I just wrote an implementation of this recently... this works:

public class sysinfo {

private static SysinfoInterface delegate = (SysinfoInterface)Native.loadLibrary( "c", SysinfoInterface.class);

public static class SysinfoStructure extends Structure { public long uptime; /* Seconds since boot */ public long[] loads = new long[3]; /* 1, 5, and 15 minute load averages */ public long totalram; /* Total usable main memory size */ public long freeram; /* Available memory size */ public long sharedram; /* Amount of shared memory */ public long bufferram; /* Memory used by buffers */ public long totalswap; /* Total swap space size */ public long freeswap; /* swap space still available */ public short procs; /* Number of current processes */ public long totalhigh; /* Total high memory size */ public long freehigh; /* Available high memory size */ public int mem_unit; /* Memory unit size in bytes */ //char _f[ 20-2*sizeof(long)-sizeof(int)]; /* Padding for libc5 */ };

public static SysinfoStructure sysinfo() { SysinfoStructure result = new SysinfoStructure(); delegate.sysinfo( result ); return result; }

}

interface SysinfoInterface extends Library {

void sysinfo(sysinfo.SysinfoStructure sysinfo);