+ 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");