1 package org.ibex.nestedvm;
3 import org.ibex.nestedvm.util.*;
4 // HACK: This is ugly, this stuff needs to be in org.ibex.util or something
5 import org.ibex.classgen.util.Sort;
12 public abstract class UnixRuntime extends Runtime implements Cloneable {
13 /** The pid of this "process" */
15 private UnixRuntime parent;
16 public final int getPid() { return pid; }
18 private static final GlobalState defaultGS = new GlobalState();
19 private GlobalState gs;
20 public void setGlobalState(GlobalState gs) {
21 if(state != STOPPED) throw new IllegalStateException("can't change GlobalState when running");
25 /** proceses' current working directory - absolute path WITHOUT leading slash
26 "" = root, "bin" = /bin "usr/bin" = /usr/bin */
29 /** The runtime that should be run next when in state == EXECED */
30 private UnixRuntime execedRuntime;
32 private Object children; // used only for synchronizatin
33 private Vector activeChildren;
34 private Vector exitedChildren;
36 protected UnixRuntime(int pageSize, int totalPages) { this(pageSize,totalPages,false); }
37 protected UnixRuntime(int pageSize, int totalPages, boolean exec) {
38 super(pageSize,totalPages,exec);
42 String userdir = Platform.getProperty("user.dir");
43 String nvroot = Platform.getProperty("nestedvm.root");
45 if(userdir != null && nvroot == null) {
46 if(userdir.startsWith("/") && File.separatorChar == '/') {
47 cwd = userdir.substring(1);
49 Vector vec = new Vector();
50 File root = HostFS.hostRootDir();
51 String s = new File(userdir).getAbsolutePath();
53 System.err.println(s);
54 System.err.println(d);
55 while(!d.equals(root)) {
56 System.err.println("Got " + d.getName());
57 vec.addElement(d.getName());
58 if((s = d.getParent()) == null) break;
62 for(int i=vec.size()-1;i>=0;i--) cwd += (String) vec.elementAt(i) + (i==0?"":"/");
68 private static String posixTZ() {
69 StringBuffer sb = new StringBuffer();
70 TimeZone zone = TimeZone.getDefault();
71 int off = zone.getRawOffset() / 1000;
72 sb.append(Platform.timeZoneGetDisplayName(zone,false,false));
73 if(off > 0) sb.append("-");
75 sb.append(off/3600); off = off%3600;
76 if(off > 0) sb.append(":").append(off/60); off=off%60;
77 if(off > 0) sb.append(":").append(off);
78 if(zone.useDaylightTime())
79 sb.append(Platform.timeZoneGetDisplayName(zone,true,false));
83 private static boolean envHas(String key,String[] environ) {
84 for(int i=0;i<environ.length;i++)
85 if(environ[i]!=null && environ[i].startsWith(key + "=")) return true;
89 String[] createEnv(String[] extra) {
90 String[] defaults = new String[6];
92 if(extra == null) extra = new String[0];
93 if(!envHas("USER",extra) && Platform.getProperty("user.name") != null)
94 defaults[n++] = "USER=" + Platform.getProperty("user.name");
95 if(!envHas("HOME",extra) && Platform.getProperty("user.home") != null)
96 defaults[n++] = "HOME=" + Platform.getProperty("user.home");
97 if(!envHas("SHELL",extra)) defaults[n++] = "SHELL=/bin/sh";
98 if(!envHas("TERM",extra) && !win32Hacks) defaults[n++] = "TERM=vt100";
99 if(!envHas("TZ",extra)) defaults[n++] = "TZ=" + posixTZ();
100 if(!envHas("PATH",extra)) defaults[n++] = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin";
101 String[] env = new String[extra.length+n];
102 for(int i=0;i<n;i++) env[i] = defaults[i];
103 for(int i=0;i<extra.length;i++) env[n++] = extra[i];
107 private static class ProcessTableFullExn extends RuntimeException { }
110 UnixRuntime[] tasks = gs.tasks;
113 UnixRuntime prev = tasks[pid];
114 if(prev == null || prev == this || prev.pid != pid || prev.parent != parent)
115 throw new Error("should never happen");
116 synchronized(parent.children) {
117 int i = parent.activeChildren.indexOf(prev);
118 if(i == -1) throw new Error("should never happen");
119 parent.activeChildren.setElementAt(this,i);
123 int nextPID = gs.nextPID;
124 for(int i=nextPID;i<tasks.length;i++) if(tasks[i] == null) { newpid = i; break; }
125 if(newpid == -1) for(int i=1;i<nextPID;i++) if(tasks[i] == null) { newpid = i; break; }
126 if(newpid == -1) throw new ProcessTableFullExn();
128 gs.nextPID = newpid + 1;
134 int _syscall(int syscall, int a, int b, int c, int d, int e, int f) throws ErrnoException, FaultException {
136 case SYS_kill: return sys_kill(a,b);
137 case SYS_fork: return sys_fork();
138 case SYS_pipe: return sys_pipe(a);
139 case SYS_dup2: return sys_dup2(a,b);
140 case SYS_dup: return sys_dup(a);
141 case SYS_waitpid: return sys_waitpid(a,b,c);
142 case SYS_stat: return sys_stat(a,b);
143 case SYS_lstat: return sys_lstat(a,b);
144 case SYS_mkdir: return sys_mkdir(a,b);
145 case SYS_getcwd: return sys_getcwd(a,b);
146 case SYS_chdir: return sys_chdir(a);
147 case SYS_exec: return sys_exec(a,b,c);
148 case SYS_getdents: return sys_getdents(a,b,c,d);
149 case SYS_unlink: return sys_unlink(a);
150 case SYS_getppid: return sys_getppid();
151 case SYS_socket: return sys_socket(a,b,c);
152 case SYS_connect: return sys_connect(a,b,c);
153 case SYS_resolve_hostname: return sys_resolve_hostname(a,b,c);
