Use global applet_name instead of local versions.

[oweals/busybox.git] / free.c

diff --git a/free.c b/free.c
index b07135430f6bd93fefe465cb1b252616c06d4650..997430b39e106ad3834680ea82a5c9863e4b8ee8 100644 (file)
--- a/free.c
+++ b/free.c
@@ -2,7 +2,7 @@
 /*
  * Mini free implementation for busybox
  *
- * Copyright (C) 1999 by Lineo, inc.
+ * Copyright (C) 1999,2000 by Lineo, inc.
  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -23,15 +23,59 @@
 
 #include "internal.h"
 #include <stdio.h>
+#include <errno.h>
 
 
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
-#endif
-
 extern int free_main(int argc, char **argv)
 {
-       char *cmd[] = { "cat", "/proc/meminfo", "\0" };
+       struct sysinfo info;
+       sysinfo(&info);
+       /* Kernels prior to 2.4.x will return info.mem_unit==0.  Kernels after
+        * 2.4.x actually fill this value in */
+       if (info.mem_unit==0) {
+               /* Looks like we have a kernel prior to Linux 2.4.x */
+               info.mem_unit=1024;
+               info.totalram/=info.mem_unit;
+               info.freeram/=info.mem_unit;
+               info.totalswap/=info.mem_unit;
+               info.freeswap/=info.mem_unit;
+               info.sharedram/=info.mem_unit;
+               info.bufferram/=info.mem_unit;
+       } else {
+               /* Bah. Linux 2.4.x completely changed sysinfo. This can in theory
+               overflow a 32 bit unsigned long, but who puts more then 4GiB ram+swap
+               on an embedded system? */
+               info.mem_unit/=1024;
+               info.totalram*=info.mem_unit;
+               info.freeram*=info.mem_unit;
+               info.totalswap*=info.mem_unit;
+               info.freeswap*=info.mem_unit;
+               info.sharedram*=info.mem_unit;
+               info.bufferram*=info.mem_unit;
+       }
+       if (argc > 1 && **(argv + 1) == '-') {
+               usage("free\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+                               "\nDisplays the amount of free and used system memory\n"
+#endif
+                               );
+       }
+
+
+       printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free", 
+                       "shared", "buffers");
 
-       exit(cat_main(3, cmd));
+       printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram, 
+                       info.totalram-info.freeram, info.freeram, 
+                       info.sharedram, info.bufferram);
+
+       printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
+                       info.totalswap-info.freeswap, info.freeswap);
+
+       printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
+                       (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
+                       info.freeram+info.freeswap);
+       return(TRUE);
 }
+
+