1 package org.ibex.nestedvm;
3 import org.ibex.nestedvm.util.*;
4 // FEATURE: 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);
162 default: return super._syscall(syscall,a,b,c,d,e,f);
166 FD _open(String path, int flags, int mode) throws ErrnoException {
167 return gs.open(this,normalizePath(path),flags,mode);
170 private int sys_getppid() {
171 return parent == null ? 1 : parent.pid;
174 // FEATURE: Signal handling
175 // check flag only on backwards jumps to basic blocks without compulsatory checks
176 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
178 /** The kill syscall.
179 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
180 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
181 Anything else terminates the process. */
182 private int sys_kill(int pid, int signal) {
183 // This will only be called by raise() in newlib to invoke the default handler
184 // We don't have to worry about actually delivering the signal
185 if(pid != pid) return -ESRCH;
186 if(signal < 0 || signal >= 32) return -EINVAL;
199 exit(128+signal, true);
204 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
205 final int WNOHANG = 1;
206 if((options & ~(WNOHANG)) != 0) return -EINVAL;
207 if(pid == 0 || pid < -1) {
208 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
211 boolean blocking = (options&WNOHANG)==0;
213 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
214 if(children == null) return blocking ? -ECHILD : 0;
216 UnixRuntime done = null;
218 synchronized(children) {
221 if(exitedChildren.size() > 0) {
222 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
223 exitedChildren.removeElementAt(exitedChildren.size() - 1);
226 UnixRuntime t = gs.tasks[pid];
227 if(t.parent != this) return -ECHILD;
228 if(t.state == EXITED) {
229 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
233 // process group stuff, EINVAL returned above
234 throw new Error("should never happen");
237 if(!blocking) return 0;
238 try { children.wait(); } catch(InterruptedException e) {}
239 //System.err.println("waitpid woke up: " + exitedChildren.size());
241 gs.tasks[done.pid] = null;
246 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
252 if(children != null) synchronized(children) {
253 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
254 UnixRuntime child = (UnixRuntime) e.nextElement();
255 gs.tasks[child.pid] = null;
257 exitedChildren.removeAllElements();
258 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
259 UnixRuntime child = (UnixRuntime) e.nextElement();
262 activeChildren.removeAllElements();
265 UnixRuntime _parent = parent;
266 if(_parent == null) {
267 gs.tasks[pid] = null;
269 synchronized(_parent.children) {
271 gs.tasks[pid] = null;
273 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
274 parent.exitedChildren.addElement(this);
275 parent.children.notify();
281 protected Object clone() throws CloneNotSupportedException {
282 UnixRuntime r = (UnixRuntime) super.clone();
286 r.activeChildren = r.exitedChildren = null;
290 private int sys_fork() {
291 CPUState state = new CPUState();
293 int sp = state.r[SP];
297 r = (UnixRuntime) clone();
298 } catch(Exception e) {
307 } catch(ProcessTableFullExn e) {
311 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
312 if(children == null) {
313 children = new Object();
314 activeChildren = new Vector();
315 exitedChildren = new Vector();
317 activeChildren.addElement(r);
319 state.r[V0] = 0; // return 0 to child
320 state.pc += 4; // skip over syscall instruction
321 r.setCPUState(state);
324 new ForkedProcess(r);
329 public static final class ForkedProcess extends Thread {
330 private final UnixRuntime initial;
331 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
332 public void run() { UnixRuntime.executeAndExec(initial); }
335 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
336 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
338 public static int executeAndExec(UnixRuntime r) {
341 if(r.execute()) break;
342 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
344 if(r.state != EXECED) return r.exitStatus();
349 private String[] readStringArray(int addr) throws ReadFaultException {
351 for(int p=addr;memRead(p) != 0;p+=4) count++;
352 String[] a = new String[count];
353 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
357 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
358 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
361 private int exec(String normalizedPath, String[] argv, String[] envp) throws ErrnoException {
362 if(argv.length == 0) argv = new String[]{""};
364 // NOTE: For this little hack to work nestedvm.root MUST be "."