154 case SYS_setsockopt: return sys_setsockopt(a,b,c,d,e);
155 case SYS_getsockopt: return sys_getsockopt(a,b,c,d,e);
156 case SYS_bind: return sys_bind(a,b,c);
157 case SYS_listen: return sys_listen(a,b);
158 case SYS_accept: return sys_accept(a,b,c);
159 case SYS_shutdown: return sys_shutdown(a,b);
160 case SYS_sysctl: return sys_sysctl(a,b,c,d,e,f);
161 case SYS_sendto: return sys_sendto(a,b,c,d,e,f);
162 case SYS_recvfrom: return sys_recvfrom(a,b,c,d,e,f);
163 case SYS_select: return sys_select(a,b,c,d,e);
165 default: return super._syscall(syscall,a,b,c,d,e,f);
169 FD _open(String path, int flags, int mode) throws ErrnoException {
170 return gs.open(this,normalizePath(path),flags,mode);
173 private int sys_getppid() {
174 return parent == null ? 1 : parent.pid;
177 // FEATURE: Signal handling
178 // check flag only on backwards jumps to basic blocks without compulsatory checks
179 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
181 /** The kill syscall.
182 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
183 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
184 Anything else terminates the process. */
185 private int sys_kill(int pid, int signal) {
186 // This will only be called by raise() in newlib to invoke the default handler
187 // We don't have to worry about actually delivering the signal
188 if(pid != pid) return -ESRCH;
189 if(signal < 0 || signal >= 32) return -EINVAL;
202 exit(128+signal, true);
207 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
208 final int WNOHANG = 1;
209 if((options & ~(WNOHANG)) != 0) return -EINVAL;
210 if(pid == 0 || pid < -1) {
211 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
214 boolean blocking = (options&WNOHANG)==0;
216 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
217 if(children == null) return blocking ? -ECHILD : 0;
219 UnixRuntime done = null;
221 synchronized(children) {
224 if(exitedChildren.size() > 0) {
225 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
226 exitedChildren.removeElementAt(exitedChildren.size() - 1);
229 if(pid >= gs.tasks.length) return -ECHILD;
230 UnixRuntime t = gs.tasks[pid];
231 if(t.parent != this) return -ECHILD;
232 if(t.state == EXITED) {
233 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
237 // process group stuff, EINVAL returned above
238 throw new Error("should never happen");
241 if(!blocking) return 0;
242 try { children.wait(); } catch(InterruptedException e) {}
243 //System.err.println("waitpid woke up: " + exitedChildren.size());
245 gs.tasks[done.pid] = null;
250 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
256 if(children != null) synchronized(children) {
257 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
258 UnixRuntime child = (UnixRuntime) e.nextElement();
259 gs.tasks[child.pid] = null;
261 exitedChildren.removeAllElements();
262 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
263 UnixRuntime child = (UnixRuntime) e.nextElement();
266 activeChildren.removeAllElements();
269 UnixRuntime _parent = parent;
270 if(_parent == null) {
271 gs.tasks[pid] = null;
273 synchronized(_parent.children) {
275 gs.tasks[pid] = null;
277 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
278 parent.exitedChildren.addElement(this);
279 parent.children.notify();
285 protected Object clone() throws CloneNotSupportedException {
286 UnixRuntime r = (UnixRuntime) super.clone();
290 r.activeChildren = r.exitedChildren = null;
294 private int sys_fork() {
298 r = (UnixRuntime) clone();
299 } catch(Exception e) {
308 } catch(ProcessTableFullExn e) {
312 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
313 if(children == null) {
314 children = new Object();
315 activeChildren = new Vector();
316 exitedChildren = new Vector();
318 activeChildren.addElement(r);
320 CPUState state = new CPUState();
322 state.r[V0] = 0; // return 0 to child
323 state.pc += 4; // skip over syscall instruction
324 r.setCPUState(state);
327 new ForkedProcess(r);
332 public static final class ForkedProcess extends Thread {
333 private final UnixRuntime initial;
334 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
335 public void run() { UnixRuntime.executeAndExec(initial); }
338 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
339 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
341 public static int executeAndExec(UnixRuntime r) {
344 if(r.execute()) break;
345 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
347 if(r.state != EXECED) return r.exitStatus();
352 private String[] readStringArray(int addr) throws ReadFaultException {
354 for(int p=addr;memRead(p) != 0;p+=4) count++;
355 String[] a = new String[count];
356 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
360 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
361 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
364 private int exec(String normalizedPath, String[] argv, String[] envp) throws ErrnoException {
365 if(argv.length == 0) argv = new String[]{""};
367 // NOTE: For this little hack to work nestedvm.root MUST be "."
369 System.err.println("Execing normalized path: " + normalizedPath);
370 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
371 } catch(IOException e) { throw new Error(e); }*/
373 Object o = gs.exec(this,normalizedPath);
374 if(o == null) return -ENOENT;
376 if(o instanceof Class) {
379 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
380 return exec(r,argv,envp);
381 } catch(Exception e) {
386 String[] command = (String[]) o;
387 String[] newArgv = new String[argv.length + command[1] != null ? 2 : 1];
388 int p = command[0].lastIndexOf('/');
389 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
391 if(command[1] != null) newArgv[p++] = command[1];
392 newArgv[p++] = "/" + normalizedPath;
393 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
394 return exec(command[0],newArgv,envp);
398 private int exec(UnixRuntime r, String[] argv, String[] envp) {
400 //System.err.println("Execing " + r);
401 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
403 r.closeOnExec = closeOnExec;
404 // make sure this doesn't get messed with these since we didn't copy them
422 private final byte[] pipebuf = new byte[PIPE_BUF*4];
424 private int writePos;
426 public final FD reader = new Reader();
427 public final FD writer = new Writer();
429 public class Reader extends FD {
430 protected FStat _fstat() { return new SocketFStat(); }
431 public int read(byte[] buf, int off, int len) throws ErrnoException {
432 if(len == 0) return 0;
433 synchronized(Pipe.this) {
434 while(writePos != -1 && readPos == writePos) {
435 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
437 if(writePos == -1) return 0; // eof
438 len = Math.min(len,writePos-readPos);
439 System.arraycopy(pipebuf,readPos,buf,off,len);
441 if(readPos == writePos) Pipe.this.notify();
445 public int flags() { return O_RDONLY; }
446 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
449 public class Writer extends FD {
450 protected FStat _fstat() { return new SocketFStat(); }
451 public int write(byte[] buf, int off, int len) throws ErrnoException {
452 if(len == 0) return 0;
453 synchronized(Pipe.this) {
454 if(readPos == -1) throw new ErrnoException(EPIPE);
455 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
456 // not enough space to atomicly write the data
457 while(readPos != -1 && readPos != writePos) {
458 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
460 if(readPos == -1) throw new ErrnoException(EPIPE);
461 readPos = writePos = 0;
463 len = Math.min(len,pipebuf.length - writePos);
464 System.arraycopy(buf,off,pipebuf,writePos,len);
465 if(readPos == writePos) Pipe.this.notify();
470 public int flags() { return O_WRONLY; }
471 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
475 private int sys_pipe(int addr) {
476 Pipe pipe = new Pipe();
478 int fd1 = addFD(pipe.reader);
479 if(fd1 < 0) return -ENFILE;
480 int fd2 = addFD(pipe.writer);
481 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
485 memWrite(addr+4,fd2);
486 } catch(FaultException e) {
494 private int sys_dup2(int oldd, int newd) {
495 if(oldd == newd) return 0;
496 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
497 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
498 if(fds[oldd] == null) return -EBADFD;
499 if(fds[newd] != null) fds[newd].close();
500 fds[newd] = fds[oldd].dup();
504 private int sys_dup(int oldd) {
505 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
506 if(fds[oldd] == null) return -EBADFD;
507 FD fd = fds[oldd].dup();
508 int newd = addFD(fd);
509 if(newd < 0) { fd.close(); return -ENFILE; }
513 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
514 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
515 if(s == null) return -ENOENT;
519 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
520 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
521 if(s == null) return -ENOENT;
525 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
526 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
530 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
531 gs.unlink(this,normalizePath(cstring(cstring)));
535 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
536 byte[] b = getBytes(cwd);
537 if(size == 0) return -EINVAL;
538 if(size < b.length+2) return -ERANGE;
540 copyout(b,addr+1,b.length);
541 memset(addr+b.length+1,0,1);
545 private int sys_chdir(int addr) throws ErrnoException, FaultException {
546 String path = normalizePath(cstring(addr));
547 FStat st = gs.stat(this,path);
548 if(st == null) return -ENOENT;
549 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
554 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
555 count = Math.min(count,MAX_CHUNK);
556 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
557 if(fds[fdn] == null) return -EBADFD;
558 byte[] buf = byteBuf(count);
559 int n = fds[fdn].getdents(buf,0,count);
564 static class SocketFD extends FD {
565 public static final int TYPE_STREAM = 0;
566 public static final int TYPE_DGRAM = 1;
567 public static final int LISTEN = 2;
568 public int type() { return flags & 1; }
569 public boolean listen() { return (flags & 2) != 0; }
578 InetAddress bindAddr;
580 InetAddress connectAddr;
581 int connectPort = -1;
587 private static final byte[] EMPTY = new byte[0];
588 public SocketFD(int type) {
590 if(type == TYPE_DGRAM)
591 dp = new DatagramPacket(EMPTY,0);
594 public void setOptions() {
596 if(s != null && type() == TYPE_STREAM && !listen()) {
597 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
599 } catch(SocketException e) {
600 if(STDERR_DIAG) e.printStackTrace();
604 public void _close() {
606 if(s != null) s.close();
607 if(ss != null) ss.close();
608 if(ds != null) ds.close();
609 } catch(IOException e) {
614 public int read(byte[] a, int off, int length) throws ErrnoException {
615 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
616 if(is == null) throw new ErrnoException(EPIPE);
618 int n = is.read(a,off,length);
619 return n < 0 ? 0 : n;
620 } catch(IOException e) {
621 throw new ErrnoException(EIO);
625 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
626 if(type() == TYPE_STREAM) return read(a,off,length);
628 if(off != 0) throw new IllegalArgumentException("off must be 0");
630 dp.setLength(length);
632 if(ds == null) ds = new DatagramSocket();
634 } catch(IOException e) {
635 if(STDERR_DIAG) e.printStackTrace();
636 throw new ErrnoException(EIO);
638 if(sockAddr != null) {
639 sockAddr[0] = dp.getAddress();
640 port[0] = dp.getPort();
642 return dp.getLength();
645 public int write(byte[] a, int off, int length) throws ErrnoException {
646 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
648 if(os == null) throw new ErrnoException(EPIPE);
650 os.write(a,off,length);
652 } catch(IOException e) {
653 throw new ErrnoException(EIO);
657 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
658 if(off != 0) throw new IllegalArgumentException("off must be 0");
659 if(type() == TYPE_STREAM) return write(a,off,length);
661 if(destAddr == null) {
662 destAddr = connectAddr;
663 destPort = connectPort;
665 if(destAddr == null) throw new ErrnoException(ENOTCONN);
668 dp.setAddress(destAddr);
669 dp.setPort(destPort);
671 dp.setLength(length);
674 if(ds == null) ds = new DatagramSocket();
676 } catch(IOException e) {
677 if(STDERR_DIAG) e.printStackTrace();
678 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
679 throw new ErrnoException(EIO);
681 return dp.getLength();
684 public int flags() { return O_RDWR; }
685 public FStat _fstat() { return new SocketFStat(); }
688 private int sys_socket(int domain, int type, int proto) {
689 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
690 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
693 private SocketFD getSocketFD(int fdn) throws ErrnoException {
694 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
695 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
696 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
698 return (SocketFD) fds[fdn];
701 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
702 SocketFD fd = getSocketFD(fdn);
704 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
705 int word1 = memRead(addr);
706 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
707 int port = word1 & 0xffff;
708 byte[] ip = new byte[4];
711 InetAddress inetAddr;
713 inetAddr = Platform.inetAddressFromBytes(ip);
714 } catch(UnknownHostException e) {
715 return -EADDRNOTAVAIL;
718 fd.connectAddr = inetAddr;
719 fd.connectPort = port;
723 case SocketFD.TYPE_STREAM: {
724 Socket s = new Socket(inetAddr,port);
727 fd.is = s.getInputStream();
728 fd.os = s.getOutputStream();
731 case SocketFD.TYPE_DGRAM:
734 throw new Error("should never happen");
736 } catch(IOException e) {
737 return -ECONNREFUSED;
743 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
744 String hostname = cstring(chostname);
745 int size = memRead(sizeAddr);
746 InetAddress[] inetAddrs;
748 inetAddrs = InetAddress.getAllByName(hostname);
749 } catch(UnknownHostException e) {
750 return HOST_NOT_FOUND;
752 int count = min(size/4,inetAddrs.length);
753 for(int i=0;i<count;i++,addr+=4) {
754 byte[] b = inetAddrs[i].getAddress();
757 memWrite(sizeAddr,count*4);
761 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
762 SocketFD fd = getSocketFD(fdn);
768 if(len != 4) return -EINVAL;
769 int val = memRead(valaddr);
770 if(val != 0) fd.options |= name;
771 else fd.options &= ~name;
776 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
780 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
785 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
786 SocketFD fd = getSocketFD(fdn);
792 int len = memRead(lenaddr);
793 if(len < 4) return -EINVAL;
794 int val = (fd.options & name) != 0 ? 1 : 0;
795 memWrite(valaddr,val);
800 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
804 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
809 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
810 SocketFD fd = getSocketFD(fdn);
812 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
813 int word1 = memRead(addr);
814 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
815 int port = word1 & 0xffff;
816 InetAddress inetAddr = null;
817 if(memRead(addr+4) != 0) {
818 byte[] ip = new byte[4];
