123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
// free.c - free(1)
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// procps utility to display free memory information
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//
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// All new, Robert Love <rml@tech9.net> 18 Nov 2002
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// Original by Brian Edmonds and Rafal Maszkowski 14 Dec 1992
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//
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// This program is licensed under the GNU Library General Public License, v2
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//
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// Copyright 2003 Robert Love
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// Copyright 2004 Albert Cahalan
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#include "proc/sysinfo.h"
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#include "proc/version.h"
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//#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define S(X) ( ((unsigned long long)(X) << 10) >> shift)
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const char help_message[] =
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"usage: free [-b|-k|-m|-g] [-l] [-o] [-t] [-s delay] [-c count] [-V]\n"
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" -b,-k,-m,-g show output in bytes, KB, MB, or GB\n"
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" -l show detailed low and high memory statistics\n"
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" -o use old format (no -/+buffers/cache line)\n"
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" -t display total for RAM + swap\n"
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" -s update every [delay] seconds\n"
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" -c update [count] times\n"
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" -V display version information and exit\n"
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;
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int main(int argc, char *argv[]){
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int i;
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int count = 0;
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int shift = 10;
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int pause_length = 0;
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int show_high = 0;
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int show_total = 0;
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int old_fmt = 0;
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/* check startup flags */
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while( (i = getopt(argc, argv, "bkmglotc:s:V") ) != -1 )
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switch (i) {
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case 'b': shift = 0; break;
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case 'k': shift = 10; break;
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case 'm': shift = 20; break;
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case 'g': shift = 30; break;
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case 'l': show_high = 1; break;
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case 'o': old_fmt = 1; break;
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case 't': show_total = 1; break;
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case 's': pause_length = 1000000 * atof(optarg); break;
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case 'c': count = strtoul(optarg, NULL, 10); break;
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case 'V': display_version(); exit(0);
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default:
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fwrite(help_message,1,strlen(help_message),stderr);
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return 1;
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}
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do {
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meminfo();
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printf(" total used free shared buffers cached\n");
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printf(
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"%-7s %10Lu %10Lu %10Lu %10Lu %10Lu %10Lu\n", "Mem:",
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S(kb_main_total),
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S(kb_main_used),
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S(kb_main_free),
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S(kb_main_shared),
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S(kb_main_buffers),
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S(kb_main_cached)
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);
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// Print low vs. high information, if the user requested it.
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// Note we check if low_total==0: if so, then this kernel does
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// not export the low and high stats. Note we still want to
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// print the high info, even if it is zero.
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if (show_high) {
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printf(
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"%-7s %10Lu %10Lu %10Lu\n", "Low:",
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S(kb_low_total),
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S(kb_low_total - kb_low_free),
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S(kb_low_free)
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);
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printf(
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"%-7s %10Lu %10Lu %10Lu\n", "High:",
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S(kb_high_total),
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S(kb_high_total - kb_high_free),
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S(kb_high_free)
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);
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}
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if(!old_fmt){
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unsigned KLONG buffers_plus_cached = kb_main_buffers + kb_main_cached;
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printf(
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"-/+ buffers/cache: %10Lu %10Lu\n",
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S(kb_main_used - buffers_plus_cached),
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S(kb_main_free + buffers_plus_cached)
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);
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}
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printf(
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"%-7s %10Lu %10Lu %10Lu\n", "Swap:",
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S(kb_swap_total),
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S(kb_swap_used),
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S(kb_swap_free)
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);
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if(show_total){
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printf(
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"%-7s %10Lu %10Lu %10Lu\n", "Total:",
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S(kb_main_total + kb_swap_total),
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S(kb_main_used + kb_swap_used),
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S(kb_main_free + kb_swap_free)
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);
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}
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if(pause_length){
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fputc('\n', stdout);
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fflush(stdout);
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if (count != 1) usleep(pause_length);
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}
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} while(pause_length && --count);
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return 0;
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}
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