366 System.err.println("Execing normalized path: " + normalizedPath);
367 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
368 } catch(IOException e) { throw new Error(e); }*/
370 Object o = gs.exec(this,normalizedPath);
371 if(o == null) return -ENOENT;
373 if(o instanceof Class) {
376 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
377 return exec(r,argv,envp);
378 } catch(Exception e) {
383 String[] command = (String[]) o;
384 String[] newArgv = new String[argv.length + command[1] != null ? 2 : 1];
385 int p = command[0].lastIndexOf('/');
386 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
388 if(command[1] != null) newArgv[p++] = command[1];
389 newArgv[p++] = "/" + normalizedPath;
390 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
391 return exec(command[0],newArgv,envp);
395 private int exec(UnixRuntime r, String[] argv, String[] envp) {
397 //System.err.println("Execing " + r);
398 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
400 r.closeOnExec = closeOnExec;
401 // make sure this doesn't get messed with these since we didn't copy them
419 private final byte[] pipebuf = new byte[PIPE_BUF*4];
421 private int writePos;
423 public final FD reader = new Reader();
424 public final FD writer = new Writer();
426 public class Reader extends FD {
427 protected FStat _fstat() { return new SocketFStat(); }
428 public int read(byte[] buf, int off, int len) throws ErrnoException {
429 if(len == 0) return 0;
430 synchronized(Pipe.this) {
431 while(writePos != -1 && readPos == writePos) {
432 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
434 if(writePos == -1) return 0; // eof
435 len = Math.min(len,writePos-readPos);
436 System.arraycopy(pipebuf,readPos,buf,off,len);
438 if(readPos == writePos) Pipe.this.notify();
442 public int flags() { return O_RDONLY; }
443 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
446 public class Writer extends FD {
447 protected FStat _fstat() { return new SocketFStat(); }
448 public int write(byte[] buf, int off, int len) throws ErrnoException {
449 if(len == 0) return 0;
450 synchronized(Pipe.this) {
451 if(readPos == -1) throw new ErrnoException(EPIPE);
452 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
453 // not enough space to atomicly write the data
454 while(readPos != -1 && readPos != writePos) {
455 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
457 if(readPos == -1) throw new ErrnoException(EPIPE);
458 readPos = writePos = 0;
460 len = Math.min(len,pipebuf.length - writePos);
461 System.arraycopy(buf,off,pipebuf,writePos,len);
462 if(readPos == writePos) Pipe.this.notify();
467 public int flags() { return O_WRONLY; }
468 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
472 private int sys_pipe(int addr) {
473 Pipe pipe = new Pipe();
475 int fd1 = addFD(pipe.reader);
476 if(fd1 < 0) return -ENFILE;
477 int fd2 = addFD(pipe.writer);
478 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
482 memWrite(addr+4,fd2);
483 } catch(FaultException e) {
491 private int sys_dup2(int oldd, int newd) {
492 if(oldd == newd) return 0;
493 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
494 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
495 if(fds[oldd] == null) return -EBADFD;
496 if(fds[newd] != null) fds[newd].close();
497 fds[newd] = fds[oldd].dup();
501 private int sys_dup(int oldd) {
502 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
503 if(fds[oldd] == null) return -EBADFD;
504 FD fd = fds[oldd].dup();
505 int newd = addFD(fd);
506 if(newd < 0) { fd.close(); return -ENFILE; }
510 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
511 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
512 if(s == null) return -ENOENT;
516 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
517 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
518 if(s == null) return -ENOENT;
522 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
523 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
527 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
528 gs.unlink(this,normalizePath(cstring(cstring)));
532 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
533 byte[] b = getBytes(cwd);
534 if(size == 0) return -EINVAL;
535 if(size < b.length+2) return -ERANGE;
537 copyout(b,addr+1,b.length);
538 memset(addr+b.length+1,0,1);
542 private int sys_chdir(int addr) throws ErrnoException, FaultException {
543 String path = normalizePath(cstring(addr));
544 FStat st = gs.stat(this,path);
545 if(st == null) return -ENOENT;
546 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
551 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
552 count = Math.min(count,MAX_CHUNK);
553 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
554 if(fds[fdn] == null) return -EBADFD;
555 byte[] buf = byteBuf(count);
556 int n = fds[fdn].getdents(buf,0,count);
561 // FEATURE: UDP is totally broken
563 static class SocketFD extends FD {
564 public static final int TYPE_STREAM = 0;
565 public static final int TYPE_DGRAM = 1;
566 public static final int LISTEN = 2;
567 public int type() { return flags & 1; }
568 public boolean listen() { return (flags & 2) != 0; }
573 InetAddress bindAddr;
579 public SocketFD(int type) { flags = type; }
581 public void setOptions() {
583 if(o != null && type() == TYPE_STREAM && !listen()) {
584 Platform.socketSetKeepAlive((Socket)o,(options & SO_KEEPALIVE) != 0);
586 } catch(SocketException e) {
587 if(STDERR_DIAG) e.printStackTrace();
591 public void _close() {
594 if(type() == TYPE_STREAM) {
595 if(listen()) ((ServerSocket)o).close();
596 else ((Socket)o).close();
598 ((DatagramSocket)o).close();
600 } catch(IOException e) {
606 public int read(byte[] a, int off, int length) throws ErrnoException {
607 if(type() == TYPE_STREAM) {
608 if(is == null) throw new ErrnoException(EPIPE);
610 int n = is.read(a,off,length);
611 return n < 0 ? 0 : n;
612 } catch(IOException e) {
613 throw new ErrnoException(EIO);
616 if(off != 0) throw new IllegalArgumentException("off must be 0");
617 DatagramSocket ds = (DatagramSocket) o;
619 dp.setLength(length);
622 } catch(IOException e) {
623 throw new ErrnoException(EIO);
625 return dp.getLength();
629 public int write(byte[] a, int off, int length) throws ErrnoException {
630 if(type() == TYPE_STREAM) {
631 if(os == null) throw new ErrnoException(EPIPE);
633 os.write(a,off,length);
635 } catch(IOException e) {
636 throw new ErrnoException(EIO);
639 if(off != 0) throw new IllegalArgumentException("off must be 0");
640 DatagramSocket ds = (DatagramSocket) o;
642 dp.setLength(length);
645 } catch(IOException e) {
646 throw new ErrnoException(EIO);
648 return dp.getLength();
652 public int flags() { return O_RDWR; }
653 public FStat _fstat() { return new SocketFStat(); }
656 private int sys_socket(int domain, int type, int proto) {
657 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
658 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
661 private SocketFD getSocketFD(int fdn) throws ErrnoException {
662 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
663 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
664 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
666 return (SocketFD) fds[fdn];
669 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
670 SocketFD fd = getSocketFD(fdn);
672 if(fd.type() == SocketFD.TYPE_STREAM && fd.o != null) return -EISCONN;
673 int word1 = memRead(addr);
674 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
675 int port = word1 & 0xffff;
676 byte[] ip = new byte[4];
679 InetAddress inetAddr;
681 inetAddr = Platform.inetAddressFromBytes(ip);
682 } catch(UnknownHostException e) {
683 return -EADDRNOTAVAIL;
688 case SocketFD.TYPE_STREAM: {
689 Socket s = new Socket(inetAddr,port);
692 fd.is = s.getInputStream();
693 fd.os = s.getOutputStream();
696 case SocketFD.TYPE_DGRAM: {
697 if(fd.dp == null) fd.dp = new DatagramPacket(null,0);
698 fd.dp.setAddress(inetAddr);
703 throw new Error("should never happen");
705 } catch(IOException e) {
706 return -ECONNREFUSED;
712 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
713 String hostname = cstring(chostname);
714 int size = memRead(sizeAddr);
715 InetAddress[] inetAddrs;
717 inetAddrs = InetAddress.getAllByName(hostname);
718 } catch(UnknownHostException e) {
719 return HOST_NOT_FOUND;
721 int count = min(size/4,inetAddrs.length);
