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96177602 AD |
1 | #include <linux/init.h> |
2 | #include <linux/proc_fs.h> | |
3 | #include <linux/sched.h> | |
96177602 AD |
4 | #include <linux/time.h> |
5 | #include <asm/cputime.h> | |
6 | ||
6c87df37 AD |
7 | static int proc_calc_metrics(char *page, char **start, off_t off, |
8 | int count, int *eof, int len) | |
9 | { | |
10 | if (len <= off + count) | |
11 | *eof = 1; | |
12 | *start = page + off; | |
13 | len -= off; | |
14 | if (len > count) | |
15 | len = count; | |
16 | if (len < 0) | |
17 | len = 0; | |
18 | return len; | |
19 | } | |
20 | ||
21 | static int uptime_read_proc(char *page, char **start, off_t off, int count, | |
22 | int *eof, void *data) | |
96177602 AD |
23 | { |
24 | struct timespec uptime; | |
25 | struct timespec idle; | |
6c87df37 | 26 | int len; |
96177602 AD |
27 | cputime_t idletime = cputime_add(init_task.utime, init_task.stime); |
28 | ||
29 | do_posix_clock_monotonic_gettime(&uptime); | |
30 | monotonic_to_bootbased(&uptime); | |
31 | cputime_to_timespec(idletime, &idle); | |
6c87df37 | 32 | len = sprintf(page, "%lu.%02lu %lu.%02lu\n", |
96177602 AD |
33 | (unsigned long) uptime.tv_sec, |
34 | (uptime.tv_nsec / (NSEC_PER_SEC / 100)), | |
35 | (unsigned long) idle.tv_sec, | |
36 | (idle.tv_nsec / (NSEC_PER_SEC / 100))); | |
6c87df37 | 37 | return proc_calc_metrics(page, start, off, count, eof, len); |
96177602 AD |
38 | } |
39 | ||
96177602 AD |
40 | static int __init proc_uptime_init(void) |
41 | { | |
6c87df37 | 42 | create_proc_read_entry("uptime", 0, NULL, uptime_read_proc, NULL); |
96177602 AD |
43 | return 0; |
44 | } | |
45 | module_init(proc_uptime_init); |