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annotate toys/free.c @ 466:9f1e089262cb

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Adding free and uptime
author Elie De Brauwer <eliedebrauwer@gmail.com>
date Mon, 13 Feb 2012 17:15:49 +0100
parents
children 2d50fee68ca1
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466
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * free.c - Display amount of free and used memory in the system.
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4 *
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5 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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6 *
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7 * Not in SUSv3.
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8
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9 USE_FREE(NEWTOY(free, "gmkb", TOYFLAG_USR|TOYFLAG_BIN))
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10
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11 config FREE
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12 bool "free"
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13 default y
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14 help
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15 usage: free [-bkmg]
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16
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17 Display the total, free and used amount of physical memory and
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18 swap space.
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19 -bkmg Output in bytes (default), KB, MB or GB
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20 */
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21
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22 #include "toys.h"
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23 #include <sys/sysinfo.h>
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24
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25
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26 static unsigned long long convert(unsigned long d, unsigned int iscale,
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27 unsigned int oscale)
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28 {
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29 return ((unsigned long long)d*iscale)>>oscale;
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30 }
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31
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32 void free_main(void)
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33 {
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34 struct sysinfo info;
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35 unsigned int iscale = 1;
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36 unsigned int oscale = 0;
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37
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38 sysinfo(&info);
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39 if (info.mem_unit) iscale = info.mem_unit;
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40 if (toys.optflags & 1) oscale = 0;
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41 if (toys.optflags & 2) oscale = 10;
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42 if (toys.optflags & 4) oscale = 20;
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43 if (toys.optflags & 8) oscale = 30;
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44
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45 printf(" total used free shared buffers\n");
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46 printf("Mem: %12llu%12llu%12llu%12llu%12llu\n",
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47 convert(info.totalram, iscale, oscale),
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48 convert(info.totalram-info.freeram, iscale, oscale),
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49 convert(info.freeram, iscale, oscale),
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50 convert(info.sharedram, iscale, oscale),
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51 convert(info.bufferram, iscale, oscale));
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52
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53 printf("-/+ buffers/cache: %12llu%12llu\n",
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54 convert(info.totalram - info.freeram - info.bufferram, iscale, oscale),
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55 convert(info.freeram + info.bufferram, iscale, oscale));
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56
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57 printf("Swap: %12llu%12llu%12llu\n",
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58 convert(info.totalswap, iscale, oscale),
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59 convert(info.totalswap - info.freeswap, iscale, oscale),
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60 convert(info.freeswap, iscale, oscale));
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61 }