/* Default shmlog size if not set by user. */
16extern const int default_shmlog_size;
17
22typedef struct i3_shmlog_header {
23 /* Byte offset where the next line will be written to. */
25
26 /* Byte offset where the last wrap occurred. */
28
29 /* The size of the logfile in bytes. Since the size is limited to 25 MiB
30 * an uint32_t is sufficient. */
31 uint32_t size;
32
33 /* wrap counter. We need it to reliably signal to clients that we just
34 * wrapped (clients cannot use offset_last_wrap because that might
35 * coincidentally be exactly the same as previously). Overflows can happen
36 * and don’t matter — clients use an equality check (==). */
37 uint32_t wrap_count;
const int default_shmlog_size
Definition main.c:84
struct i3_shmlog_header i3_shmlog_header
Header of the shmlog file.
Header of the shmlog file.
Definition shmlog.h:22
uint32_t offset_last_wrap
Definition shmlog.h:27
uint32_t offset_next_write
Definition shmlog.h:24
uint32_t wrap_count
Definition shmlog.h:37
uint32_t size
Definition shmlog.h:31