info.c

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    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/mm.h>
   10 #include <linux/unistd.h>
   11 #include <linux/swap.h>
   12 #include <linux/smp_lock.h>
   13 
   14 #include <asm/uaccess.h>
   15 
   16 asmlinkage long sys_sysinfo(struct sysinfo *info)
   17 {
   18         struct sysinfo val;
   19 
   20         memset((char *)&val, 0, sizeof(struct sysinfo));
   21 
   22         cli();
   23         val.uptime = jiffies / HZ;
   24 
   25         val.loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
   26         val.loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
   27         val.loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);
   28 
   29         val.procs = nr_threads-1;
   30         sti();
   31 
   32         si_meminfo(&val);
   33         si_swapinfo(&val);
   34 
   35         {
   36                 unsigned long mem_total, sav_total;
   37                 unsigned int mem_unit, bitcount;
   38 
   39                 /* If the sum of all the available memory (i.e. ram + swap)
   40                  * is less than can be stored in a 32 bit unsigned long then
   41                  * we can be binary compatible with 2.2.x kernels.  If not,
   42                  * well, in that case 2.2.x was broken anyways...
   43                  *
   44                  *  -Erik Andersen <andersee@debian.org> */
   45 
   46                 mem_total = val.totalram + val.totalswap;
   47                 if (mem_total < val.totalram || mem_total < val.totalswap)
   48                         goto out;
   49                 bitcount = 0;
   50                 mem_unit = val.mem_unit;
   51                 while (mem_unit > 1) {
   52                         bitcount++;
   53                         mem_unit >>= 1;
   54                         sav_total = mem_total;
   55                         mem_total <<= 1;
   56                         if (mem_total < sav_total)
   57                                 goto out;
   58                 }
   59 
   60                 /* If mem_total did not overflow, multiply all memory values by
   61                  * val.mem_unit and set it to 1.  This leaves things compatible
   62                  * with 2.2.x, and also retains compatibility with earlier 2.4.x
   63                  * kernels...  */
   64 
   65                 val.mem_unit = 1;
   66                 val.totalram <<= bitcount;
   67                 val.freeram <<= bitcount;
   68                 val.sharedram <<= bitcount;
   69                 val.bufferram <<= bitcount;
   70                 val.totalswap <<= bitcount;
   71                 val.freeswap <<= bitcount;
   72                 val.totalhigh <<= bitcount;
   73                 val.freehigh <<= bitcount;
   74         }
   75 out:
   76         if (copy_to_user(info, &val, sizeof(struct sysinfo)))
   77                 return -EFAULT;
   78         return 0;
   79 }

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FreeBSD/Linux Kernel Cross Reference sys/kernel/info.c

FreeBSD/Linux Kernel Cross Reference
sys/kernel/info.c