#include <linux/init.h> #include <linux/proc_fs.h> #include <linux/sched.h> #include <linux/time.h> #include <asm/cputime.h> static int proc_calc_metrics(char *page, char **start, off_t off, int count, int *eof, int len) { if (len <= off + count) *eof = 1; *start = page + off; len -= off; if (len > count) len = count; if (len < 0) len = 0; return len; } static int uptime_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data) { struct timespec uptime; struct timespec idle; int len; cputime_t idletime = cputime_add(init_task.utime, init_task.stime); do_posix_clock_monotonic_gettime(&uptime); monotonic_to_bootbased(&uptime); cputime_to_timespec(idletime, &idle); len = sprintf(page, "%lu.%02lu %lu.%02lu\n", (unsigned long) uptime.tv_sec, (uptime.tv_nsec / (NSEC_PER_SEC / 100)), (unsigned long) idle.tv_sec, (idle.tv_nsec / (NSEC_PER_SEC / 100))); return proc_calc_metrics(page, start, off, count, eof, len); } static int __init proc_uptime_init(void) { create_proc_read_entry("uptime", 0, NULL, uptime_read_proc, NULL); return 0; } module_init(proc_uptime_init);