fs: change return values from -EACCES to -EPERM
[linux-3.10.git] / fs / proc / uptime.c
1 #include <linux/fs.h>
2 #include <linux/init.h>
3 #include <linux/proc_fs.h>
4 #include <linux/sched.h>
5 #include <linux/seq_file.h>
6 #include <linux/time.h>
7 #include <linux/kernel_stat.h>
8 #include <asm/cputime.h>
9
10 static int uptime_proc_show(struct seq_file *m, void *v)
11 {
12         struct timespec uptime;
13         struct timespec idle;
14         u64 idletime;
15         u64 nsec;
16         u32 rem;
17         int i;
18
19         idletime = 0;
20         for_each_possible_cpu(i)
21                 idletime += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
22
23         do_posix_clock_monotonic_gettime(&uptime);
24         monotonic_to_bootbased(&uptime);
25         nsec = cputime64_to_jiffies64(idletime) * TICK_NSEC;
26         idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
27         idle.tv_nsec = rem;
28         seq_printf(m, "%lu.%02lu %lu.%02lu\n",
29                         (unsigned long) uptime.tv_sec,
30                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
31                         (unsigned long) idle.tv_sec,
32                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
33         return 0;
34 }
35
36 static int uptime_proc_open(struct inode *inode, struct file *file)
37 {
38         return single_open(file, uptime_proc_show, NULL);
39 }
40
41 static const struct file_operations uptime_proc_fops = {
42         .open           = uptime_proc_open,
43         .read           = seq_read,
44         .llseek         = seq_lseek,
45         .release        = single_release,
46 };
47
48 static int __init proc_uptime_init(void)
49 {
50         proc_create("uptime", 0, NULL, &uptime_proc_fops);
51         return 0;
52 }
53 module_init(proc_uptime_init);