+
+ return 0;
+ }
+
+ private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
+ SocketFD fd = getSocketFD(fdn);
+ if(flags != 0) throw new ErrnoException(EINVAL);
+
+ int word1 = memRead(destAddr);
+ if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
+ int port = word1 & 0xffff;
+ InetAddress inetAddr;
+ byte[] ip = new byte[4];
+ copyin(destAddr+4,ip,4);
+ try {
+ inetAddr = Platform.inetAddressFromBytes(ip);
+ } catch(UnknownHostException e) {
+ return -EADDRNOTAVAIL;
+ }
+
+ count = Math.min(count,MAX_CHUNK);
+ byte[] buf = byteBuf(count);
+ copyin(addr,buf,count);
+ try {
+ return fd.sendto(buf,0,count,inetAddr,port);
+ } catch(ErrnoException e) {
+ if(e.errno == EPIPE) exit(128+13,true);
+ throw e;
+ }
+ }
+
+ private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
+ SocketFD fd = getSocketFD(fdn);
+ if(flags != 0) throw new ErrnoException(EINVAL);
+
+ InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
+ int[] port = sourceAddr == 0 ? null : new int[1];
+
+ count = Math.min(count,MAX_CHUNK);
+ byte[] buf = byteBuf(count);
+ int n = fd.recvfrom(buf,0,count,inetAddr,port);
+ copyout(buf,addr,n);
+
+ if(sourceAddr != 0) {
+ memWrite(sourceAddr,(AF_INET << 16) | port[0]);
+ byte[] ip = inetAddr[0].getAddress();
+ copyout(ip,sourceAddr+4,4);
+ }
+
+ return n;
+ }
+
+ private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
+ return -ENOSYS;
+ }
+
+ private static String hostName() {
+ try {
+ return InetAddress.getLocalHost().getHostName();
+ } catch(UnknownHostException e) {
+ return "darkstar";
+ }
+ }
+
+ private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
+ if(newp != 0) return -EPERM;
+ if(namelen == 0) return -ENOENT;
+ if(oldp == 0) return 0;
+
+ Object o = null;
+ switch(memRead(nameaddr)) {
+ case CTL_KERN:
+ if(namelen != 2) break;
+ switch(memRead(nameaddr+4)) {
+ case KERN_OSTYPE: o = "NestedVM"; break;
+ case KERN_HOSTNAME: o = hostName(); break;
+ case KERN_OSRELEASE: o = VERSION; break;
+ case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
+ }
+ break;
+ case CTL_HW:
+ if(namelen != 2) break;
+ switch(memRead(nameaddr+4)) {
+ case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
+ }
+ break;
+ }
+ if(o == null) return -ENOENT;
+ int len = memRead(oldlenaddr);
+ if(o instanceof String) {
+ byte[] b = getNullTerminatedBytes((String)o);
+ if(len < b.length) return -ENOMEM;
+ len = b.length;
+ copyout(b,oldp,len);
+ memWrite(oldlenaddr,len);
+ } else if(o instanceof Integer) {
+ if(len < 4) return -ENOMEM;
+ memWrite(oldp,((Integer)o).intValue());
+ } else {
+ throw new Error("should never happen");
+ }
+ return 0;