kernel/info.c

   1 /*
   2  * linux/kernel/info.c
   3  *
   4  * Copyright (C) 1992 Darren Senn
   5  */
   6
   7 /* This implements the sysinfo() system call */
   8
   9 #include <linux/sched.h>
  10 #include <linux/string.h>
  11 #include <linux/unistd.h>
  12 #include <linux/types.h>
  13 #include <linux/mm.h>
  14 #include <linux/swap.h>
  15 #include <linux/smp.h>
  16 #include <linux/smp_lock.h>
  17
  18 #include <asm/uaccess.h>
  19
  20 asmlinkage int sys_sysinfo(struct sysinfo *info)
  21 {
  22         struct sysinfo val;
  23
  24         memset((char *)&val, 0, sizeof(struct sysinfo));
  25
  26         cli();
  27         val.uptime = jiffies / HZ;
  28
  29         val.loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
  30         val.loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
  31         val.loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);
  32
  33         val.procs = nr_tasks-1;
  34         sti();
  35
  36         si_meminfo(&val);
  37         si_swapinfo(&val);
  38
  39         if (copy_to_user(info, &val, sizeof(struct sysinfo)))
  40                 return -EFAULT;
  41         return 0;
  42 }