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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include "linux/init.h" | |
7 | #include "linux/ctype.h" | |
8 | #include "linux/proc_fs.h" | |
9 | #include "asm/uaccess.h" | |
10 | ||
11 | /* If read and write race, the read will still atomically read a valid | |
12 | * value. | |
13 | */ | |
14 | int uml_exitcode = 0; | |
15 | ||
16 | static int read_proc_exitcode(char *page, char **start, off_t off, | |
17 | int count, int *eof, void *data) | |
18 | { | |
19 | int len; | |
20 | ||
21 | len = sprintf(page, "%d\n", uml_exitcode); | |
22 | len -= off; | |
23 | if(len <= off+count) *eof = 1; | |
24 | *start = page + off; | |
25 | if(len > count) len = count; | |
26 | if(len < 0) len = 0; | |
27 | return(len); | |
28 | } | |
29 | ||
30 | static int write_proc_exitcode(struct file *file, const char __user *buffer, | |
31 | unsigned long count, void *data) | |
32 | { | |
33 | char *end, buf[sizeof("nnnnn\0")]; | |
34 | int tmp; | |
35 | ||
36 | if(copy_from_user(buf, buffer, count)) | |
37 | return(-EFAULT); | |
38 | tmp = simple_strtol(buf, &end, 0); | |
39 | if((*end != '\0') && !isspace(*end)) | |
40 | return(-EINVAL); | |
41 | uml_exitcode = tmp; | |
42 | return(count); | |
43 | } | |
44 | ||
45 | static int make_proc_exitcode(void) | |
46 | { | |
47 | struct proc_dir_entry *ent; | |
48 | ||
49 | ent = create_proc_entry("exitcode", 0600, &proc_root); | |
50 | if(ent == NULL){ | |
51 | printk("make_proc_exitcode : Failed to register " | |
52 | "/proc/exitcode\n"); | |
53 | return(0); | |
54 | } | |
55 | ||
56 | ent->read_proc = read_proc_exitcode; | |
57 | ent->write_proc = write_proc_exitcode; | |
58 | ||
59 | return(0); | |
60 | } | |
61 | ||
62 | __initcall(make_proc_exitcode); | |
63 | ||
64 | /* | |
65 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
66 | * Emacs will notice this stuff at the end of the file and automatically | |
67 | * adjust the settings for this buffer only. This must remain at the end | |
68 | * of the file. | |
69 | * --------------------------------------------------------------------------- | |
70 | * Local variables: | |
71 | * c-file-style: "linux" | |
72 | * End: | |
73 | */ |