722 for(int i=0;i<count;i++,addr+=4) {
723 byte[] b = inetAddrs[i].getAddress();
726 memWrite(sizeAddr,count*4);
730 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
731 SocketFD fd = getSocketFD(fdn);
737 if(len != 4) return -EINVAL;
738 int val = memRead(valaddr);
739 if(val != 0) fd.options |= name;
740 else fd.options &= ~name;
745 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
749 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
754 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
755 SocketFD fd = getSocketFD(fdn);
761 int len = memRead(lenaddr);
762 if(len < 4) return -EINVAL;
763 int val = (fd.options & name) != 0 ? 1 : 0;
764 memWrite(valaddr,val);
769 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
773 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
778 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
779 SocketFD fd = getSocketFD(fdn);
781 if(fd.type() == SocketFD.TYPE_STREAM && fd.o != null) return -EISCONN;
782 int word1 = memRead(addr);
783 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
784 int port = word1 & 0xffff;
785 InetAddress inetAddr = null;
786 if(memRead(addr+4) != 0) {
787 byte[] ip = new byte[4];
791 inetAddr = Platform.inetAddressFromBytes(ip);
792 } catch(UnknownHostException e) {
793 return -EADDRNOTAVAIL;
798 case SocketFD.TYPE_STREAM: {
799 fd.bindAddr = inetAddr;
803 case SocketFD.TYPE_DGRAM: {
804 DatagramSocket s = (DatagramSocket) fd.o;
805 if(s != null) s.close();
807 fd.o = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
808 } catch(IOException e) {
814 throw new Error("should never happen");
818 private int sys_listen(int fdn, int backlog) throws ErrnoException {
819 SocketFD fd = getSocketFD(fdn);
820 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
821 if(fd.o != null) return -EISCONN;
822 if(fd.bindPort < 0) return -EOPNOTSUPP;
825 fd.o = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
826 fd.flags |= SocketFD.LISTEN;
828 } catch(IOException e) {
834 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
835 SocketFD fd = getSocketFD(fdn);
836 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
837 if(!fd.listen()) return -EOPNOTSUPP;
839 int size = memRead(lenaddr);
841 ServerSocket s = (ServerSocket) fd.o;
845 } catch(IOException e) {
850 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
851 byte[] b = client.getInetAddress().getAddress();
856 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
859 clientFD.is = client.getInputStream();
860 clientFD.os = client.getOutputStream();
861 } catch(IOException e) {
864 int n = addFD(clientFD);
865 if(n == -1) { clientFD.close(); return -ENFILE; }
869 private int sys_shutdown(int fdn, int how) throws ErrnoException {
870 SocketFD fd = getSocketFD(fdn);
871 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
872 if(fd.o == null) return -ENOTCONN;
874 Socket s = (Socket) fd.o;
877 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
878 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
879 } catch(IOException e) {
886 private static String hostName() {
888 return InetAddress.getLocalHost().getHostName();
889 } catch(UnknownHostException e) {
894 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
895 if(newp != 0) return -EPERM;
896 if(namelen == 0) return -ENOENT;
897 if(oldp == 0) return 0;
900 switch(memRead(nameaddr)) {
902 if(namelen != 2) break;
903 switch(memRead(nameaddr+4)) {
904 case KERN_OSTYPE: o = "NestedVM"; break;
905 case KERN_HOSTNAME: o = hostName(); break;
906 case KERN_OSRELEASE: o = VERSION; break;
907 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
911 if(namelen != 2) break;
912 switch(memRead(nameaddr+4)) {
913 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
917 if(o == null) return -ENOENT;
918 int len = memRead(oldlenaddr);
919 if(o instanceof String) {
920 byte[] b = getNullTerminatedBytes((String)o);
921 if(len < b.length) return -ENOMEM;
924 memWrite(oldlenaddr,len);
925 } else if(o instanceof Integer) {
926 if(len < 4) return -ENOMEM;
927 memWrite(oldp,((Integer)o).intValue());
929 throw new Error("should never happen");
934 // FEATURE: Run through the fork/wait stuff one more time
