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_fcntl: return sys_fcntl_lock(a,b,c);
160 case SYS_umask: return sys_umask(a);
162 default: return super._syscall(syscall,a,b,c,d,e,f);
166 FD _open(String path, int flags, int mode) throws ErrnoException {
167 path = normalizePath(path);
168 FD fd = gs.open(this,path,flags,mode);
169 if (fd != null && path != null) fd.setNormalizedPath(path);
173 private int sys_getppid() {
174 return parent == null ? 1 : parent.pid;
177 private int sys_chown(int fileAddr, int uid, int gid) {
180 private int sys_lchown(int fileAddr, int uid, int gid) {
183 private int sys_fchown(int fd, int uid, int gid) {
186 private int sys_chmod(int fileAddr, int uid, int gid) {
189 private int sys_fchmod(int fd, int uid, int gid) {
192 private int sys_umask(int mask) {
196 private int sys_access(int cstring, int mode) throws ErrnoException, ReadFaultException {
197 // FEATURE: sys_access
198 return gs.stat(this,cstring(cstring)) == null ? -ENOENT : 0;
201 private int sys_realpath(int inAddr, int outAddr) throws FaultException {
202 String s = normalizePath(cstring(inAddr));
203 byte[] b = getNullTerminatedBytes(s);
204 if(b.length > PATH_MAX) return -ERANGE;
205 copyout(b,outAddr,b.length);
209 // FEATURE: Signal handling
210 // check flag only on backwards jumps to basic blocks without compulsatory checks
211 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
213 /** The kill syscall.
214 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
215 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
216 Anything else terminates the process. */
217 private int sys_kill(int pid, int signal) {
218 // This will only be called by raise() in newlib to invoke the default handler
219 // We don't have to worry about actually delivering the signal
220 if(pid != pid) return -ESRCH;
221 if(signal < 0 || signal >= 32) return -EINVAL;
234 exit(128+signal, true);
239 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
240 final int WNOHANG = 1;
241 if((options & ~(WNOHANG)) != 0) return -EINVAL;
242 if(pid == 0 || pid < -1) {
243 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
246 boolean blocking = (options&WNOHANG)==0;
248 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
249 if(children == null) return blocking ? -ECHILD : 0;
251 UnixRuntime done = null;
253 synchronized(children) {
256 if(exitedChildren.size() > 0) {
257 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
258 exitedChildren.removeElementAt(exitedChildren.size() - 1);
261 if(pid >= gs.tasks.length) return -ECHILD;
262 UnixRuntime t = gs.tasks[pid];
263 if(t.parent != this) return -ECHILD;
264 if(t.state == EXITED) {
265 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
269 // process group stuff, EINVAL returned above
270 throw new Error("should never happen");
273 if(!blocking) return 0;
274 try { children.wait(); } catch(InterruptedException e) {}
275 //System.err.println("waitpid woke up: " + exitedChildren.size());
277 gs.tasks[done.pid] = null;
282 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
288 if(children != null) synchronized(children) {
289 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
290 UnixRuntime child = (UnixRuntime) e.nextElement();
291 gs.tasks[child.pid] = null;
293 exitedChildren.removeAllElements();
294 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
295 UnixRuntime child = (UnixRuntime) e.nextElement();
298 activeChildren.removeAllElements();
301 UnixRuntime _parent = parent;
302 if(_parent == null) {
303 gs.tasks[pid] = null;
305 synchronized(_parent.children) {
307 gs.tasks[pid] = null;
309 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
310 parent.exitedChildren.addElement(this);
311 parent.children.notify();
317 protected Object clone() throws CloneNotSupportedException {
318 UnixRuntime r = (UnixRuntime) super.clone();
322 r.activeChildren = r.exitedChildren = null;
326 private int sys_fork() {
330 r = (UnixRuntime) clone();
331 } catch(Exception e) {
340 } catch(ProcessTableFullExn e) {
344 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
345 if(children == null) {
346 children = new Object();
347 activeChildren = new Vector();
348 exitedChildren = new Vector();
350 activeChildren.addElement(r);
352 CPUState state = new CPUState();
354 state.r[V0] = 0; // return 0 to child
355 state.pc += 4; // skip over syscall instruction
356 r.setCPUState(state);
359 new ForkedProcess(r);
364 public static final class ForkedProcess extends Thread {
365 private final UnixRuntime initial;
366 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
367 public void run() { UnixRuntime.executeAndExec(initial); }
370 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
371 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
373 public static int executeAndExec(UnixRuntime r) {
376 if(r.execute()) break;
377 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
379 if(r.state != EXECED) return r.exitStatus();
384 private String[] readStringArray(int addr) throws ReadFaultException {
386 for(int p=addr;memRead(p) != 0;p+=4) count++;
387 String[] a = new String[count];
388 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
392 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
393 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
396 private final static Method runtimeCompilerCompile;
400 m = Class.forName("org.ibex.nestedvm.RuntimeCompiler").getMethod("compile",new Class[]{Seekable.class,String.class,String.class});
401 } catch(NoSuchMethodException e) {
403 } catch(ClassNotFoundException e) {
406 runtimeCompilerCompile = m;
409 public Class runtimeCompile(Seekable s, String sourceName) throws IOException {
410 if(runtimeCompilerCompile == null) {
411 if(STDERR_DIAG) System.err.println("WARNING: Exec attempted but RuntimeCompiler not found!");
416 return (Class) runtimeCompilerCompile.invoke(null,new Object[]{s,"unixruntime,maxinsnpermethod=256,lessconstants",sourceName});
417 } catch(IllegalAccessException e) {
420 } catch(InvocationTargetException e) {
421 Throwable t = e.getTargetException();
422 if(t instanceof IOException) throw (IOException) t;
423 if(t instanceof RuntimeException) throw (RuntimeException) t;
424 if(t instanceof Error) throw (Error) t;
425 if(STDERR_DIAG) t.printStackTrace();
430 private int exec(String path, String[] argv, String[] envp) throws ErrnoException {
431 if(argv.length == 0) argv = new String[]{""};
432 // HACK: Hideous hack to make a standalone busybox possible
433 if(path.equals("bin/busybox") && getClass().getName().endsWith("BusyBox"))
434 return execClass(getClass(),argv,envp);
436 // NOTE: For this little hack to work nestedvm.root MUST be "."
438 System.err.println("Execing normalized path: " + normalizedPath);
439 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
440 } catch(IOException e) { throw new Error(e); }*/
442 FStat fstat = gs.stat(this,path);
443 if(fstat == null) return -ENOENT;
444 GlobalState.CacheEnt ent = (GlobalState.CacheEnt) gs.execCache.get(path);
445 long mtime = fstat.mtime();
446 long size = fstat.size();
448 //System.err.println("Found cached entry for " + path);
449 if(ent.time ==mtime && ent.size == size) {
450 if(ent.o instanceof Class)
451 return execClass((Class) ent.o,argv,envp);
452 if(ent.o instanceof String[])
453 return execScript(path,(String[]) ent.o,argv,envp);
454 throw new Error("should never happen");
456 //System.err.println("Cache was out of date");
457 gs.execCache.remove(path);
460 FD fd = gs.open(this,path,RD_ONLY,0);
461 if(fd == null) throw new ErrnoException(ENOENT);
462 Seekable s = fd.seekable();
463 if(s == null) throw new ErrnoException(EACCES);
465 byte[] buf = new byte[4096];
468 int n = s.read(buf,0,buf.length);
469 if(n == -1) throw new ErrnoException(ENOEXEC);
472 case '\177': // possible ELF
473 if(n < 4) s.tryReadFully(buf,n,4-n);
474 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') return -ENOEXEC;
476 if(STDERR_DIAG) System.err.println("Running RuntimeCompiler for " + path);
477 Class c = runtimeCompile(s,path);
478 if(STDERR_DIAG) System.err.println("RuntimeCompiler finished for " + path);
479 if(c == null) throw new ErrnoException(ENOEXEC);
480 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
481 return execClass(c,argv,envp);
484 int n2 = s.read(buf,1,buf.length-1);
485 if(n2 == -1) return -ENOEXEC;
488 if(buf[1] != '!') return -ENOEXEC;
492 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
494 if(p == buf.length) break OUTER;
495 n = s.read(buf,p,buf.length-p);
498 for(;cmdStart<p;cmdStart++) if(buf[cmdStart]!=' ') break;
499 if(cmdStart == p) throw new ErrnoException(ENOEXEC);
500 int argStart = cmdStart;
501 for(;argStart<p;argStart++) if(buf[argStart] == ' ') break;
502 int cmdEnd = argStart;
503 while(argStart < p && buf[argStart] == ' ') argStart++;
504 String[] command = new String[] {
505 new String(buf,cmdStart,cmdEnd-cmdStart),
506 argStart < p ? new String(buf,argStart,p-argStart) : null
508 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
509 return execScript(path,command,argv,envp);
513 } catch(IOException e) {
520 public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
521 String[] newArgv = new String[argv.length-1 + (command[1] != null ? 3 : 2)];
522 int p = command[0].lastIndexOf('/');
523 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
524 newArgv[1] = "/" + path;
526 if(command[1] != null) newArgv[p++] = command[1];
527 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
528 if(p != newArgv.length) throw new Error("p != newArgv.length");
529 System.err.println("Execing: " + command[0]);
530 for(int i=0;i<newArgv.length;i++) System.err.println("execing [" + i + "] " + newArgv[i]);
531 return exec(command[0],newArgv,envp);
534 public int execClass(Class c,String[] argv, String[] envp) {
536 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
537 return exec(r,argv,envp);
538 } catch(Exception e) {
544 private int exec(UnixRuntime r, String[] argv, String[] envp) {
545 //System.err.println("Execing " + r);
546 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
548 r.closeOnExec = closeOnExec;
549 // make sure this doesn't get messed with these since we didn't copy them
567 private final byte[] pipebuf = new byte[PIPE_BUF*4];
569 private int writePos;
571 public final FD reader = new Reader();
572 public final FD writer = new Writer();
574 public class Reader extends FD {
575 protected FStat _fstat() { return new SocketFStat(); }
576 public int read(byte[] buf, int off, int len) throws ErrnoException {
577 if(len == 0) return 0;
578 synchronized(Pipe.this) {
579 while(writePos != -1 && readPos == writePos) {
580 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
582 if(writePos == -1) return 0; // eof
583 len = Math.min(len,writePos-readPos);
584 System.arraycopy(pipebuf,readPos,buf,off,len);
586 if(readPos == writePos) Pipe.this.notify();
590 public int flags() { return O_RDONLY; }
591 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
594 public class Writer extends FD {
595 protected FStat _fstat() { return new SocketFStat(); }
596 public int write(byte[] buf, int off, int len) throws ErrnoException {
597 if(len == 0) return 0;
598 synchronized(Pipe.this) {
599 if(readPos == -1) throw new ErrnoException(EPIPE);
600 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
601 // not enough space to atomicly write the data
602 while(readPos != -1 && readPos != writePos) {
603 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
605 if(readPos == -1) throw new ErrnoException(EPIPE);
606 readPos = writePos = 0;
608 len = Math.min(len,pipebuf.length - writePos);
609 System.arraycopy(buf,off,pipebuf,writePos,len);
610 if(readPos == writePos) Pipe.this.notify();
615 public int flags() { return O_WRONLY; }
616 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
620 private int sys_pipe(int addr) {
621 Pipe pipe = new Pipe();
623 int fd1 = addFD(pipe.reader);
624 if(fd1 < 0) return -ENFILE;
625 int fd2 = addFD(pipe.writer);
626 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
630 memWrite(addr+4,fd2);
631 } catch(FaultException e) {
639 private int sys_dup2(int oldd, int newd) {
640 if(oldd == newd) return 0;
