1 // Copyright 2000-2005 the Contributors, as shown in the revision logs.
2 // Licensed under the Apache Public Source License 2.0 ("the License").
3 // You may not use this file except in compliance with the License.
5 package org.ibex.nestedvm;
7 import org.ibex.nestedvm.util.*;
8 // HACK: This is ugly, this stuff needs to be in org.ibex.util or something
9 import org.ibex.classgen.util.Sort;
13 import java.lang.reflect.*; // For lazily linked RuntimeCompiler
17 public abstract class UnixRuntime extends Runtime implements Cloneable {
18 /** The pid of this "process" */
20 private UnixRuntime parent;
21 public final int getPid() { return pid; }
23 private static final GlobalState defaultGS = new GlobalState();
24 private GlobalState gs;
25 public void setGlobalState(GlobalState gs) {
26 if(state != STOPPED) throw new IllegalStateException("can't change GlobalState when running");
27 if(gs == null) throw new NullPointerException("gs is null");
31 /** proceses' current working directory - absolute path WITHOUT leading slash
32 "" = root, "bin" = /bin "usr/bin" = /usr/bin */
35 /** The runtime that should be run next when in state == EXECED */
36 private UnixRuntime execedRuntime;
38 private Object children; // used only for synchronizatin
39 private Vector activeChildren;
40 private Vector exitedChildren;
42 protected UnixRuntime(int pageSize, int totalPages) { this(pageSize,totalPages,false); }
43 protected UnixRuntime(int pageSize, int totalPages, boolean exec) {
44 super(pageSize,totalPages,exec);
48 String userdir = Platform.getProperty("user.dir");
49 String nvroot = Platform.getProperty("nestedvm.root");
51 if(userdir != null && nvroot == null) {
52 if(userdir.startsWith("/") && File.separatorChar == '/') {
53 cwd = userdir.substring(1);
55 Vector vec = new Vector();
56 File root = HostFS.hostRootDir();
57 String s = new File(userdir).getAbsolutePath();
59 System.err.println(s);
60 System.err.println(d);
61 while(!d.equals(root)) {
62 System.err.println("Got " + d.getName());
63 vec.addElement(d.getName());
64 if((s = d.getParent()) == null) break;
68 for(int i=vec.size()-1;i>=0;i--) cwd += (String) vec.elementAt(i) + (i==0?"":"/");
74 private static String posixTZ() {
75 StringBuffer sb = new StringBuffer();
76 TimeZone zone = TimeZone.getDefault();
77 int off = zone.getRawOffset() / 1000;
78 sb.append(Platform.timeZoneGetDisplayName(zone,false,false));
79 if(off > 0) sb.append("-");
81 sb.append(off/3600); off = off%3600;
82 if(off > 0) sb.append(":").append(off/60); off=off%60;
83 if(off > 0) sb.append(":").append(off);
84 if(zone.useDaylightTime())
85 sb.append(Platform.timeZoneGetDisplayName(zone,true,false));
89 private static boolean envHas(String key,String[] environ) {
90 for(int i=0;i<environ.length;i++)
91 if(environ[i]!=null && environ[i].startsWith(key + "=")) return true;
95 String[] createEnv(String[] extra) {
96 String[] defaults = new String[6];
98 if(extra == null) extra = new String[0];
99 if(!envHas("USER",extra) && Platform.getProperty("user.name") != null)
100 defaults[n++] = "USER=" + Platform.getProperty("user.name");
101 if(!envHas("HOME",extra) && Platform.getProperty("user.home") != null)
102 defaults[n++] = "HOME=" + Platform.getProperty("user.home");
103 if(!envHas("SHELL",extra)) defaults[n++] = "SHELL=/bin/sh";
104 if(!envHas("TERM",extra) && !win32Hacks) defaults[n++] = "TERM=vt100";
105 if(!envHas("TZ",extra)) defaults[n++] = "TZ=" + posixTZ();
106 if(!envHas("PATH",extra)) defaults[n++] = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin";
107 String[] env = new String[extra.length+n];
108 for(int i=0;i<n;i++) env[i] = defaults[i];
109 for(int i=0;i<extra.length;i++) env[n++] = extra[i];
113 private static class ProcessTableFullExn extends RuntimeException { }
116 UnixRuntime[] tasks = gs.tasks;
119 UnixRuntime prev = tasks[pid];
120 if(prev == null || prev == this || prev.pid != pid || prev.parent != parent)
121 throw new Error("should never happen");
122 synchronized(parent.children) {
123 int i = parent.activeChildren.indexOf(prev);
124 if(i == -1) throw new Error("should never happen");
125 parent.activeChildren.setElementAt(this,i);
129 int nextPID = gs.nextPID;
130 for(int i=nextPID;i<tasks.length;i++) if(tasks[i] == null) { newpid = i; break; }
131 if(newpid == -1) for(int i=1;i<nextPID;i++) if(tasks[i] == null) { newpid = i; break; }
132 if(newpid == -1) throw new ProcessTableFullExn();
134 gs.nextPID = newpid + 1;
140 int _syscall(int syscall, int a, int b, int c, int d, int e, int f) throws ErrnoException, FaultException {
142 case SYS_kill: return sys_kill(a,b);
143 case SYS_fork: return sys_fork();
144 case SYS_pipe: return sys_pipe(a);
145 case SYS_dup2: return sys_dup2(a,b);
146 case SYS_dup: return sys_dup(a);
147 case SYS_waitpid: return sys_waitpid(a,b,c);
148 case SYS_stat: return sys_stat(a,b);
149 case SYS_lstat: return sys_lstat(a,b);
150 case SYS_mkdir: return sys_mkdir(a,b);
151 case SYS_getcwd: return sys_getcwd(a,b);
152 case SYS_chdir: return sys_chdir(a);
153 case SYS_exec: return sys_exec(a,b,c);
154 case SYS_getdents: return sys_getdents(a,b,c,d);
155 case SYS_unlink: return sys_unlink(a);
156 case SYS_getppid: return sys_getppid();
157 case SYS_socket: return sys_socket(a,b,c);
158 case SYS_connect: return sys_connect(a,b,c);
159 case SYS_resolve_hostname: return sys_resolve_hostname(a,b,c);
160 case SYS_setsockopt: return sys_setsockopt(a,b,c,d,e);
161 case SYS_getsockopt: return sys_getsockopt(a,b,c,d,e);
162 case SYS_bind: return sys_bind(a,b,c);
163 case SYS_listen: return sys_listen(a,b);
164 case SYS_accept: return sys_accept(a,b,c);
165 case SYS_shutdown: return sys_shutdown(a,b);
166 case SYS_sysctl: return sys_sysctl(a,b,c,d,e,f);
167 case SYS_sendto: return sys_sendto(a,b,c,d,e,f);
168 case SYS_recvfrom: return sys_recvfrom(a,b,c,d,e,f);
169 case SYS_select: return sys_select(a,b,c,d,e);
170 case SYS_access: return sys_access(a,b);
171 case SYS_realpath: return sys_realpath(a,b);
172 case SYS_chown: return sys_chown(a,b,c);
173 case SYS_lchown: return sys_chown(a,b,c);
174 case SYS_fchown: return sys_fchown(a,b,c);
175 case SYS_chmod: return sys_chmod(a,b,c);
176 case SYS_fchmod: return sys_fchmod(a,b,c);
178 default: return super._syscall(syscall,a,b,c,d,e,f);
182 FD _open(String path, int flags, int mode) throws ErrnoException {
183 return gs.open(this,normalizePath(path),flags,mode);
186 private int sys_getppid() {
187 return parent == null ? 1 : parent.pid;
190 private int sys_chown(int fileAddr, int uid, int gid) {
193 private int sys_lchown(int fileAddr, int uid, int gid) {
196 private int sys_fchown(int fd, int uid, int gid) {
199 private int sys_chmod(int fileAddr, int uid, int gid) {
202 private int sys_fchmod(int fd, int uid, int gid) {
207 private int sys_access(int cstring, int mode) throws ErrnoException, ReadFaultException {
208 // FEATURE: sys_access
209 return gs.stat(this,cstring(cstring)) == null ? -ENOENT : 0;
212 private int sys_realpath(int inAddr, int outAddr) throws FaultException {
213 String s = normalizePath(cstring(inAddr));
214 byte[] b = getNullTerminatedBytes(s);
215 if(b.length > PATH_MAX) return -ERANGE;
216 copyout(b,outAddr,b.length);
220 // FEATURE: Signal handling
221 // check flag only on backwards jumps to basic blocks without compulsatory checks
222 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
224 /** The kill syscall.
225 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
226 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
227 Anything else terminates the process. */
228 private int sys_kill(int pid, int signal) {
229 // This will only be called by raise() in newlib to invoke the default handler
230 // We don't have to worry about actually delivering the signal
231 if(pid != pid) return -ESRCH;
232 if(signal < 0 || signal >= 32) return -EINVAL;
245 exit(128+signal, true);
250 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
251 final int WNOHANG = 1;
252 if((options & ~(WNOHANG)) != 0) return -EINVAL;
253 if(pid == 0 || pid < -1) {
254 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
257 boolean blocking = (options&WNOHANG)==0;
259 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
260 if(children == null) return blocking ? -ECHILD : 0;
262 UnixRuntime done = null;
264 synchronized(children) {
267 if(exitedChildren.size() > 0) {
268 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
269 exitedChildren.removeElementAt(exitedChildren.size() - 1);
272 if(pid >= gs.tasks.length) return -ECHILD;
273 UnixRuntime t = gs.tasks[pid];
274 if(t.parent != this) return -ECHILD;
275 if(t.state == EXITED) {
276 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
280 // process group stuff, EINVAL returned above
281 throw new Error("should never happen");
284 if(!blocking) return 0;
285 try { children.wait(); } catch(InterruptedException e) {}
286 //System.err.println("waitpid woke up: " + exitedChildren.size());
288 gs.tasks[done.pid] = null;
293 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
299 if(children != null) synchronized(children) {
300 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
301 UnixRuntime child = (UnixRuntime) e.nextElement();
302 gs.tasks[child.pid] = null;
304 exitedChildren.removeAllElements();
305 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
306 UnixRuntime child = (UnixRuntime) e.nextElement();
309 activeChildren.removeAllElements();
312 UnixRuntime _parent = parent;
313 if(_parent == null) {
314 gs.tasks[pid] = null;
316 synchronized(_parent.children) {
318 gs.tasks[pid] = null;
320 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
321 parent.exitedChildren.addElement(this);
322 parent.children.notify();
328 protected Object clone() throws CloneNotSupportedException {
329 UnixRuntime r = (UnixRuntime) super.clone();
333 r.activeChildren = r.exitedChildren = null;
337 private int sys_fork() {
341 r = (UnixRuntime) clone();
342 } catch(Exception e) {
351 } catch(ProcessTableFullExn e) {
355 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
356 if(children == null) {
357 children = new Object();
358 activeChildren = new Vector();
359 exitedChildren = new Vector();
361 activeChildren.addElement(r);
363 CPUState state = new CPUState();
365 state.r[V0] = 0; // return 0 to child
366 state.pc += 4; // skip over syscall instruction
367 r.setCPUState(state);
370 new ForkedProcess(r);
375 public static final class ForkedProcess extends Thread {
376 private final UnixRuntime initial;
377 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
378 public void run() { UnixRuntime.executeAndExec(initial); }
381 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
382 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
384 public static int executeAndExec(UnixRuntime r) {
