Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e16f5350 | 2 | #include <linux/kernel.h> |
1da177e4 LT |
3 | #include <linux/init.h> |
4 | #include <linux/console.h> | |
5 | ||
6 | #include "chan_user.h" | |
7 | ||
8 | /* ----------------------------------------------------------------------------- */ | |
9 | /* trivial console driver -- simply dump everything to stderr */ | |
10 | ||
11 | /* | |
b60745b9 | 12 | * Don't register by default -- as this registers very early in the |
6edb0862 | 13 | * boot process it becomes the default console. |
730760e9 JD |
14 | * |
15 | * Initialized at init time. | |
1da177e4 LT |
16 | */ |
17 | static int use_stderr_console = 0; | |
18 | ||
19 | static void stderr_console_write(struct console *console, const char *string, | |
20 | unsigned len) | |
21 | { | |
22 | generic_write(2 /* stderr */, string, len, NULL); | |
23 | } | |
24 | ||
25 | static struct console stderr_console = { | |
da00d9a5 JD |
26 | .name = "stderr", |
27 | .write = stderr_console_write, | |
28 | .flags = CON_PRINTBUFFER, | |
1da177e4 LT |
29 | }; |
30 | ||
31 | static int __init stderr_console_init(void) | |
32 | { | |
33 | if (use_stderr_console) | |
34 | register_console(&stderr_console); | |
35 | return 0; | |
36 | } | |
37 | console_initcall(stderr_console_init); | |
38 | ||
39 | static int stderr_setup(char *str) | |
40 | { | |
41 | if (!str) | |
42 | return 0; | |
43 | use_stderr_console = simple_strtoul(str,&str,0); | |
44 | return 1; | |
45 | } | |
46 | __setup("stderr=", stderr_setup); | |
6edb0862 JD |
47 | |
48 | /* The previous behavior of not unregistering led to /dev/console being | |
49 | * impossible to open. My FC5 filesystem started having init die, and the | |
50 | * system panicing because of this. Unregistering causes the real | |
51 | * console to become the default console, and /dev/console can then be | |
52 | * opened. Making this an initcall makes this happen late enough that | |
53 | * there is no added value in dumping everything to stderr, and the | |
54 | * normal console is good enough to show you all available output. | |
55 | */ | |
56 | static int __init unregister_stderr(void) | |
57 | { | |
58 | unregister_console(&stderr_console); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | __initcall(unregister_stderr); |