641 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
642 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
643 if(fds[oldd] == null) return -EBADFD;
644 if(fds[newd] != null) fds[newd].close();
645 fds[newd] = fds[oldd].dup();
649 private int sys_dup(int oldd) {
650 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
651 if(fds[oldd] == null) return -EBADFD;
652 FD fd = fds[oldd].dup();
653 int newd = addFD(fd);
654 if(newd < 0) { fd.close(); return -ENFILE; }
658 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
659 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
660 if(s == null) return -ENOENT;
664 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
665 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
666 if(s == null) return -ENOENT;
670 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
671 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
675 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
676 gs.unlink(this,normalizePath(cstring(cstring)));
680 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
681 byte[] b = getBytes(cwd);
682 if(size == 0) return -EINVAL;
683 if(size < b.length+2) return -ERANGE;
685 copyout(b,addr+1,b.length);
686 memset(addr+b.length+1,0,1);
690 private int sys_chdir(int addr) throws ErrnoException, FaultException {
691 String path = normalizePath(cstring(addr));
692 FStat st = gs.stat(this,path);
693 if(st == null) return -ENOENT;
694 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
699 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
700 count = Math.min(count,MAX_CHUNK);
701 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
702 if(fds[fdn] == null) return -EBADFD;
703 byte[] buf = byteBuf(count);
704 int n = fds[fdn].getdents(buf,0,count);
709 void _preCloseFD(FD fd) {
710 // release all fcntl locks on this file
711 Seekable s = fd.seekable();
712 if (s == null) return;
715 for (int i=0; i < gs.locks.length; i++) {
716 Seekable.Lock l = gs.locks[i];
717 if (l == null) continue;
718 if (s.equals(l.seekable()) && l.getOwner() == this) {
723 } catch (IOException e) { throw new RuntimeException(e); }
726 void _postCloseFD(FD fd) {
727 if (fd.isMarkedForDeleteOnClose()) {
728 try { gs.unlink(this, fd.getNormalizedPath()); }
729 catch (Throwable t) {}
733 /** Implements the F_GETLK and F_SETLK cases of fcntl syscall.
734 * If l_start = 0 and l_len = 0 the lock refers to the entire file.
735 * Uses GlobalState to ensure locking across processes in the same JVM.
737 short l_type; // lock type: F_UNLCK, F_RDLCK, F_WRLCK
738 short l_whence; // type of l_start: SEEK_SET, SEEK_CUR, SEEK_END
739 long l_start; // starting offset, bytes
740 long l_len; // len = 0 means until EOF
741 short l_pid; // lock owner
742 short l_xxx; // padding
745 private int sys_fcntl_lock(int fdn, int cmd, int arg) throws FaultException{
746 if (cmd != F_GETLK && cmd != F_SETLK) return sys_fcntl(fdn, cmd, arg);
748 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
749 if(fds[fdn] == null) return -EBADFD;
752 if (arg == 0) return -EINVAL;
753 int word = memRead(arg);
754 int l_start = memRead(arg+4);
755 int l_len = memRead(arg+8);
756 int l_type = word>>16;
757 int l_whence = word&0x00ff;
759 Seekable.Lock[] locks = gs.locks;
760 Seekable s = fd.seekable();
761 if (s == null) return -EINVAL;
766 case SEEK_SET: break;
767 case SEEK_CUR: l_start += s.pos(); break;
768 case SEEK_END: l_start += s.length(); break;
772 if (cmd == F_GETLK) {
773 // The simple Java file locking below will happily return
774 // a lock that overlaps one already held by the JVM. Thus
775 // we must check over all the locks held by other Runtimes
776 for (int i=0; i < locks.length; i++) {
777 if (locks[i] == null || !s.equals(locks[i].seekable()))
779 if (!locks[i].overlaps(l_start, l_len))
781 if (locks[i].getOwner() == this)
783 if (locks[i].isShared() && l_type == F_RDLCK)
786 // overlapping lock held by another process
790 // check if an area is lockable by attempting to obtain a lock
791 Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
793 if (lock != null) { // no lock exists
794 memWrite(arg, SEEK_SET|(F_UNLCK<<16));
801 // now processing F_SETLK
802 if (cmd != F_SETLK) return -EINVAL;
804 if (l_type == F_UNLCK) {
805 // release all locks that fall within the boundaries given
806 for (int i=0; i < locks.length; i++) {
807 if (locks[i] == null || !s.equals(locks[i].seekable()))
809 if (locks[i].getOwner() != this) continue;
811 int pos = (int)locks[i].position();
812 if (pos < l_start) continue;
813 if (l_start != 0 && l_len != 0) // start/len 0 means unlock all
814 if (pos + locks[i].size() > l_start + l_len)
822 } else if (l_type == F_RDLCK || l_type == F_WRLCK) {
823 // first see if a lock already exists
824 for (int i=0; i < locks.length; i++) {
825 if (locks[i] == null || !s.equals(locks[i].seekable()))
828 if (locks[i].getOwner() == this) {
829 // if this Runtime owns an overlapping lock work with it
830 if (locks[i].contained(l_start, l_len)) {
833 } else if (locks[i].contains(l_start, l_len)) {
834 if (locks[i].isShared() == (l_type == F_RDLCK)) {
835 // return this more general lock
836 memWrite(arg+4, (int)locks[i].position());
837 memWrite(arg+8, (int)locks[i].size());
845 // if another Runtime has an lock and it is exclusive or
846 // we want an exclusive lock then fail
847 if (locks[i].overlaps(l_start, l_len)
848 && (!locks[i].isShared() || l_type == F_WRLCK))
854 Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
855 if (lock == null) return -EAGAIN;
