Commit | Line | Data |
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e16f5350 | 1 | #include <linux/kernel.h> |
1da177e4 LT |
2 | #include <linux/init.h> |
3 | #include <linux/console.h> | |
4 | ||
5 | #include "chan_user.h" | |
6 | ||
7 | /* ----------------------------------------------------------------------------- */ | |
8 | /* trivial console driver -- simply dump everything to stderr */ | |
9 | ||
10 | /* | |
b60745b9 | 11 | * Don't register by default -- as this registers very early in the |
6edb0862 | 12 | * boot process it becomes the default console. |
730760e9 JD |
13 | * |
14 | * Initialized at init time. | |
1da177e4 LT |
15 | */ |
16 | static int use_stderr_console = 0; | |
17 | ||
18 | static void stderr_console_write(struct console *console, const char *string, | |
19 | unsigned len) | |
20 | { | |
21 | generic_write(2 /* stderr */, string, len, NULL); | |
22 | } | |
23 | ||
24 | static struct console stderr_console = { | |
da00d9a5 JD |
25 | .name = "stderr", |
26 | .write = stderr_console_write, | |
27 | .flags = CON_PRINTBUFFER, | |
1da177e4 LT |
28 | }; |
29 | ||
30 | static int __init stderr_console_init(void) | |
31 | { | |
32 | if (use_stderr_console) | |
33 | register_console(&stderr_console); | |
34 | return 0; | |
35 | } | |
36 | console_initcall(stderr_console_init); | |
37 | ||
38 | static int stderr_setup(char *str) | |
39 | { | |
40 | if (!str) | |
41 | return 0; | |
42 | use_stderr_console = simple_strtoul(str,&str,0); | |
43 | return 1; | |
44 | } | |
45 | __setup("stderr=", stderr_setup); | |
6edb0862 JD |
46 | |
47 | /* The previous behavior of not unregistering led to /dev/console being | |
48 | * impossible to open. My FC5 filesystem started having init die, and the | |
49 | * system panicing because of this. Unregistering causes the real | |
50 | * console to become the default console, and /dev/console can then be | |
51 | * opened. Making this an initcall makes this happen late enough that | |
52 | * there is no added value in dumping everything to stderr, and the | |
53 | * normal console is good enough to show you all available output. | |
54 | */ | |
55 | static int __init unregister_stderr(void) | |
56 | { | |
57 | unregister_console(&stderr_console); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | __initcall(unregister_stderr); |