822 inetAddr = Platform.inetAddressFromBytes(ip);
823 } catch(UnknownHostException e) {
824 return -EADDRNOTAVAIL;
829 case SocketFD.TYPE_STREAM: {
830 fd.bindAddr = inetAddr;
834 case SocketFD.TYPE_DGRAM: {
835 if(fd.ds != null) fd.ds.close();
837 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
838 } catch(IOException e) {
844 throw new Error("should never happen");
848 private int sys_listen(int fdn, int backlog) throws ErrnoException {
849 SocketFD fd = getSocketFD(fdn);
850 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
851 if(fd.ss != null || fd.s != null) return -EISCONN;
852 if(fd.bindPort < 0) return -EOPNOTSUPP;
855 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
856 fd.flags |= SocketFD.LISTEN;
858 } catch(IOException e) {
864 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
865 SocketFD fd = getSocketFD(fdn);
866 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
867 if(!fd.listen()) return -EOPNOTSUPP;
869 int size = memRead(lenaddr);
871 ServerSocket s = fd.ss;
875 } catch(IOException e) {
880 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
881 byte[] b = client.getInetAddress().getAddress();
886 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
889 clientFD.is = client.getInputStream();
890 clientFD.os = client.getOutputStream();
891 } catch(IOException e) {
894 int n = addFD(clientFD);
895 if(n == -1) { clientFD.close(); return -ENFILE; }
899 private int sys_shutdown(int fdn, int how) throws ErrnoException {
900 SocketFD fd = getSocketFD(fdn);
901 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
902 if(fd.s == null) return -ENOTCONN;
907 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
908 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
909 } catch(IOException e) {
916 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
917 SocketFD fd = getSocketFD(fdn);
918 if(flags != 0) throw new ErrnoException(EINVAL);
920 int word1 = memRead(destAddr);
921 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
922 int port = word1 & 0xffff;
923 InetAddress inetAddr;
924 byte[] ip = new byte[4];
925 copyin(destAddr+4,ip,4);
927 inetAddr = Platform.inetAddressFromBytes(ip);
928 } catch(UnknownHostException e) {
929 return -EADDRNOTAVAIL;
932 count = Math.min(count,MAX_CHUNK);
933 byte[] buf = byteBuf(count);
934 copyin(addr,buf,count);
936 return fd.sendto(buf,0,count,inetAddr,port);
937 } catch(ErrnoException e) {
938 if(e.errno == EPIPE) exit(128+13,true);
943 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
944 SocketFD fd = getSocketFD(fdn);
945 if(flags != 0) throw new ErrnoException(EINVAL);
947 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
948 int[] port = sourceAddr == 0 ? null : new int[1];
950 count = Math.min(count,MAX_CHUNK);
951 byte[] buf = byteBuf(count);
952 int n = fd.recvfrom(buf,0,count,inetAddr,port);
955 if(sourceAddr != 0) {
956 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
957 byte[] ip = inetAddr[0].getAddress();
958 copyout(ip,sourceAddr+4,4);
964 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
968 private static String hostName() {
970 return InetAddress.getLocalHost().getHostName();
971 } catch(UnknownHostException e) {
976 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
977 if(newp != 0) return -EPERM;
978 if(namelen == 0) return -ENOENT;
979 if(oldp == 0) return 0;
982 switch(memRead(nameaddr)) {
984 if(namelen != 2) break;
985 switch(memRead(nameaddr+4)) {
986 case KERN_OSTYPE: o = "NestedVM"; break;
987 case KERN_HOSTNAME: o = hostName(); break;
988 case KERN_OSRELEASE: o = VERSION; break;
989 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
993 if(namelen != 2) break;
994 switch(memRead(nameaddr+4)) {
995 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
999 if(o == null) return -ENOENT;
1000 int len = memRead(oldlenaddr);
1001 if(o instanceof String) {
1002 byte[] b = getNullTerminatedBytes((String)o);
1003 if(len < b.length) return -ENOMEM;
1005 copyout(b,oldp,len);
1006 memWrite(oldlenaddr,len);
1007 } else if(o instanceof Integer) {
1008 if(len < 4) return -ENOMEM;
1009 memWrite(oldp,((Integer)o).intValue());
1011 throw new Error("should never happen");
1016 public static class GlobalState {
1017 final UnixRuntime[] tasks;
1020 private MP[] mps = new MP[0];
1023 public GlobalState() { this(255); }
1024 public GlobalState(int maxProcs) { this(maxProcs,true); }
1025 public GlobalState(int maxProcs, boolean defaultMounts) {
1026 tasks = new UnixRuntime[maxProcs+1];
1028 addMount("/",new HostFS());
1029 addMount("/dev",new DevFS());
1033 private static class MP implements Sort.Comparable {
1034 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1037 public int compareTo(Object o) {
1038 if(!(o instanceof MP)) return 1;
1039 return -path.compareTo(((MP)o).path);
1043 public synchronized FS getMount(String path) {
1044 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1045 if(path.equals("/")) return root;
1046 path = path.substring(1);
1047 for(int i=0;i<mps.length;i++)
1048 if(mps[i].path.equals(path)) return mps[i].fs;
1052 public synchronized void addMount(String path, FS fs) {
1053 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1054 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1056 if(fs.owner != null) fs.owner.removeMount(fs);
1059 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1060 path = path.substring(1);
1061 int oldLength = mps.length;
1062 MP[] newMPS = new MP[oldLength + 1];
1063 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1064 newMPS[oldLength] = new MP(path,fs);
1068 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1069 fs.devno = highdevno + 2;
1072 public synchronized void removeMount(FS fs) {
1073 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1074 throw new IllegalArgumentException("mount point doesn't exist");
1077 public synchronized void removeMount(String path) {
1078 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1079 if(path.equals("/")) {
1082 path = path.substring(1);
1084 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1085 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1090 private void removeMount(int index) {
1091 if(index == -1) { root.owner = null; root = null; return; }
1092 MP[] newMPS = new MP[mps.length - 1];
1093 System.arraycopy(mps,0,newMPS,0,index);
1094 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1098 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1099 int pl = normalizedPath.length();
1102 synchronized(this) { list = mps; }
1103 for(int i=0;i<list.length;i++) {
1105 int mpl = mp.path.length();
1106 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1107 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1110 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1113 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1114 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1115 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1116 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1117 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1119 private Hashtable execCache = new Hashtable();
1120 private static class CacheEnt {
1121 public final long time;
1122 public final long size;
1123 public final Object o;
1124 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1127 public synchronized Object exec(UnixRuntime r, String path) throws ErrnoException {
1128 // HACK: Hideous hack to make a standalone busybox possible
1129 if(path.equals("bin/busybox") && r.getClass().getName().endsWith("BusyBox")) return r.getClass();
1131 FStat fstat = stat(r,path);
1132 if(fstat == null) return null;
1133 long mtime = fstat.mtime();
1134 long size = fstat.size();
1135 CacheEnt ent = (CacheEnt) execCache.get(path);
1137 //System.err.println("Found cached entry for " + path);
1138 if(ent.time == mtime && ent.size == size) return ent.o;
1139 //System.err.println("Cache was out of date");
1140 execCache.remove(path);
1142 FD fd = open(r,path,RD_ONLY,0);
1143 if(fd == null) return null;
1144 Seekable s = fd.seekable();
1146 String[] command = null;
1148 if(s == null) throw new ErrnoException(EACCES);
1149 byte[] buf = new byte[4096];
1152 int n = s.read(buf,0,buf.length);
1153 if(n == -1) throw new ErrnoException(ENOEXEC);
1156 case '\177': // possible ELF
1157 if(n < 4 && s.tryReadFully(buf,n,4-n) != 4-n) throw new ErrnoException(ENOEXEC);
1158 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') throw new ErrnoException(ENOEXEC);
1162 int n2 = s.read(buf,1,buf.length-1);
1163 if(n2 == -1) throw new ErrnoException(ENOEXEC);
1166 if(buf[1] != '!') throw new ErrnoException(ENOEXEC);
1170 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
1172 if(p == buf.length) break OUTER;
1173 n = s.read(buf,p,buf.length-p);
1175 command = new String[2];
1177 for(arg=2;arg<p;arg++) if(buf[arg] == ' ') break;
1180 while(arg < p && buf[arg] == ' ') arg++;
1181 command[0] = new String(buf,2,cmdEnd);
1182 command[1] = arg < p ? new String(buf,arg,p-arg) : null;
1184 command[0] = new String(buf,2,p-2);
1186 //System.err.println("command[0]: " + command[0] + " command[1]: " + command[1]);
1189 throw new ErrnoException(ENOEXEC);
1191 } catch(IOException e) {
1193 throw new ErrnoException(EIO);
1196 if(command == null) {
1197 // its an elf binary
1200 Class c = RuntimeCompiler.compile(s,"unixruntime");
1201 //System.err.println("Compile succeeded: " + c);
1202 ent = new CacheEnt(mtime,size,c);
1203 } catch(Compiler.Exn e) {
1204 if(STDERR_DIAG) e.printStackTrace();
1205 throw new ErrnoException(ENOEXEC);
1206 } catch(IOException e) {
1207 if(STDERR_DIAG) e.printStackTrace();
1208 throw new ErrnoException(EIO);
1211 ent = new CacheEnt(mtime,size,command);
1216 execCache.put(path,ent);
1221 public abstract static class FS {
1222 static final int OPEN = 1;
1223 static final int STAT = 2;
1224 static final int LSTAT = 3;
1225 static final int MKDIR = 4;
1226 static final int UNLINK = 5;
1231 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1233 case OPEN: return open(r,path,arg1,arg2);
1234 case STAT: return stat(r,path);
1235 case LSTAT: return lstat(r,path);
1236 case MKDIR: mkdir(r,path,arg1); return null;
1237 case UNLINK: unlink(r,path); return null;
1238 default: throw new Error("should never happen");
1242 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1244 // If this returns null it'll be truned into an ENOENT
1245 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1246 // If this returns null it'll be turned into an ENOENT
1247 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1248 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1249 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1252 // chroot support should go in here if it is ever implemented chroot support in here
1253 private String normalizePath(String path) {
1254 boolean absolute = path.startsWith("/");
1255 int cwdl = cwd.length();
1257 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1258 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1259 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1261 char[] in = new char[path.length()+1];
1262 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1266 do { inp++; } while(in[inp] == '/');
1267 } else if(cwdl != 0) {
1268 cwd.getChars(0,cwdl,out,0);
1272 path.getChars(0,path.length(),in,0);
1273 while(in[inp] != 0) {
1275 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1276 if(in[inp] == '\0') break;
1277 while(in[inp] == '/') inp++;
1281 if(in[inp] == '\0') break;
1282 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1284 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1285 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1286 // Just read a /..{$,/}
1288 if(outp > 0) outp--;
1289 while(outp > 0 && out[outp] != '/') outp--;
1290 //System.err.println("After ..: " + new String(out,0,outp));
1293 // Just read a /.[^.] or /..[^/$]
1298 if(outp > 0 && out[outp-1] == '/') outp--;
1299 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1300 return new String(out,0,outp);
1303 FStat hostFStat(final File f, Object data) {
1306 FileInputStream fis = new FileInputStream(f);
1307 switch(fis.read()) {
1308 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1309 case '#': e = fis.read() == '!';
1312 } catch(IOException e2) { }
1313 HostFS fs = (HostFS) data;
1314 final int inode = fs.inodes.get(f.getAbsolutePath());
1315 final int devno = fs.devno;
1316 return new HostFStat(f,e) {
1317 public int inode() { return inode; }
1318 public int dev() { return devno; }
1322 FD hostFSDirFD(File f, Object _fs) {
1323 HostFS fs = (HostFS) _fs;
1324 return fs.new HostDirFD(f);
1327 public static class HostFS extends FS {
1328 InodeCache inodes = new InodeCache(4000);
1329 protected File root;
1330 public File getRoot() { return root; }
1332 static File hostRootDir() {
1333 if(Platform.getProperty("nestedvm.root") != null) {
1334 File f = new File(Platform.getProperty("nestedvm.root"));
1335 if(f.isDirectory()) return f;
1336 // fall through to case below
1338 String cwd = Platform.getProperty("user.dir");
1339 File f = new File(cwd != null ? cwd : ".");
1340 if(!f.exists()) throw new Error("Couldn't get File for cwd");
1341 f = new File(f.getAbsolutePath());
1342 while(f.getParent() != null) f = new File(f.getParent());
1343 // This works around a bug in some versions of ClassPath
1344 if(f.getPath().length() == 0) f = new File("/");
1348 private File hostFile(String path) {
1349 char sep = File.separatorChar;
1351 char buf[] = path.toCharArray();
1352 for(int i=0;i<buf.length;i++) {
1354 if(c == '/') buf[i] = sep;
1355 else if(c == sep) buf[i] = '/';
1357 path = new String(buf);
1359 return new File(root,path);
1362 public HostFS() { this(hostRootDir()); }
1363 public HostFS(String root) { this(new File(root)); }
1364 public HostFS(File root) { this.root = root; }
1367 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1368 final File f = hostFile(path);
1369 return r.hostFSOpen(f,flags,mode,this);
1372 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1373 File f = hostFile(path);
1374 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1375 if(!f.exists()) throw new ErrnoException(ENOENT);
1376 if(!f.delete()) throw new ErrnoException(EPERM);
1379 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1380 File f = hostFile(path);
1381 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1382 if(!f.exists()) return null;
1383 return r.hostFStat(f,this);
1386 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1387 File f = hostFile(path);
1388 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1389 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1390 if(f.exists()) throw new ErrnoException(ENOTDIR);
1391 File parent = getParentFile(f);
1392 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1393 if(!f.mkdir()) throw new ErrnoException(EIO);
1396 private static File getParentFile(File f) {
1397 String p = f.getParent();
1398 return p == null ? null : new File(f,p);
1401 public class HostDirFD extends DirFD {
1402 private final File f;
1403 private final File[] children;
1404 public HostDirFD(File f) {
1406 String[] l = f.list();
1407 children = new File[l.length];
1408 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1410 public int size() { return children.length; }
1411 public String name(int n) { return children[n].getName(); }
1412 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1413 public int parentInode() {
1414 File parent = getParentFile(f);
1415 // HACK: myInode() isn't really correct if we're not the root
1416 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1418 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1419 public int myDev() { return devno; }
1423 private static void putInt(byte[] buf, int off, int n) {
1424 buf[off+0] = (byte)((n>>>24)&0xff);
1425 buf[off+1] = (byte)((n>>>16)&0xff);
1426 buf[off+2] = (byte)((n>>> 8)&0xff);
1427 buf[off+3] = (byte)((n>>> 0)&0xff);
1430 public static abstract class DirFD extends FD {
1431 private int pos = -2;
1433 protected abstract int size();
1434 protected abstract String name(int n);
1435 protected abstract int inode(int n);
1436 protected abstract int myDev();
1437 protected abstract int parentInode();
1438 protected abstract int myInode();
1439 public int flags() { return O_RDONLY; }
1441 public int getdents(byte[] buf, int off, int len) {
1445 OUTER: for(;len > 0 && pos < size();pos++){
1449 ino = pos == -1 ? parentInode() : myInode();
1450 if(ino == -1) continue;
1451 reclen = 9 + (pos == -1 ? 2 : 1);
1452 if(reclen > len) break OUTER;
1454 if(pos == -1) buf[off+9] = '.';
1457 String f = name(pos);
1458 byte[] fb = getBytes(f);
1459 reclen = fb.length + 9;
1460 if(reclen > len) break OUTER;
1462 System.arraycopy(fb,0,buf,off+8,fb.length);
1465 buf[off+reclen-1] = 0; // null terminate
1466 reclen = (reclen + 3) & ~3; // add padding
1467 putInt(buf,off,reclen);
1468 putInt(buf,off+4,ino);
1475 protected FStat _fstat() {
1476 return new FStat() {
1477 public int type() { return S_IFDIR; }
1478 public int inode() { return myInode(); }
1479 public int dev() { return myDev(); }
1484 public static class DevFS extends FS {
1485 private static final int ROOT_INODE = 1;
1486 private static final int NULL_INODE = 2;
1487 private static final int ZERO_INODE = 3;
1488 private static final int FD_INODE = 4;
1489 private static final int FD_INODES = 32;
1491 private abstract class DevFStat extends FStat {
1492 public int dev() { return devno; }
1493 public int mode() { return 0666; }
1494 public int type() { return S_IFCHR; }
1495 public int nlink() { return 1; }
1496 public abstract int inode();
1499 private abstract class DevDirFD extends DirFD {
1500 public int myDev() { return devno; }
1503 private FD devZeroFD = new FD() {
1504 public int read(byte[] a, int off, int length) {
1505 /*Arrays.fill(a,off,off+length,(byte)0);*/
1506 for(int i=off;i<off+length;i++) a[i] = 0;
1509 public int write(byte[] a, int off, int length) { return length; }
1510 public int seek(int n, int whence) { return 0; }
1511 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1512 public int flags() { return O_RDWR; }
1514 private FD devNullFD = new FD() {
1515 public int read(byte[] a, int off, int length) { return 0; }
1516 public int write(byte[] a, int off, int length) { return length; }
1517 public int seek(int n, int whence) { return 0; }
1518 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1519 public int flags() { return O_RDWR; }
1522 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1523 if(path.equals("null")) return devNullFD;
1524 if(path.equals("zero")) return devZeroFD;
1525 if(path.startsWith("fd/")) {
1528 n = Integer.parseInt(path.substring(4));
1529 } catch(NumberFormatException e) {
1532 if(n < 0 || n >= OPEN_MAX) return null;
1533 if(r.fds[n] == null) return null;
1534 return r.fds[n].dup();
1536 if(path.equals("fd")) {
1538 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1539 final int[] files = new int[count];
1541 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1542 return new DevDirFD() {
1543 public int myInode() { return FD_INODE; }
1544 public int parentInode() { return ROOT_INODE; }
1545 public int inode(int n) { return FD_INODES + n; }
1546 public String name(int n) { return Integer.toString(files[n]); }
1547 public int size() { return files.length; }
1550 if(path.equals("")) {
1551 return new DevDirFD() {
1552 public int myInode() { return ROOT_INODE; }
1553 // HACK: We don't have any clean way to get the parent inode
1554 public int parentInode() { return ROOT_INODE; }
1555 public int inode(int n) {
1557 case 0: return NULL_INODE;
1558 case 1: return ZERO_INODE;
1559 case 2: return FD_INODE;
1564 public String name(int n) {
1566 case 0: return "null";
1567 case 1: return "zero";
1568 case 2: return "fd";
1569 default: return null;
1572 public int size() { return 3; }
1578 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1579 if(path.equals("null")) return devNullFD.fstat();
1580 if(path.equals("zero")) return devZeroFD.fstat();
1581 if(path.startsWith("fd/")) {
1584 n = Integer.parseInt(path.substring(3));
1585 } catch(NumberFormatException e) {
1588 if(n < 0 || n >= OPEN_MAX) return null;
1589 if(r.fds[n] == null) return null;
1590 return r.fds[n].fstat();
1592 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; }};
1593 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; }};
1597 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1598 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }