*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
/* getopt not needed */
-#include <stdio.h>
-#include <errno.h>
-#include <stdlib.h>
-#include "busybox.h"
+//usage:#define free_trivial_usage
+//usage: "" IF_DESKTOP("[-b/k/m/g]")
+//usage:#define free_full_usage "\n\n"
+//usage: "Display the amount of free and used system memory"
+//usage:
+//usage:#define free_example_usage
+//usage: "$ free\n"
+//usage: " total used free shared buffers\n"
+//usage: " Mem: 257628 248724 8904 59644 93124\n"
+//usage: " Swap: 128516 8404 120112\n"
+//usage: "Total: 386144 257128 129016\n"
-int free_main(int argc, char **argv)
+#include "libbb.h"
+#ifdef __linux__
+# include <sys/sysinfo.h>
+#endif
+
+struct globals {
+ unsigned mem_unit;
+#if ENABLE_DESKTOP
+ unsigned unit_steps;
+# define G_unit_steps G.unit_steps
+#else
+# define G_unit_steps 10
+#endif
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { } while (0)
+
+
+static unsigned long long scale(unsigned long d)
+{
+ return ((unsigned long long)d * G.mem_unit) >> G_unit_steps;
+}
+
+
+int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
{
struct sysinfo info;
- sysinfo(&info);
- /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
- if (info.mem_unit==0) {
- info.mem_unit=1;
- }
- if ( info.mem_unit == 1 ) {
- info.mem_unit=1024;
+ INIT_G();
- /* TODO: Make all this stuff not overflow when mem >= 4 Gib */
- info.totalram/=info.mem_unit;
- info.freeram/=info.mem_unit;
-#ifndef __uClinux__
- info.totalswap/=info.mem_unit;
- info.freeswap/=info.mem_unit;
-#endif
- info.sharedram/=info.mem_unit;
- info.bufferram/=info.mem_unit;
- } else {
- info.mem_unit/=1024;
- /* TODO: Make all this stuff not overflow when mem >= 4 Gib */
- info.totalram*=info.mem_unit;
- info.freeram*=info.mem_unit;
-#ifndef __uClinux__
- info.totalswap*=info.mem_unit;
- info.freeswap*=info.mem_unit;
-#endif
- info.sharedram*=info.mem_unit;
- info.bufferram*=info.mem_unit;
+#if ENABLE_DESKTOP
+ G.unit_steps = 10;
+ if (argv[1] && argv[1][0] == '-') {
+ switch (argv[1][1]) {
+ case 'b':
+ G.unit_steps = 0;
+ break;
+ case 'k': /* 2^10 */
+ /* G.unit_steps = 10; - already is */
+ break;
+ case 'm': /* 2^(2*10) */
+ G.unit_steps = 20;
+ break;
+ case 'g': /* 2^(3*10) */
+ G.unit_steps = 30;
+ break;
+ default:
+ bb_show_usage();
+ }
}
+#endif
- if (argc > 1 && **(argv + 1) == '-')
- bb_show_usage();
+ sysinfo(&info);
- printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
- "shared", "buffers");
+ /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
+ G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
- printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
- info.totalram-info.freeram, info.freeram,
- info.sharedram, info.bufferram);
+ printf(" %13s%13s%13s%13s%13s\n",
+ "total",
+ "used",
+ "free",
+ "shared", "buffers" /* swap and total don't have these columns */
+ /* procps version 3.2.8 also shows "cached" column, but
+ * sysinfo() does not provide this value, need to parse
+ * /proc/meminfo instead and get "Cached: NNN kB" from there.
+ */
+ );
-#ifndef __uClinux__
- printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
- info.totalswap-info.freeswap, info.freeswap);
+#define FIELDS_5 "%13llu%13llu%13llu%13llu%13llu\n"
+#define FIELDS_3 (FIELDS_5 + 2*6)
+#define FIELDS_2 (FIELDS_5 + 3*6)
- printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
- (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
- info.freeram+info.freeswap);
+ printf("Mem: ");
+ printf(FIELDS_5,
+ scale(info.totalram),
+ scale(info.totalram - info.freeram),
+ scale(info.freeram),
+ scale(info.sharedram),
+ scale(info.bufferram)
+ );
+ /* Show alternate, more meaningful busy/free numbers by counting
+ * buffer cache as free memory (make it "-/+ buffers/cache"
+ * if/when we add support for "cached" column): */
+ printf("-/+ buffers: ");
+ printf(FIELDS_2,
+ scale(info.totalram - info.freeram - info.bufferram),
+ scale(info.freeram + info.bufferram)
+ );
+#if BB_MMU
+ printf("Swap:");
+ printf(FIELDS_3,
+ scale(info.totalswap),
+ scale(info.totalswap - info.freeswap),
+ scale(info.freeswap)
+ );
#endif
return EXIT_SUCCESS;
}
-