387 if(r.execute()) break;
388 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
390 if(r.state != EXECED) return r.exitStatus();
395 private String[] readStringArray(int addr) throws ReadFaultException {
397 for(int p=addr;memRead(p) != 0;p+=4) count++;
398 String[] a = new String[count];
399 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
403 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
404 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
407 private final static Method runtimeCompilerCompile;
411 m = Class.forName("org.ibex.nestedvm.RuntimeCompiler").getMethod("compile",new Class[]{Seekable.class,String.class,String.class});
412 } catch(NoSuchMethodException e) {
414 } catch(ClassNotFoundException e) {
417 runtimeCompilerCompile = m;
420 public Class runtimeCompile(Seekable s, String sourceName) throws IOException {
421 if(runtimeCompilerCompile == null) {
422 if(STDERR_DIAG) System.err.println("WARNING: Exec attempted but RuntimeCompiler not found!");
427 return (Class) runtimeCompilerCompile.invoke(null,new Object[]{s,"unixruntime,maxinsnpermethod=256,lessconstants",sourceName});
428 } catch(IllegalAccessException e) {
431 } catch(InvocationTargetException e) {
432 Throwable t = e.getTargetException();
433 if(t instanceof IOException) throw (IOException) t;
434 if(t instanceof RuntimeException) throw (RuntimeException) t;
435 if(t instanceof Error) throw (Error) t;
436 if(STDERR_DIAG) t.printStackTrace();
441 private int exec(String path, String[] argv, String[] envp) throws ErrnoException {
442 if(argv.length == 0) argv = new String[]{""};
443 // HACK: Hideous hack to make a standalone busybox possible
444 if(path.equals("bin/busybox") && getClass().getName().endsWith("BusyBox"))
445 return execClass(getClass(),argv,envp);
447 // NOTE: For this little hack to work nestedvm.root MUST be "."
449 System.err.println("Execing normalized path: " + normalizedPath);
450 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
451 } catch(IOException e) { throw new Error(e); }*/
453 FStat fstat = gs.stat(this,path);
454 if(fstat == null) return -ENOENT;
455 GlobalState.CacheEnt ent = (GlobalState.CacheEnt) gs.execCache.get(path);
456 long mtime = fstat.mtime();
457 long size = fstat.size();
459 //System.err.println("Found cached entry for " + path);
460 if(ent.time ==mtime && ent.size == size) {
461 if(ent.o instanceof Class)
462 return execClass((Class) ent.o,argv,envp);
463 if(ent.o instanceof String[])
464 return execScript(path,(String[]) ent.o,argv,envp);
465 throw new Error("should never happen");
467 //System.err.println("Cache was out of date");
468 gs.execCache.remove(path);
471 FD fd = gs.open(this,path,RD_ONLY,0);
472 if(fd == null) throw new ErrnoException(ENOENT);
473 Seekable s = fd.seekable();
474 if(s == null) throw new ErrnoException(EACCES);
476 byte[] buf = new byte[4096];
479 int n = s.read(buf,0,buf.length);
480 if(n == -1) throw new ErrnoException(ENOEXEC);
483 case '\177': // possible ELF
484 if(n < 4) s.tryReadFully(buf,n,4-n);
485 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') return -ENOEXEC;
487 if(STDERR_DIAG) System.err.println("Running RuntimeCompiler for " + path);
488 Class c = runtimeCompile(s,path);
489 if(STDERR_DIAG) System.err.println("RuntimeCompiler finished for " + path);
490 if(c == null) throw new ErrnoException(ENOEXEC);
491 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
492 return execClass(c,argv,envp);
495 int n2 = s.read(buf,1,buf.length-1);
496 if(n2 == -1) return -ENOEXEC;
499 if(buf[1] != '!') return -ENOEXEC;
503 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
505 if(p == buf.length) break OUTER;
506 n = s.read(buf,p,buf.length-p);
509 for(arg=2;arg<p;arg++) if(buf[arg] == ' ') break;
511 while(arg < p && buf[arg] == ' ') arg++;
512 String[] command = new String[] {
513 new String(buf,2,cmdEnd),
514 arg < p ? new String(buf,arg,p-arg) : null
516 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
517 return execScript(path,command,argv,envp);
521 } catch(IOException e) {
528 public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
529 String[] newArgv = new String[argv.length + command[1] != null ? 2 : 1];
530 int p = command[0].lastIndexOf('/');
531 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
533 if(command[1] != null) newArgv[p++] = command[1];
534 newArgv[p++] = "/" + path;
535 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
536 return exec(command[0],newArgv,envp);
539 public int execClass(Class c,String[] argv, String[] envp) {
541 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
542 return exec(r,argv,envp);
543 } catch(Exception e) {
549 private int exec(UnixRuntime r, String[] argv, String[] envp) {
550 //System.err.println("Execing " + r);
551 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
553 r.closeOnExec = closeOnExec;
554 // make sure this doesn't get messed with these since we didn't copy them
572 private final byte[] pipebuf = new byte[PIPE_BUF*4];
574 private int writePos;
576 public final FD reader = new Reader();
577 public final FD writer = new Writer();
579 public class Reader extends FD {
580 protected FStat _fstat() { return new SocketFStat(); }
581 public int read(byte[] buf, int off, int len) throws ErrnoException {
582 if(len == 0) return 0;
583 synchronized(Pipe.this) {
584 while(writePos != -1 && readPos == writePos) {
585 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
587 if(writePos == -1) return 0; // eof
588 len = Math.min(len,writePos-readPos);
589 System.arraycopy(pipebuf,readPos,buf,off,len);
591 if(readPos == writePos) Pipe.this.notify();
595 public int flags() { return O_RDONLY; }
596 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
599 public class Writer extends FD {
600 protected FStat _fstat() { return new SocketFStat(); }
601 public int write(byte[] buf, int off, int len) throws ErrnoException {
602 if(len == 0) return 0;
603 synchronized(Pipe.this) {
604 if(readPos == -1) throw new ErrnoException(EPIPE);
605 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
606 // not enough space to atomicly write the data
607 while(readPos != -1 && readPos != writePos) {
608 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
610 if(readPos == -1) throw new ErrnoException(EPIPE);
611 readPos = writePos = 0;
613 len = Math.min(len,pipebuf.length - writePos);
614 System.arraycopy(buf,off,pipebuf,writePos,len);
615 if(readPos == writePos) Pipe.this.notify();
620 public int flags() { return O_WRONLY; }
621 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
625 private int sys_pipe(int addr) {
626 Pipe pipe = new Pipe();
628 int fd1 = addFD(pipe.reader);
629 if(fd1 < 0) return -ENFILE;
630 int fd2 = addFD(pipe.writer);
631 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
635 memWrite(addr+4,fd2);
636 } catch(FaultException e) {
644 private int sys_dup2(int oldd, int newd) {
645 if(oldd == newd) return 0;
646 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
647 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
648 if(fds[oldd] == null) return -EBADFD;
649 if(fds[newd] != null) fds[newd].close();
650 fds[newd] = fds[oldd].dup();
654 private int sys_dup(int oldd) {
655 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
656 if(fds[oldd] == null) return -EBADFD;
657 FD fd = fds[oldd].dup();
658 int newd = addFD(fd);
659 if(newd < 0) { fd.close(); return -ENFILE; }
663 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
664 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
665 if(s == null) return -ENOENT;
669 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
670 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
671 if(s == null) return -ENOENT;
675 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
676 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
680 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
681 gs.unlink(this,normalizePath(cstring(cstring)));
685 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
686 byte[] b = getBytes(cwd);
687 if(size == 0) return -EINVAL;
688 if(size < b.length+2) return -ERANGE;
690 copyout(b,addr+1,b.length);
691 memset(addr+b.length+1,0,1);
695 private int sys_chdir(int addr) throws ErrnoException, FaultException {
696 String path = normalizePath(cstring(addr));
697 FStat st = gs.stat(this,path);
698 if(st == null) return -ENOENT;
699 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
704 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
705 count = Math.min(count,MAX_CHUNK);
706 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
707 if(fds[fdn] == null) return -EBADFD;
708 byte[] buf = byteBuf(count);
709 int n = fds[fdn].getdents(buf,0,count);
714 static class SocketFD extends FD {
715 public static final int TYPE_STREAM = 0;
716 public static final int TYPE_DGRAM = 1;
717 public static final int LISTEN = 2;
718 public int type() { return flags & 1; }
719 public boolean listen() { return (flags & 2) != 0; }
728 InetAddress bindAddr;
730 InetAddress connectAddr;
731 int connectPort = -1;
737 private static final byte[] EMPTY = new byte[0];
738 public SocketFD(int type) {
740 if(type == TYPE_DGRAM)
741 dp = new DatagramPacket(EMPTY,0);
744 public void setOptions() {
746 if(s != null && type() == TYPE_STREAM && !listen()) {
747 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
749 } catch(SocketException e) {
750 if(STDERR_DIAG) e.printStackTrace();
754 public void _close() {
756 if(s != null) s.close();
757 if(ss != null) ss.close();
758 if(ds != null) ds.close();
759 } catch(IOException e) {
764 public int read(byte[] a, int off, int length) throws ErrnoException {
765 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
766 if(is == null) throw new ErrnoException(EPIPE);
768 int n = is.read(a,off,length);
769 return n < 0 ? 0 : n;
770 } catch(IOException e) {
771 throw new ErrnoException(EIO);
775 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
776 if(type() == TYPE_STREAM) return read(a,off,length);
778 if(off != 0) throw new IllegalArgumentException("off must be 0");
780 dp.setLength(length);
782 if(ds == null) ds = new DatagramSocket();
784 } catch(IOException e) {
785 if(STDERR_DIAG) e.printStackTrace();
786 throw new ErrnoException(EIO);
788 if(sockAddr != null) {
789 sockAddr[0] = dp.getAddress();
790 port[0] = dp.getPort();
792 return dp.getLength();
795 public int write(byte[] a, int off, int length) throws ErrnoException {
796 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
798 if(os == null) throw new ErrnoException(EPIPE);
800 os.write(a,off,length);
802 } catch(IOException e) {
803 throw new ErrnoException(EIO);
807 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
808 if(off != 0) throw new IllegalArgumentException("off must be 0");
809 if(type() == TYPE_STREAM) return write(a,off,length);
811 if(destAddr == null) {
812 destAddr = connectAddr;
813 destPort = connectPort;
815 if(destAddr == null) throw new ErrnoException(ENOTCONN);
818 dp.setAddress(destAddr);
819 dp.setPort(destPort);
821 dp.setLength(length);
824 if(ds == null) ds = new DatagramSocket();
826 } catch(IOException e) {
827 if(STDERR_DIAG) e.printStackTrace();
828 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
829 throw new ErrnoException(EIO);
831 return dp.getLength();
834 public int flags() { return O_RDWR; }
835 public FStat _fstat() { return new SocketFStat(); }
838 private int sys_socket(int domain, int type, int proto) {
839 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
840 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
843 private SocketFD getSocketFD(int fdn) throws ErrnoException {
844 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
845 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
846 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
848 return (SocketFD) fds[fdn];
851 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
852 SocketFD fd = getSocketFD(fdn);
854 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
855 int word1 = memRead(addr);
856 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
857 int port = word1 & 0xffff;
858 byte[] ip = new byte[4];
861 InetAddress inetAddr;
863 inetAddr = Platform.inetAddressFromBytes(ip);
864 } catch(UnknownHostException e) {
865 return -EADDRNOTAVAIL;
868 fd.connectAddr = inetAddr;
869 fd.connectPort = port;
873 case SocketFD.TYPE_STREAM: {
874 Socket s = new Socket(inetAddr,port);
877 fd.is = s.getInputStream();
878 fd.os = s.getOutputStream();
881 case SocketFD.TYPE_DGRAM:
884 throw new Error("should never happen");
886 } catch(IOException e) {
887 return -ECONNREFUSED;
893 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
894 String hostname = cstring(chostname);
895 int size = memRead(sizeAddr);
896 InetAddress[] inetAddrs;
898 inetAddrs = InetAddress.getAllByName(hostname);
899 } catch(UnknownHostException e) {
900 return HOST_NOT_FOUND;
902 int count = min(size/4,inetAddrs.length);
903 for(int i=0;i<count;i++,addr+=4) {
904 byte[] b = inetAddrs[i].getAddress();
907 memWrite(sizeAddr,count*4);
911 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
912 SocketFD fd = getSocketFD(fdn);
918 if(len != 4) return -EINVAL;
919 int val = memRead(valaddr);
920 if(val != 0) fd.options |= name;
921 else fd.options &= ~name;
926 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
930 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
935 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
936 SocketFD fd = getSocketFD(fdn);
942 int len = memRead(lenaddr);
943 if(len < 4) return -EINVAL;
944 int val = (fd.options & name) != 0 ? 1 : 0;
945 memWrite(valaddr,val);
950 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
954 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
959 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
960 SocketFD fd = getSocketFD(fdn);
962 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
963 int word1 = memRead(addr);
964 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
965 int port = word1 & 0xffff;
966 InetAddress inetAddr = null;
967 if(memRead(addr+4) != 0) {
968 byte[] ip = new byte[4];
972 inetAddr = Platform.inetAddressFromBytes(ip);
973 } catch(UnknownHostException e) {
974 return -EADDRNOTAVAIL;
979 case SocketFD.TYPE_STREAM: {
980 fd.bindAddr = inetAddr;
984 case SocketFD.TYPE_DGRAM: {
985 if(fd.ds != null) fd.ds.close();
987 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
988 } catch(IOException e) {
994 throw new Error("should never happen");
998 private int sys_listen(int fdn, int backlog) throws ErrnoException {
999 SocketFD fd = getSocketFD(fdn);
1000 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1001 if(fd.ss != null || fd.s != null) return -EISCONN;
1002 if(fd.bindPort < 0) return -EOPNOTSUPP;
1005 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
1006 fd.flags |= SocketFD.LISTEN;
1008 } catch(IOException e) {
1014 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
1015 SocketFD fd = getSocketFD(fdn);
1016 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1017 if(!fd.listen()) return -EOPNOTSUPP;
1019 int size = memRead(lenaddr);
1021 ServerSocket s = fd.ss;
1024 client = s.accept();
1025 } catch(IOException e) {
1030 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
1031 byte[] b = client.getInetAddress().getAddress();
1032 copyout(b,addr+4,4);
1033 memWrite(lenaddr,8);
1036 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
1037 clientFD.s = client;
1039 clientFD.is = client.getInputStream();
1040 clientFD.os = client.getOutputStream();
1041 } catch(IOException e) {
1044 int n = addFD(clientFD);
1045 if(n == -1) { clientFD.close(); return -ENFILE; }
1049 private int sys_shutdown(int fdn, int how) throws ErrnoException {
1050 SocketFD fd = getSocketFD(fdn);
1051 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
1052 if(fd.s == null) return -ENOTCONN;
1057 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
1058 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
1059 } catch(IOException e) {
1066 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
1067 SocketFD fd = getSocketFD(fdn);
1068 if(flags != 0) throw new ErrnoException(EINVAL);
1070 int word1 = memRead(destAddr);
1071 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1072 int port = word1 & 0xffff;
1073 InetAddress inetAddr;
1074 byte[] ip = new byte[4];
1075 copyin(destAddr+4,ip,4);
1077 inetAddr = Platform.inetAddressFromBytes(ip);
1078 } catch(UnknownHostException e) {
1079 return -EADDRNOTAVAIL;
1082 count = Math.min(count,MAX_CHUNK);
1083 byte[] buf = byteBuf(count);
1084 copyin(addr,buf,count);
1086 return fd.sendto(buf,0,count,inetAddr,port);
1087 } catch(ErrnoException e) {
1088 if(e.errno == EPIPE) exit(128+13,true);
1093 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
1094 SocketFD fd = getSocketFD(fdn);
1095 if(flags != 0) throw new ErrnoException(EINVAL);
1097 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
1098 int[] port = sourceAddr == 0 ? null : new int[1];
1100 count = Math.min(count,MAX_CHUNK);
1101 byte[] buf = byteBuf(count);
1102 int n = fd.recvfrom(buf,0,count,inetAddr,port);
1103 copyout(buf,addr,n);
1105 if(sourceAddr != 0) {
1106 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
1107 byte[] ip = inetAddr[0].getAddress();
1108 copyout(ip,sourceAddr+4,4);
1114 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
1118 private static String hostName() {
1120 return InetAddress.getLocalHost().getHostName();
1121 } catch(UnknownHostException e) {
1126 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
1127 if(newp != 0) return -EPERM;
1128 if(namelen == 0) return -ENOENT;
1129 if(oldp == 0) return 0;
1132 switch(memRead(nameaddr)) {
1134 if(namelen != 2) break;
1135 switch(memRead(nameaddr+4)) {
1136 case KERN_OSTYPE: o = "NestedVM"; break;
1137 case KERN_HOSTNAME: o = hostName(); break;
1138 case KERN_OSRELEASE: o = VERSION; break;
1139 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
1143 if(namelen != 2) break;
1144 switch(memRead(nameaddr+4)) {
1145 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
1149 if(o == null) return -ENOENT;
1150 int len = memRead(oldlenaddr);
1151 if(o instanceof String) {
1152 byte[] b = getNullTerminatedBytes((String)o);
1153 if(len < b.length) return -ENOMEM;
1155 copyout(b,oldp,len);
1156 memWrite(oldlenaddr,len);
1157 } else if(o instanceof Integer) {
1158 if(len < 4) return -ENOMEM;
1159 memWrite(oldp,((Integer)o).intValue());
1161 throw new Error("should never happen");
1166 public static final class GlobalState {
1167 Hashtable execCache = new Hashtable();
1169 final UnixRuntime[] tasks;
1172 private MP[] mps = new MP[0];
1175 public GlobalState() { this(255); }
1176 public GlobalState(int maxProcs) { this(maxProcs,true); }
1177 public GlobalState(int maxProcs, boolean defaultMounts) {
1178 tasks = new UnixRuntime[maxProcs+1];
1180 addMount("/",new HostFS());
1181 addMount("/dev",new DevFS());
1185 static class MP implements Sort.Comparable {
1186 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1189 public int compareTo(Object o) {
1190 if(!(o instanceof MP)) return 1;
1191 return -path.compareTo(((MP)o).path);
1195 public synchronized FS getMount(String path) {
1196 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1197 if(path.equals("/")) return root;
1198 path = path.substring(1);
1199 for(int i=0;i<mps.length;i++)
1200 if(mps[i].path.equals(path)) return mps[i].fs;
1204 public synchronized void addMount(String path, FS fs) {
1205 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1206 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1208 if(fs.owner != null) fs.owner.removeMount(fs);
1211 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1212 path = path.substring(1);
1213 int oldLength = mps.length;
1214 MP[] newMPS = new MP[oldLength + 1];
1215 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1216 newMPS[oldLength] = new MP(path,fs);
1220 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1221 fs.devno = highdevno + 2;
1224 public synchronized void removeMount(FS fs) {
1225 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1226 throw new IllegalArgumentException("mount point doesn't exist");
1229 public synchronized void removeMount(String path) {
1230 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1231 if(path.equals("/")) {
1234 path = path.substring(1);
1236 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1237 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1242 private void removeMount(int index) {
1243 if(index == -1) { root.owner = null; root = null; return; }
1244 MP[] newMPS = new MP[mps.length - 1];
1245 System.arraycopy(mps,0,newMPS,0,index);
1246 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1250 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1251 int pl = normalizedPath.length();
1254 synchronized(this) { list = mps; }
1255 for(int i=0;i<list.length;i++) {
1257 int mpl = mp.path.length();
1258 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1259 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1262 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1265 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1266 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1267 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1268 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1269 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1271 private static class CacheEnt {
1272 public final long time;
1273 public final long size;
1274 public final Object o;
1275 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1279 public abstract static class FS {
1280 static final int OPEN = 1;
1281 static final int STAT = 2;
1282 static final int LSTAT = 3;
1283 static final int MKDIR = 4;
1284 static final int UNLINK = 5;
1289 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1291 case OPEN: return open(r,path,arg1,arg2);
1292 case STAT: return stat(r,path);
1293 case LSTAT: return lstat(r,path);
1294 case MKDIR: mkdir(r,path,arg1); return null;
1295 case UNLINK: unlink(r,path); return null;
1296 default: throw new Error("should never happen");
1300 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1302 // If this returns null it'll be truned into an ENOENT
1303 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1304 // If this returns null it'll be turned into an ENOENT
1305 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1306 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1307 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1310 // chroot support should go in here if it is ever implemented chroot support in here
1311 private String normalizePath(String path) {
1312 boolean absolute = path.startsWith("/");
1313 int cwdl = cwd.length();
1315 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1316 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1317 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1319 char[] in = new char[path.length()+1];
1320 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1324 do { inp++; } while(in[inp] == '/');
1325 } else if(cwdl != 0) {
1326 cwd.getChars(0,cwdl,out,0);
1330 path.getChars(0,path.length(),in,0);
1331 while(in[inp] != 0) {
1333 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1334 if(in[inp] == '\0') break;
1335 while(in[inp] == '/') inp++;
1339 if(in[inp] == '\0') break;
1340 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1342 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1343 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1344 // Just read a /..{$,/}
1346 if(outp > 0) outp--;
1347 while(outp > 0 && out[outp] != '/') outp--;
1348 //System.err.println("After ..: " + new String(out,0,outp));
1351 // Just read a /.[^.] or /..[^/$]
1356 if(outp > 0 && out[outp-1] == '/') outp--;
1357 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1358 return new String(out,0,outp);
1361 FStat hostFStat(final File f, Object data) {
1364 FileInputStream fis = new FileInputStream(f);
1365 switch(fis.read()) {
1366 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1367 case '#': e = fis.read() == '!';
1370 } catch(IOException e2) { }
1371 HostFS fs = (HostFS) data;
1372 final int inode = fs.inodes.get(f.getAbsolutePath());
1373 final int devno = fs.devno;
1374 return new HostFStat(f,e) {
1375 public int inode() { return inode; }
1376 public int dev() { return devno; }
1380 FD hostFSDirFD(File f, Object _fs) {
1381 HostFS fs = (HostFS) _fs;
1382 return fs.new HostDirFD(f);
1385 public static class HostFS extends FS {
1386 InodeCache inodes = new InodeCache(4000);
1387 protected File root;
1388 public File getRoot() { return root; }
1390 static File hostRootDir() {
1391 if(Platform.getProperty("nestedvm.root") != null) {
1392 File f = new File(Platform.getProperty("nestedvm.root"));
1393 if(f.isDirectory()) return f;
1394 // fall through to case below
1396 String cwd = Platform.getProperty("user.dir");
1397 File f = new File(cwd != null ? cwd : ".");
1398 if(!f.exists()) throw new Error("Couldn't get File for cwd");
1399 f = new File(f.getAbsolutePath());
1400 while(f.getParent() != null) f = new File(f.getParent());
1401 // This works around a bug in some versions of ClassPath
1402 if(f.getPath().length() == 0) f = new File("/");
1406 private File hostFile(String path) {
1407 char sep = File.separatorChar;
1409 char buf[] = path.toCharArray();
1410 for(int i=0;i<buf.length;i++) {
1412 if(c == '/') buf[i] = sep;
1413 else if(c == sep) buf[i] = '/';
1415 path = new String(buf);
1417 return new File(root,path);
1420 public HostFS() { this(hostRootDir()); }
1421 public HostFS(String root) { this(new File(root)); }
1422 public HostFS(File root) { this.root = root; }
1425 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1426 final File f = hostFile(path);
1427 return r.hostFSOpen(f,flags,mode,this);
1430 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1431 File f = hostFile(path);
1432 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1433 if(!f.exists()) throw new ErrnoException(ENOENT);
1434 if(!f.delete()) throw new ErrnoException(EPERM);
1437 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1438 File f = hostFile(path);
1439 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1440 if(!f.exists()) return null;
1441 return r.hostFStat(f,this);
1444 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1445 File f = hostFile(path);
1446 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1447 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1448 if(f.exists()) throw new ErrnoException(ENOTDIR);
1449 File parent = getParentFile(f);
1450 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1451 if(!f.mkdir()) throw new ErrnoException(EIO);
1454 private static File getParentFile(File f) {
1455 String p = f.getParent();
1456 return p == null ? null : new File(p);
1459 public class HostDirFD extends DirFD {
1460 private final File f;
1461 private final File[] children;
1462 public HostDirFD(File f) {
1464 String[] l = f.list();
1465 children = new File[l.length];
1466 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1468 public int size() { return children.length; }
1469 public String name(int n) { return children[n].getName(); }
1470 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1471 public int parentInode() {
1472 File parent = getParentFile(f);
1473 // HACK: myInode() isn't really correct if we're not the root
1474 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1476 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1477 public int myDev() { return devno; }
1481 private static void putInt(byte[] buf, int off, int n) {
1482 buf[off+0] = (byte)((n>>>24)&0xff);
1483 buf[off+1] = (byte)((n>>>16)&0xff);
1484 buf[off+2] = (byte)((n>>> 8)&0xff);
1485 buf[off+3] = (byte)((n>>> 0)&0xff);
1488 public static abstract class DirFD extends FD {
1489 private int pos = -2;
1491 protected abstract int size();
1492 protected abstract String name(int n);
1493 protected abstract int inode(int n);
1494 protected abstract int myDev();
1495 protected abstract int parentInode();
1496 protected abstract int myInode();
1497 public int flags() { return O_RDONLY; }
1499 public int getdents(byte[] buf, int off, int len) {
1503 OUTER: for(;len > 0 && pos < size();pos++){
1507 ino = pos == -1 ? parentInode() : myInode();
1508 if(ino == -1) continue;
1509 reclen = 9 + (pos == -1 ? 2 : 1);
1510 if(reclen > len) break OUTER;
1512 if(pos == -1) buf[off+9] = '.';
1515 String f = name(pos);
1516 byte[] fb = getBytes(f);
1517 reclen = fb.length + 9;
1518 if(reclen > len) break OUTER;
1520 System.arraycopy(fb,0,buf,off+8,fb.length);
1523 buf[off+reclen-1] = 0; // null terminate
1524 reclen = (reclen + 3) & ~3; // add padding
1525 putInt(buf,off,reclen);
1526 putInt(buf,off+4,ino);
1533 protected FStat _fstat() {
1534 return new FStat() {
1535 public int type() { return S_IFDIR; }
1536 public int inode() { return myInode(); }
1537 public int dev() { return myDev(); }
1542 public static class DevFS extends FS {
1543 private static final int ROOT_INODE = 1;
1544 private static final int NULL_INODE = 2;
1545 private static final int ZERO_INODE = 3;
1546 private static final int FD_INODE = 4;
1547 private static final int FD_INODES = 32;
1549 private abstract class DevFStat extends FStat {
1550 public int dev() { return devno; }
1551 public int mode() { return 0666; }
1552 public int type() { return S_IFCHR; }
1553 public int nlink() { return 1; }
1554 public abstract int inode();
1557 private abstract class DevDirFD extends DirFD {
1558 public int myDev() { return devno; }
1561 private FD devZeroFD = new FD() {
1562 public int read(byte[] a, int off, int length) {
1563 /*Arrays.fill(a,off,off+length,(byte)0);*/
1564 for(int i=off;i<off+length;i++) a[i] = 0;
1567 public int write(byte[] a, int off, int length) { return length; }
1568 public int seek(int n, int whence) { return 0; }
1569 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1570 public int flags() { return O_RDWR; }
1572 private FD devNullFD = new FD() {
1573 public int read(byte[] a, int off, int length) { return 0; }
1574 public int write(byte[] a, int off, int length) { return length; }
1575 public int seek(int n, int whence) { return 0; }
1576 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1577 public int flags() { return O_RDWR; }
1580 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1581 if(path.equals("null")) return devNullFD;
1582 if(path.equals("zero")) return devZeroFD;
1583 if(path.startsWith("fd/")) {
1586 n = Integer.parseInt(path.substring(4));
1587 } catch(NumberFormatException e) {
1590 if(n < 0 || n >= OPEN_MAX) return null;
1591 if(r.fds[n] == null) return null;
1592 return r.fds[n].dup();
1594 if(path.equals("fd")) {
1596 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1597 final int[] files = new int[count];
1599 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1600 return new DevDirFD() {
1601 public int myInode() { return FD_INODE; }
1602 public int parentInode() { return ROOT_INODE; }
1603 public int inode(int n) { return FD_INODES + n; }
1604 public String name(int n) { return Integer.toString(files[n]); }
1605 public int size() { return files.length; }
1608 if(path.equals("")) {
1609 return new DevDirFD() {
1610 public int myInode() { return ROOT_INODE; }
1611 // HACK: We don't have any clean way to get the parent inode
1612 public int parentInode() { return ROOT_INODE; }
1613 public int inode(int n) {
1615 case 0: return NULL_INODE;
1616 case 1: return ZERO_INODE;
1617 case 2: return FD_INODE;
1622 public String name(int n) {
1624 case 0: return "null";
1625 case 1: return "zero";
1626 case 2: return "fd";
1627 default: return null;
1630 public int size() { return 3; }
1636 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1637 if(path.equals("null")) return devNullFD.fstat();
1638 if(path.equals("zero")) return devZeroFD.fstat();
1639 if(path.startsWith("fd/")) {
1642 n = Integer.parseInt(path.substring(3));
1643 } catch(NumberFormatException e) {
1646 if(n < 0 || n >= OPEN_MAX) return null;
1647 if(r.fds[n] == null) return null;
1648 return r.fds[n].fstat();
1650 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; }};
1651 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; }};
1655 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1656 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }