Initial implementation of wget, from Chip Rosenthal <chip@laserlink.net>.

[oweals/busybox.git] / free.c

diff --git a/free.c b/free.c
index 39594dbe527422c47ad906717fde3b505e668013..78298cfb6422a55e04df5d5654cb657d0744555d 100644 (file)
--- a/free.c
+++ b/free.c
@@ -23,20 +23,37 @@
 
 #include "internal.h"
 #include <stdio.h>
-#include <sys/sysinfo.h>
+#include <errno.h>
 
-#define DIVISOR        1024
 extern int free_main(int argc, char **argv)
 {
        struct sysinfo info;
        sysinfo(&info);
-       info.totalram/=DIVISOR;
-       info.freeram/=DIVISOR;
-       info.totalswap/=DIVISOR;
-       info.freeswap/=DIVISOR;
-       info.sharedram/=DIVISOR;
-       info.bufferram/=DIVISOR;
-
+       /* 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_usage);
 
        printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free", 
                        "shared", "buffers");
@@ -51,5 +68,7 @@ extern int free_main(int argc, char **argv)
        printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
                        (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
                        info.freeram+info.freeswap);
-       exit(TRUE);
+       return(TRUE);
 }
+
+