859 for (i=0; i < locks.length; i++)
860 if (locks[i] == null) break;
861 if (i == locks.length) return -ENOLCK;
869 } catch (IOException e) { throw new RuntimeException(e); }
872 static class SocketFD extends FD {
873 public static final int TYPE_STREAM = 0;
874 public static final int TYPE_DGRAM = 1;
875 public static final int LISTEN = 2;
876 public int type() { return flags & 1; }
877 public boolean listen() { return (flags & 2) != 0; }
886 InetAddress bindAddr;
888 InetAddress connectAddr;
889 int connectPort = -1;
895 private static final byte[] EMPTY = new byte[0];
896 public SocketFD(int type) {
898 if(type == TYPE_DGRAM)
899 dp = new DatagramPacket(EMPTY,0);
902 public void setOptions() {
904 if(s != null && type() == TYPE_STREAM && !listen()) {
905 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
907 } catch(SocketException e) {
908 if(STDERR_DIAG) e.printStackTrace();
912 public void _close() {
914 if(s != null) s.close();
915 if(ss != null) ss.close();
916 if(ds != null) ds.close();
917 } catch(IOException e) {
922 public int read(byte[] a, int off, int length) throws ErrnoException {
923 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
924 if(is == null) throw new ErrnoException(EPIPE);
926 int n = is.read(a,off,length);
927 return n < 0 ? 0 : n;
928 } catch(IOException e) {
929 throw new ErrnoException(EIO);
933 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
934 if(type() == TYPE_STREAM) return read(a,off,length);
936 if(off != 0) throw new IllegalArgumentException("off must be 0");
938 dp.setLength(length);
940 if(ds == null) ds = new DatagramSocket();
942 } catch(IOException e) {
943 if(STDERR_DIAG) e.printStackTrace();
944 throw new ErrnoException(EIO);
946 if(sockAddr != null) {
947 sockAddr[0] = dp.getAddress();
948 port[0] = dp.getPort();
950 return dp.getLength();
953 public int write(byte[] a, int off, int length) throws ErrnoException {
954 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
956 if(os == null) throw new ErrnoException(EPIPE);
958 os.write(a,off,length);
960 } catch(IOException e) {
961 throw new ErrnoException(EIO);
965 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
966 if(off != 0) throw new IllegalArgumentException("off must be 0");
967 if(type() == TYPE_STREAM) return write(a,off,length);
969 if(destAddr == null) {
970 destAddr = connectAddr;
971 destPort = connectPort;
973 if(destAddr == null) throw new ErrnoException(ENOTCONN);
976 dp.setAddress(destAddr);
977 dp.setPort(destPort);
979 dp.setLength(length);
982 if(ds == null) ds = new DatagramSocket();
984 } catch(IOException e) {
985 if(STDERR_DIAG) e.printStackTrace();
986 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
987 throw new ErrnoException(EIO);
989 return dp.getLength();
992 public int flags() { return O_RDWR; }
993 public FStat _fstat() { return new SocketFStat(); }
996 private int sys_socket(int domain, int type, int proto) {
997 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
998 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
1001 private SocketFD getSocketFD(int fdn) throws ErrnoException {
1002 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
1003 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
1004 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
1006 return (SocketFD) fds[fdn];
1009 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
1010 SocketFD fd = getSocketFD(fdn);
1012 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
1013 int word1 = memRead(addr);
1014 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1015 int port = word1 & 0xffff;
1016 byte[] ip = new byte[4];
1017 copyin(addr+4,ip,4);
1019 InetAddress inetAddr;
1021 inetAddr = Platform.inetAddressFromBytes(ip);
1022 } catch(UnknownHostException e) {
1023 return -EADDRNOTAVAIL;
1026 fd.connectAddr = inetAddr;
1027 fd.connectPort = port;
1031 case SocketFD.TYPE_STREAM: {
1032 Socket s = new Socket(inetAddr,port);
1035 fd.is = s.getInputStream();
1036 fd.os = s.getOutputStream();
1039 case SocketFD.TYPE_DGRAM:
1042 throw new Error("should never happen");
1044 } catch(IOException e) {
1045 return -ECONNREFUSED;
1051 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
1052 String hostname = cstring(chostname);
1053 int size = memRead(sizeAddr);
1054 InetAddress[] inetAddrs;
1056 inetAddrs = InetAddress.getAllByName(hostname);
1057 } catch(UnknownHostException e) {
1058 return HOST_NOT_FOUND;
1060 int count = min(size/4,inetAddrs.length);
1061 for(int i=0;i<count;i++,addr+=4) {
1062 byte[] b = inetAddrs[i].getAddress();
1065 memWrite(sizeAddr,count*4);
1069 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
1070 SocketFD fd = getSocketFD(fdn);
1075 case SO_KEEPALIVE: {
1076 if(len != 4) return -EINVAL;
1077 int val = memRead(valaddr);
1078 if(val != 0) fd.options |= name;
1079 else fd.options &= ~name;
1084 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
1085 return -ENOPROTOOPT;
1088 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
1089 return -ENOPROTOOPT;
1093 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
1094 SocketFD fd = getSocketFD(fdn);
1099 case SO_KEEPALIVE: {
1100 int len = memRead(lenaddr);
1101 if(len < 4) return -EINVAL;
1102 int val = (fd.options & name) != 0 ? 1 : 0;
1103 memWrite(valaddr,val);
1104 memWrite(lenaddr,4);
1108 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
1109 return -ENOPROTOOPT;
1112 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
1113 return -ENOPROTOOPT;
1117 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
1118 SocketFD fd = getSocketFD(fdn);
1120 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
1121 int word1 = memRead(addr);
1122 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1123 int port = word1 & 0xffff;
1124 InetAddress inetAddr = null;
1125 if(memRead(addr+4) != 0) {
1126 byte[] ip = new byte[4];
1127 copyin(addr+4,ip,4);
1130 inetAddr = Platform.inetAddressFromBytes(ip);
1131 } catch(UnknownHostException e) {
1132 return -EADDRNOTAVAIL;
1137 case SocketFD.TYPE_STREAM: {
1138 fd.bindAddr = inetAddr;
1142 case SocketFD.TYPE_DGRAM: {
1143 if(fd.ds != null) fd.ds.close();
1145 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
1146 } catch(IOException e) {
1152 throw new Error("should never happen");
1156 private int sys_listen(int fdn, int backlog) throws ErrnoException {
1157 SocketFD fd = getSocketFD(fdn);
1158 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1159 if(fd.ss != null || fd.s != null) return -EISCONN;
1160 if(fd.bindPort < 0) return -EOPNOTSUPP;
1163 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
1164 fd.flags |= SocketFD.LISTEN;
1166 } catch(IOException e) {
1172 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
1173 SocketFD fd = getSocketFD(fdn);
1174 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1175 if(!fd.listen()) return -EOPNOTSUPP;
1177 int size = memRead(lenaddr);
1179 ServerSocket s = fd.ss;
1182 client = s.accept();
1183 } catch(IOException e) {
1188 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
1189 byte[] b = client.getInetAddress().getAddress();
1190 copyout(b,addr+4,4);
1191 memWrite(lenaddr,8);
1194 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
1195 clientFD.s = client;
1197 clientFD.is = client.getInputStream();
1198 clientFD.os = client.getOutputStream();
1199 } catch(IOException e) {
1202 int n = addFD(clientFD);
1203 if(n == -1) { clientFD.close(); return -ENFILE; }
1207 private int sys_shutdown(int fdn, int how) throws ErrnoException {
1208 SocketFD fd = getSocketFD(fdn);
1209 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
1210 if(fd.s == null) return -ENOTCONN;
1215 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
1216 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
1217 } catch(IOException e) {
1224 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
1225 SocketFD fd = getSocketFD(fdn);
1226 if(flags != 0) throw new ErrnoException(EINVAL);
1228 int word1 = memRead(destAddr);
1229 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1230 int port = word1 & 0xffff;
1231 InetAddress inetAddr;
1232 byte[] ip = new byte[4];
1233 copyin(destAddr+4,ip,4);
1235 inetAddr = Platform.inetAddressFromBytes(ip);
1236 } catch(UnknownHostException e) {
1237 return -EADDRNOTAVAIL;
1240 count = Math.min(count,MAX_CHUNK);
1241 byte[] buf = byteBuf(count);
1242 copyin(addr,buf,count);
1244 return fd.sendto(buf,0,count,inetAddr,port);
1245 } catch(ErrnoException e) {
1246 if(e.errno == EPIPE) exit(128+13,true);
1251 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
1252 SocketFD fd = getSocketFD(fdn);
1253 if(flags != 0) throw new ErrnoException(EINVAL);
1255 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
1256 int[] port = sourceAddr == 0 ? null : new int[1];
1258 count = Math.min(count,MAX_CHUNK);
1259 byte[] buf = byteBuf(count);
1260 int n = fd.recvfrom(buf,0,count,inetAddr,port);
1261 copyout(buf,addr,n);
1263 if(sourceAddr != 0) {
1264 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
1265 byte[] ip = inetAddr[0].getAddress();
1266 copyout(ip,sourceAddr+4,4);
1272 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
1276 private static String hostName() {
1278 return InetAddress.getLocalHost().getHostName();
1279 } catch(UnknownHostException e) {
1284 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
1285 if(newp != 0) return -EPERM;
1286 if(namelen == 0) return -ENOENT;
1287 if(oldp == 0) return 0;
1290 switch(memRead(nameaddr)) {
1292 if(namelen != 2) break;
1293 switch(memRead(nameaddr+4)) {
1294 case KERN_OSTYPE: o = "NestedVM"; break;
1295 case KERN_HOSTNAME: o = hostName(); break;
1296 case KERN_OSRELEASE: o = VERSION; break;
1297 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
1301 if(namelen != 2) break;
1302 switch(memRead(nameaddr+4)) {
1303 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
1307 if(o == null) return -ENOENT;
1308 int len = memRead(oldlenaddr);
1309 if(o instanceof String) {
1310 byte[] b = getNullTerminatedBytes((String)o);
1311 if(len < b.length) return -ENOMEM;
1313 copyout(b,oldp,len);
1314 memWrite(oldlenaddr,len);
1315 } else if(o instanceof Integer) {
1316 if(len < 4) return -ENOMEM;
1317 memWrite(oldp,((Integer)o).intValue());
1319 throw new Error("should never happen");
1324 public static final class GlobalState {
1325 Hashtable execCache = new Hashtable();
1327 final UnixRuntime[] tasks;
1330 /** Table of all current file locks held by this process. */
1331 Seekable.Lock[] locks = new Seekable.Lock[16];
1333 private MP[] mps = new MP[0];
1336 public GlobalState() { this(255); }
1337 public GlobalState(int maxProcs) { this(maxProcs,true); }
1338 public GlobalState(int maxProcs, boolean defaultMounts) {
1339 tasks = new UnixRuntime[maxProcs+1];
1342 if(Platform.getProperty("nestedvm.root") != null) {
1343 root = new File(Platform.getProperty("nestedvm.root"));
1344 if(!root.isDirectory()) throw new IllegalArgumentException("nestedvm.root is not a directory");
1346 String cwd = Platform.getProperty("user.dir");
1347 root = Platform.getRoot(new File(cwd != null ? cwd : "."));
1350 addMount("/",new HostFS(root));
1352 if(Platform.getProperty("nestedvm.root") == null) {
1353 File[] roots = Platform.listRoots();
1354 for(int i=0;i<roots.length;i++) {
1355 String name = roots[i].getPath();
1356 if(name.endsWith(File.separator))
1357 name = name.substring(0,name.length()-1);
1358 if(name.length() == 0 || name.indexOf('/') != -1) continue;
1359 addMount("/" + name.toLowerCase(),new HostFS(roots[i]));
1363 addMount("/dev",new DevFS());
1364 addMount("/resource",new ResourceFS());
1368 public String mapHostPath(String s) { return mapHostPath(new File(s)); }
1369 public String mapHostPath(File f) {
1372 synchronized(this) { mps = this.mps; root = this.root; }
1373 if(!f.isAbsolute()) f = new File(f.getAbsolutePath());
1374 for(int i=mps.length;i>=0;i--) {
1375 FS fs = i == mps.length ? root : mps[i].fs;
1376 String path = i == mps.length ? "" : mps[i].path;
1377 if(!(fs instanceof HostFS)) continue;
1378 File fsroot = ((HostFS)fs).getRoot();
1379 if(!fsroot.isAbsolute()) fsroot = new File(fsroot.getAbsolutePath());
1380 if(f.getPath().startsWith(fsroot.getPath())) {
1381 char sep = File.separatorChar;
1382 String child = f.getPath().substring(fsroot.getPath().length());
1384 char[] child_ = child.toCharArray();
1385 for(int j=0;j<child_.length;j++) {
1386 if(child_[j] == '/') child_[j] = sep;
1387 else if(child_[j] == sep) child_[j] = '/';
1389 child = new String(child_);
1391 String mapped = "/" + (path.length()==0?"":path+"/") + child;
1398 static class MP implements Sort.Comparable {
1399 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1402 public int compareTo(Object o) {
1403 if(!(o instanceof MP)) return 1;
1404 return -path.compareTo(((MP)o).path);
1408 public synchronized FS getMount(String path) {
1409 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1410 if(path.equals("/")) return root;
1411 path = path.substring(1);
1412 for(int i=0;i<mps.length;i++)
1413 if(mps[i].path.equals(path)) return mps[i].fs;
1417 public synchronized void addMount(String path, FS fs) {
1418 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1419 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1421 if(fs.owner != null) fs.owner.removeMount(fs);
1424 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1425 path = path.substring(1);
1426 int oldLength = mps.length;
1427 MP[] newMPS = new MP[oldLength + 1];
1428 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1429 newMPS[oldLength] = new MP(path,fs);
1433 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1434 fs.devno = highdevno + 2;
1437 public synchronized void removeMount(FS fs) {
1438 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1439 throw new IllegalArgumentException("mount point doesn't exist");
1442 public synchronized void removeMount(String path) {
1443 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1444 if(path.equals("/")) {
1447 path = path.substring(1);
1449 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1450 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1455 private void removeMount(int index) {
1456 if(index == -1) { root.owner = null; root = null; return; }
1457 MP[] newMPS = new MP[mps.length - 1];
1458 System.arraycopy(mps,0,newMPS,0,index);
1459 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1463 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1464 int pl = normalizedPath.length();
1467 synchronized(this) { list = mps; }
1468 for(int i=0;i<list.length;i++) {
1470 int mpl = mp.path.length();
1471 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1472 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1475 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1478 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1479 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1480 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1481 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1482 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1484 private static class CacheEnt {
1485 public final long time;
1486 public final long size;
1487 public final Object o;
1488 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1492 public abstract static class FS {
1493 static final int OPEN = 1;
1494 static final int STAT = 2;
1495 static final int LSTAT = 3;
1496 static final int MKDIR = 4;
1497 static final int UNLINK = 5;
1502 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1504 case OPEN: return open(r,path,arg1,arg2);
1505 case STAT: return stat(r,path);
1506 case LSTAT: return lstat(r,path);
1507 case MKDIR: mkdir(r,path,arg1); return null;
1508 case UNLINK: unlink(r,path); return null;
1509 default: throw new Error("should never happen");
1513 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1515 // If this returns null it'll be truned into an ENOENT
1516 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1517 // If this returns null it'll be turned into an ENOENT
1518 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1519 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1520 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1523 // chroot support should go in here if it is ever implemented
1524 private String normalizePath(String path) {
1525 boolean absolute = path.startsWith("/");
1526 int cwdl = cwd.length();
1528 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1529 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1530 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1532 char[] in = new char[path.length()+1];
1533 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1534 path.getChars(0,path.length(),in,0);
1538 do { inp++; } while(in[inp] == '/');
1539 } else if(cwdl != 0) {
1540 cwd.getChars(0,cwdl,out,0);
1544 while(in[inp] != 0) {
1546 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1547 if(in[inp] == '\0') break;
1548 while(in[inp] == '/') inp++;
1552 if(in[inp] == '\0') break;
1553 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1555 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1556 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1557 // Just read a /..{$,/}
1559 if(outp > 0) outp--;
1560 while(outp > 0 && out[outp] != '/') outp--;
1561 //System.err.println("After ..: " + new String(out,0,outp));
1564 // Just read a /.[^.] or /..[^/$]
1569 if(outp > 0 && out[outp-1] == '/') outp--;
1570 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1571 int outStart = out[0] == '/' ? 1 : 0;
1572 return new String(out,outStart,outp - outStart);
1575 FStat hostFStat(final File f, Object data) {
1578 FileInputStream fis = new FileInputStream(f);
1579 switch(fis.read()) {
1580 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1581 case '#': e = fis.read() == '!';
1584 } catch(IOException e2) { }
1585 HostFS fs = (HostFS) data;
1586 final int inode = fs.inodes.get(f.getAbsolutePath());
1587 final int devno = fs.devno;
1588 return new HostFStat(f,e) {
1589 public int inode() { return inode; }
1590 public int dev() { return devno; }
1594 FD hostFSDirFD(File f, Object _fs) {
1595 HostFS fs = (HostFS) _fs;
1596 return fs.new HostDirFD(f);
1599 public static class HostFS extends FS {
1600 InodeCache inodes = new InodeCache(4000);
1601 protected File root;
1602 public File getRoot() { return root; }
1604 private File hostFile(String path) {
1605 char sep = File.separatorChar;
1607 char buf[] = path.toCharArray();
1608 for(int i=0;i<buf.length;i++) {
1610 if(c == '/') buf[i] = sep;
1611 else if(c == sep) buf[i] = '/';
1613 path = new String(buf);
1615 return new File(root,path);
1618 public HostFS(String root) { this(new File(root)); }
1619 public HostFS(File root) { this.root = root; }
1621 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1622 final File f = hostFile(path);
1623 return r.hostFSOpen(f,flags,mode,this);
1626 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1627 File f = hostFile(path);
1628 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1629 if(!f.exists()) throw new ErrnoException(ENOENT);
1631 // Can't delete file immediately, so mark for
1632 // delete on close all matching FDs
1633 boolean marked = false;
1634 for(int i=0;i<OPEN_MAX;i++) {
1635 if(r.fds[i] != null) {
1636 String fdpath = r.fds[i].getNormalizedPath();
1637 if(fdpath != null && fdpath.equals(path)) {
1638 r.fds[i].markDeleteOnClose();
1643 if(!marked) throw new ErrnoException(EPERM);
1647 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1648 File f = hostFile(path);
1649 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1650 if(!f.exists()) return null;
1651 return r.hostFStat(f,this);
1654 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1655 File f = hostFile(path);
1656 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1657 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1658 if(f.exists()) throw new ErrnoException(ENOTDIR);
1659 File parent = getParentFile(f);
1660 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1661 if(!f.mkdir()) throw new ErrnoException(EIO);
1664 private static File getParentFile(File f) {
1665 String p = f.getParent();
1666 return p == null ? null : new File(p);
1669 public class HostDirFD extends DirFD {
1670 private final File f;
1671 private final File[] children;
1672 public HostDirFD(File f) {
1674 String[] l = f.list();
1675 children = new File[l.length];
1676 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1678 public int size() { return children.length; }
1679 public String name(int n) { return children[n].getName(); }
1680 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1681 public int parentInode() {
1682 File parent = getParentFile(f);
1683 // HACK: myInode() isn't really correct if we're not the root
1684 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1686 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1687 public int myDev() { return devno; }
1691 private static void putInt(byte[] buf, int off, int n) {
1692 buf[off+0] = (byte)((n>>>24)&0xff);
1693 buf[off+1] = (byte)((n>>>16)&0xff);
1694 buf[off+2] = (byte)((n>>> 8)&0xff);
1695 buf[off+3] = (byte)((n>>> 0)&0xff);
1698 public static abstract class DirFD extends FD {
1699 private int pos = -2;
1701 protected abstract int size();
1702 protected abstract String name(int n);
1703 protected abstract int inode(int n);
1704 protected abstract int myDev();
1705 protected abstract int parentInode();
1706 protected abstract int myInode();
1707 public int flags() { return O_RDONLY; }
1709 public int getdents(byte[] buf, int off, int len) {
1713 OUTER: for(;len > 0 && pos < size();pos++){
1717 ino = pos == -1 ? parentInode() : myInode();
1718 if(ino == -1) continue;
1719 reclen = 9 + (pos == -1 ? 2 : 1);
1720 if(reclen > len) break OUTER;
1722 if(pos == -1) buf[off+9] = '.';
1725 String f = name(pos);
1726 byte[] fb = getBytes(f);
1727 reclen = fb.length + 9;
1728 if(reclen > len) break OUTER;
1730 System.arraycopy(fb,0,buf,off+8,fb.length);
1733 buf[off+reclen-1] = 0; // null terminate
1734 reclen = (reclen + 3) & ~3; // add padding
1735 putInt(buf,off,reclen);
1736 putInt(buf,off+4,ino);
1743 protected FStat _fstat() {
1744 return new FStat() {
1745 public int type() { return S_IFDIR; }
1746 public int inode() { return myInode(); }
1747 public int dev() { return myDev(); }
1752 public static class DevFS extends FS {
1753 private static final int ROOT_INODE = 1;
1754 private static final int NULL_INODE = 2;
1755 private static final int ZERO_INODE = 3;
1756 private static final int FD_INODE = 4;
1757 private static final int FD_INODES = 32;
1759 private abstract class DevFStat extends FStat {
1760 public int dev() { return devno; }
1761 public int mode() { return 0666; }
1762 public int type() { return S_IFCHR; }
1763 public int nlink() { return 1; }
1764 public abstract int inode();
1767 private abstract class DevDirFD extends DirFD {
1768 public int myDev() { return devno; }
1771 private FD devZeroFD = new FD() {
1772 public int read(byte[] a, int off, int length) {
1773 /*Arrays.fill(a,off,off+length,(byte)0);*/
1774 for(int i=off;i<off+length;i++) a[i] = 0;
1777 public int write(byte[] a, int off, int length) { return length; }
1778 public int seek(int n, int whence) { return 0; }
1779 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1780 public int flags() { return O_RDWR; }
1782 private FD devNullFD = new FD() {
1783 public int read(byte[] a, int off, int length) { return 0; }
1784 public int write(byte[] a, int off, int length) { return length; }
1785 public int seek(int n, int whence) { return 0; }
1786 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1787 public int flags() { return O_RDWR; }
1790 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1791 if(path.equals("null")) return devNullFD;
1792 if(path.equals("zero")) return devZeroFD;
1793 if(path.startsWith("fd/")) {
1796 n = Integer.parseInt(path.substring(4));
1797 } catch(NumberFormatException e) {
1800 if(n < 0 || n >= OPEN_MAX) return null;
1801 if(r.fds[n] == null) return null;
1802 return r.fds[n].dup();
1804 if(path.equals("fd")) {
1806 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1807 final int[] files = new int[count];
1809 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1810 return new DevDirFD() {
1811 public int myInode() { return FD_INODE; }
1812 public int parentInode() { return ROOT_INODE; }
1813 public int inode(int n) { return FD_INODES + n; }
1814 public String name(int n) { return Integer.toString(files[n]); }
1815 public int size() { return files.length; }
1818 if(path.equals("")) {
1819 return new DevDirFD() {
1820 public int myInode() { return ROOT_INODE; }
1821 // HACK: We don't have any clean way to get the parent inode
1822 public int parentInode() { return ROOT_INODE; }
1823 public int inode(int n) {
1825 case 0: return NULL_INODE;
1826 case 1: return ZERO_INODE;
1827 case 2: return FD_INODE;
1832 public String name(int n) {
1834 case 0: return "null";
1835 case 1: return "zero";
1836 case 2: return "fd";
1837 default: return null;
1840 public int size() { return 3; }
1846 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1847 if(path.equals("null")) return devNullFD.fstat();
1848 if(path.equals("zero")) return devZeroFD.fstat();
1849 if(path.startsWith("fd/")) {
1852 n = Integer.parseInt(path.substring(3));
1853 } catch(NumberFormatException e) {
1856 if(n < 0 || n >= OPEN_MAX) return null;
1857 if(r.fds[n] == null) return null;
1858 return r.fds[n].fstat();
1860 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; }};
1861 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; }};
1865 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1866 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }
1870 public static class ResourceFS extends FS {
1871 final InodeCache inodes = new InodeCache(500);
1873 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1874 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1875 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }
1877 FStat connFStat(final URLConnection conn) {
1878 return new FStat() {
1879 public int type() { return S_IFREG; }
1880 public int nlink() { return 1; }
1881 public int mode() { return 0444; }
1882 public int size() { return conn.getContentLength(); }
1883 public int mtime() { return (int)(conn.getDate() / 1000); }
1884 public int inode() { return inodes.get(conn.getURL().toString()); }
1885 public int dev() { return devno; }
1889 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1890 URL url = r.getClass().getResource("/" + path);
1891 if(url == null) return null;
1893 return connFStat(url.openConnection());
1894 } catch(IOException e) {
1895 throw new ErrnoException(EIO);
1899 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1900 if((flags & ~3) != 0) {
1902 System.err.println("WARNING: Unsupported flags passed to ResourceFS.open(\"" + path + "\"): " + toHex(flags & ~3));
1903 throw new ErrnoException(ENOTSUP);
1905 if((flags&3) != RD_ONLY) throw new ErrnoException(EROFS);
1906 URL url = r.getClass().getResource("/" + path);
1907 if(url == null) return null;
1909 final URLConnection conn = url.openConnection();
1910 Seekable.InputStream si = new Seekable.InputStream(conn.getInputStream());
1911 return new SeekableFD(si,flags) { protected FStat _fstat() { return connFStat(conn); } };
1912 } catch(FileNotFoundException e) {
1913 if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) throw new ErrnoException(EACCES);
1915 } catch(IOException e) { throw new ErrnoException(EIO); }