Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/init.h> |
2 | #include <linux/console.h> | |
3 | ||
4 | #include "chan_user.h" | |
5 | ||
6 | /* ----------------------------------------------------------------------------- */ | |
7 | /* trivial console driver -- simply dump everything to stderr */ | |
8 | ||
9 | /* | |
10 | * Don't register by default -- as this registeres very early in the | |
6edb0862 | 11 | * boot process it becomes the default console. |
730760e9 JD |
12 | * |
13 | * Initialized at init time. | |
1da177e4 LT |
14 | */ |
15 | static int use_stderr_console = 0; | |
16 | ||
17 | static void stderr_console_write(struct console *console, const char *string, | |
18 | unsigned len) | |
19 | { | |
20 | generic_write(2 /* stderr */, string, len, NULL); | |
21 | } | |
22 | ||
23 | static struct console stderr_console = { | |
da00d9a5 JD |
24 | .name = "stderr", |
25 | .write = stderr_console_write, | |
26 | .flags = CON_PRINTBUFFER, | |
1da177e4 LT |
27 | }; |
28 | ||
29 | static int __init stderr_console_init(void) | |
30 | { | |
31 | if (use_stderr_console) | |
32 | register_console(&stderr_console); | |
33 | return 0; | |
34 | } | |
35 | console_initcall(stderr_console_init); | |
36 | ||
37 | static int stderr_setup(char *str) | |
38 | { | |
39 | if (!str) | |
40 | return 0; | |
41 | use_stderr_console = simple_strtoul(str,&str,0); | |
42 | return 1; | |
43 | } | |
44 | __setup("stderr=", stderr_setup); | |
6edb0862 JD |
45 | |
46 | /* The previous behavior of not unregistering led to /dev/console being | |
47 | * impossible to open. My FC5 filesystem started having init die, and the | |
48 | * system panicing because of this. Unregistering causes the real | |
49 | * console to become the default console, and /dev/console can then be | |
50 | * opened. Making this an initcall makes this happen late enough that | |
51 | * there is no added value in dumping everything to stderr, and the | |
52 | * normal console is good enough to show you all available output. | |
53 | */ | |
54 | static int __init unregister_stderr(void) | |
55 | { | |
56 | unregister_console(&stderr_console); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | __initcall(unregister_stderr); |