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});
412 } catch(NoSuchMethodException e) {
414 } catch(ClassNotFoundException e) {
417 runtimeCompilerCompile = m;
420 public Class runtimeCompile(Seekable s) 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"});
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 Class c = runtimeCompile(s);
488 if(c == null) throw new ErrnoException(ENOEXEC);
489 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
490 return execClass(c,argv,envp);
493 int n2 = s.read(buf,1,buf.length-1);
494 if(n2 == -1) return -ENOEXEC;
497 if(buf[1] != '!') return -ENOEXEC;
501 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
503 if(p == buf.length) break OUTER;
504 n = s.read(buf,p,buf.length-p);
507 for(arg=2;arg<p;arg++) if(buf[arg] == ' ') break;
509 while(arg < p && buf[arg] == ' ') arg++;
510 String[] command = new String[] {
511 new String(buf,2,cmdEnd),
512 arg < p ? new String(buf,arg,p-arg) : null
514 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
515 return execScript(path,command,argv,envp);
519 } catch(IOException e) {
526 public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
527 String[] newArgv = new String[argv.length + command[1] != null ? 2 : 1];
528 int p = command[0].lastIndexOf('/');
529 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
531 if(command[1] != null) newArgv[p++] = command[1];
532 newArgv[p++] = "/" + path;
533 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
534 return exec(command[0],newArgv,envp);
537 public int execClass(Class c,String[] argv, String[] envp) {
539 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
540 return exec(r,argv,envp);
541 } catch(Exception e) {
547 private int exec(UnixRuntime r, String[] argv, String[] envp) {
548 //System.err.println("Execing " + r);
549 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
551 r.closeOnExec = closeOnExec;
552 // make sure this doesn't get messed with these since we didn't copy them
570 private final byte[] pipebuf = new byte[PIPE_BUF*4];
572 private int writePos;
574 public final FD reader = new Reader();
575 public final FD writer = new Writer();
577 public class Reader extends FD {
578 protected FStat _fstat() { return new SocketFStat(); }
579 public int read(byte[] buf, int off, int len) throws ErrnoException {
580 if(len == 0) return 0;
581 synchronized(Pipe.this) {
582 while(writePos != -1 && readPos == writePos) {
583 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
585 if(writePos == -1) return 0; // eof
586 len = Math.min(len,writePos-readPos);
587 System.arraycopy(pipebuf,readPos,buf,off,len);
589 if(readPos == writePos) Pipe.this.notify();
593 public int flags() { return O_RDONLY; }
594 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
597 public class Writer extends FD {
598 protected FStat _fstat() { return new SocketFStat(); }
599 public int write(byte[] buf, int off, int len) throws ErrnoException {
600 if(len == 0) return 0;
601 synchronized(Pipe.this) {
602 if(readPos == -1) throw new ErrnoException(EPIPE);
603 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
604 // not enough space to atomicly write the data
605 while(readPos != -1 && readPos != writePos) {
606 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
608 if(readPos == -1) throw new ErrnoException(EPIPE);
609 readPos = writePos = 0;
611 len = Math.min(len,pipebuf.length - writePos);
612 System.arraycopy(buf,off,pipebuf,writePos,len);
613 if(readPos == writePos) Pipe.this.notify();
618 public int flags() { return O_WRONLY; }
619 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
623 private int sys_pipe(int addr) {
624 Pipe pipe = new Pipe();
626 int fd1 = addFD(pipe.reader);
627 if(fd1 < 0) return -ENFILE;
628 int fd2 = addFD(pipe.writer);
629 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
633 memWrite(addr+4,fd2);
634 } catch(FaultException e) {
642 private int sys_dup2(int oldd, int newd) {
643 if(oldd == newd) return 0;
644 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
645 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
646 if(fds[oldd] == null) return -EBADFD;
647 if(fds[newd] != null) fds[newd].close();
648 fds[newd] = fds[oldd].dup();
652 private int sys_dup(int oldd) {
653 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
654 if(fds[oldd] == null) return -EBADFD;
655 FD fd = fds[oldd].dup();
656 int newd = addFD(fd);
657 if(newd < 0) { fd.close(); return -ENFILE; }
661 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
662 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
663 if(s == null) return -ENOENT;
667 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
668 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
669 if(s == null) return -ENOENT;
673 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
674 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
678 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
679 gs.unlink(this,normalizePath(cstring(cstring)));
683 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
684 byte[] b = getBytes(cwd);
685 if(size == 0) return -EINVAL;
686 if(size < b.length+2) return -ERANGE;
688 copyout(b,addr+1,b.length);
689 memset(addr+b.length+1,0,1);
693 private int sys_chdir(int addr) throws ErrnoException, FaultException {
694 String path = normalizePath(cstring(addr));
695 FStat st = gs.stat(this,path);
696 if(st == null) return -ENOENT;
697 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
702 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
703 count = Math.min(count,MAX_CHUNK);
704 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
705 if(fds[fdn] == null) return -EBADFD;
706 byte[] buf = byteBuf(count);
707 int n = fds[fdn].getdents(buf,0,count);
712 static class SocketFD extends FD {
713 public static final int TYPE_STREAM = 0;
714 public static final int TYPE_DGRAM = 1;
715 public static final int LISTEN = 2;
716 public int type() { return flags & 1; }
717 public boolean listen() { return (flags & 2) != 0; }
726 InetAddress bindAddr;
728 InetAddress connectAddr;
729 int connectPort = -1;
735 private static final byte[] EMPTY = new byte[0];
736 public SocketFD(int type) {
738 if(type == TYPE_DGRAM)
739 dp = new DatagramPacket(EMPTY,0);
742 public void setOptions() {
744 if(s != null && type() == TYPE_STREAM && !listen()) {
745 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
747 } catch(SocketException e) {
748 if(STDERR_DIAG) e.printStackTrace();
752 public void _close() {
754 if(s != null) s.close();
755 if(ss != null) ss.close();
756 if(ds != null) ds.close();
757 } catch(IOException e) {
762 public int read(byte[] a, int off, int length) throws ErrnoException {
763 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
764 if(is == null) throw new ErrnoException(EPIPE);
766 int n = is.read(a,off,length);
767 return n < 0 ? 0 : n;
768 } catch(IOException e) {
769 throw new ErrnoException(EIO);
773 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
774 if(type() == TYPE_STREAM) return read(a,off,length);
776 if(off != 0) throw new IllegalArgumentException("off must be 0");
778 dp.setLength(length);
780 if(ds == null) ds = new DatagramSocket();
782 } catch(IOException e) {
783 if(STDERR_DIAG) e.printStackTrace();
784 throw new ErrnoException(EIO);
786 if(sockAddr != null) {
787 sockAddr[0] = dp.getAddress();
788 port[0] = dp.getPort();
790 return dp.getLength();
793 public int write(byte[] a, int off, int length) throws ErrnoException {
794 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
796 if(os == null) throw new ErrnoException(EPIPE);
798 os.write(a,off,length);
800 } catch(IOException e) {
801 throw new ErrnoException(EIO);
805 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
806 if(off != 0) throw new IllegalArgumentException("off must be 0");
807 if(type() == TYPE_STREAM) return write(a,off,length);
809 if(destAddr == null) {
810 destAddr = connectAddr;
811 destPort = connectPort;
813 if(destAddr == null) throw new ErrnoException(ENOTCONN);
816 dp.setAddress(destAddr);
817 dp.setPort(destPort);
819 dp.setLength(length);
822 if(ds == null) ds = new DatagramSocket();
824 } catch(IOException e) {
825 if(STDERR_DIAG) e.printStackTrace();
826 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
827 throw new ErrnoException(EIO);
829 return dp.getLength();
832 public int flags() { return O_RDWR; }
833 public FStat _fstat() { return new SocketFStat(); }
836 private int sys_socket(int domain, int type, int proto) {
837 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
838 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
841 private SocketFD getSocketFD(int fdn) throws ErrnoException {
842 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
843 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
844 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
846 return (SocketFD) fds[fdn];
849 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
850 SocketFD fd = getSocketFD(fdn);
852 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
853 int word1 = memRead(addr);
854 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
855 int port = word1 & 0xffff;
856 byte[] ip = new byte[4];
859 InetAddress inetAddr;
861 inetAddr = Platform.inetAddressFromBytes(ip);
862 } catch(UnknownHostException e) {
863 return -EADDRNOTAVAIL;
866 fd.connectAddr = inetAddr;
867 fd.connectPort = port;
871 case SocketFD.TYPE_STREAM: {
872 Socket s = new Socket(inetAddr,port);
875 fd.is = s.getInputStream();
876 fd.os = s.getOutputStream();
879 case SocketFD.TYPE_DGRAM:
882 throw new Error("should never happen");
884 } catch(IOException e) {
885 return -ECONNREFUSED;
891 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
892 String hostname = cstring(chostname);
893 int size = memRead(sizeAddr);
894 InetAddress[] inetAddrs;
896 inetAddrs = InetAddress.getAllByName(hostname);
897 } catch(UnknownHostException e) {
898 return HOST_NOT_FOUND;
900 int count = min(size/4,inetAddrs.length);
901 for(int i=0;i<count;i++,addr+=4) {
902 byte[] b = inetAddrs[i].getAddress();
905 memWrite(sizeAddr,count*4);
909 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
910 SocketFD fd = getSocketFD(fdn);
916 if(len != 4) return -EINVAL;
917 int val = memRead(valaddr);
918 if(val != 0) fd.options |= name;
919 else fd.options &= ~name;
924 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
928 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
933 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
934 SocketFD fd = getSocketFD(fdn);
940 int len = memRead(lenaddr);
941 if(len < 4) return -EINVAL;
942 int val = (fd.options & name) != 0 ? 1 : 0;
943 memWrite(valaddr,val);
948 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
952 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
957 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
958 SocketFD fd = getSocketFD(fdn);
960 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
961 int word1 = memRead(addr);
962 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
963 int port = word1 & 0xffff;
964 InetAddress inetAddr = null;
965 if(memRead(addr+4) != 0) {
966 byte[] ip = new byte[4];
970 inetAddr = Platform.inetAddressFromBytes(ip);
971 } catch(UnknownHostException e) {
972 return -EADDRNOTAVAIL;
977 case SocketFD.TYPE_STREAM: {
978 fd.bindAddr = inetAddr;
982 case SocketFD.TYPE_DGRAM: {
983 if(fd.ds != null) fd.ds.close();
985 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
986 } catch(IOException e) {
992 throw new Error("should never happen");
996 private int sys_listen(int fdn, int backlog) throws ErrnoException {
997 SocketFD fd = getSocketFD(fdn);
998 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
999 if(fd.ss != null || fd.s != null) return -EISCONN;
1000 if(fd.bindPort < 0) return -EOPNOTSUPP;
1003 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
1004 fd.flags |= SocketFD.LISTEN;
1006 } catch(IOException e) {
1012 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
1013 SocketFD fd = getSocketFD(fdn);
1014 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1015 if(!fd.listen()) return -EOPNOTSUPP;
1017 int size = memRead(lenaddr);
1019 ServerSocket s = fd.ss;
1022 client = s.accept();
1023 } catch(IOException e) {
1028 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
1029 byte[] b = client.getInetAddress().getAddress();
1030 copyout(b,addr+4,4);
1031 memWrite(lenaddr,8);
1034 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
1035 clientFD.s = client;
1037 clientFD.is = client.getInputStream();
1038 clientFD.os = client.getOutputStream();
1039 } catch(IOException e) {
1042 int n = addFD(clientFD);
1043 if(n == -1) { clientFD.close(); return -ENFILE; }
1047 private int sys_shutdown(int fdn, int how) throws ErrnoException {
1048 SocketFD fd = getSocketFD(fdn);
1049 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
1050 if(fd.s == null) return -ENOTCONN;
1055 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
1056 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
1057 } catch(IOException e) {
1064 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
1065 SocketFD fd = getSocketFD(fdn);
1066 if(flags != 0) throw new ErrnoException(EINVAL);
1068 int word1 = memRead(destAddr);
1069 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1070 int port = word1 & 0xffff;
1071 InetAddress inetAddr;
1072 byte[] ip = new byte[4];
1073 copyin(destAddr+4,ip,4);
1075 inetAddr = Platform.inetAddressFromBytes(ip);
1076 } catch(UnknownHostException e) {
1077 return -EADDRNOTAVAIL;
1080 count = Math.min(count,MAX_CHUNK);
1081 byte[] buf = byteBuf(count);
1082 copyin(addr,buf,count);
1084 return fd.sendto(buf,0,count,inetAddr,port);
1085 } catch(ErrnoException e) {
1086 if(e.errno == EPIPE) exit(128+13,true);
1091 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
1092 SocketFD fd = getSocketFD(fdn);
1093 if(flags != 0) throw new ErrnoException(EINVAL);
1095 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
1096 int[] port = sourceAddr == 0 ? null : new int[1];
1098 count = Math.min(count,MAX_CHUNK);
1099 byte[] buf = byteBuf(count);
1100 int n = fd.recvfrom(buf,0,count,inetAddr,port);
1101 copyout(buf,addr,n);
1103 if(sourceAddr != 0) {
1104 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
1105 byte[] ip = inetAddr[0].getAddress();
1106 copyout(ip,sourceAddr+4,4);
1112 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
1116 private static String hostName() {
1118 return InetAddress.getLocalHost().getHostName();
1119 } catch(UnknownHostException e) {
1124 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
1125 if(newp != 0) return -EPERM;
1126 if(namelen == 0) return -ENOENT;
1127 if(oldp == 0) return 0;
1130 switch(memRead(nameaddr)) {
1132 if(namelen != 2) break;
1133 switch(memRead(nameaddr+4)) {
1134 case KERN_OSTYPE: o = "NestedVM"; break;
1135 case KERN_HOSTNAME: o = hostName(); break;
1136 case KERN_OSRELEASE: o = VERSION; break;
1137 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
1141 if(namelen != 2) break;
1142 switch(memRead(nameaddr+4)) {
1143 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
1147 if(o == null) return -ENOENT;
1148 int len = memRead(oldlenaddr);
1149 if(o instanceof String) {
1150 byte[] b = getNullTerminatedBytes((String)o);
1151 if(len < b.length) return -ENOMEM;
1153 copyout(b,oldp,len);
1154 memWrite(oldlenaddr,len);
1155 } else if(o instanceof Integer) {
1156 if(len < 4) return -ENOMEM;
1157 memWrite(oldp,((Integer)o).intValue());
1159 throw new Error("should never happen");
1164 public static final class GlobalState {
1165 Hashtable execCache = new Hashtable();
1167 final UnixRuntime[] tasks;
1170 private MP[] mps = new MP[0];
1173 public GlobalState() { this(255); }
1174 public GlobalState(int maxProcs) { this(maxProcs,true); }
1175 public GlobalState(int maxProcs, boolean defaultMounts) {
1176 tasks = new UnixRuntime[maxProcs+1];
1178 addMount("/",new HostFS());
1179 addMount("/dev",new DevFS());
1183 static class MP implements Sort.Comparable {
1184 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1187 public int compareTo(Object o) {
1188 if(!(o instanceof MP)) return 1;
1189 return -path.compareTo(((MP)o).path);
1193 public synchronized FS getMount(String path) {
1194 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1195 if(path.equals("/")) return root;
1196 path = path.substring(1);
1197 for(int i=0;i<mps.length;i++)
1198 if(mps[i].path.equals(path)) return mps[i].fs;
1202 public synchronized void addMount(String path, FS fs) {
1203 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1204 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1206 if(fs.owner != null) fs.owner.removeMount(fs);
1209 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1210 path = path.substring(1);
1211 int oldLength = mps.length;
1212 MP[] newMPS = new MP[oldLength + 1];
1213 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1214 newMPS[oldLength] = new MP(path,fs);
1218 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1219 fs.devno = highdevno + 2;
1222 public synchronized void removeMount(FS fs) {
1223 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1224 throw new IllegalArgumentException("mount point doesn't exist");
1227 public synchronized void removeMount(String path) {
1228 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1229 if(path.equals("/")) {
1232 path = path.substring(1);
1234 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1235 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1240 private void removeMount(int index) {
1241 if(index == -1) { root.owner = null; root = null; return; }
1242 MP[] newMPS = new MP[mps.length - 1];
1243 System.arraycopy(mps,0,newMPS,0,index);
1244 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1248 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1249 int pl = normalizedPath.length();
1252 synchronized(this) { list = mps; }
1253 for(int i=0;i<list.length;i++) {
1255 int mpl = mp.path.length();
1256 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1257 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1260 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1263 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1264 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1265 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1266 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1267 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1269 private static class CacheEnt {
1270 public final long time;
1271 public final long size;
1272 public final Object o;
1273 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1277 public abstract static class FS {
1278 static final int OPEN = 1;
1279 static final int STAT = 2;
1280 static final int LSTAT = 3;
1281 static final int MKDIR = 4;
1282 static final int UNLINK = 5;
1287 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1289 case OPEN: return open(r,path,arg1,arg2);
1290 case STAT: return stat(r,path);
1291 case LSTAT: return lstat(r,path);
1292 case MKDIR: mkdir(r,path,arg1); return null;
1293 case UNLINK: unlink(r,path); return null;
1294 default: throw new Error("should never happen");
1298 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1300 // If this returns null it'll be truned into an ENOENT
1301 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1302 // If this returns null it'll be turned into an ENOENT
1303 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1304 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1305 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1308 // chroot support should go in here if it is ever implemented chroot support in here
1309 private String normalizePath(String path) {
1310 boolean absolute = path.startsWith("/");
1311 int cwdl = cwd.length();
1313 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1314 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1315 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1317 char[] in = new char[path.length()+1];
1318 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1322 do { inp++; } while(in[inp] == '/');
1323 } else if(cwdl != 0) {
1324 cwd.getChars(0,cwdl,out,0);
1328 path.getChars(0,path.length(),in,0);
1329 while(in[inp] != 0) {
1331 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1332 if(in[inp] == '\0') break;
1333 while(in[inp] == '/') inp++;
1337 if(in[inp] == '\0') break;
1338 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1340 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1341 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1342 // Just read a /..{$,/}
1344 if(outp > 0) outp--;
1345 while(outp > 0 && out[outp] != '/') outp--;
1346 //System.err.println("After ..: " + new String(out,0,outp));
1349 // Just read a /.[^.] or /..[^/$]
1354 if(outp > 0 && out[outp-1] == '/') outp--;
1355 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1356 return new String(out,0,outp);
1359 FStat hostFStat(final File f, Object data) {
1362 FileInputStream fis = new FileInputStream(f);
1363 switch(fis.read()) {
1364 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1365 case '#': e = fis.read() == '!';
1368 } catch(IOException e2) { }
1369 HostFS fs = (HostFS) data;
1370 final int inode = fs.inodes.get(f.getAbsolutePath());
1371 final int devno = fs.devno;
1372 return new HostFStat(f,e) {
1373 public int inode() { return inode; }
1374 public int dev() { return devno; }
1378 FD hostFSDirFD(File f, Object _fs) {
1379 HostFS fs = (HostFS) _fs;
1380 return fs.new HostDirFD(f);
1383 public static class HostFS extends FS {
1384 InodeCache inodes = new InodeCache(4000);
1385 protected File root;
1386 public File getRoot() { return root; }
1388 static File hostRootDir() {
1389 if(Platform.getProperty("nestedvm.root") != null) {
1390 File f = new File(Platform.getProperty("nestedvm.root"));
1391 if(f.isDirectory()) return f;
1392 // fall through to case below
1394 String cwd = Platform.getProperty("user.dir");
1395 File f = new File(cwd != null ? cwd : ".");
1396 if(!f.exists()) throw new Error("Couldn't get File for cwd");
1397 f = new File(f.getAbsolutePath());
1398 while(f.getParent() != null) f = new File(f.getParent());
1399 // This works around a bug in some versions of ClassPath
1400 if(f.getPath().length() == 0) f = new File("/");
1404 private File hostFile(String path) {
1405 char sep = File.separatorChar;
1407 char buf[] = path.toCharArray();
1408 for(int i=0;i<buf.length;i++) {
1410 if(c == '/') buf[i] = sep;
1411 else if(c == sep) buf[i] = '/';
1413 path = new String(buf);
1415 return new File(root,path);
1418 public HostFS() { this(hostRootDir()); }
1419 public HostFS(String root) { this(new File(root)); }
1420 public HostFS(File root) { this.root = root; }
1423 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1424 final File f = hostFile(path);
1425 return r.hostFSOpen(f,flags,mode,this);
1428 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1429 File f = hostFile(path);
1430 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1431 if(!f.exists()) throw new ErrnoException(ENOENT);
1432 if(!f.delete()) throw new ErrnoException(EPERM);
1435 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1436 File f = hostFile(path);
1437 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1438 if(!f.exists()) return null;
1439 return r.hostFStat(f,this);
1442 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1443 File f = hostFile(path);
1444 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1445 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1446 if(f.exists()) throw new ErrnoException(ENOTDIR);
1447 File parent = getParentFile(f);
1448 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1449 if(!f.mkdir()) throw new ErrnoException(EIO);
1452 private static File getParentFile(File f) {
1453 String p = f.getParent();
1454 return p == null ? null : new File(p);
1457 public class HostDirFD extends DirFD {
1458 private final File f;
1459 private final File[] children;
1460 public HostDirFD(File f) {
1462 String[] l = f.list();
1463 children = new File[l.length];
1464 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1466 public int size() { return children.length; }
1467 public String name(int n) { return children[n].getName(); }
1468 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1469 public int parentInode() {
1470 File parent = getParentFile(f);
1471 // HACK: myInode() isn't really correct if we're not the root
1472 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1474 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1475 public int myDev() { return devno; }
1479 private static void putInt(byte[] buf, int off, int n) {
1480 buf[off+0] = (byte)((n>>>24)&0xff);
1481 buf[off+1] = (byte)((n>>>16)&0xff);
1482 buf[off+2] = (byte)((n>>> 8)&0xff);
1483 buf[off+3] = (byte)((n>>> 0)&0xff);
1486 public static abstract class DirFD extends FD {
1487 private int pos = -2;
1489 protected abstract int size();
1490 protected abstract String name(int n);
1491 protected abstract int inode(int n);
1492 protected abstract int myDev();
1493 protected abstract int parentInode();
1494 protected abstract int myInode();
1495 public int flags() { return O_RDONLY; }
1497 public int getdents(byte[] buf, int off, int len) {
1501 OUTER: for(;len > 0 && pos < size();pos++){
1505 ino = pos == -1 ? parentInode() : myInode();
1506 if(ino == -1) continue;
1507 reclen = 9 + (pos == -1 ? 2 : 1);
1508 if(reclen > len) break OUTER;
1510 if(pos == -1) buf[off+9] = '.';
1513 String f = name(pos);
1514 byte[] fb = getBytes(f);
1515 reclen = fb.length + 9;
1516 if(reclen > len) break OUTER;
1518 System.arraycopy(fb,0,buf,off+8,fb.length);
1521 buf[off+reclen-1] = 0; // null terminate
1522 reclen = (reclen + 3) & ~3; // add padding
1523 putInt(buf,off,reclen);
1524 putInt(buf,off+4,ino);
1531 protected FStat _fstat() {
1532 return new FStat() {
1533 public int type() { return S_IFDIR; }
1534 public int inode() { return myInode(); }
1535 public int dev() { return myDev(); }
1540 public static class DevFS extends FS {
1541 private static final int ROOT_INODE = 1;
1542 private static final int NULL_INODE = 2;
1543 private static final int ZERO_INODE = 3;
1544 private static final int FD_INODE = 4;
1545 private static final int FD_INODES = 32;
1547 private abstract class DevFStat extends FStat {
1548 public int dev() { return devno; }
1549 public int mode() { return 0666; }
1550 public int type() { return S_IFCHR; }
1551 public int nlink() { return 1; }
1552 public abstract int inode();
1555 private abstract class DevDirFD extends DirFD {
1556 public int myDev() { return devno; }
1559 private FD devZeroFD = new FD() {
1560 public int read(byte[] a, int off, int length) {
1561 /*Arrays.fill(a,off,off+length,(byte)0);*/
1562 for(int i=off;i<off+length;i++) a[i] = 0;
1565 public int write(byte[] a, int off, int length) { return length; }
1566 public int seek(int n, int whence) { return 0; }
1567 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1568 public int flags() { return O_RDWR; }
1570 private FD devNullFD = new FD() {
1571 public int read(byte[] a, int off, int length) { return 0; }
1572 public int write(byte[] a, int off, int length) { return length; }
1573 public int seek(int n, int whence) { return 0; }
1574 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1575 public int flags() { return O_RDWR; }
1578 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1579 if(path.equals("null")) return devNullFD;
1580 if(path.equals("zero")) return devZeroFD;
1581 if(path.startsWith("fd/")) {
1584 n = Integer.parseInt(path.substring(4));
1585 } catch(NumberFormatException e) {
1588 if(n < 0 || n >= OPEN_MAX) return null;
1589 if(r.fds[n] == null) return null;
1590 return r.fds[n].dup();
1592 if(path.equals("fd")) {
1594 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1595 final int[] files = new int[count];
1597 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1598 return new DevDirFD() {
1599 public int myInode() { return FD_INODE; }
1600 public int parentInode() { return ROOT_INODE; }
1601 public int inode(int n) { return FD_INODES + n; }
1602 public String name(int n) { return Integer.toString(files[n]); }
1603 public int size() { return files.length; }
1606 if(path.equals("")) {
1607 return new DevDirFD() {
1608 public int myInode() { return ROOT_INODE; }
1609 // HACK: We don't have any clean way to get the parent inode
1610 public int parentInode() { return ROOT_INODE; }
1611 public int inode(int n) {
1613 case 0: return NULL_INODE;
1614 case 1: return ZERO_INODE;
1615 case 2: return FD_INODE;
1620 public String name(int n) {
1622 case 0: return "null";
1623 case 1: return "zero";
1624 case 2: return "fd";
1625 default: return null;
1628 public int size() { return 3; }
1634 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1635 if(path.equals("null")) return devNullFD.fstat();
1636 if(path.equals("zero")) return devZeroFD.fstat();
1637 if(path.startsWith("fd/")) {
1640 n = Integer.parseInt(path.substring(3));
1641 } catch(NumberFormatException e) {
1644 if(n < 0 || n >= OPEN_MAX) return null;
1645 if(r.fds[n] == null) return null;
1646 return r.fds[n].fstat();
1648 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; }};
1649 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; }};
1653 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1654 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }