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TOMOYO Linux Cross Reference
Linux/fs/proc/uptime.c

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  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         int i;
 15         cputime_t idletime = cputime_zero;
 16 
 17         for_each_possible_cpu(i)
 18                 idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);
 19 
 20         do_posix_clock_monotonic_gettime(&uptime);
 21         monotonic_to_bootbased(&uptime);
 22         cputime_to_timespec(idletime, &idle);
 23         seq_printf(m, "%lu.%02lu %lu.%02lu\n",
 24                         (unsigned long) uptime.tv_sec,
 25                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 26                         (unsigned long) idle.tv_sec,
 27                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 28         return 0;
 29 }
 30 
 31 static int uptime_proc_open(struct inode *inode, struct file *file)
 32 {
 33         return single_open(file, uptime_proc_show, NULL);
 34 }
 35 
 36 static const struct file_operations uptime_proc_fops = {
 37         .open           = uptime_proc_open,
 38         .read           = seq_read,
 39         .llseek         = seq_lseek,
 40         .release        = single_release,
 41 };
 42 
 43 static int __init proc_uptime_init(void)
 44 {
 45         proc_create("uptime", 0, NULL, &uptime_proc_fops);
 46         return 0;
 47 }
 48 module_init(proc_uptime_init);
 49 

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