935 public static class GlobalState {
936 protected static final int OPEN = 1;
937 protected static final int STAT = 2;
938 protected static final int LSTAT = 3;
939 protected static final int MKDIR = 4;
940 protected static final int UNLINK = 5;
942 final UnixRuntime[] tasks;
945 private MP[] mps = new MP[0];
948 public GlobalState() { this(255); }
949 public GlobalState(int maxProcs) { this(maxProcs,true); }
950 public GlobalState(int maxProcs, boolean defaultMounts) {
951 tasks = new UnixRuntime[maxProcs+1];
953 addMount("/",new HostFS());
954 addMount("/dev",new DevFS());
958 private static class MP implements Sort.Comparable {
959 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
962 public int compareTo(Object o) {
963 if(!(o instanceof MP)) return 1;
964 return -path.compareTo(((MP)o).path);
968 public synchronized FS getMount(String path) {
969 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
970 if(path.equals("/")) return root;
971 path = path.substring(1);
972 for(int i=0;i<mps.length;i++)
973 if(mps[i].path.equals(path)) return mps[i].fs;
977 public synchronized void addMount(String path, FS fs) {
978 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
979 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
981 if(fs.owner != null) fs.owner.removeMount(fs);
984 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
985 path = path.substring(1);
986 int oldLength = mps.length;
987 MP[] newMPS = new MP[oldLength + 1];
988 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
989 newMPS[oldLength] = new MP(path,fs);
993 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
994 fs.devno = highdevno + 2;
997 public synchronized void removeMount(FS fs) {
998 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
999 throw new IllegalArgumentException("mount point doesn't exist");
1002 public synchronized void removeMount(String path) {
1003 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1004 if(path.equals("/")) {
1007 path = path.substring(1);
1009 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1010 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1015 private void removeMount(int index) {
1016 if(index == -1) { root.owner = null; root = null; return; }
1017 MP[] newMPS = new MP[mps.length - 1];
1018 System.arraycopy(mps,0,newMPS,0,index);
1019 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1023 // FEATURE: We shouldn't need to special case the root dir, it should work in the MP array
1024 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1025 int pl = normalizedPath.length();
1028 synchronized(this) { list = mps; }
1029 for(int i=0;i<list.length;i++) {
1031 int mpl = mp.path.length();
1032 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1033 return dispatch(mp.fs,op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1036 return dispatch(root,op,r,normalizedPath,arg1,arg2);
1039 // FEATURE: move this into FS so some filesystem can override it directly (devfs)
1040 private static Object dispatch(FS fs, int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1042 case OPEN: return fs.open(r,path,arg1,arg2);
1043 case STAT: return fs.stat(r,path);
1044 case LSTAT: return fs.lstat(r,path);
1045 case MKDIR: fs.mkdir(r,path,arg1); return null;
1046 case UNLINK: fs.unlink(r,path); return null;
1047 default: throw new Error("should never happen");
1051 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(OPEN,r,path,flags,mode); }
1052 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(STAT,r,path,0,0); }
1053 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(LSTAT,r,path,0,0); }
1054 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(MKDIR,r,path,mode,0); }
1055 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(UNLINK,r,path,0,0); }
1057 private Hashtable execCache = new Hashtable();
1058 private static class CacheEnt {
1059 public final long time;
1060 public final long size;
1061 public final Object o;
1062 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1065 public synchronized Object exec(UnixRuntime r, String path) throws ErrnoException {
1066 // HACK: Hideous hack to make a standalone busybox possible
1067 if(path.equals("bin/busybox") && r.getClass().getName().endsWith("BusyBox")) return r.getClass();
1069 FStat fstat = stat(r,path);
1070 if(fstat == null) return null;
1071 long mtime = fstat.mtime();
1072 long size = fstat.size();
1073 CacheEnt ent = (CacheEnt) execCache.get(path);
1075 //System.err.println("Found cached entry for " + path);
1076 if(ent.time == mtime && ent.size == size) return ent.o;
1077 //System.err.println("Cache was out of date");
1078 execCache.remove(path);
1080 FD fd = open(r,path,RD_ONLY,0);
1081 if(fd == null) return null;
1082 Seekable s = fd.seekable();
1084 String[] command = null;
1086 if(s == null) throw new ErrnoException(EACCES);
1087 byte[] buf = new byte[4096];
1090 int n = s.read(buf,0,buf.length);
1091 if(n == -1) throw new ErrnoException(ENOEXEC);
1094 case '\177': // possible ELF
1095 if(n < 4 && s.tryReadFully(buf,n,4-n) != 4-n) throw new ErrnoException(ENOEXEC);
1096 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') throw new ErrnoException(ENOEXEC);
1100 int n2 = s.read(buf,1,buf.length-1);
1101 if(n2 == -1) throw new ErrnoException(ENOEXEC);
1104 if(buf[1] != '!') throw new ErrnoException(ENOEXEC);
1108 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
1110 if(p == buf.length) break OUTER;
1111 n = s.read(buf,p,buf.length-p);
1113 command = new String[2];
1115 for(arg=2;arg<p;arg++) if(buf[arg] == ' ') break;
1118 while(arg < p && buf[arg] == ' ') arg++;
1119 command[0] = new String(buf,2,cmdEnd);
1120 command[1] = arg < p ? new String(buf,arg,p-arg) : null;
1122 command[0] = new String(buf,2,p-2);
1124 //System.err.println("command[0]: " + command[0] + " command[1]: " + command[1]);
1127 throw new ErrnoException(ENOEXEC);
1129 } catch(IOException e) {
1131 throw new ErrnoException(EIO);
1134 if(command == null) {
1135 // its an elf binary
1138 Class c = RuntimeCompiler.compile(s,"unixruntime");
1139 //System.err.println("Compile succeeded: " + c);
1140 ent = new CacheEnt(mtime,size,c);
1141 } catch(Compiler.Exn e) {
1142 if(STDERR_DIAG) e.printStackTrace();
1143 throw new ErrnoException(ENOEXEC);
1144 } catch(IOException e) {
1145 if(STDERR_DIAG) e.printStackTrace();
1146 throw new ErrnoException(EIO);
1149 ent = new CacheEnt(mtime,size,command);
1154 execCache.put(path,ent);
1159 public abstract static class FS {
1163 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1165 // If this returns null it'll be truned into an ENOENT
1166 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1167 // If this returns null it'll be turned into an ENOENT
1168 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1169 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1170 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1173 // chroot support should go in here if it is ever implemented chroot support in here
1174 private String normalizePath(String path) {
1175 boolean absolute = path.startsWith("/");
1176 int cwdl = cwd.length();
1178 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1179 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1180 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1182 char[] in = new char[path.length()+1];
1183 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1187 do { inp++; } while(in[inp] == '/');
1188 } else if(cwdl != 0) {
1189 cwd.getChars(0,cwdl,out,0);
1193 path.getChars(0,path.length(),in,0);
1194 while(in[inp] != 0) {
1196 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1197 if(in[inp] == '\0') break;
1198 while(in[inp] == '/') inp++;
1202 if(in[inp] == '\0') break;
1203 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1205 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1206 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1207 // Just read a /..{$,/}
1209 if(outp > 0) outp--;
1210 while(outp > 0 && out[outp] != '/') outp--;
1211 //System.err.println("After ..: " + new String(out,0,outp));
1214 // Just read a /.[^.] or /..[^/$]
1219 if(outp > 0 && out[outp-1] == '/') outp--;
1220 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1221 return new String(out,0,outp);
1224 FStat hostFStat(final File f, Object data) {
1227 FileInputStream fis = new FileInputStream(f);
1228 switch(fis.read()) {
1229 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1230 case '#': e = fis.read() == '!';
1233 } catch(IOException e2) { }
1234 HostFS fs = (HostFS) data;
1235 final int inode = fs.inodes.get(f.getAbsolutePath());
1236 final int devno = fs.devno;
1237 return new HostFStat(f,e) {
1238 public int inode() { return inode; }
1239 public int dev() { return devno; }
1243 FD hostFSDirFD(File f, Object _fs) {
1244 HostFS fs = (HostFS) _fs;
1245 return fs.new HostDirFD(f);
1248 public static class HostFS extends FS {
1249 InodeCache inodes = new InodeCache(4000);
1250 protected File root;
1251 public File getRoot() { return root; }
1253 static File hostRootDir() {
1254 if(Platform.getProperty("nestedvm.root") != null) {
1255 File f = new File(Platform.getProperty("nestedvm.root"));
1256 if(f.isDirectory()) return f;
1257 // fall through to case below
1259 String cwd = Platform.getProperty("user.dir");
1260 File f = new File(cwd != null ? cwd : ".");
1261 if(!f.exists()) throw new Error("Couldn't get File for cwd");
1262 f = new File(f.getAbsolutePath());
1263 while(f.getParent() != null) f = new File(f.getParent());
1264 // HACK: This works around a bug in some versions of ClassPath
1265 if(f.getPath().length() == 0) f = new File("/");
1269 private File hostFile(String path) {
1270 char sep = File.separatorChar;
1272 char buf[] = path.toCharArray();
1273 for(int i=0;i<buf.length;i++) {
1275 if(c == '/') buf[i] = sep;
1276 else if(c == sep) buf[i] = '/';
1278 path = new String(buf);
1280 return new File(root,path);
1283 public HostFS() { this(hostRootDir()); }
1284 public HostFS(String root) { this(new File(root)); }
1285 public HostFS(File root) { this.root = root; }
1288 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1289 final File f = hostFile(path);
1290 return r.hostFSOpen(f,flags,mode,this);
1293 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1294 File f = hostFile(path);
1295 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1296 if(!f.exists()) throw new ErrnoException(ENOENT);
1297 if(!f.delete()) throw new ErrnoException(EPERM);
1300 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1301 File f = hostFile(path);
1302 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1303 if(!f.exists()) return null;
1304 return r.hostFStat(f,this);
1307 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1308 File f = hostFile(path);
1309 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1310 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1311 if(f.exists()) throw new ErrnoException(ENOTDIR);
1312 File parent = getParentFile(f);
1313 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1314 if(!f.mkdir()) throw new ErrnoException(EIO);
1317 private static File getParentFile(File f) {
1318 String p = f.getParent();
1319 return p == null ? null : new File(f,p);
1322 public class HostDirFD extends DirFD {
1323 private final File f;
1324 private final File[] children;
1325 public HostDirFD(File f) {
1327 String[] l = f.list();
1328 children = new File[l.length];
1329 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1331 public int size() { return children.length; }
1332 public String name(int n) { return children[n].getName(); }
1333 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1334 public int parentInode() {
1335 File parent = getParentFile(f);
1336 return parent == null ? -1 : inodes.get(parent.getAbsolutePath());
1338 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1339 public int myDev() { return devno; }
1343 private static void putInt(byte[] buf, int off, int n) {
1344 buf[off+0] = (byte)((n>>>24)&0xff);
1345 buf[off+1] = (byte)((n>>>16)&0xff);
1346 buf[off+2] = (byte)((n>>> 8)&0xff);
1347 buf[off+3] = (byte)((n>>> 0)&0xff);
1350 public static abstract class DirFD extends FD {
1351 private int pos = -2;
1353 protected abstract int size();
1354 protected abstract String name(int n);
1355 protected abstract int inode(int n);
1356 protected abstract int myDev();
1357 protected abstract int parentInode();
1358 protected abstract int myInode();
1359 public int flags() { return O_RDONLY; }
1361 public int getdents(byte[] buf, int off, int len) {
1365 OUTER: for(;len > 0 && pos < size();pos++){
1369 ino = pos == -1 ? parentInode() : myInode();
1370 if(ino == -1) continue;
1371 reclen = 9 + (pos == -1 ? 2 : 1);
1372 if(reclen > len) break OUTER;
1374 if(pos == -1) buf[off+9] = '.';
1377 String f = name(pos);
1378 byte[] fb = getBytes(f);
1379 reclen = fb.length + 9;
1380 if(reclen > len) break OUTER;
1382 System.arraycopy(fb,0,buf,off+8,fb.length);
1385 buf[off+reclen-1] = 0; // null terminate
1386 reclen = (reclen + 3) & ~3; // add padding
1387 putInt(buf,off,reclen);
1388 putInt(buf,off+4,ino);
1395 protected FStat _fstat() {
1396 return new FStat() {
1397 public int type() { return S_IFDIR; }
1398 public int inode() { return myInode(); }
1399 public int dev() { return myDev(); }
1404 public static class DevFS extends FS {
1405 private static final int ROOT_INODE = 1;
1406 private static final int NULL_INODE = 2;
1407 private static final int ZERO_INODE = 3;
1408 private static final int FD_INODE = 4;
1409 private static final int FD_INODES = 32;
1411 private abstract class DevFStat extends FStat {
1412 public int dev() { return devno; }
1413 public int mode() { return 0666; }
1414 public int type() { return S_IFCHR; }
1415 public int nlink() { return 1; }
1416 public abstract int inode();
1419 private abstract class DevDirFD extends DirFD {
1420 public int myDev() { return devno; }
1423 private FD devZeroFD = new FD() {
1424 public int read(byte[] a, int off, int length) {
1425 /*Arrays.fill(a,off,off+length,(byte)0);*/
1426 for(int i=off;i<off+length;i++) a[i] = 0;
1429 public int write(byte[] a, int off, int length) { return length; }
1430 public int seek(int n, int whence) { return 0; }
1431 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1432 public int flags() { return O_RDWR; }
1434 private FD devNullFD = new FD() {
1435 public int read(byte[] a, int off, int length) { return 0; }
1436 public int write(byte[] a, int off, int length) { return length; }
1437 public int seek(int n, int whence) { return 0; }
1438 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1439 public int flags() { return O_RDWR; }
1442 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1443 if(path.equals("null")) return devNullFD;
1444 if(path.equals("zero")) return devZeroFD;
1445 if(path.startsWith("fd/")) {
1448 n = Integer.parseInt(path.substring(4));
1449 } catch(NumberFormatException e) {
1452 if(n < 0 || n >= OPEN_MAX) return null;
1453 if(r.fds[n] == null) return null;
1454 return r.fds[n].dup();
1456 if(path.equals("fd")) {
1458 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1459 final int[] files = new int[count];
1461 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1462 return new DevDirFD() {
1463 public int myInode() { return FD_INODE; }
1464 public int parentInode() { return ROOT_INODE; }
1465 public int inode(int n) { return FD_INODES + n; }
1466 public String name(int n) { return Integer.toString(files[n]); }
1467 public int size() { return files.length; }
1470 if(path.equals("")) {
1471 return new DevDirFD() {
1472 public int myInode() { return ROOT_INODE; }
1473 // FEATURE: Get the real parent inode somehow
1474 public int parentInode() { return -1; }
1475 public int inode(int n) {
1477 case 0: return NULL_INODE;
1478 case 1: return ZERO_INODE;
1479 case 2: return FD_INODE;
1484 public String name(int n) {
1486 case 0: return "null";
1487 case 1: return "zero";
1488 case 2: return "fd";
1489 default: return null;
1492 public int size() { return 3; }
1498 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1499 if(path.equals("null")) return devNullFD.fstat();
1500 if(path.equals("zero")) return devZeroFD.fstat();
1501 if(path.startsWith("fd/")) {
1504 n = Integer.parseInt(path.substring(3));
1505 } catch(NumberFormatException e) {
1508 if(n < 0 || n >= OPEN_MAX) return null;
1509 if(r.fds[n] == null) return null;
1510 return r.fds[n].fstat();
1512 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; }};
1513 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; }};
1517 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1518 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }