1 package org.ibex.nestedvm;
3 import org.ibex.nestedvm.util.*;
4 // HACK: This is ugly, this stuff needs to be in org.ibex.util or something
5 import org.ibex.classgen.util.Sort;
9 import java.lang.reflect.*; // For lazily linked RuntimeCompiler
13 public abstract class UnixRuntime extends Runtime implements Cloneable {
14 /** The pid of this "process" */
16 private UnixRuntime parent;
17 public final int getPid() { return pid; }
19 private static final GlobalState defaultGS = new GlobalState();
20 private GlobalState gs;
21 public void setGlobalState(GlobalState gs) {
22 if(state != STOPPED) throw new IllegalStateException("can't change GlobalState when running");
23 if(gs == null) throw new NullPointerException("gs is null");
27 /** proceses' current working directory - absolute path WITHOUT leading slash
28 "" = root, "bin" = /bin "usr/bin" = /usr/bin */
31 /** The runtime that should be run next when in state == EXECED */
32 private UnixRuntime execedRuntime;
34 private Object children; // used only for synchronizatin
35 private Vector activeChildren;
36 private Vector exitedChildren;
38 protected UnixRuntime(int pageSize, int totalPages) { this(pageSize,totalPages,false); }
39 protected UnixRuntime(int pageSize, int totalPages, boolean exec) {
40 super(pageSize,totalPages,exec);
44 String userdir = Platform.getProperty("user.dir");
45 String nvroot = Platform.getProperty("nestedvm.root");
47 if(userdir != null && nvroot == null) {
48 if(userdir.startsWith("/") && File.separatorChar == '/') {
49 cwd = userdir.substring(1);
51 Vector vec = new Vector();
52 File root = HostFS.hostRootDir();
53 String s = new File(userdir).getAbsolutePath();
55 System.err.println(s);
56 System.err.println(d);
57 while(!d.equals(root)) {
58 System.err.println("Got " + d.getName());
59 vec.addElement(d.getName());
60 if((s = d.getParent()) == null) break;
64 for(int i=vec.size()-1;i>=0;i--) cwd += (String) vec.elementAt(i) + (i==0?"":"/");
70 private static String posixTZ() {
71 StringBuffer sb = new StringBuffer();
72 TimeZone zone = TimeZone.getDefault();
73 int off = zone.getRawOffset() / 1000;
74 sb.append(Platform.timeZoneGetDisplayName(zone,false,false));
75 if(off > 0) sb.append("-");
77 sb.append(off/3600); off = off%3600;
78 if(off > 0) sb.append(":").append(off/60); off=off%60;
79 if(off > 0) sb.append(":").append(off);
80 if(zone.useDaylightTime())
81 sb.append(Platform.timeZoneGetDisplayName(zone,true,false));
85 private static boolean envHas(String key,String[] environ) {
86 for(int i=0;i<environ.length;i++)
87 if(environ[i]!=null && environ[i].startsWith(key + "=")) return true;
91 String[] createEnv(String[] extra) {
92 String[] defaults = new String[6];
94 if(extra == null) extra = new String[0];
95 if(!envHas("USER",extra) && Platform.getProperty("user.name") != null)
96 defaults[n++] = "USER=" + Platform.getProperty("user.name");
97 if(!envHas("HOME",extra) && Platform.getProperty("user.home") != null)
98 defaults[n++] = "HOME=" + Platform.getProperty("user.home");
99 if(!envHas("SHELL",extra)) defaults[n++] = "SHELL=/bin/sh";
100 if(!envHas("TERM",extra) && !win32Hacks) defaults[n++] = "TERM=vt100";
101 if(!envHas("TZ",extra)) defaults[n++] = "TZ=" + posixTZ();
102 if(!envHas("PATH",extra)) defaults[n++] = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin";
103 String[] env = new String[extra.length+n];
104 for(int i=0;i<n;i++) env[i] = defaults[i];
105 for(int i=0;i<extra.length;i++) env[n++] = extra[i];
109 private static class ProcessTableFullExn extends RuntimeException { }
112 UnixRuntime[] tasks = gs.tasks;
115 UnixRuntime prev = tasks[pid];
116 if(prev == null || prev == this || prev.pid != pid || prev.parent != parent)
117 throw new Error("should never happen");
118 synchronized(parent.children) {
119 int i = parent.activeChildren.indexOf(prev);
120 if(i == -1) throw new Error("should never happen");
121 parent.activeChildren.setElementAt(this,i);
125 int nextPID = gs.nextPID;
126 for(int i=nextPID;i<tasks.length;i++) if(tasks[i] == null) { newpid = i; break; }
127 if(newpid == -1) for(int i=1;i<nextPID;i++) if(tasks[i] == null) { newpid = i; break; }
128 if(newpid == -1) throw new ProcessTableFullExn();
130 gs.nextPID = newpid + 1;
136 int _syscall(int syscall, int a, int b, int c, int d, int e, int f) throws ErrnoException, FaultException {
138 case SYS_kill: return sys_kill(a,b);
139 case SYS_fork: return sys_fork();
140 case SYS_pipe: return sys_pipe(a);
141 case SYS_dup2: return sys_dup2(a,b);
142 case SYS_dup: return sys_dup(a);
143 case SYS_waitpid: return sys_waitpid(a,b,c);
144 case SYS_stat: return sys_stat(a,b);
145 case SYS_lstat: return sys_lstat(a,b);
146 case SYS_mkdir: return sys_mkdir(a,b);
147 case SYS_getcwd: return sys_getcwd(a,b);
148 case SYS_chdir: return sys_chdir(a);
149 case SYS_exec: return sys_exec(a,b,c);
150 case SYS_getdents: return sys_getdents(a,b,c,d);
151 case SYS_unlink: return sys_unlink(a);
152 case SYS_getppid: return sys_getppid();
153 case SYS_socket: return sys_socket(a,b,c);
154 case SYS_connect: return sys_connect(a,b,c);
155 case SYS_resolve_hostname: return sys_resolve_hostname(a,b,c);
156 case SYS_setsockopt: return sys_setsockopt(a,b,c,d,e);
157 case SYS_getsockopt: return sys_getsockopt(a,b,c,d,e);
158 case SYS_bind: return sys_bind(a,b,c);
159 case SYS_listen: return sys_listen(a,b);
160 case SYS_accept: return sys_accept(a,b,c);
161 case SYS_shutdown: return sys_shutdown(a,b);
162 case SYS_sysctl: return sys_sysctl(a,b,c,d,e,f);
163 case SYS_sendto: return sys_sendto(a,b,c,d,e,f);
164 case SYS_recvfrom: return sys_recvfrom(a,b,c,d,e,f);
165 case SYS_select: return sys_select(a,b,c,d,e);
167 default: return super._syscall(syscall,a,b,c,d,e,f);
171 FD _open(String path, int flags, int mode) throws ErrnoException {
172 return gs.open(this,normalizePath(path),flags,mode);
175 private int sys_getppid() {
176 return parent == null ? 1 : parent.pid;
179 // FEATURE: Signal handling
180 // check flag only on backwards jumps to basic blocks without compulsatory checks
181 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
183 /** The kill syscall.
184 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
185 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
186 Anything else terminates the process. */
187 private int sys_kill(int pid, int signal) {
188 // This will only be called by raise() in newlib to invoke the default handler
189 // We don't have to worry about actually delivering the signal
190 if(pid != pid) return -ESRCH;
191 if(signal < 0 || signal >= 32) return -EINVAL;
204 exit(128+signal, true);
209 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
210 final int WNOHANG = 1;
211 if((options & ~(WNOHANG)) != 0) return -EINVAL;
212 if(pid == 0 || pid < -1) {
213 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
216 boolean blocking = (options&WNOHANG)==0;
218 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
219 if(children == null) return blocking ? -ECHILD : 0;
221 UnixRuntime done = null;
223 synchronized(children) {
226 if(exitedChildren.size() > 0) {
227 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
228 exitedChildren.removeElementAt(exitedChildren.size() - 1);
231 if(pid >= gs.tasks.length) return -ECHILD;
232 UnixRuntime t = gs.tasks[pid];
233 if(t.parent != this) return -ECHILD;
234 if(t.state == EXITED) {
235 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
239 // process group stuff, EINVAL returned above
240 throw new Error("should never happen");
243 if(!blocking) return 0;
244 try { children.wait(); } catch(InterruptedException e) {}
245 //System.err.println("waitpid woke up: " + exitedChildren.size());
247 gs.tasks[done.pid] = null;
252 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
258 if(children != null) synchronized(children) {
259 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
260 UnixRuntime child = (UnixRuntime) e.nextElement();
261 gs.tasks[child.pid] = null;
263 exitedChildren.removeAllElements();
264 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
265 UnixRuntime child = (UnixRuntime) e.nextElement();
268 activeChildren.removeAllElements();
271 UnixRuntime _parent = parent;
272 if(_parent == null) {
273 gs.tasks[pid] = null;
275 synchronized(_parent.children) {
277 gs.tasks[pid] = null;
279 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
280 parent.exitedChildren.addElement(this);
281 parent.children.notify();
287 protected Object clone() throws CloneNotSupportedException {
288 UnixRuntime r = (UnixRuntime) super.clone();
292 r.activeChildren = r.exitedChildren = null;
296 private int sys_fork() {
300 r = (UnixRuntime) clone();
301 } catch(Exception e) {
310 } catch(ProcessTableFullExn e) {
314 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
315 if(children == null) {
316 children = new Object();
317 activeChildren = new Vector();
318 exitedChildren = new Vector();
320 activeChildren.addElement(r);
322 CPUState state = new CPUState();
324 state.r[V0] = 0; // return 0 to child
325 state.pc += 4; // skip over syscall instruction
326 r.setCPUState(state);
329 new ForkedProcess(r);
334 public static final class ForkedProcess extends Thread {
335 private final UnixRuntime initial;
336 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
337 public void run() { UnixRuntime.executeAndExec(initial); }
340 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
341 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
343 public static int executeAndExec(UnixRuntime r) {
346 if(r.execute()) break;
347 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
349 if(r.state != EXECED) return r.exitStatus();
354 private String[] readStringArray(int addr) throws ReadFaultException {
356 for(int p=addr;memRead(p) != 0;p+=4) count++;
357 String[] a = new String[count];
358 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
362 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
363 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
366 private final static Method runtimeCompilerCompile;
370 m = Class.forName("org.ibex.nestedvm.RuntimeCompiler").getMethod("compile",new Class[]{Seekable.class,String.class});
371 } catch(NoSuchMethodException e) {
373 } catch(ClassNotFoundException e) {
376 runtimeCompilerCompile = m;
379 public Class runtimeCompile(Seekable s) throws IOException {
380 if(runtimeCompilerCompile == null) {
381 if(STDERR_DIAG) System.err.println("WARNING: Exec attempted but RuntimeCompiler not found!");
386 return (Class) runtimeCompilerCompile.invoke(null,new Object[]{s,"unixruntime"});
387 } catch(IllegalAccessException e) {
390 } catch(InvocationTargetException e) {
391 Throwable t = e.getTargetException();
392 if(t instanceof IOException) throw (IOException) t;
393 if(t instanceof RuntimeException) throw (RuntimeException) t;
394 if(t instanceof Error) throw (Error) t;
395 if(STDERR_DIAG) t.printStackTrace();
400 private int exec(String path, String[] argv, String[] envp) throws ErrnoException {
401 if(argv.length == 0) argv = new String[]{""};
402 // HACK: Hideous hack to make a standalone busybox possible
403 if(path.equals("bin/busybox") && getClass().getName().endsWith("BusyBox"))
404 return execClass(getClass(),argv,envp);
406 // NOTE: For this little hack to work nestedvm.root MUST be "."
408 System.err.println("Execing normalized path: " + normalizedPath);
409 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
410 } catch(IOException e) { throw new Error(e); }*/
412 FStat fstat = gs.stat(this,path);
413 if(fstat == null) return -ENOENT;
414 GlobalState.CacheEnt ent = (GlobalState.CacheEnt) gs.execCache.get(path);
415 long mtime = fstat.mtime();
416 long size = fstat.size();
418 //System.err.println("Found cached entry for " + path);
419 if(ent.time ==mtime && ent.size == size) {
420 if(ent.o instanceof Class)
421 return execClass((Class) ent.o,argv,envp);
422 if(ent.o instanceof String[])
423 return execScript(path,(String[]) ent.o,argv,envp);
424 throw new Error("should never happen");
426 //System.err.println("Cache was out of date");
427 gs.execCache.remove(path);
430 FD fd = gs.open(this,path,RD_ONLY,0);
431 if(fd == null) throw new ErrnoException(ENOENT);
432 Seekable s = fd.seekable();
433 if(s == null) throw new ErrnoException(EACCES);
435 byte[] buf = new byte[4096];
438 int n = s.read(buf,0,buf.length);
439 if(n == -1) throw new ErrnoException(ENOEXEC);
442 case '\177': // possible ELF
443 if(n < 4) s.tryReadFully(buf,n,4-n);
444 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') return -ENOEXEC;
446 Class c = runtimeCompile(s);
447 if(c == null) throw new ErrnoException(ENOEXEC);
448 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
449 return execClass(c,argv,envp);
452 int n2 = s.read(buf,1,buf.length-1);
453 if(n2 == -1) return -ENOEXEC;
456 if(buf[1] != '!') return -ENOEXEC;
460 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
462 if(p == buf.length) break OUTER;
463 n = s.read(buf,p,buf.length-p);
466 for(arg=2;arg<p;arg++) if(buf[arg] == ' ') break;
468 while(arg < p && buf[arg] == ' ') arg++;
469 String[] command = new String[] {
470 new String(buf,2,cmdEnd),
471 arg < p ? new String(buf,arg,p-arg) : null
473 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
474 return execScript(path,command,argv,envp);
478 } catch(IOException e) {
485 public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
486 String[] newArgv = new String[argv.length + command[1] != null ? 2 : 1];
487 int p = command[0].lastIndexOf('/');
488 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
490 if(command[1] != null) newArgv[p++] = command[1];
491 newArgv[p++] = "/" + path;
492 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
493 return exec(command[0],newArgv,envp);
496 public int execClass(Class c,String[] argv, String[] envp) {
498 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
499 return exec(r,argv,envp);
500 } catch(Exception e) {
506 private int exec(UnixRuntime r, String[] argv, String[] envp) {
507 //System.err.println("Execing " + r);
508 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
510 r.closeOnExec = closeOnExec;
511 // make sure this doesn't get messed with these since we didn't copy them
529 private final byte[] pipebuf = new byte[PIPE_BUF*4];
531 private int writePos;
533 public final FD reader = new Reader();
534 public final FD writer = new Writer();
536 public class Reader extends FD {
537 protected FStat _fstat() { return new SocketFStat(); }
538 public int read(byte[] buf, int off, int len) throws ErrnoException {
539 if(len == 0) return 0;
540 synchronized(Pipe.this) {
541 while(writePos != -1 && readPos == writePos) {
542 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
544 if(writePos == -1) return 0; // eof
545 len = Math.min(len,writePos-readPos);
546 System.arraycopy(pipebuf,readPos,buf,off,len);
548 if(readPos == writePos) Pipe.this.notify();
552 public int flags() { return O_RDONLY; }
553 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
556 public class Writer extends FD {
557 protected FStat _fstat() { return new SocketFStat(); }
558 public int write(byte[] buf, int off, int len) throws ErrnoException {
559 if(len == 0) return 0;
560 synchronized(Pipe.this) {
561 if(readPos == -1) throw new ErrnoException(EPIPE);
562 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
563 // not enough space to atomicly write the data
564 while(readPos != -1 && readPos != writePos) {
565 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
567 if(readPos == -1) throw new ErrnoException(EPIPE);
568 readPos = writePos = 0;
570 len = Math.min(len,pipebuf.length - writePos);
571 System.arraycopy(buf,off,pipebuf,writePos,len);
572 if(readPos == writePos) Pipe.this.notify();
577 public int flags() { return O_WRONLY; }
578 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
582 private int sys_pipe(int addr) {
583 Pipe pipe = new Pipe();
585 int fd1 = addFD(pipe.reader);
586 if(fd1 < 0) return -ENFILE;
587 int fd2 = addFD(pipe.writer);
588 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
592 memWrite(addr+4,fd2);
593 } catch(FaultException e) {
601 private int sys_dup2(int oldd, int newd) {
602 if(oldd == newd) return 0;
603 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
604 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
605 if(fds[oldd] == null) return -EBADFD;
606 if(fds[newd] != null) fds[newd].close();
607 fds[newd] = fds[oldd].dup();
611 private int sys_dup(int oldd) {
612 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
613 if(fds[oldd] == null) return -EBADFD;
614 FD fd = fds[oldd].dup();
615 int newd = addFD(fd);
616 if(newd < 0) { fd.close(); return -ENFILE; }
620 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
621 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
622 if(s == null) return -ENOENT;
626 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
627 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
628 if(s == null) return -ENOENT;
632 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
633 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
637 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
638 gs.unlink(this,normalizePath(cstring(cstring)));
642 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
643 byte[] b = getBytes(cwd);
644 if(size == 0) return -EINVAL;
645 if(size < b.length+2) return -ERANGE;
647 copyout(b,addr+1,b.length);
648 memset(addr+b.length+1,0,1);
652 private int sys_chdir(int addr) throws ErrnoException, FaultException {
653 String path = normalizePath(cstring(addr));
654 FStat st = gs.stat(this,path);
655 if(st == null) return -ENOENT;
656 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
661 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
662 count = Math.min(count,MAX_CHUNK);
663 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
664 if(fds[fdn] == null) return -EBADFD;
665 byte[] buf = byteBuf(count);
666 int n = fds[fdn].getdents(buf,0,count);
671 static class SocketFD extends FD {
672 public static final int TYPE_STREAM = 0;
673 public static final int TYPE_DGRAM = 1;
674 public static final int LISTEN = 2;
675 public int type() { return flags & 1; }
676 public boolean listen() { return (flags & 2) != 0; }
685 InetAddress bindAddr;
687 InetAddress connectAddr;
688 int connectPort = -1;
694 private static final byte[] EMPTY = new byte[0];
695 public SocketFD(int type) {
697 if(type == TYPE_DGRAM)
698 dp = new DatagramPacket(EMPTY,0);
701 public void setOptions() {
703 if(s != null && type() == TYPE_STREAM && !listen()) {
704 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
706 } catch(SocketException e) {
707 if(STDERR_DIAG) e.printStackTrace();
711 public void _close() {
713 if(s != null) s.close();
714 if(ss != null) ss.close();
715 if(ds != null) ds.close();
716 } catch(IOException e) {
721 public int read(byte[] a, int off, int length) throws ErrnoException {
722 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
723 if(is == null) throw new ErrnoException(EPIPE);
725 int n = is.read(a,off,length);
726 return n < 0 ? 0 : n;
727 } catch(IOException e) {
728 throw new ErrnoException(EIO);
732 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
733 if(type() == TYPE_STREAM) return read(a,off,length);
735 if(off != 0) throw new IllegalArgumentException("off must be 0");
737 dp.setLength(length);
739 if(ds == null) ds = new DatagramSocket();
741 } catch(IOException e) {
742 if(STDERR_DIAG) e.printStackTrace();
743 throw new ErrnoException(EIO);
745 if(sockAddr != null) {
746 sockAddr[0] = dp.getAddress();
747 port[0] = dp.getPort();
749 return dp.getLength();
752 public int write(byte[] a, int off, int length) throws ErrnoException {
753 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
755 if(os == null) throw new ErrnoException(EPIPE);
757 os.write(a,off,length);
759 } catch(IOException e) {
760 throw new ErrnoException(EIO);
764 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
765 if(off != 0) throw new IllegalArgumentException("off must be 0");
766 if(type() == TYPE_STREAM) return write(a,off,length);
768 if(destAddr == null) {
769 destAddr = connectAddr;
770 destPort = connectPort;
772 if(destAddr == null) throw new ErrnoException(ENOTCONN);
775 dp.setAddress(destAddr);
776 dp.setPort(destPort);
778 dp.setLength(length);
781 if(ds == null) ds = new DatagramSocket();
783 } catch(IOException e) {
784 if(STDERR_DIAG) e.printStackTrace();
785 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
786 throw new ErrnoException(EIO);
788 return dp.getLength();
791 public int flags() { return O_RDWR; }
792 public FStat _fstat() { return new SocketFStat(); }
795 private int sys_socket(int domain, int type, int proto) {
796 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
797 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
800 private SocketFD getSocketFD(int fdn) throws ErrnoException {
801 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
802 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
803 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
805 return (SocketFD) fds[fdn];
808 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
809 SocketFD fd = getSocketFD(fdn);
811 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
812 int word1 = memRead(addr);
813 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
814 int port = word1 & 0xffff;
815 byte[] ip = new byte[4];
818 InetAddress inetAddr;
820 inetAddr = Platform.inetAddressFromBytes(ip);
821 } catch(UnknownHostException e) {
822 return -EADDRNOTAVAIL;
825 fd.connectAddr = inetAddr;
826 fd.connectPort = port;
830 case SocketFD.TYPE_STREAM: {
831 Socket s = new Socket(inetAddr,port);
834 fd.is = s.getInputStream();
835 fd.os = s.getOutputStream();
838 case SocketFD.TYPE_DGRAM:
841 throw new Error("should never happen");
843 } catch(IOException e) {
844 return -ECONNREFUSED;
850 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
851 String hostname = cstring(chostname);
852 int size = memRead(sizeAddr);
853 InetAddress[] inetAddrs;
855 inetAddrs = InetAddress.getAllByName(hostname);
856 } catch(UnknownHostException e) {
857 return HOST_NOT_FOUND;
859 int count = min(size/4,inetAddrs.length);
860 for(int i=0;i<count;i++,addr+=4) {
861 byte[] b = inetAddrs[i].getAddress();
864 memWrite(sizeAddr,count*4);
868 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
869 SocketFD fd = getSocketFD(fdn);
875 if(len != 4) return -EINVAL;
876 int val = memRead(valaddr);
877 if(val != 0) fd.options |= name;
878 else fd.options &= ~name;
883 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
887 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
892 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
893 SocketFD fd = getSocketFD(fdn);
899 int len = memRead(lenaddr);
900 if(len < 4) return -EINVAL;
901 int val = (fd.options & name) != 0 ? 1 : 0;
902 memWrite(valaddr,val);
907 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
911 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
916 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
917 SocketFD fd = getSocketFD(fdn);
919 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
920 int word1 = memRead(addr);
921 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
922 int port = word1 & 0xffff;
923 InetAddress inetAddr = null;
924 if(memRead(addr+4) != 0) {
925 byte[] ip = new byte[4];
929 inetAddr = Platform.inetAddressFromBytes(ip);
930 } catch(UnknownHostException e) {
931 return -EADDRNOTAVAIL;
936 case SocketFD.TYPE_STREAM: {
937 fd.bindAddr = inetAddr;
941 case SocketFD.TYPE_DGRAM: {
942 if(fd.ds != null) fd.ds.close();
944 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
945 } catch(IOException e) {
951 throw new Error("should never happen");
955 private int sys_listen(int fdn, int backlog) throws ErrnoException {
956 SocketFD fd = getSocketFD(fdn);
957 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
958 if(fd.ss != null || fd.s != null) return -EISCONN;
959 if(fd.bindPort < 0) return -EOPNOTSUPP;
962 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
963 fd.flags |= SocketFD.LISTEN;
965 } catch(IOException e) {
971 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
972 SocketFD fd = getSocketFD(fdn);
973 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
974 if(!fd.listen()) return -EOPNOTSUPP;
976 int size = memRead(lenaddr);
978 ServerSocket s = fd.ss;
982 } catch(IOException e) {
987 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
988 byte[] b = client.getInetAddress().getAddress();
993 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
996 clientFD.is = client.getInputStream();
997 clientFD.os = client.getOutputStream();
998 } catch(IOException e) {
1001 int n = addFD(clientFD);
1002 if(n == -1) { clientFD.close(); return -ENFILE; }
1006 private int sys_shutdown(int fdn, int how) throws ErrnoException {
1007 SocketFD fd = getSocketFD(fdn);
1008 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
1009 if(fd.s == null) return -ENOTCONN;
1014 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
1015 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
1016 } catch(IOException e) {
1023 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
1024 SocketFD fd = getSocketFD(fdn);
1025 if(flags != 0) throw new ErrnoException(EINVAL);
1027 int word1 = memRead(destAddr);
1028 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1029 int port = word1 & 0xffff;
1030 InetAddress inetAddr;
1031 byte[] ip = new byte[4];
1032 copyin(destAddr+4,ip,4);
1034 inetAddr = Platform.inetAddressFromBytes(ip);
1035 } catch(UnknownHostException e) {
1036 return -EADDRNOTAVAIL;
1039 count = Math.min(count,MAX_CHUNK);
1040 byte[] buf = byteBuf(count);
1041 copyin(addr,buf,count);
1043 return fd.sendto(buf,0,count,inetAddr,port);
1044 } catch(ErrnoException e) {
1045 if(e.errno == EPIPE) exit(128+13,true);
1050 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
1051 SocketFD fd = getSocketFD(fdn);
1052 if(flags != 0) throw new ErrnoException(EINVAL);
1054 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
1055 int[] port = sourceAddr == 0 ? null : new int[1];
1057 count = Math.min(count,MAX_CHUNK);
1058 byte[] buf = byteBuf(count);
1059 int n = fd.recvfrom(buf,0,count,inetAddr,port);
1060 copyout(buf,addr,n);
1062 if(sourceAddr != 0) {
1063 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
1064 byte[] ip = inetAddr[0].getAddress();
1065 copyout(ip,sourceAddr+4,4);
1071 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
1075 private static String hostName() {
1077 return InetAddress.getLocalHost().getHostName();
1078 } catch(UnknownHostException e) {
1083 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
1084 if(newp != 0) return -EPERM;
1085 if(namelen == 0) return -ENOENT;
1086 if(oldp == 0) return 0;
1089 switch(memRead(nameaddr)) {
1091 if(namelen != 2) break;
1092 switch(memRead(nameaddr+4)) {
1093 case KERN_OSTYPE: o = "NestedVM"; break;
1094 case KERN_HOSTNAME: o = hostName(); break;
1095 case KERN_OSRELEASE: o = VERSION; break;
1096 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
1100 if(namelen != 2) break;
1101 switch(memRead(nameaddr+4)) {
1102 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
1106 if(o == null) return -ENOENT;
1107 int len = memRead(oldlenaddr);
1108 if(o instanceof String) {
1109 byte[] b = getNullTerminatedBytes((String)o);
1110 if(len < b.length) return -ENOMEM;
1112 copyout(b,oldp,len);
1113 memWrite(oldlenaddr,len);
1114 } else if(o instanceof Integer) {
1115 if(len < 4) return -ENOMEM;
1116 memWrite(oldp,((Integer)o).intValue());
1118 throw new Error("should never happen");
1123 public static final class GlobalState {
1124 Hashtable execCache = new Hashtable();
1126 final UnixRuntime[] tasks;
1129 private MP[] mps = new MP[0];
1132 public GlobalState() { this(255); }
1133 public GlobalState(int maxProcs) { this(maxProcs,true); }
1134 public GlobalState(int maxProcs, boolean defaultMounts) {
1135 tasks = new UnixRuntime[maxProcs+1];
1137 addMount("/",new HostFS());
1138 addMount("/dev",new DevFS());
1142 static class MP implements Sort.Comparable {
1143 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1146 public int compareTo(Object o) {
1147 if(!(o instanceof MP)) return 1;
1148 return -path.compareTo(((MP)o).path);
1152 public synchronized FS getMount(String path) {
1153 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1154 if(path.equals("/")) return root;
1155 path = path.substring(1);
1156 for(int i=0;i<mps.length;i++)
1157 if(mps[i].path.equals(path)) return mps[i].fs;
1161 public synchronized void addMount(String path, FS fs) {
1162 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1163 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1165 if(fs.owner != null) fs.owner.removeMount(fs);
1168 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1169 path = path.substring(1);
1170 int oldLength = mps.length;
1171 MP[] newMPS = new MP[oldLength + 1];
1172 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1173 newMPS[oldLength] = new MP(path,fs);
1177 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1178 fs.devno = highdevno + 2;
1181 public synchronized void removeMount(FS fs) {
1182 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1183 throw new IllegalArgumentException("mount point doesn't exist");
1186 public synchronized void removeMount(String path) {
1187 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1188 if(path.equals("/")) {
1191 path = path.substring(1);
1193 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1194 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1199 private void removeMount(int index) {
1200 if(index == -1) { root.owner = null; root = null; return; }
1201 MP[] newMPS = new MP[mps.length - 1];
1202 System.arraycopy(mps,0,newMPS,0,index);
1203 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1207 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1208 int pl = normalizedPath.length();
1211 synchronized(this) { list = mps; }
1212 for(int i=0;i<list.length;i++) {
1214 int mpl = mp.path.length();
1215 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1216 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1219 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1222 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1223 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1224 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1225 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1226 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1228 private static class CacheEnt {
1229 public final long time;
1230 public final long size;
1231 public final Object o;
1232 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1236 public abstract static class FS {
1237 static final int OPEN = 1;
1238 static final int STAT = 2;
1239 static final int LSTAT = 3;
1240 static final int MKDIR = 4;
1241 static final int UNLINK = 5;
1246 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1248 case OPEN: return open(r,path,arg1,arg2);
1249 case STAT: return stat(r,path);
1250 case LSTAT: return lstat(r,path);
1251 case MKDIR: mkdir(r,path,arg1); return null;
1252 case UNLINK: unlink(r,path); return null;
1253 default: throw new Error("should never happen");
1257 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1259 // If this returns null it'll be truned into an ENOENT
1260 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1261 // If this returns null it'll be turned into an ENOENT
1262 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1263 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1264 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1267 // chroot support should go in here if it is ever implemented chroot support in here
1268 private String normalizePath(String path) {
1269 boolean absolute = path.startsWith("/");
1270 int cwdl = cwd.length();
1272 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1273 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1274 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1276 char[] in = new char[path.length()+1];
1277 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1281 do { inp++; } while(in[inp] == '/');
1282 } else if(cwdl != 0) {
1283 cwd.getChars(0,cwdl,out,0);
1287 path.getChars(0,path.length(),in,0);
1288 while(in[inp] != 0) {
1290 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1291 if(in[inp] == '\0') break;
1292 while(in[inp] == '/') inp++;
1296 if(in[inp] == '\0') break;
1297 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1299 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1300 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1301 // Just read a /..{$,/}
1303 if(outp > 0) outp--;
1304 while(outp > 0 && out[outp] != '/') outp--;
1305 //System.err.println("After ..: " + new String(out,0,outp));
1308 // Just read a /.[^.] or /..[^/$]
1313 if(outp > 0 && out[outp-1] == '/') outp--;
1314 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1315 return new String(out,0,outp);
1318 FStat hostFStat(final File f, Object data) {
1321 FileInputStream fis = new FileInputStream(f);
1322 switch(fis.read()) {
1323 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1324 case '#': e = fis.read() == '!';
1327 } catch(IOException e2) { }
1328 HostFS fs = (HostFS) data;
1329 final int inode = fs.inodes.get(f.getAbsolutePath());
1330 final int devno = fs.devno;
1331 return new HostFStat(f,e) {
1332 public int inode() { return inode; }
1333 public int dev() { return devno; }
1337 FD hostFSDirFD(File f, Object _fs) {
1338 HostFS fs = (HostFS) _fs;
1339 return fs.new HostDirFD(f);
1342 public static class HostFS extends FS {
1343 InodeCache inodes = new InodeCache(4000);
1344 protected File root;
1345 public File getRoot() { return root; }
1347 static File hostRootDir() {
1348 if(Platform.getProperty("nestedvm.root") != null) {
1349 File f = new File(Platform.getProperty("nestedvm.root"));
1350 if(f.isDirectory()) return f;
1351 // fall through to case below
1353 String cwd = Platform.getProperty("user.dir");
1354 File f = new File(cwd != null ? cwd : ".");
1355 if(!f.exists()) throw new Error("Couldn't get File for cwd");
1356 f = new File(f.getAbsolutePath());
1357 while(f.getParent() != null) f = new File(f.getParent());
1358 // This works around a bug in some versions of ClassPath
1359 if(f.getPath().length() == 0) f = new File("/");
1363 private File hostFile(String path) {
1364 char sep = File.separatorChar;
1366 char buf[] = path.toCharArray();
1367 for(int i=0;i<buf.length;i++) {
1369 if(c == '/') buf[i] = sep;
1370 else if(c == sep) buf[i] = '/';
1372 path = new String(buf);
1374 return new File(root,path);
1377 public HostFS() { this(hostRootDir()); }
1378 public HostFS(String root) { this(new File(root)); }
1379 public HostFS(File root) { this.root = root; }
1382 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1383 final File f = hostFile(path);
1384 return r.hostFSOpen(f,flags,mode,this);
1387 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1388 File f = hostFile(path);
1389 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1390 if(!f.exists()) throw new ErrnoException(ENOENT);
1391 if(!f.delete()) throw new ErrnoException(EPERM);
1394 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1395 File f = hostFile(path);
1396 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1397 if(!f.exists()) return null;
1398 return r.hostFStat(f,this);
1401 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1402 File f = hostFile(path);
1403 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1404 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1405 if(f.exists()) throw new ErrnoException(ENOTDIR);
1406 File parent = getParentFile(f);
1407 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1408 if(!f.mkdir()) throw new ErrnoException(EIO);
1411 private static File getParentFile(File f) {
1412 String p = f.getParent();
1413 return p == null ? null : new File(f,p);
1416 public class HostDirFD extends DirFD {
1417 private final File f;
1418 private final File[] children;
1419 public HostDirFD(File f) {
1421 String[] l = f.list();
1422 children = new File[l.length];
1423 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1425 public int size() { return children.length; }
1426 public String name(int n) { return children[n].getName(); }
1427 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1428 public int parentInode() {
1429 File parent = getParentFile(f);
1430 // HACK: myInode() isn't really correct if we're not the root
1431 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1433 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1434 public int myDev() { return devno; }
1438 private static void putInt(byte[] buf, int off, int n) {
1439 buf[off+0] = (byte)((n>>>24)&0xff);
1440 buf[off+1] = (byte)((n>>>16)&0xff);
1441 buf[off+2] = (byte)((n>>> 8)&0xff);
1442 buf[off+3] = (byte)((n>>> 0)&0xff);
1445 public static abstract class DirFD extends FD {
1446 private int pos = -2;
1448 protected abstract int size();
1449 protected abstract String name(int n);
1450 protected abstract int inode(int n);
1451 protected abstract int myDev();
1452 protected abstract int parentInode();
1453 protected abstract int myInode();
1454 public int flags() { return O_RDONLY; }
1456 public int getdents(byte[] buf, int off, int len) {
1460 OUTER: for(;len > 0 && pos < size();pos++){
1464 ino = pos == -1 ? parentInode() : myInode();
1465 if(ino == -1) continue;
1466 reclen = 9 + (pos == -1 ? 2 : 1);
1467 if(reclen > len) break OUTER;
1469 if(pos == -1) buf[off+9] = '.';
1472 String f = name(pos);
1473 byte[] fb = getBytes(f);
1474 reclen = fb.length + 9;
1475 if(reclen > len) break OUTER;
1477 System.arraycopy(fb,0,buf,off+8,fb.length);
1480 buf[off+reclen-1] = 0; // null terminate
1481 reclen = (reclen + 3) & ~3; // add padding
1482 putInt(buf,off,reclen);
1483 putInt(buf,off+4,ino);
1490 protected FStat _fstat() {
1491 return new FStat() {
1492 public int type() { return S_IFDIR; }
1493 public int inode() { return myInode(); }
1494 public int dev() { return myDev(); }
1499 public static class DevFS extends FS {
1500 private static final int ROOT_INODE = 1;
1501 private static final int NULL_INODE = 2;
1502 private static final int ZERO_INODE = 3;
1503 private static final int FD_INODE = 4;
1504 private static final int FD_INODES = 32;
1506 private abstract class DevFStat extends FStat {
1507 public int dev() { return devno; }
1508 public int mode() { return 0666; }
1509 public int type() { return S_IFCHR; }
1510 public int nlink() { return 1; }
1511 public abstract int inode();
1514 private abstract class DevDirFD extends DirFD {
1515 public int myDev() { return devno; }
1518 private FD devZeroFD = new FD() {
1519 public int read(byte[] a, int off, int length) {
1520 /*Arrays.fill(a,off,off+length,(byte)0);*/
1521 for(int i=off;i<off+length;i++) a[i] = 0;
1524 public int write(byte[] a, int off, int length) { return length; }
1525 public int seek(int n, int whence) { return 0; }
1526 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1527 public int flags() { return O_RDWR; }
1529 private FD devNullFD = new FD() {
1530 public int read(byte[] a, int off, int length) { return 0; }
1531 public int write(byte[] a, int off, int length) { return length; }
1532 public int seek(int n, int whence) { return 0; }
1533 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1534 public int flags() { return O_RDWR; }
1537 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1538 if(path.equals("null")) return devNullFD;
1539 if(path.equals("zero")) return devZeroFD;
1540 if(path.startsWith("fd/")) {
1543 n = Integer.parseInt(path.substring(4));
1544 } catch(NumberFormatException e) {
1547 if(n < 0 || n >= OPEN_MAX) return null;
1548 if(r.fds[n] == null) return null;
1549 return r.fds[n].dup();
1551 if(path.equals("fd")) {
1553 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1554 final int[] files = new int[count];
1556 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1557 return new DevDirFD() {
1558 public int myInode() { return FD_INODE; }
1559 public int parentInode() { return ROOT_INODE; }
1560 public int inode(int n) { return FD_INODES + n; }
1561 public String name(int n) { return Integer.toString(files[n]); }
1562 public int size() { return files.length; }
1565 if(path.equals("")) {
1566 return new DevDirFD() {
1567 public int myInode() { return ROOT_INODE; }
1568 // HACK: We don't have any clean way to get the parent inode
1569 public int parentInode() { return ROOT_INODE; }
1570 public int inode(int n) {
1572 case 0: return NULL_INODE;
1573 case 1: return ZERO_INODE;
1574 case 2: return FD_INODE;
1579 public String name(int n) {
1581 case 0: return "null";
1582 case 1: return "zero";
1583 case 2: return "fd";
1584 default: return null;
1587 public int size() { return 3; }
1593 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1594 if(path.equals("null")) return devNullFD.fstat();
1595 if(path.equals("zero")) return devZeroFD.fstat();
1596 if(path.startsWith("fd/")) {
1599 n = Integer.parseInt(path.substring(3));
1600 } catch(NumberFormatException e) {
1603 if(n < 0 || n >= OPEN_MAX) return null;
1604 if(r.fds[n] == null) return null;
1605 return r.fds[n].fstat();
1607 if(path.equals("fd")) return new FStat() { public int inode() { return FD_INODE; } public int dev() { return devno; } public int type() { return S_IFDIR; } public int mode() { return 0444; }};
1608 if(path.equals("")) return new FStat() { public int inode() { return ROOT_INODE; } public int dev() { return devno; } public int type() { return S_IFDIR; } public int mode() { return 0444; }};
1612 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1613 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }