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.*;
11 import java.lang.reflect.*; // For lazily linked RuntimeCompiler
15 public abstract class UnixRuntime extends Runtime implements Cloneable {
16 /** The pid of this "process" */
18 private UnixRuntime parent;
19 public final int getPid() { return pid; }
21 private static final GlobalState defaultGS = new GlobalState();
22 private GlobalState gs;
23 public void setGlobalState(GlobalState gs) {
24 if(state != STOPPED) throw new IllegalStateException("can't change GlobalState when running");
25 if(gs == null) throw new NullPointerException("gs is null");
29 /** proceses' current working directory - absolute path WITHOUT leading slash
30 "" = root, "bin" = /bin "usr/bin" = /usr/bin */
33 /** The runtime that should be run next when in state == EXECED */
34 private UnixRuntime execedRuntime;
36 private Object children; // used only for synchronizatin
37 private Vector activeChildren;
38 private Vector exitedChildren;
40 protected UnixRuntime(int pageSize, int totalPages) { this(pageSize,totalPages,false); }
41 protected UnixRuntime(int pageSize, int totalPages, boolean exec) {
42 super(pageSize,totalPages,exec);
46 String userdir = Platform.getProperty("user.dir");
47 cwd = userdir == null ? null : gs.mapHostPath(userdir);
48 if(cwd == null) cwd = "/";
49 cwd = cwd.substring(1);
53 private static String posixTZ() {
54 StringBuffer sb = new StringBuffer();
55 TimeZone zone = TimeZone.getDefault();
56 int off = zone.getRawOffset() / 1000;
57 sb.append(Platform.timeZoneGetDisplayName(zone,false,false));
58 if(off > 0) sb.append("-");
60 sb.append(off/3600); off = off%3600;
61 if(off > 0) sb.append(":").append(off/60); off=off%60;
62 if(off > 0) sb.append(":").append(off);
63 if(zone.useDaylightTime())
64 sb.append(Platform.timeZoneGetDisplayName(zone,true,false));
68 private static boolean envHas(String key,String[] environ) {
69 for(int i=0;i<environ.length;i++)
70 if(environ[i]!=null && environ[i].startsWith(key + "=")) return true;
74 String[] createEnv(String[] extra) {
75 String[] defaults = new String[7];
77 if(extra == null) extra = new String[0];
79 if(!envHas("USER",extra) && Platform.getProperty("user.name") != null)
80 defaults[n++] = "USER=" + Platform.getProperty("user.name");
81 if(!envHas("HOME",extra) && (tmp=Platform.getProperty("user.home")) != null && (tmp=gs.mapHostPath(tmp)) != null)
82 defaults[n++] = "HOME=" + tmp;
83 if(!envHas("TMPDIR",extra) && (tmp=Platform.getProperty("java.io.tmpdir")) != null && (tmp=gs.mapHostPath(tmp)) != null)
84 defaults[n++] = "TMPDIR=" + tmp;
85 if(!envHas("SHELL",extra)) defaults[n++] = "SHELL=/bin/sh";
86 if(!envHas("TERM",extra) && !win32Hacks) defaults[n++] = "TERM=vt100";
87 if(!envHas("TZ",extra)) defaults[n++] = "TZ=" + posixTZ();
88 if(!envHas("PATH",extra)) defaults[n++] = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin";
89 String[] env = new String[extra.length+n];
90 for(int i=0;i<n;i++) env[i] = defaults[i];
91 for(int i=0;i<extra.length;i++) env[n++] = extra[i];
95 private static class ProcessTableFullExn extends RuntimeException { }
98 UnixRuntime[] tasks = gs.tasks;
101 UnixRuntime prev = tasks[pid];
102 if(prev == null || prev == this || prev.pid != pid || prev.parent != parent)
103 throw new Error("should never happen");
104 synchronized(parent.children) {
105 int i = parent.activeChildren.indexOf(prev);
106 if(i == -1) throw new Error("should never happen");
107 parent.activeChildren.setElementAt(this,i);
111 int nextPID = gs.nextPID;
112 for(int i=nextPID;i<tasks.length;i++) if(tasks[i] == null) { newpid = i; break; }
113 if(newpid == -1) for(int i=1;i<nextPID;i++) if(tasks[i] == null) { newpid = i; break; }
114 if(newpid == -1) throw new ProcessTableFullExn();
116 gs.nextPID = newpid + 1;
122 int _syscall(int syscall, int a, int b, int c, int d, int e, int f) throws ErrnoException, FaultException {
124 case SYS_kill: return sys_kill(a,b);
125 case SYS_fork: return sys_fork();
126 case SYS_pipe: return sys_pipe(a);
127 case SYS_dup2: return sys_dup2(a,b);
128 case SYS_dup: return sys_dup(a);
129 case SYS_waitpid: return sys_waitpid(a,b,c);
130 case SYS_stat: return sys_stat(a,b);
131 case SYS_lstat: return sys_lstat(a,b);
132 case SYS_mkdir: return sys_mkdir(a,b);
133 case SYS_getcwd: return sys_getcwd(a,b);
134 case SYS_chdir: return sys_chdir(a);
135 case SYS_exec: return sys_exec(a,b,c);
136 case SYS_getdents: return sys_getdents(a,b,c,d);
137 case SYS_unlink: return sys_unlink(a);
138 case SYS_getppid: return sys_getppid();
139 case SYS_socket: return sys_socket(a,b,c);
140 case SYS_connect: return sys_connect(a,b,c);
141 case SYS_resolve_hostname: return sys_resolve_hostname(a,b,c);
142 case SYS_setsockopt: return sys_setsockopt(a,b,c,d,e);
143 case SYS_getsockopt: return sys_getsockopt(a,b,c,d,e);
144 case SYS_bind: return sys_bind(a,b,c);
145 case SYS_listen: return sys_listen(a,b);
146 case SYS_accept: return sys_accept(a,b,c);
147 case SYS_shutdown: return sys_shutdown(a,b);
148 case SYS_sysctl: return sys_sysctl(a,b,c,d,e,f);
149 case SYS_sendto: return sys_sendto(a,b,c,d,e,f);
150 case SYS_recvfrom: return sys_recvfrom(a,b,c,d,e,f);
151 case SYS_select: return sys_select(a,b,c,d,e);
152 case SYS_access: return sys_access(a,b);
153 case SYS_realpath: return sys_realpath(a,b);
154 case SYS_chown: return sys_chown(a,b,c);
155 case SYS_lchown: return sys_chown(a,b,c);
156 case SYS_fchown: return sys_fchown(a,b,c);
157 case SYS_chmod: return sys_chmod(a,b,c);
158 case SYS_fchmod: return sys_fchmod(a,b,c);
159 case SYS_umask: return sys_umask(a);
161 default: return super._syscall(syscall,a,b,c,d,e,f);
165 FD _open(String path, int flags, int mode) throws ErrnoException {
166 return gs.open(this,normalizePath(path),flags,mode);
169 private int sys_getppid() {
170 return parent == null ? 1 : parent.pid;
173 private int sys_chown(int fileAddr, int uid, int gid) {
176 private int sys_lchown(int fileAddr, int uid, int gid) {
179 private int sys_fchown(int fd, int uid, int gid) {
182 private int sys_chmod(int fileAddr, int uid, int gid) {
185 private int sys_fchmod(int fd, int uid, int gid) {
188 private int sys_umask(int mask) {
192 private int sys_access(int cstring, int mode) throws ErrnoException, ReadFaultException {
193 // FEATURE: sys_access
194 return gs.stat(this,cstring(cstring)) == null ? -ENOENT : 0;
197 private int sys_realpath(int inAddr, int outAddr) throws FaultException {
198 String s = normalizePath(cstring(inAddr));
199 byte[] b = getNullTerminatedBytes(s);
200 if(b.length > PATH_MAX) return -ERANGE;
201 copyout(b,outAddr,b.length);
205 // FEATURE: Signal handling
206 // check flag only on backwards jumps to basic blocks without compulsatory checks
207 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
209 /** The kill syscall.
210 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
211 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
212 Anything else terminates the process. */
213 private int sys_kill(int pid, int signal) {
214 // This will only be called by raise() in newlib to invoke the default handler
215 // We don't have to worry about actually delivering the signal
216 if(pid != pid) return -ESRCH;
217 if(signal < 0 || signal >= 32) return -EINVAL;
230 exit(128+signal, true);
235 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
236 final int WNOHANG = 1;
237 if((options & ~(WNOHANG)) != 0) return -EINVAL;
238 if(pid == 0 || pid < -1) {
239 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
242 boolean blocking = (options&WNOHANG)==0;
244 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
245 if(children == null) return blocking ? -ECHILD : 0;
247 UnixRuntime done = null;
249 synchronized(children) {
252 if(exitedChildren.size() > 0) {
253 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
254 exitedChildren.removeElementAt(exitedChildren.size() - 1);
257 if(pid >= gs.tasks.length) return -ECHILD;
258 UnixRuntime t = gs.tasks[pid];
259 if(t.parent != this) return -ECHILD;
260 if(t.state == EXITED) {
261 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
265 // process group stuff, EINVAL returned above
266 throw new Error("should never happen");
269 if(!blocking) return 0;
270 try { children.wait(); } catch(InterruptedException e) {}
271 //System.err.println("waitpid woke up: " + exitedChildren.size());
273 gs.tasks[done.pid] = null;
278 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
284 if(children != null) synchronized(children) {
285 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
286 UnixRuntime child = (UnixRuntime) e.nextElement();
287 gs.tasks[child.pid] = null;
289 exitedChildren.removeAllElements();
290 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
291 UnixRuntime child = (UnixRuntime) e.nextElement();
294 activeChildren.removeAllElements();
297 UnixRuntime _parent = parent;
298 if(_parent == null) {
299 gs.tasks[pid] = null;
301 synchronized(_parent.children) {
303 gs.tasks[pid] = null;
305 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
306 parent.exitedChildren.addElement(this);
307 parent.children.notify();
313 protected Object clone() throws CloneNotSupportedException {
314 UnixRuntime r = (UnixRuntime) super.clone();
318 r.activeChildren = r.exitedChildren = null;
322 private int sys_fork() {
326 r = (UnixRuntime) clone();
327 } catch(Exception e) {
336 } catch(ProcessTableFullExn e) {
340 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
341 if(children == null) {
342 children = new Object();
343 activeChildren = new Vector();
344 exitedChildren = new Vector();
346 activeChildren.addElement(r);
348 CPUState state = new CPUState();
350 state.r[V0] = 0; // return 0 to child
351 state.pc += 4; // skip over syscall instruction
352 r.setCPUState(state);
355 new ForkedProcess(r);
360 public static final class ForkedProcess extends Thread {
361 private final UnixRuntime initial;
362 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
363 public void run() { UnixRuntime.executeAndExec(initial); }
366 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
367 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
369 public static int executeAndExec(UnixRuntime r) {
372 if(r.execute()) break;
373 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
375 if(r.state != EXECED) return r.exitStatus();
380 private String[] readStringArray(int addr) throws ReadFaultException {
382 for(int p=addr;memRead(p) != 0;p+=4) count++;
383 String[] a = new String[count];
384 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
388 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
389 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
392 private final static Method runtimeCompilerCompile;
396 m = Class.forName("org.ibex.nestedvm.RuntimeCompiler").getMethod("compile",new Class[]{Seekable.class,String.class,String.class});
397 } catch(NoSuchMethodException e) {
399 } catch(ClassNotFoundException e) {
402 runtimeCompilerCompile = m;
405 public Class runtimeCompile(Seekable s, String sourceName) throws IOException {
406 if(runtimeCompilerCompile == null) {
407 if(STDERR_DIAG) System.err.println("WARNING: Exec attempted but RuntimeCompiler not found!");
412 return (Class) runtimeCompilerCompile.invoke(null,new Object[]{s,"unixruntime,maxinsnpermethod=256,lessconstants",sourceName});
413 } catch(IllegalAccessException e) {
416 } catch(InvocationTargetException e) {
417 Throwable t = e.getTargetException();
418 if(t instanceof IOException) throw (IOException) t;
419 if(t instanceof RuntimeException) throw (RuntimeException) t;
420 if(t instanceof Error) throw (Error) t;
421 if(STDERR_DIAG) t.printStackTrace();
426 private int exec(String path, String[] argv, String[] envp) throws ErrnoException {
427 if(argv.length == 0) argv = new String[]{""};
428 // HACK: Hideous hack to make a standalone busybox possible
429 if(path.equals("bin/busybox") && getClass().getName().endsWith("BusyBox"))
430 return execClass(getClass(),argv,envp);
432 // NOTE: For this little hack to work nestedvm.root MUST be "."
434 System.err.println("Execing normalized path: " + normalizedPath);
435 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
436 } catch(IOException e) { throw new Error(e); }*/
438 FStat fstat = gs.stat(this,path);
439 if(fstat == null) return -ENOENT;
440 GlobalState.CacheEnt ent = (GlobalState.CacheEnt) gs.execCache.get(path);
441 long mtime = fstat.mtime();
442 long size = fstat.size();
444 //System.err.println("Found cached entry for " + path);
445 if(ent.time ==mtime && ent.size == size) {
446 if(ent.o instanceof Class)
447 return execClass((Class) ent.o,argv,envp);
448 if(ent.o instanceof String[])
449 return execScript(path,(String[]) ent.o,argv,envp);
450 throw new Error("should never happen");
452 //System.err.println("Cache was out of date");
453 gs.execCache.remove(path);
456 FD fd = gs.open(this,path,RD_ONLY,0);
457 if(fd == null) throw new ErrnoException(ENOENT);
458 Seekable s = fd.seekable();
459 if(s == null) throw new ErrnoException(EACCES);
461 byte[] buf = new byte[4096];
464 int n = s.read(buf,0,buf.length);
465 if(n == -1) throw new ErrnoException(ENOEXEC);
468 case '\177': // possible ELF
469 if(n < 4) s.tryReadFully(buf,n,4-n);
470 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') return -ENOEXEC;
472 if(STDERR_DIAG) System.err.println("Running RuntimeCompiler for " + path);
473 Class c = runtimeCompile(s,path);
474 if(STDERR_DIAG) System.err.println("RuntimeCompiler finished for " + path);
475 if(c == null) throw new ErrnoException(ENOEXEC);
476 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
477 return execClass(c,argv,envp);
480 int n2 = s.read(buf,1,buf.length-1);
481 if(n2 == -1) return -ENOEXEC;
484 if(buf[1] != '!') return -ENOEXEC;
488 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
490 if(p == buf.length) break OUTER;
491 n = s.read(buf,p,buf.length-p);
494 for(;cmdStart<p;cmdStart++) if(buf[cmdStart]!=' ') break;
495 if(cmdStart == p) throw new ErrnoException(ENOEXEC);
496 int argStart = cmdStart;
497 for(;argStart<p;argStart++) if(buf[argStart] == ' ') break;
498 int cmdEnd = argStart;
499 while(argStart < p && buf[argStart] == ' ') argStart++;
500 String[] command = new String[] {
501 new String(buf,cmdStart,cmdEnd-cmdStart),
502 argStart < p ? new String(buf,argStart,p-argStart) : null
504 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
505 return execScript(path,command,argv,envp);
509 } catch(IOException e) {
516 public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
517 String[] newArgv = new String[argv.length-1 + (command[1] != null ? 3 : 2)];
518 int p = command[0].lastIndexOf('/');
519 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
520 newArgv[1] = "/" + path;
522 if(command[1] != null) newArgv[p++] = command[1];
523 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
524 if(p != newArgv.length) throw new Error("p != newArgv.length");
525 System.err.println("Execing: " + command[0]);
526 for(int i=0;i<newArgv.length;i++) System.err.println("execing [" + i + "] " + newArgv[i]);
527 return exec(command[0],newArgv,envp);
530 public int execClass(Class c,String[] argv, String[] envp) {
532 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
533 return exec(r,argv,envp);
534 } catch(Exception e) {
540 private int exec(UnixRuntime r, String[] argv, String[] envp) {
541 //System.err.println("Execing " + r);
542 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
544 r.closeOnExec = closeOnExec;
545 // make sure this doesn't get messed with these since we didn't copy them
563 private final byte[] pipebuf = new byte[PIPE_BUF*4];
565 private int writePos;
567 public final FD reader = new Reader();
568 public final FD writer = new Writer();
570 public class Reader extends FD {
571 protected FStat _fstat() { return new SocketFStat(); }
572 public int read(byte[] buf, int off, int len) throws ErrnoException {
573 if(len == 0) return 0;
574 synchronized(Pipe.this) {
575 while(writePos != -1 && readPos == writePos) {
576 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
578 if(writePos == -1) return 0; // eof
579 len = Math.min(len,writePos-readPos);
580 System.arraycopy(pipebuf,readPos,buf,off,len);
582 if(readPos == writePos) Pipe.this.notify();
586 public int flags() { return O_RDONLY; }
587 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
590 public class Writer extends FD {
591 protected FStat _fstat() { return new SocketFStat(); }
592 public int write(byte[] buf, int off, int len) throws ErrnoException {
593 if(len == 0) return 0;
594 synchronized(Pipe.this) {
595 if(readPos == -1) throw new ErrnoException(EPIPE);
596 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
597 // not enough space to atomicly write the data
598 while(readPos != -1 && readPos != writePos) {
599 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
601 if(readPos == -1) throw new ErrnoException(EPIPE);
602 readPos = writePos = 0;
604 len = Math.min(len,pipebuf.length - writePos);
605 System.arraycopy(buf,off,pipebuf,writePos,len);
606 if(readPos == writePos) Pipe.this.notify();
611 public int flags() { return O_WRONLY; }
612 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
616 private int sys_pipe(int addr) {
617 Pipe pipe = new Pipe();
619 int fd1 = addFD(pipe.reader);
620 if(fd1 < 0) return -ENFILE;
621 int fd2 = addFD(pipe.writer);
622 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
626 memWrite(addr+4,fd2);
627 } catch(FaultException e) {
635 private int sys_dup2(int oldd, int newd) {
636 if(oldd == newd) return 0;
637 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
638 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
639 if(fds[oldd] == null) return -EBADFD;
640 if(fds[newd] != null) fds[newd].close();
641 fds[newd] = fds[oldd].dup();
645 private int sys_dup(int oldd) {
646 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
647 if(fds[oldd] == null) return -EBADFD;
648 FD fd = fds[oldd].dup();
649 int newd = addFD(fd);
650 if(newd < 0) { fd.close(); return -ENFILE; }
654 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
655 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
656 if(s == null) return -ENOENT;
660 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
661 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
662 if(s == null) return -ENOENT;
666 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
667 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
671 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
672 gs.unlink(this,normalizePath(cstring(cstring)));
676 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
677 byte[] b = getBytes(cwd);
678 if(size == 0) return -EINVAL;
679 if(size < b.length+2) return -ERANGE;
681 copyout(b,addr+1,b.length);
682 memset(addr+b.length+1,0,1);
686 private int sys_chdir(int addr) throws ErrnoException, FaultException {
687 String path = normalizePath(cstring(addr));
688 FStat st = gs.stat(this,path);
689 if(st == null) return -ENOENT;
690 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
695 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
696 count = Math.min(count,MAX_CHUNK);
697 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
698 if(fds[fdn] == null) return -EBADFD;
699 byte[] buf = byteBuf(count);
700 int n = fds[fdn].getdents(buf,0,count);
705 static class SocketFD extends FD {
706 public static final int TYPE_STREAM = 0;
707 public static final int TYPE_DGRAM = 1;
708 public static final int LISTEN = 2;
709 public int type() { return flags & 1; }
710 public boolean listen() { return (flags & 2) != 0; }
719 InetAddress bindAddr;
721 InetAddress connectAddr;
722 int connectPort = -1;
728 private static final byte[] EMPTY = new byte[0];
729 public SocketFD(int type) {
731 if(type == TYPE_DGRAM)
732 dp = new DatagramPacket(EMPTY,0);
735 public void setOptions() {
737 if(s != null && type() == TYPE_STREAM && !listen()) {
738 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
740 } catch(SocketException e) {
741 if(STDERR_DIAG) e.printStackTrace();
745 public void _close() {
747 if(s != null) s.close();
748 if(ss != null) ss.close();
749 if(ds != null) ds.close();
750 } catch(IOException e) {
755 public int read(byte[] a, int off, int length) throws ErrnoException {
756 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
757 if(is == null) throw new ErrnoException(EPIPE);
759 int n = is.read(a,off,length);
760 return n < 0 ? 0 : n;
761 } catch(IOException e) {
762 throw new ErrnoException(EIO);
766 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
767 if(type() == TYPE_STREAM) return read(a,off,length);
769 if(off != 0) throw new IllegalArgumentException("off must be 0");
771 dp.setLength(length);
773 if(ds == null) ds = new DatagramSocket();
775 } catch(IOException e) {
776 if(STDERR_DIAG) e.printStackTrace();
777 throw new ErrnoException(EIO);
779 if(sockAddr != null) {
780 sockAddr[0] = dp.getAddress();
781 port[0] = dp.getPort();
783 return dp.getLength();
786 public int write(byte[] a, int off, int length) throws ErrnoException {
787 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
789 if(os == null) throw new ErrnoException(EPIPE);
791 os.write(a,off,length);
793 } catch(IOException e) {
794 throw new ErrnoException(EIO);
798 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
799 if(off != 0) throw new IllegalArgumentException("off must be 0");
800 if(type() == TYPE_STREAM) return write(a,off,length);
802 if(destAddr == null) {
803 destAddr = connectAddr;
804 destPort = connectPort;
806 if(destAddr == null) throw new ErrnoException(ENOTCONN);
809 dp.setAddress(destAddr);
810 dp.setPort(destPort);
812 dp.setLength(length);
815 if(ds == null) ds = new DatagramSocket();
817 } catch(IOException e) {
818 if(STDERR_DIAG) e.printStackTrace();
819 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
820 throw new ErrnoException(EIO);
822 return dp.getLength();
825 public int flags() { return O_RDWR; }
826 public FStat _fstat() { return new SocketFStat(); }
829 private int sys_socket(int domain, int type, int proto) {
830 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
831 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
834 private SocketFD getSocketFD(int fdn) throws ErrnoException {
835 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
836 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
837 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
839 return (SocketFD) fds[fdn];
842 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
843 SocketFD fd = getSocketFD(fdn);
845 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
846 int word1 = memRead(addr);
847 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
848 int port = word1 & 0xffff;
849 byte[] ip = new byte[4];
852 InetAddress inetAddr;
854 inetAddr = Platform.inetAddressFromBytes(ip);
855 } catch(UnknownHostException e) {
856 return -EADDRNOTAVAIL;
859 fd.connectAddr = inetAddr;
860 fd.connectPort = port;
864 case SocketFD.TYPE_STREAM: {
865 Socket s = new Socket(inetAddr,port);
868 fd.is = s.getInputStream();
869 fd.os = s.getOutputStream();
872 case SocketFD.TYPE_DGRAM:
875 throw new Error("should never happen");
877 } catch(IOException e) {
878 return -ECONNREFUSED;
884 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
885 String hostname = cstring(chostname);
886 int size = memRead(sizeAddr);
887 InetAddress[] inetAddrs;
889 inetAddrs = InetAddress.getAllByName(hostname);
890 } catch(UnknownHostException e) {
891 return HOST_NOT_FOUND;
893 int count = min(size/4,inetAddrs.length);
894 for(int i=0;i<count;i++,addr+=4) {
895 byte[] b = inetAddrs[i].getAddress();
898 memWrite(sizeAddr,count*4);
902 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
903 SocketFD fd = getSocketFD(fdn);
909 if(len != 4) return -EINVAL;
910 int val = memRead(valaddr);
911 if(val != 0) fd.options |= name;
912 else fd.options &= ~name;
917 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
921 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
926 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
927 SocketFD fd = getSocketFD(fdn);
933 int len = memRead(lenaddr);
934 if(len < 4) return -EINVAL;
935 int val = (fd.options & name) != 0 ? 1 : 0;
936 memWrite(valaddr,val);
941 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
945 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
950 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
951 SocketFD fd = getSocketFD(fdn);
953 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
954 int word1 = memRead(addr);
955 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
956 int port = word1 & 0xffff;
957 InetAddress inetAddr = null;
958 if(memRead(addr+4) != 0) {
959 byte[] ip = new byte[4];
963 inetAddr = Platform.inetAddressFromBytes(ip);
964 } catch(UnknownHostException e) {
965 return -EADDRNOTAVAIL;
970 case SocketFD.TYPE_STREAM: {
971 fd.bindAddr = inetAddr;
975 case SocketFD.TYPE_DGRAM: {
976 if(fd.ds != null) fd.ds.close();
978 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
979 } catch(IOException e) {
985 throw new Error("should never happen");
989 private int sys_listen(int fdn, int backlog) throws ErrnoException {
990 SocketFD fd = getSocketFD(fdn);
991 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
992 if(fd.ss != null || fd.s != null) return -EISCONN;
993 if(fd.bindPort < 0) return -EOPNOTSUPP;
996 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
997 fd.flags |= SocketFD.LISTEN;
999 } catch(IOException e) {
1005 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
1006 SocketFD fd = getSocketFD(fdn);
1007 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1008 if(!fd.listen()) return -EOPNOTSUPP;
1010 int size = memRead(lenaddr);
1012 ServerSocket s = fd.ss;
1015 client = s.accept();
1016 } catch(IOException e) {
1021 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
1022 byte[] b = client.getInetAddress().getAddress();
1023 copyout(b,addr+4,4);
1024 memWrite(lenaddr,8);
1027 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
1028 clientFD.s = client;
1030 clientFD.is = client.getInputStream();
1031 clientFD.os = client.getOutputStream();
1032 } catch(IOException e) {
1035 int n = addFD(clientFD);
1036 if(n == -1) { clientFD.close(); return -ENFILE; }
1040 private int sys_shutdown(int fdn, int how) throws ErrnoException {
1041 SocketFD fd = getSocketFD(fdn);
1042 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
1043 if(fd.s == null) return -ENOTCONN;
1048 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
1049 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
1050 } catch(IOException e) {
1057 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
1058 SocketFD fd = getSocketFD(fdn);
1059 if(flags != 0) throw new ErrnoException(EINVAL);
1061 int word1 = memRead(destAddr);
1062 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1063 int port = word1 & 0xffff;
1064 InetAddress inetAddr;
1065 byte[] ip = new byte[4];
1066 copyin(destAddr+4,ip,4);
1068 inetAddr = Platform.inetAddressFromBytes(ip);
1069 } catch(UnknownHostException e) {
1070 return -EADDRNOTAVAIL;
1073 count = Math.min(count,MAX_CHUNK);
1074 byte[] buf = byteBuf(count);
1075 copyin(addr,buf,count);
1077 return fd.sendto(buf,0,count,inetAddr,port);
1078 } catch(ErrnoException e) {
1079 if(e.errno == EPIPE) exit(128+13,true);
1084 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
1085 SocketFD fd = getSocketFD(fdn);
1086 if(flags != 0) throw new ErrnoException(EINVAL);
1088 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
1089 int[] port = sourceAddr == 0 ? null : new int[1];
1091 count = Math.min(count,MAX_CHUNK);
1092 byte[] buf = byteBuf(count);
1093 int n = fd.recvfrom(buf,0,count,inetAddr,port);
1094 copyout(buf,addr,n);
1096 if(sourceAddr != 0) {
1097 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
1098 byte[] ip = inetAddr[0].getAddress();
1099 copyout(ip,sourceAddr+4,4);
1105 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
1109 private static String hostName() {
1111 return InetAddress.getLocalHost().getHostName();
1112 } catch(UnknownHostException e) {
1117 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
1118 if(newp != 0) return -EPERM;
1119 if(namelen == 0) return -ENOENT;
1120 if(oldp == 0) return 0;
1123 switch(memRead(nameaddr)) {
1125 if(namelen != 2) break;
1126 switch(memRead(nameaddr+4)) {
1127 case KERN_OSTYPE: o = "NestedVM"; break;
1128 case KERN_HOSTNAME: o = hostName(); break;
1129 case KERN_OSRELEASE: o = VERSION; break;
1130 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
1134 if(namelen != 2) break;
1135 switch(memRead(nameaddr+4)) {
1136 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
1140 if(o == null) return -ENOENT;
1141 int len = memRead(oldlenaddr);
1142 if(o instanceof String) {
1143 byte[] b = getNullTerminatedBytes((String)o);
1144 if(len < b.length) return -ENOMEM;
1146 copyout(b,oldp,len);
1147 memWrite(oldlenaddr,len);
1148 } else if(o instanceof Integer) {
1149 if(len < 4) return -ENOMEM;
1150 memWrite(oldp,((Integer)o).intValue());
1152 throw new Error("should never happen");
1157 public static final class GlobalState {
1158 Hashtable execCache = new Hashtable();
1160 final UnixRuntime[] tasks;
1163 private MP[] mps = new MP[0];
1166 public GlobalState() { this(255); }
1167 public GlobalState(int maxProcs) { this(maxProcs,true); }
1168 public GlobalState(int maxProcs, boolean defaultMounts) {
1169 tasks = new UnixRuntime[maxProcs+1];
1172 if(Platform.getProperty("nestedvm.root") != null) {
1173 root = new File(Platform.getProperty("nestedvm.root"));
1174 if(!root.isDirectory()) throw new IllegalArgumentException("nestedvm.root is not a directory");
1176 String cwd = Platform.getProperty("user.dir");
1177 root = Platform.getRoot(new File(cwd != null ? cwd : "."));
1180 addMount("/",new HostFS(root));
1182 if(Platform.getProperty("nestedvm.root") == null) {
1183 File[] roots = Platform.listRoots();
1184 for(int i=0;i<roots.length;i++) {
1185 String name = roots[i].getPath();
1186 if(name.endsWith(File.separator))
1187 name = name.substring(0,name.length()-1);
1188 if(name.length() == 0 || name.indexOf('/') != -1) continue;
1189 addMount("/" + name.toLowerCase(),new HostFS(roots[i]));
1193 addMount("/dev",new DevFS());
1194 addMount("/resource",new ResourceFS());
1198 public String mapHostPath(String s) { return mapHostPath(new File(s)); }
1199 public String mapHostPath(File f) {
1202 synchronized(this) { mps = this.mps; root = this.root; }
1203 if(!f.isAbsolute()) f = new File(f.getAbsolutePath());
1204 for(int i=mps.length;i>=0;i--) {
1205 FS fs = i == mps.length ? root : mps[i].fs;
1206 String path = i == mps.length ? "" : mps[i].path;
1207 if(!(fs instanceof HostFS)) continue;
1208 File fsroot = ((HostFS)fs).getRoot();
1209 if(!fsroot.isAbsolute()) fsroot = new File(fsroot.getAbsolutePath());
1210 if(f.getPath().startsWith(fsroot.getPath())) {
1211 char sep = File.separatorChar;
1212 String child = f.getPath().substring(fsroot.getPath().length());
1214 char[] child_ = child.toCharArray();
1215 for(int j=0;j<child_.length;j++) {
1216 if(child_[j] == '/') child_[j] = sep;
1217 else if(child_[j] == sep) child_[j] = '/';
1219 child = new String(child_);
1221 String mapped = "/" + (path.length()==0?"":path+"/") + child;
1228 static class MP implements Sort.Comparable {
1229 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1232 public int compareTo(Object o) {
1233 if(!(o instanceof MP)) return 1;
1234 return -path.compareTo(((MP)o).path);
1238 public synchronized FS getMount(String path) {
1239 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1240 if(path.equals("/")) return root;
1241 path = path.substring(1);
1242 for(int i=0;i<mps.length;i++)
1243 if(mps[i].path.equals(path)) return mps[i].fs;
1247 public synchronized void addMount(String path, FS fs) {
1248 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1249 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1251 if(fs.owner != null) fs.owner.removeMount(fs);
1254 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1255 path = path.substring(1);
1256 int oldLength = mps.length;
1257 MP[] newMPS = new MP[oldLength + 1];
1258 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1259 newMPS[oldLength] = new MP(path,fs);
1263 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1264 fs.devno = highdevno + 2;
1267 public synchronized void removeMount(FS fs) {
1268 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1269 throw new IllegalArgumentException("mount point doesn't exist");
1272 public synchronized void removeMount(String path) {
1273 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1274 if(path.equals("/")) {
1277 path = path.substring(1);
1279 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1280 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1285 private void removeMount(int index) {
1286 if(index == -1) { root.owner = null; root = null; return; }
1287 MP[] newMPS = new MP[mps.length - 1];
1288 System.arraycopy(mps,0,newMPS,0,index);
1289 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1293 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1294 int pl = normalizedPath.length();
1297 synchronized(this) { list = mps; }
1298 for(int i=0;i<list.length;i++) {
1300 int mpl = mp.path.length();
1301 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1302 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1305 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1308 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1309 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1310 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1311 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1312 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1314 private static class CacheEnt {
1315 public final long time;
1316 public final long size;
1317 public final Object o;
1318 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1322 public abstract static class FS {
1323 static final int OPEN = 1;
1324 static final int STAT = 2;
1325 static final int LSTAT = 3;
1326 static final int MKDIR = 4;
1327 static final int UNLINK = 5;
1332 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1334 case OPEN: return open(r,path,arg1,arg2);
1335 case STAT: return stat(r,path);
1336 case LSTAT: return lstat(r,path);
1337 case MKDIR: mkdir(r,path,arg1); return null;
1338 case UNLINK: unlink(r,path); return null;
1339 default: throw new Error("should never happen");
1343 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1345 // If this returns null it'll be truned into an ENOENT
1346 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1347 // If this returns null it'll be turned into an ENOENT
1348 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1349 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1350 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1353 // chroot support should go in here if it is ever implemented
1354 private String normalizePath(String path) {
1355 boolean absolute = path.startsWith("/");
1356 int cwdl = cwd.length();
1358 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1359 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1360 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1362 char[] in = new char[path.length()+1];
1363 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1364 path.getChars(0,path.length(),in,0);
1368 do { inp++; } while(in[inp] == '/');
1369 } else if(cwdl != 0) {
1370 cwd.getChars(0,cwdl,out,0);
1374 while(in[inp] != 0) {
1376 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1377 if(in[inp] == '\0') break;
1378 while(in[inp] == '/') inp++;
1382 if(in[inp] == '\0') break;
1383 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1385 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1386 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1387 // Just read a /..{$,/}
1389 if(outp > 0) outp--;
1390 while(outp > 0 && out[outp] != '/') outp--;
1391 //System.err.println("After ..: " + new String(out,0,outp));
1394 // Just read a /.[^.] or /..[^/$]
1399 if(outp > 0 && out[outp-1] == '/') outp--;
1400 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1401 int outStart = out[0] == '/' ? 1 : 0;
1402 return new String(out,outStart,outp - outStart);
1405 FStat hostFStat(final File f, Object data) {
1408 FileInputStream fis = new FileInputStream(f);
1409 switch(fis.read()) {
1410 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1411 case '#': e = fis.read() == '!';
1414 } catch(IOException e2) { }
1415 HostFS fs = (HostFS) data;
1416 final int inode = fs.inodes.get(f.getAbsolutePath());
1417 final int devno = fs.devno;
1418 return new HostFStat(f,e) {
1419 public int inode() { return inode; }
1420 public int dev() { return devno; }
1424 FD hostFSDirFD(File f, Object _fs) {
1425 HostFS fs = (HostFS) _fs;
1426 return fs.new HostDirFD(f);
1429 public static class HostFS extends FS {
1430 InodeCache inodes = new InodeCache(4000);
1431 protected File root;
1432 public File getRoot() { return root; }
1434 private File hostFile(String path) {
1435 char sep = File.separatorChar;
1437 char buf[] = path.toCharArray();
1438 for(int i=0;i<buf.length;i++) {
1440 if(c == '/') buf[i] = sep;
1441 else if(c == sep) buf[i] = '/';
1443 path = new String(buf);
1445 return new File(root,path);
1448 public HostFS(String root) { this(new File(root)); }
1449 public HostFS(File root) { this.root = root; }
1451 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1452 final File f = hostFile(path);
1453 return r.hostFSOpen(f,flags,mode,this);
1456 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1457 File f = hostFile(path);
1458 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1459 if(!f.exists()) throw new ErrnoException(ENOENT);
1460 if(!f.delete()) throw new ErrnoException(EPERM);
1463 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1464 File f = hostFile(path);
1465 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1466 if(!f.exists()) return null;
1467 return r.hostFStat(f,this);
1470 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1471 File f = hostFile(path);
1472 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1473 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1474 if(f.exists()) throw new ErrnoException(ENOTDIR);
1475 File parent = getParentFile(f);
1476 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1477 if(!f.mkdir()) throw new ErrnoException(EIO);
1480 private static File getParentFile(File f) {
1481 String p = f.getParent();
1482 return p == null ? null : new File(p);
1485 public class HostDirFD extends DirFD {
1486 private final File f;
1487 private final File[] children;
1488 public HostDirFD(File f) {
1490 String[] l = f.list();
1491 children = new File[l.length];
1492 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1494 public int size() { return children.length; }
1495 public String name(int n) { return children[n].getName(); }
1496 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1497 public int parentInode() {
1498 File parent = getParentFile(f);
1499 // HACK: myInode() isn't really correct if we're not the root
1500 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1502 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1503 public int myDev() { return devno; }
1507 private static void putInt(byte[] buf, int off, int n) {
1508 buf[off+0] = (byte)((n>>>24)&0xff);
1509 buf[off+1] = (byte)((n>>>16)&0xff);
1510 buf[off+2] = (byte)((n>>> 8)&0xff);
1511 buf[off+3] = (byte)((n>>> 0)&0xff);
1514 public static abstract class DirFD extends FD {
1515 private int pos = -2;
1517 protected abstract int size();
1518 protected abstract String name(int n);
1519 protected abstract int inode(int n);
1520 protected abstract int myDev();
1521 protected abstract int parentInode();
1522 protected abstract int myInode();
1523 public int flags() { return O_RDONLY; }
1525 public int getdents(byte[] buf, int off, int len) {
1529 OUTER: for(;len > 0 && pos < size();pos++){
1533 ino = pos == -1 ? parentInode() : myInode();
1534 if(ino == -1) continue;
1535 reclen = 9 + (pos == -1 ? 2 : 1);
1536 if(reclen > len) break OUTER;
1538 if(pos == -1) buf[off+9] = '.';
1541 String f = name(pos);
1542 byte[] fb = getBytes(f);
1543 reclen = fb.length + 9;
1544 if(reclen > len) break OUTER;
1546 System.arraycopy(fb,0,buf,off+8,fb.length);
1549 buf[off+reclen-1] = 0; // null terminate
1550 reclen = (reclen + 3) & ~3; // add padding
1551 putInt(buf,off,reclen);
1552 putInt(buf,off+4,ino);
1559 protected FStat _fstat() {
1560 return new FStat() {
1561 public int type() { return S_IFDIR; }
1562 public int inode() { return myInode(); }
1563 public int dev() { return myDev(); }
1568 public static class DevFS extends FS {
1569 private static final int ROOT_INODE = 1;
1570 private static final int NULL_INODE = 2;
1571 private static final int ZERO_INODE = 3;
1572 private static final int FD_INODE = 4;
1573 private static final int FD_INODES = 32;
1575 private abstract class DevFStat extends FStat {
1576 public int dev() { return devno; }
1577 public int mode() { return 0666; }
1578 public int type() { return S_IFCHR; }
1579 public int nlink() { return 1; }
1580 public abstract int inode();
1583 private abstract class DevDirFD extends DirFD {
1584 public int myDev() { return devno; }
1587 private FD devZeroFD = new FD() {
1588 public int read(byte[] a, int off, int length) {
1589 /*Arrays.fill(a,off,off+length,(byte)0);*/
1590 for(int i=off;i<off+length;i++) a[i] = 0;
1593 public int write(byte[] a, int off, int length) { return length; }
1594 public int seek(int n, int whence) { return 0; }
1595 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1596 public int flags() { return O_RDWR; }
1598 private FD devNullFD = new FD() {
1599 public int read(byte[] a, int off, int length) { return 0; }
1600 public int write(byte[] a, int off, int length) { return length; }
1601 public int seek(int n, int whence) { return 0; }
1602 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1603 public int flags() { return O_RDWR; }
1606 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1607 if(path.equals("null")) return devNullFD;
1608 if(path.equals("zero")) return devZeroFD;
1609 if(path.startsWith("fd/")) {
1612 n = Integer.parseInt(path.substring(4));
1613 } catch(NumberFormatException e) {
1616 if(n < 0 || n >= OPEN_MAX) return null;
1617 if(r.fds[n] == null) return null;
1618 return r.fds[n].dup();
1620 if(path.equals("fd")) {
1622 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1623 final int[] files = new int[count];
1625 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1626 return new DevDirFD() {
1627 public int myInode() { return FD_INODE; }
1628 public int parentInode() { return ROOT_INODE; }
1629 public int inode(int n) { return FD_INODES + n; }
1630 public String name(int n) { return Integer.toString(files[n]); }
1631 public int size() { return files.length; }
1634 if(path.equals("")) {
1635 return new DevDirFD() {
1636 public int myInode() { return ROOT_INODE; }
1637 // HACK: We don't have any clean way to get the parent inode
1638 public int parentInode() { return ROOT_INODE; }
1639 public int inode(int n) {
1641 case 0: return NULL_INODE;
1642 case 1: return ZERO_INODE;
1643 case 2: return FD_INODE;
1648 public String name(int n) {
1650 case 0: return "null";
1651 case 1: return "zero";
1652 case 2: return "fd";
1653 default: return null;
1656 public int size() { return 3; }
1662 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1663 if(path.equals("null")) return devNullFD.fstat();
1664 if(path.equals("zero")) return devZeroFD.fstat();
1665 if(path.startsWith("fd/")) {
1668 n = Integer.parseInt(path.substring(3));
1669 } catch(NumberFormatException e) {
1672 if(n < 0 || n >= OPEN_MAX) return null;
1673 if(r.fds[n] == null) return null;
1674 return r.fds[n].fstat();
1676 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; }};
1677 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; }};
1681 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1682 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }
1686 public static class ResourceFS extends FS {
1687 final InodeCache inodes = new InodeCache(500);
1689 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1690 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1691 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }
1693 FStat connFStat(final URLConnection conn) {
1694 return new FStat() {
1695 public int type() { return S_IFREG; }
1696 public int nlink() { return 1; }
1697 public int mode() { return 0444; }
1698 public int size() { return conn.getContentLength(); }
1699 public int mtime() { return (int)(conn.getDate() / 1000); }
1700 public int inode() { return inodes.get(conn.getURL().toString()); }
1701 public int dev() { return devno; }
1705 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1706 URL url = r.getClass().getResource("/" + path);
1707 if(url == null) return null;
1709 return connFStat(url.openConnection());
1710 } catch(IOException e) {
1711 throw new ErrnoException(EIO);
1715 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1716 if((flags & ~3) != 0) {
1718 System.err.println("WARNING: Unsupported flags passed to ResourceFS.open(\"" + path + "\"): " + toHex(flags & ~3));
1719 throw new ErrnoException(ENOTSUP);
1721 if((flags&3) != RD_ONLY) throw new ErrnoException(EROFS);
1722 URL url = r.getClass().getResource("/" + path);
1723 if(url == null) return null;
1725 final URLConnection conn = url.openConnection();
1726 Seekable.InputStream si = new Seekable.InputStream(conn.getInputStream());
1727 return new SeekableFD(si,flags) { protected FStat _fstat() { return connFStat(conn); } };
1728 } catch(FileNotFoundException e) {
1729 if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) throw new ErrnoException(EACCES);
1731 } catch(IOException e) { throw new ErrnoException(EIO); }