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);
177 case SYS_umask: return sys_umask(a);
179 default: return super._syscall(syscall,a,b,c,d,e,f);
183 FD _open(String path, int flags, int mode) throws ErrnoException {
184 return gs.open(this,normalizePath(path),flags,mode);
187 private int sys_getppid() {
188 return parent == null ? 1 : parent.pid;
191 private int sys_chown(int fileAddr, int uid, int gid) {
194 private int sys_lchown(int fileAddr, int uid, int gid) {
197 private int sys_fchown(int fd, int uid, int gid) {
200 private int sys_chmod(int fileAddr, int uid, int gid) {
203 private int sys_fchmod(int fd, int uid, int gid) {
206 private int sys_umask(int mask) {
210 private int sys_access(int cstring, int mode) throws ErrnoException, ReadFaultException {
211 // FEATURE: sys_access
212 return gs.stat(this,cstring(cstring)) == null ? -ENOENT : 0;
215 private int sys_realpath(int inAddr, int outAddr) throws FaultException {
216 String s = normalizePath(cstring(inAddr));
217 byte[] b = getNullTerminatedBytes(s);
218 if(b.length > PATH_MAX) return -ERANGE;
219 copyout(b,outAddr,b.length);
223 // FEATURE: Signal handling
224 // check flag only on backwards jumps to basic blocks without compulsatory checks
225 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
227 /** The kill syscall.
228 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
229 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
230 Anything else terminates the process. */
231 private int sys_kill(int pid, int signal) {
232 // This will only be called by raise() in newlib to invoke the default handler
233 // We don't have to worry about actually delivering the signal
234 if(pid != pid) return -ESRCH;
235 if(signal < 0 || signal >= 32) return -EINVAL;
248 exit(128+signal, true);
253 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
254 final int WNOHANG = 1;
255 if((options & ~(WNOHANG)) != 0) return -EINVAL;
256 if(pid == 0 || pid < -1) {
257 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
260 boolean blocking = (options&WNOHANG)==0;
262 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
263 if(children == null) return blocking ? -ECHILD : 0;
265 UnixRuntime done = null;
267 synchronized(children) {
270 if(exitedChildren.size() > 0) {
271 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
272 exitedChildren.removeElementAt(exitedChildren.size() - 1);
275 if(pid >= gs.tasks.length) return -ECHILD;
276 UnixRuntime t = gs.tasks[pid];
277 if(t.parent != this) return -ECHILD;
278 if(t.state == EXITED) {
279 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
283 // process group stuff, EINVAL returned above
284 throw new Error("should never happen");
287 if(!blocking) return 0;
288 try { children.wait(); } catch(InterruptedException e) {}
289 //System.err.println("waitpid woke up: " + exitedChildren.size());
291 gs.tasks[done.pid] = null;
296 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
302 if(children != null) synchronized(children) {
303 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
304 UnixRuntime child = (UnixRuntime) e.nextElement();
305 gs.tasks[child.pid] = null;
307 exitedChildren.removeAllElements();
308 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
309 UnixRuntime child = (UnixRuntime) e.nextElement();
312 activeChildren.removeAllElements();
315 UnixRuntime _parent = parent;
316 if(_parent == null) {
317 gs.tasks[pid] = null;
319 synchronized(_parent.children) {
321 gs.tasks[pid] = null;
323 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
324 parent.exitedChildren.addElement(this);
325 parent.children.notify();
331 protected Object clone() throws CloneNotSupportedException {
332 UnixRuntime r = (UnixRuntime) super.clone();
336 r.activeChildren = r.exitedChildren = null;
340 private int sys_fork() {
344 r = (UnixRuntime) clone();
345 } catch(Exception e) {
354 } catch(ProcessTableFullExn e) {
358 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
359 if(children == null) {
360 children = new Object();
361 activeChildren = new Vector();
362 exitedChildren = new Vector();
364 activeChildren.addElement(r);
366 CPUState state = new CPUState();
368 state.r[V0] = 0; // return 0 to child
369 state.pc += 4; // skip over syscall instruction
370 r.setCPUState(state);
373 new ForkedProcess(r);
378 public static final class ForkedProcess extends Thread {
379 private final UnixRuntime initial;
380 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
381 public void run() { UnixRuntime.executeAndExec(initial); }
384 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
385 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
387 public static int executeAndExec(UnixRuntime r) {
390 if(r.execute()) break;
391 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
393 if(r.state != EXECED) return r.exitStatus();
398 private String[] readStringArray(int addr) throws ReadFaultException {
400 for(int p=addr;memRead(p) != 0;p+=4) count++;
401 String[] a = new String[count];
402 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
406 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
407 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
410 private final static Method runtimeCompilerCompile;
414 m = Class.forName("org.ibex.nestedvm.RuntimeCompiler").getMethod("compile",new Class[]{Seekable.class,String.class,String.class});
415 } catch(NoSuchMethodException e) {
417 } catch(ClassNotFoundException e) {
420 runtimeCompilerCompile = m;
423 public Class runtimeCompile(Seekable s, String sourceName) throws IOException {
424 if(runtimeCompilerCompile == null) {
425 if(STDERR_DIAG) System.err.println("WARNING: Exec attempted but RuntimeCompiler not found!");
430 return (Class) runtimeCompilerCompile.invoke(null,new Object[]{s,"unixruntime,maxinsnpermethod=256,lessconstants",sourceName});
431 } catch(IllegalAccessException e) {
434 } catch(InvocationTargetException e) {
435 Throwable t = e.getTargetException();
436 if(t instanceof IOException) throw (IOException) t;
437 if(t instanceof RuntimeException) throw (RuntimeException) t;
438 if(t instanceof Error) throw (Error) t;
439 if(STDERR_DIAG) t.printStackTrace();
444 private int exec(String path, String[] argv, String[] envp) throws ErrnoException {
445 if(argv.length == 0) argv = new String[]{""};
446 // HACK: Hideous hack to make a standalone busybox possible
447 if(path.equals("bin/busybox") && getClass().getName().endsWith("BusyBox"))
448 return execClass(getClass(),argv,envp);
450 // NOTE: For this little hack to work nestedvm.root MUST be "."
452 System.err.println("Execing normalized path: " + normalizedPath);
453 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
454 } catch(IOException e) { throw new Error(e); }*/
456 FStat fstat = gs.stat(this,path);
457 if(fstat == null) return -ENOENT;
458 GlobalState.CacheEnt ent = (GlobalState.CacheEnt) gs.execCache.get(path);
459 long mtime = fstat.mtime();
460 long size = fstat.size();
462 //System.err.println("Found cached entry for " + path);
463 if(ent.time ==mtime && ent.size == size) {
464 if(ent.o instanceof Class)
465 return execClass((Class) ent.o,argv,envp);
466 if(ent.o instanceof String[])
467 return execScript(path,(String[]) ent.o,argv,envp);
468 throw new Error("should never happen");
470 //System.err.println("Cache was out of date");
471 gs.execCache.remove(path);
474 FD fd = gs.open(this,path,RD_ONLY,0);
475 if(fd == null) throw new ErrnoException(ENOENT);
476 Seekable s = fd.seekable();
477 if(s == null) throw new ErrnoException(EACCES);
479 byte[] buf = new byte[4096];
482 int n = s.read(buf,0,buf.length);
483 if(n == -1) throw new ErrnoException(ENOEXEC);
486 case '\177': // possible ELF
487 if(n < 4) s.tryReadFully(buf,n,4-n);
488 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') return -ENOEXEC;
490 if(STDERR_DIAG) System.err.println("Running RuntimeCompiler for " + path);
491 Class c = runtimeCompile(s,path);
492 if(STDERR_DIAG) System.err.println("RuntimeCompiler finished for " + path);
493 if(c == null) throw new ErrnoException(ENOEXEC);
494 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
495 return execClass(c,argv,envp);
498 int n2 = s.read(buf,1,buf.length-1);
499 if(n2 == -1) return -ENOEXEC;
502 if(buf[1] != '!') return -ENOEXEC;
506 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
508 if(p == buf.length) break OUTER;
509 n = s.read(buf,p,buf.length-p);
512 for(;cmdStart<p;cmdStart++) if(buf[cmdStart]!=' ') break;
513 if(cmdStart == p) throw new ErrnoException(ENOEXEC);
514 int argStart = cmdStart;
515 for(;argStart<p;argStart++) if(buf[argStart] == ' ') break;
516 int cmdEnd = argStart;
517 while(argStart < p && buf[argStart] == ' ') argStart++;
518 String[] command = new String[] {
519 new String(buf,cmdStart,cmdEnd-cmdStart),
520 argStart < p ? new String(buf,argStart,p-argStart) : null
522 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
523 return execScript(path,command,argv,envp);
527 } catch(IOException e) {
534 public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
535 String[] newArgv = new String[argv.length-1 + (command[1] != null ? 3 : 2)];
536 int p = command[0].lastIndexOf('/');
537 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
538 newArgv[1] = "/" + path;
540 if(command[1] != null) newArgv[p++] = command[1];
541 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
542 if(p != newArgv.length) throw new Error("p != newArgv.length");
543 System.err.println("Execing: " + command[0]);
544 for(int i=0;i<newArgv.length;i++) System.err.println("execing [" + i + "] " + newArgv[i]);
545 return exec(command[0],newArgv,envp);
548 public int execClass(Class c,String[] argv, String[] envp) {
550 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
551 return exec(r,argv,envp);
552 } catch(Exception e) {
558 private int exec(UnixRuntime r, String[] argv, String[] envp) {
559 //System.err.println("Execing " + r);
560 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
562 r.closeOnExec = closeOnExec;
563 // make sure this doesn't get messed with these since we didn't copy them
581 private final byte[] pipebuf = new byte[PIPE_BUF*4];
583 private int writePos;
585 public final FD reader = new Reader();
586 public final FD writer = new Writer();
588 public class Reader extends FD {
589 protected FStat _fstat() { return new SocketFStat(); }
590 public int read(byte[] buf, int off, int len) throws ErrnoException {
591 if(len == 0) return 0;
592 synchronized(Pipe.this) {
593 while(writePos != -1 && readPos == writePos) {
594 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
596 if(writePos == -1) return 0; // eof
597 len = Math.min(len,writePos-readPos);
598 System.arraycopy(pipebuf,readPos,buf,off,len);
600 if(readPos == writePos) Pipe.this.notify();
604 public int flags() { return O_RDONLY; }
605 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
608 public class Writer extends FD {
609 protected FStat _fstat() { return new SocketFStat(); }
610 public int write(byte[] buf, int off, int len) throws ErrnoException {
611 if(len == 0) return 0;
612 synchronized(Pipe.this) {
613 if(readPos == -1) throw new ErrnoException(EPIPE);
614 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
615 // not enough space to atomicly write the data
616 while(readPos != -1 && readPos != writePos) {
617 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
619 if(readPos == -1) throw new ErrnoException(EPIPE);
620 readPos = writePos = 0;
622 len = Math.min(len,pipebuf.length - writePos);
623 System.arraycopy(buf,off,pipebuf,writePos,len);
624 if(readPos == writePos) Pipe.this.notify();
629 public int flags() { return O_WRONLY; }
630 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
634 private int sys_pipe(int addr) {
635 Pipe pipe = new Pipe();
637 int fd1 = addFD(pipe.reader);
638 if(fd1 < 0) return -ENFILE;
639 int fd2 = addFD(pipe.writer);
640 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
644 memWrite(addr+4,fd2);
645 } catch(FaultException e) {
653 private int sys_dup2(int oldd, int newd) {
654 if(oldd == newd) return 0;
655 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
656 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
657 if(fds[oldd] == null) return -EBADFD;
658 if(fds[newd] != null) fds[newd].close();
659 fds[newd] = fds[oldd].dup();
663 private int sys_dup(int oldd) {
664 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
665 if(fds[oldd] == null) return -EBADFD;
666 FD fd = fds[oldd].dup();
667 int newd = addFD(fd);
668 if(newd < 0) { fd.close(); return -ENFILE; }
672 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
673 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
674 if(s == null) return -ENOENT;
678 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
679 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
680 if(s == null) return -ENOENT;
684 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
685 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
689 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
690 gs.unlink(this,normalizePath(cstring(cstring)));
694 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
695 byte[] b = getBytes(cwd);
696 if(size == 0) return -EINVAL;
697 if(size < b.length+2) return -ERANGE;
699 copyout(b,addr+1,b.length);
700 memset(addr+b.length+1,0,1);
704 private int sys_chdir(int addr) throws ErrnoException, FaultException {
705 String path = normalizePath(cstring(addr));
706 FStat st = gs.stat(this,path);
707 if(st == null) return -ENOENT;
708 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
713 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
714 count = Math.min(count,MAX_CHUNK);
715 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
716 if(fds[fdn] == null) return -EBADFD;
717 byte[] buf = byteBuf(count);
718 int n = fds[fdn].getdents(buf,0,count);
723 static class SocketFD extends FD {
724 public static final int TYPE_STREAM = 0;
725 public static final int TYPE_DGRAM = 1;
726 public static final int LISTEN = 2;
727 public int type() { return flags & 1; }
728 public boolean listen() { return (flags & 2) != 0; }
737 InetAddress bindAddr;
739 InetAddress connectAddr;
740 int connectPort = -1;
746 private static final byte[] EMPTY = new byte[0];
747 public SocketFD(int type) {
749 if(type == TYPE_DGRAM)
750 dp = new DatagramPacket(EMPTY,0);
753 public void setOptions() {
755 if(s != null && type() == TYPE_STREAM && !listen()) {
756 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
758 } catch(SocketException e) {
759 if(STDERR_DIAG) e.printStackTrace();
763 public void _close() {
765 if(s != null) s.close();
766 if(ss != null) ss.close();
767 if(ds != null) ds.close();
768 } catch(IOException e) {
773 public int read(byte[] a, int off, int length) throws ErrnoException {
774 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
775 if(is == null) throw new ErrnoException(EPIPE);
777 int n = is.read(a,off,length);
778 return n < 0 ? 0 : n;
779 } catch(IOException e) {
780 throw new ErrnoException(EIO);
784 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
785 if(type() == TYPE_STREAM) return read(a,off,length);
787 if(off != 0) throw new IllegalArgumentException("off must be 0");
789 dp.setLength(length);
791 if(ds == null) ds = new DatagramSocket();
793 } catch(IOException e) {
794 if(STDERR_DIAG) e.printStackTrace();
795 throw new ErrnoException(EIO);
797 if(sockAddr != null) {
798 sockAddr[0] = dp.getAddress();
799 port[0] = dp.getPort();
801 return dp.getLength();
804 public int write(byte[] a, int off, int length) throws ErrnoException {
805 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
807 if(os == null) throw new ErrnoException(EPIPE);
809 os.write(a,off,length);
811 } catch(IOException e) {
812 throw new ErrnoException(EIO);
816 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
817 if(off != 0) throw new IllegalArgumentException("off must be 0");
818 if(type() == TYPE_STREAM) return write(a,off,length);
820 if(destAddr == null) {
821 destAddr = connectAddr;
822 destPort = connectPort;
824 if(destAddr == null) throw new ErrnoException(ENOTCONN);
827 dp.setAddress(destAddr);
828 dp.setPort(destPort);
830 dp.setLength(length);
833 if(ds == null) ds = new DatagramSocket();
835 } catch(IOException e) {
836 if(STDERR_DIAG) e.printStackTrace();
837 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
838 throw new ErrnoException(EIO);
840 return dp.getLength();
843 public int flags() { return O_RDWR; }
844 public FStat _fstat() { return new SocketFStat(); }
847 private int sys_socket(int domain, int type, int proto) {
848 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
849 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
852 private SocketFD getSocketFD(int fdn) throws ErrnoException {
853 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
854 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
855 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
857 return (SocketFD) fds[fdn];
860 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
861 SocketFD fd = getSocketFD(fdn);
863 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
864 int word1 = memRead(addr);
865 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
866 int port = word1 & 0xffff;
867 byte[] ip = new byte[4];
870 InetAddress inetAddr;
872 inetAddr = Platform.inetAddressFromBytes(ip);
873 } catch(UnknownHostException e) {
874 return -EADDRNOTAVAIL;
877 fd.connectAddr = inetAddr;
878 fd.connectPort = port;
882 case SocketFD.TYPE_STREAM: {
883 Socket s = new Socket(inetAddr,port);
886 fd.is = s.getInputStream();
887 fd.os = s.getOutputStream();
890 case SocketFD.TYPE_DGRAM:
893 throw new Error("should never happen");
895 } catch(IOException e) {
896 return -ECONNREFUSED;
902 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
903 String hostname = cstring(chostname);
904 int size = memRead(sizeAddr);
905 InetAddress[] inetAddrs;
907 inetAddrs = InetAddress.getAllByName(hostname);
908 } catch(UnknownHostException e) {
909 return HOST_NOT_FOUND;
911 int count = min(size/4,inetAddrs.length);
912 for(int i=0;i<count;i++,addr+=4) {
913 byte[] b = inetAddrs[i].getAddress();
916 memWrite(sizeAddr,count*4);
920 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
921 SocketFD fd = getSocketFD(fdn);
927 if(len != 4) return -EINVAL;
928 int val = memRead(valaddr);
929 if(val != 0) fd.options |= name;
930 else fd.options &= ~name;
935 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
939 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
944 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
945 SocketFD fd = getSocketFD(fdn);
951 int len = memRead(lenaddr);
952 if(len < 4) return -EINVAL;
953 int val = (fd.options & name) != 0 ? 1 : 0;
954 memWrite(valaddr,val);
959 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
963 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
968 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
969 SocketFD fd = getSocketFD(fdn);
971 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
972 int word1 = memRead(addr);
973 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
974 int port = word1 & 0xffff;
975 InetAddress inetAddr = null;
976 if(memRead(addr+4) != 0) {
977 byte[] ip = new byte[4];
981 inetAddr = Platform.inetAddressFromBytes(ip);
982 } catch(UnknownHostException e) {
983 return -EADDRNOTAVAIL;
988 case SocketFD.TYPE_STREAM: {
989 fd.bindAddr = inetAddr;
993 case SocketFD.TYPE_DGRAM: {
994 if(fd.ds != null) fd.ds.close();
996 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
997 } catch(IOException e) {
1003 throw new Error("should never happen");
1007 private int sys_listen(int fdn, int backlog) throws ErrnoException {
1008 SocketFD fd = getSocketFD(fdn);
1009 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1010 if(fd.ss != null || fd.s != null) return -EISCONN;
1011 if(fd.bindPort < 0) return -EOPNOTSUPP;
1014 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
1015 fd.flags |= SocketFD.LISTEN;
1017 } catch(IOException e) {
1023 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
1024 SocketFD fd = getSocketFD(fdn);
1025 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1026 if(!fd.listen()) return -EOPNOTSUPP;
1028 int size = memRead(lenaddr);
1030 ServerSocket s = fd.ss;
1033 client = s.accept();
1034 } catch(IOException e) {
1039 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
1040 byte[] b = client.getInetAddress().getAddress();
1041 copyout(b,addr+4,4);
1042 memWrite(lenaddr,8);
1045 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
1046 clientFD.s = client;
1048 clientFD.is = client.getInputStream();
1049 clientFD.os = client.getOutputStream();
1050 } catch(IOException e) {
1053 int n = addFD(clientFD);
1054 if(n == -1) { clientFD.close(); return -ENFILE; }
1058 private int sys_shutdown(int fdn, int how) throws ErrnoException {
1059 SocketFD fd = getSocketFD(fdn);
1060 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
1061 if(fd.s == null) return -ENOTCONN;
1066 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
1067 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
1068 } catch(IOException e) {
1075 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
1076 SocketFD fd = getSocketFD(fdn);
1077 if(flags != 0) throw new ErrnoException(EINVAL);
1079 int word1 = memRead(destAddr);
1080 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1081 int port = word1 & 0xffff;
1082 InetAddress inetAddr;
1083 byte[] ip = new byte[4];
1084 copyin(destAddr+4,ip,4);
1086 inetAddr = Platform.inetAddressFromBytes(ip);
1087 } catch(UnknownHostException e) {
1088 return -EADDRNOTAVAIL;
1091 count = Math.min(count,MAX_CHUNK);
1092 byte[] buf = byteBuf(count);
1093 copyin(addr,buf,count);
1095 return fd.sendto(buf,0,count,inetAddr,port);
1096 } catch(ErrnoException e) {
1097 if(e.errno == EPIPE) exit(128+13,true);
1102 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
1103 SocketFD fd = getSocketFD(fdn);
1104 if(flags != 0) throw new ErrnoException(EINVAL);
1106 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
1107 int[] port = sourceAddr == 0 ? null : new int[1];
1109 count = Math.min(count,MAX_CHUNK);
1110 byte[] buf = byteBuf(count);
1111 int n = fd.recvfrom(buf,0,count,inetAddr,port);
1112 copyout(buf,addr,n);
1114 if(sourceAddr != 0) {
1115 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
1116 byte[] ip = inetAddr[0].getAddress();
1117 copyout(ip,sourceAddr+4,4);
1123 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
1127 private static String hostName() {
1129 return InetAddress.getLocalHost().getHostName();
1130 } catch(UnknownHostException e) {
1135 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
1136 if(newp != 0) return -EPERM;
1137 if(namelen == 0) return -ENOENT;
1138 if(oldp == 0) return 0;
1141 switch(memRead(nameaddr)) {
1143 if(namelen != 2) break;
1144 switch(memRead(nameaddr+4)) {
1145 case KERN_OSTYPE: o = "NestedVM"; break;
1146 case KERN_HOSTNAME: o = hostName(); break;
1147 case KERN_OSRELEASE: o = VERSION; break;
1148 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
1152 if(namelen != 2) break;
1153 switch(memRead(nameaddr+4)) {
1154 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
1158 if(o == null) return -ENOENT;
1159 int len = memRead(oldlenaddr);
1160 if(o instanceof String) {
1161 byte[] b = getNullTerminatedBytes((String)o);
1162 if(len < b.length) return -ENOMEM;
1164 copyout(b,oldp,len);
1165 memWrite(oldlenaddr,len);
1166 } else if(o instanceof Integer) {
1167 if(len < 4) return -ENOMEM;
1168 memWrite(oldp,((Integer)o).intValue());
1170 throw new Error("should never happen");
1175 public static final class GlobalState {
1176 Hashtable execCache = new Hashtable();
1178 final UnixRuntime[] tasks;
1181 private MP[] mps = new MP[0];
1184 public GlobalState() { this(255); }
1185 public GlobalState(int maxProcs) { this(maxProcs,true); }
1186 public GlobalState(int maxProcs, boolean defaultMounts) {
1187 tasks = new UnixRuntime[maxProcs+1];
1189 addMount("/",new HostFS());
1190 addMount("/dev",new DevFS());
1194 static class MP implements Sort.Comparable {
1195 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1198 public int compareTo(Object o) {
1199 if(!(o instanceof MP)) return 1;
1200 return -path.compareTo(((MP)o).path);
1204 public synchronized FS getMount(String path) {
1205 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1206 if(path.equals("/")) return root;
1207 path = path.substring(1);
1208 for(int i=0;i<mps.length;i++)
1209 if(mps[i].path.equals(path)) return mps[i].fs;
1213 public synchronized void addMount(String path, FS fs) {
1214 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1215 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1217 if(fs.owner != null) fs.owner.removeMount(fs);
1220 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1221 path = path.substring(1);
1222 int oldLength = mps.length;
1223 MP[] newMPS = new MP[oldLength + 1];
1224 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1225 newMPS[oldLength] = new MP(path,fs);
1229 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1230 fs.devno = highdevno + 2;
1233 public synchronized void removeMount(FS fs) {
1234 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1235 throw new IllegalArgumentException("mount point doesn't exist");
1238 public synchronized void removeMount(String path) {
1239 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1240 if(path.equals("/")) {
1243 path = path.substring(1);
1245 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1246 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1251 private void removeMount(int index) {
1252 if(index == -1) { root.owner = null; root = null; return; }
1253 MP[] newMPS = new MP[mps.length - 1];
1254 System.arraycopy(mps,0,newMPS,0,index);
1255 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1259 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1260 int pl = normalizedPath.length();
1263 synchronized(this) { list = mps; }
1264 for(int i=0;i<list.length;i++) {
1266 int mpl = mp.path.length();
1267 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1268 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1271 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1274 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1275 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1276 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1277 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1278 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1280 private static class CacheEnt {
1281 public final long time;
1282 public final long size;
1283 public final Object o;
1284 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1288 public abstract static class FS {
1289 static final int OPEN = 1;
1290 static final int STAT = 2;
1291 static final int LSTAT = 3;
1292 static final int MKDIR = 4;
1293 static final int UNLINK = 5;
1298 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1300 case OPEN: return open(r,path,arg1,arg2);
1301 case STAT: return stat(r,path);
1302 case LSTAT: return lstat(r,path);
1303 case MKDIR: mkdir(r,path,arg1); return null;
1304 case UNLINK: unlink(r,path); return null;
1305 default: throw new Error("should never happen");
1309 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1311 // If this returns null it'll be truned into an ENOENT
1312 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1313 // If this returns null it'll be turned into an ENOENT
1314 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1315 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1316 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1319 // chroot support should go in here if it is ever implemented chroot support in here
1320 private String normalizePath(String path) {
1321 boolean absolute = path.startsWith("/");
1322 int cwdl = cwd.length();
1324 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1325 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1326 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1328 char[] in = new char[path.length()+1];
1329 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1330 path.getChars(0,path.length(),in,0);
1334 do { inp++; } while(in[inp] == '/');
1335 } else if(cwdl != 0) {
1336 cwd.getChars(0,cwdl,out,0);
1340 while(in[inp] != 0) {
1342 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1343 if(in[inp] == '\0') break;
1344 while(in[inp] == '/') inp++;
1348 if(in[inp] == '\0') break;
1349 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1351 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1352 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1353 // Just read a /..{$,/}
1355 if(outp > 0) outp--;
1356 while(outp > 0 && out[outp] != '/') outp--;
1357 //System.err.println("After ..: " + new String(out,0,outp));
1360 // Just read a /.[^.] or /..[^/$]
1365 if(outp > 0 && out[outp-1] == '/') outp--;
1366 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1367 int outStart = out[0] == '/' ? 1 : 0;
1368 return new String(out,outStart,outp - outStart);
1371 FStat hostFStat(final File f, Object data) {
1374 FileInputStream fis = new FileInputStream(f);
1375 switch(fis.read()) {
1376 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1377 case '#': e = fis.read() == '!';
1380 } catch(IOException e2) { }
1381 HostFS fs = (HostFS) data;
1382 final int inode = fs.inodes.get(f.getAbsolutePath());
1383 final int devno = fs.devno;
1384 return new HostFStat(f,e) {
1385 public int inode() { return inode; }
1386 public int dev() { return devno; }
1390 FD hostFSDirFD(File f, Object _fs) {
1391 HostFS fs = (HostFS) _fs;
1392 return fs.new HostDirFD(f);
1395 public static class HostFS extends FS {
1396 InodeCache inodes = new InodeCache(4000);
1397 protected File root;
1398 public File getRoot() { return root; }
1400 static File hostRootDir() {
1401 if(Platform.getProperty("nestedvm.root") != null) {
1402 File f = new File(Platform.getProperty("nestedvm.root"));
1403 if(f.isDirectory()) return f;
1404 // fall through to case below
1406 String cwd = Platform.getProperty("user.dir");
1407 File f = new File(cwd != null ? cwd : ".");
1408 if(!f.exists()) throw new Error("Couldn't get File for cwd");
1409 f = new File(f.getAbsolutePath());
1410 while(f.getParent() != null) f = new File(f.getParent());
1411 // This works around a bug in some versions of ClassPath
1412 if(f.getPath().length() == 0) f = new File("/");
1416 private File hostFile(String path) {
1417 char sep = File.separatorChar;
1419 char buf[] = path.toCharArray();
1420 for(int i=0;i<buf.length;i++) {
1422 if(c == '/') buf[i] = sep;
1423 else if(c == sep) buf[i] = '/';
1425 path = new String(buf);
1427 return new File(root,path);
1430 public HostFS() { this(hostRootDir()); }
1431 public HostFS(String root) { this(new File(root)); }
1432 public HostFS(File root) { this.root = root; }
1435 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1436 final File f = hostFile(path);
1437 return r.hostFSOpen(f,flags,mode,this);
1440 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1441 File f = hostFile(path);
1442 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1443 if(!f.exists()) throw new ErrnoException(ENOENT);
1444 if(!f.delete()) throw new ErrnoException(EPERM);
1447 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1448 File f = hostFile(path);
1449 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1450 if(!f.exists()) return null;
1451 return r.hostFStat(f,this);
1454 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1455 File f = hostFile(path);
1456 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1457 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1458 if(f.exists()) throw new ErrnoException(ENOTDIR);
1459 File parent = getParentFile(f);
1460 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1461 if(!f.mkdir()) throw new ErrnoException(EIO);
1464 private static File getParentFile(File f) {
1465 String p = f.getParent();
1466 return p == null ? null : new File(p);
1469 public class HostDirFD extends DirFD {
1470 private final File f;
1471 private final File[] children;
1472 public HostDirFD(File f) {
1474 String[] l = f.list();
1475 children = new File[l.length];
1476 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1478 public int size() { return children.length; }
1479 public String name(int n) { return children[n].getName(); }
1480 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1481 public int parentInode() {
1482 File parent = getParentFile(f);
1483 // HACK: myInode() isn't really correct if we're not the root
1484 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1486 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1487 public int myDev() { return devno; }
1491 private static void putInt(byte[] buf, int off, int n) {
1492 buf[off+0] = (byte)((n>>>24)&0xff);
1493 buf[off+1] = (byte)((n>>>16)&0xff);
1494 buf[off+2] = (byte)((n>>> 8)&0xff);
1495 buf[off+3] = (byte)((n>>> 0)&0xff);
1498 public static abstract class DirFD extends FD {
1499 private int pos = -2;
1501 protected abstract int size();
1502 protected abstract String name(int n);
1503 protected abstract int inode(int n);
1504 protected abstract int myDev();
1505 protected abstract int parentInode();
1506 protected abstract int myInode();
1507 public int flags() { return O_RDONLY; }
1509 public int getdents(byte[] buf, int off, int len) {
1513 OUTER: for(;len > 0 && pos < size();pos++){
1517 ino = pos == -1 ? parentInode() : myInode();
1518 if(ino == -1) continue;
1519 reclen = 9 + (pos == -1 ? 2 : 1);
1520 if(reclen > len) break OUTER;
1522 if(pos == -1) buf[off+9] = '.';
1525 String f = name(pos);
1526 byte[] fb = getBytes(f);
1527 reclen = fb.length + 9;
1528 if(reclen > len) break OUTER;
1530 System.arraycopy(fb,0,buf,off+8,fb.length);
1533 buf[off+reclen-1] = 0; // null terminate
1534 reclen = (reclen + 3) & ~3; // add padding
1535 putInt(buf,off,reclen);
1536 putInt(buf,off+4,ino);
1543 protected FStat _fstat() {
1544 return new FStat() {
1545 public int type() { return S_IFDIR; }
1546 public int inode() { return myInode(); }
1547 public int dev() { return myDev(); }
1552 public static class DevFS extends FS {
1553 private static final int ROOT_INODE = 1;
1554 private static final int NULL_INODE = 2;
1555 private static final int ZERO_INODE = 3;
1556 private static final int FD_INODE = 4;
1557 private static final int FD_INODES = 32;
1559 private abstract class DevFStat extends FStat {
1560 public int dev() { return devno; }
1561 public int mode() { return 0666; }
1562 public int type() { return S_IFCHR; }
1563 public int nlink() { return 1; }
1564 public abstract int inode();
1567 private abstract class DevDirFD extends DirFD {
1568 public int myDev() { return devno; }
1571 private FD devZeroFD = new FD() {
1572 public int read(byte[] a, int off, int length) {
1573 /*Arrays.fill(a,off,off+length,(byte)0);*/
1574 for(int i=off;i<off+length;i++) a[i] = 0;
1577 public int write(byte[] a, int off, int length) { return length; }
1578 public int seek(int n, int whence) { return 0; }
1579 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1580 public int flags() { return O_RDWR; }
1582 private FD devNullFD = new FD() {
1583 public int read(byte[] a, int off, int length) { return 0; }
1584 public int write(byte[] a, int off, int length) { return length; }
1585 public int seek(int n, int whence) { return 0; }
1586 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1587 public int flags() { return O_RDWR; }
1590 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1591 if(path.equals("null")) return devNullFD;
1592 if(path.equals("zero")) return devZeroFD;
1593 if(path.startsWith("fd/")) {
1596 n = Integer.parseInt(path.substring(4));
1597 } catch(NumberFormatException e) {
1600 if(n < 0 || n >= OPEN_MAX) return null;
1601 if(r.fds[n] == null) return null;
1602 return r.fds[n].dup();
1604 if(path.equals("fd")) {
1606 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1607 final int[] files = new int[count];
1609 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1610 return new DevDirFD() {
1611 public int myInode() { return FD_INODE; }
1612 public int parentInode() { return ROOT_INODE; }
1613 public int inode(int n) { return FD_INODES + n; }
1614 public String name(int n) { return Integer.toString(files[n]); }
1615 public int size() { return files.length; }
1618 if(path.equals("")) {
1619 return new DevDirFD() {
1620 public int myInode() { return ROOT_INODE; }
1621 // HACK: We don't have any clean way to get the parent inode
1622 public int parentInode() { return ROOT_INODE; }
1623 public int inode(int n) {
1625 case 0: return NULL_INODE;
1626 case 1: return ZERO_INODE;
1627 case 2: return FD_INODE;
1632 public String name(int n) {
1634 case 0: return "null";
1635 case 1: return "zero";
1636 case 2: return "fd";
1637 default: return null;
1640 public int size() { return 3; }
1646 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1647 if(path.equals("null")) return devNullFD.fstat();
1648 if(path.equals("zero")) return devZeroFD.fstat();
1649 if(path.startsWith("fd/")) {
1652 n = Integer.parseInt(path.substring(3));
1653 } catch(NumberFormatException e) {
1656 if(n < 0 || n >= OPEN_MAX) return null;
1657 if(r.fds[n] == null) return null;
1658 return r.fds[n].fstat();
1660 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; }};
1661 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; }};
1665 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1666 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }