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 return gs.open(this,normalizePath(path),flags,mode);
170 private int sys_getppid() {
171 return parent == null ? 1 : parent.pid;
174 private int sys_chown(int fileAddr, int uid, int gid) {
177 private int sys_lchown(int fileAddr, int uid, int gid) {
180 private int sys_fchown(int fd, int uid, int gid) {
183 private int sys_chmod(int fileAddr, int uid, int gid) {
186 private int sys_fchmod(int fd, int uid, int gid) {
189 private int sys_umask(int mask) {
193 private int sys_access(int cstring, int mode) throws ErrnoException, ReadFaultException {
194 // FEATURE: sys_access
195 return gs.stat(this,cstring(cstring)) == null ? -ENOENT : 0;
198 private int sys_realpath(int inAddr, int outAddr) throws FaultException {
199 String s = normalizePath(cstring(inAddr));
200 byte[] b = getNullTerminatedBytes(s);
201 if(b.length > PATH_MAX) return -ERANGE;
202 copyout(b,outAddr,b.length);
206 // FEATURE: Signal handling
207 // check flag only on backwards jumps to basic blocks without compulsatory checks
208 // (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
210 /** The kill syscall.
211 SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
212 SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
213 Anything else terminates the process. */
214 private int sys_kill(int pid, int signal) {
215 // This will only be called by raise() in newlib to invoke the default handler
216 // We don't have to worry about actually delivering the signal
217 if(pid != pid) return -ESRCH;
218 if(signal < 0 || signal >= 32) return -EINVAL;
231 exit(128+signal, true);
236 private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
237 final int WNOHANG = 1;
238 if((options & ~(WNOHANG)) != 0) return -EINVAL;
239 if(pid == 0 || pid < -1) {
240 if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
243 boolean blocking = (options&WNOHANG)==0;
245 if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
246 if(children == null) return blocking ? -ECHILD : 0;
248 UnixRuntime done = null;
250 synchronized(children) {
253 if(exitedChildren.size() > 0) {
254 done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
255 exitedChildren.removeElementAt(exitedChildren.size() - 1);
258 if(pid >= gs.tasks.length) return -ECHILD;
259 UnixRuntime t = gs.tasks[pid];
260 if(t.parent != this) return -ECHILD;
261 if(t.state == EXITED) {
262 if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
266 // process group stuff, EINVAL returned above
267 throw new Error("should never happen");
270 if(!blocking) return 0;
271 try { children.wait(); } catch(InterruptedException e) {}
272 //System.err.println("waitpid woke up: " + exitedChildren.size());
274 gs.tasks[done.pid] = null;
279 if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
285 if(children != null) synchronized(children) {
286 for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
287 UnixRuntime child = (UnixRuntime) e.nextElement();
288 gs.tasks[child.pid] = null;
290 exitedChildren.removeAllElements();
291 for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
292 UnixRuntime child = (UnixRuntime) e.nextElement();
295 activeChildren.removeAllElements();
298 UnixRuntime _parent = parent;
299 if(_parent == null) {
300 gs.tasks[pid] = null;
302 synchronized(_parent.children) {
304 gs.tasks[pid] = null;
306 if(!parent.activeChildren.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
307 parent.exitedChildren.addElement(this);
308 parent.children.notify();
314 protected Object clone() throws CloneNotSupportedException {
315 UnixRuntime r = (UnixRuntime) super.clone();
319 r.activeChildren = r.exitedChildren = null;
323 private int sys_fork() {
327 r = (UnixRuntime) clone();
328 } catch(Exception e) {
337 } catch(ProcessTableFullExn e) {
341 //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
342 if(children == null) {
343 children = new Object();
344 activeChildren = new Vector();
345 exitedChildren = new Vector();
347 activeChildren.addElement(r);
349 CPUState state = new CPUState();
351 state.r[V0] = 0; // return 0 to child
352 state.pc += 4; // skip over syscall instruction
353 r.setCPUState(state);
356 new ForkedProcess(r);
361 public static final class ForkedProcess extends Thread {
362 private final UnixRuntime initial;
363 public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
364 public void run() { UnixRuntime.executeAndExec(initial); }
367 public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
368 public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
370 public static int executeAndExec(UnixRuntime r) {
373 if(r.execute()) break;
374 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
376 if(r.state != EXECED) return r.exitStatus();
381 private String[] readStringArray(int addr) throws ReadFaultException {
383 for(int p=addr;memRead(p) != 0;p+=4) count++;
384 String[] a = new String[count];
385 for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
389 private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
390 return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
393 private final static Method runtimeCompilerCompile;
397 m = Class.forName("org.ibex.nestedvm.RuntimeCompiler").getMethod("compile",new Class[]{Seekable.class,String.class,String.class});
398 } catch(NoSuchMethodException e) {
400 } catch(ClassNotFoundException e) {
403 runtimeCompilerCompile = m;
406 public Class runtimeCompile(Seekable s, String sourceName) throws IOException {
407 if(runtimeCompilerCompile == null) {
408 if(STDERR_DIAG) System.err.println("WARNING: Exec attempted but RuntimeCompiler not found!");
413 return (Class) runtimeCompilerCompile.invoke(null,new Object[]{s,"unixruntime,maxinsnpermethod=256,lessconstants",sourceName});
414 } catch(IllegalAccessException e) {
417 } catch(InvocationTargetException e) {
418 Throwable t = e.getTargetException();
419 if(t instanceof IOException) throw (IOException) t;
420 if(t instanceof RuntimeException) throw (RuntimeException) t;
421 if(t instanceof Error) throw (Error) t;
422 if(STDERR_DIAG) t.printStackTrace();
427 private int exec(String path, String[] argv, String[] envp) throws ErrnoException {
428 if(argv.length == 0) argv = new String[]{""};
429 // HACK: Hideous hack to make a standalone busybox possible
430 if(path.equals("bin/busybox") && getClass().getName().endsWith("BusyBox"))
431 return execClass(getClass(),argv,envp);
433 // NOTE: For this little hack to work nestedvm.root MUST be "."
435 System.err.println("Execing normalized path: " + normalizedPath);
436 if(true) return exec(new Interpreter(normalizedPath),argv,envp);
437 } catch(IOException e) { throw new Error(e); }*/
439 FStat fstat = gs.stat(this,path);
440 if(fstat == null) return -ENOENT;
441 GlobalState.CacheEnt ent = (GlobalState.CacheEnt) gs.execCache.get(path);
442 long mtime = fstat.mtime();
443 long size = fstat.size();
445 //System.err.println("Found cached entry for " + path);
446 if(ent.time ==mtime && ent.size == size) {
447 if(ent.o instanceof Class)
448 return execClass((Class) ent.o,argv,envp);
449 if(ent.o instanceof String[])
450 return execScript(path,(String[]) ent.o,argv,envp);
451 throw new Error("should never happen");
453 //System.err.println("Cache was out of date");
454 gs.execCache.remove(path);
457 FD fd = gs.open(this,path,RD_ONLY,0);
458 if(fd == null) throw new ErrnoException(ENOENT);
459 Seekable s = fd.seekable();
460 if(s == null) throw new ErrnoException(EACCES);
462 byte[] buf = new byte[4096];
465 int n = s.read(buf,0,buf.length);
466 if(n == -1) throw new ErrnoException(ENOEXEC);
469 case '\177': // possible ELF
470 if(n < 4) s.tryReadFully(buf,n,4-n);
471 if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') return -ENOEXEC;
473 if(STDERR_DIAG) System.err.println("Running RuntimeCompiler for " + path);
474 Class c = runtimeCompile(s,path);
475 if(STDERR_DIAG) System.err.println("RuntimeCompiler finished for " + path);
476 if(c == null) throw new ErrnoException(ENOEXEC);
477 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
478 return execClass(c,argv,envp);
481 int n2 = s.read(buf,1,buf.length-1);
482 if(n2 == -1) return -ENOEXEC;
485 if(buf[1] != '!') return -ENOEXEC;
489 for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
491 if(p == buf.length) break OUTER;
492 n = s.read(buf,p,buf.length-p);
495 for(;cmdStart<p;cmdStart++) if(buf[cmdStart]!=' ') break;
496 if(cmdStart == p) throw new ErrnoException(ENOEXEC);
497 int argStart = cmdStart;
498 for(;argStart<p;argStart++) if(buf[argStart] == ' ') break;
499 int cmdEnd = argStart;
500 while(argStart < p && buf[argStart] == ' ') argStart++;
501 String[] command = new String[] {
502 new String(buf,cmdStart,cmdEnd-cmdStart),
503 argStart < p ? new String(buf,argStart,p-argStart) : null
505 gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
506 return execScript(path,command,argv,envp);
510 } catch(IOException e) {
517 public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
518 String[] newArgv = new String[argv.length-1 + (command[1] != null ? 3 : 2)];
519 int p = command[0].lastIndexOf('/');
520 newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
521 newArgv[1] = "/" + path;
523 if(command[1] != null) newArgv[p++] = command[1];
524 for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
525 if(p != newArgv.length) throw new Error("p != newArgv.length");
526 System.err.println("Execing: " + command[0]);
527 for(int i=0;i<newArgv.length;i++) System.err.println("execing [" + i + "] " + newArgv[i]);
528 return exec(command[0],newArgv,envp);
531 public int execClass(Class c,String[] argv, String[] envp) {
533 UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[]{Boolean.TYPE}).newInstance(new Object[]{Boolean.TRUE});
534 return exec(r,argv,envp);
535 } catch(Exception e) {
541 private int exec(UnixRuntime r, String[] argv, String[] envp) {
542 //System.err.println("Execing " + r);
543 for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
545 r.closeOnExec = closeOnExec;
546 // make sure this doesn't get messed with these since we didn't copy them
564 private final byte[] pipebuf = new byte[PIPE_BUF*4];
566 private int writePos;
568 public final FD reader = new Reader();
569 public final FD writer = new Writer();
571 public class Reader extends FD {
572 protected FStat _fstat() { return new SocketFStat(); }
573 public int read(byte[] buf, int off, int len) throws ErrnoException {
574 if(len == 0) return 0;
575 synchronized(Pipe.this) {
576 while(writePos != -1 && readPos == writePos) {
577 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
579 if(writePos == -1) return 0; // eof
580 len = Math.min(len,writePos-readPos);
581 System.arraycopy(pipebuf,readPos,buf,off,len);
583 if(readPos == writePos) Pipe.this.notify();
587 public int flags() { return O_RDONLY; }
588 public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
591 public class Writer extends FD {
592 protected FStat _fstat() { return new SocketFStat(); }
593 public int write(byte[] buf, int off, int len) throws ErrnoException {
594 if(len == 0) return 0;
595 synchronized(Pipe.this) {
596 if(readPos == -1) throw new ErrnoException(EPIPE);
597 if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
598 // not enough space to atomicly write the data
599 while(readPos != -1 && readPos != writePos) {
600 try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
602 if(readPos == -1) throw new ErrnoException(EPIPE);
603 readPos = writePos = 0;
605 len = Math.min(len,pipebuf.length - writePos);
606 System.arraycopy(buf,off,pipebuf,writePos,len);
607 if(readPos == writePos) Pipe.this.notify();
612 public int flags() { return O_WRONLY; }
613 public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
617 private int sys_pipe(int addr) {
618 Pipe pipe = new Pipe();
620 int fd1 = addFD(pipe.reader);
621 if(fd1 < 0) return -ENFILE;
622 int fd2 = addFD(pipe.writer);
623 if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
627 memWrite(addr+4,fd2);
628 } catch(FaultException e) {
636 private int sys_dup2(int oldd, int newd) {
637 if(oldd == newd) return 0;
638 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
639 if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
640 if(fds[oldd] == null) return -EBADFD;
641 if(fds[newd] != null) fds[newd].close();
642 fds[newd] = fds[oldd].dup();
646 private int sys_dup(int oldd) {
647 if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
648 if(fds[oldd] == null) return -EBADFD;
649 FD fd = fds[oldd].dup();
650 int newd = addFD(fd);
651 if(newd < 0) { fd.close(); return -ENFILE; }
655 private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
656 FStat s = gs.stat(this,normalizePath(cstring(cstring)));
657 if(s == null) return -ENOENT;
661 private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
662 FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
663 if(s == null) return -ENOENT;
667 private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
668 gs.mkdir(this,normalizePath(cstring(cstring)),mode);
672 private int sys_unlink(int cstring) throws FaultException, ErrnoException {
673 gs.unlink(this,normalizePath(cstring(cstring)));
677 private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
678 byte[] b = getBytes(cwd);
679 if(size == 0) return -EINVAL;
680 if(size < b.length+2) return -ERANGE;
682 copyout(b,addr+1,b.length);
683 memset(addr+b.length+1,0,1);
687 private int sys_chdir(int addr) throws ErrnoException, FaultException {
688 String path = normalizePath(cstring(addr));
689 FStat st = gs.stat(this,path);
690 if(st == null) return -ENOENT;
691 if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
696 private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
697 count = Math.min(count,MAX_CHUNK);
698 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
699 if(fds[fdn] == null) return -EBADFD;
700 byte[] buf = byteBuf(count);
701 int n = fds[fdn].getdents(buf,0,count);
706 void _closedFD(FD fd) {
707 // release all fcntl locks on this file
708 Seekable s = fd.seekable();
709 if (s == null) return;
712 for (int i=0; i < gs.locks.length; i++) {
713 Seekable.Lock l = gs.locks[i];
714 if (l == null) continue;
715 if (s.equals(l.seekable()) && l.getOwner() == this) {
720 } catch (IOException e) { throw new RuntimeException(e); }
723 /** Implements the F_GETLK and F_SETLK cases of fcntl syscall.
724 * If l_start = 0 and l_len = 0 the lock refers to the entire file.
725 * Uses GlobalState to ensure locking across processes in the same JVM.
727 short l_type; // lock type: F_UNLCK, F_RDLCK, F_WRLCK
728 short l_whence; // type of l_start: SEEK_SET, SEEK_CUR, SEEK_END
729 long l_start; // starting offset, bytes
730 long l_len; // len = 0 means until EOF
731 short l_pid; // lock owner
732 short l_xxx; // padding
735 private int sys_fcntl_lock(int fdn, int cmd, int arg) throws FaultException{
736 if (cmd != F_GETLK && cmd != F_SETLK) return sys_fcntl(fdn, cmd, arg);
738 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
739 if(fds[fdn] == null) return -EBADFD;
742 if (arg == 0) return -EINVAL;
743 int word = memRead(arg);
744 int l_start = memRead(arg+4);
745 int l_len = memRead(arg+8);
746 int l_type = word>>16;
747 int l_whence = word&0x00ff;
749 Seekable.Lock[] locks = gs.locks;
750 Seekable s = fd.seekable();
751 if (s == null) return -EINVAL;
756 case SEEK_SET: break;
757 case SEEK_CUR: l_start += s.pos(); break;
758 case SEEK_END: l_start += s.length(); break;
762 if (cmd == F_GETLK) {
763 // The simple Java file locking below will happily return
764 // a lock that overlaps one already held by the JVM. Thus
765 // we must check over all the locks held by other Runtimes
766 for (int i=0; i < locks.length; i++) {
767 if (locks[i] == null || !s.equals(locks[i].seekable()))
769 if (!locks[i].overlaps(l_start, l_len))
771 if (locks[i].getOwner() == this)
773 if (locks[i].isShared() && l_type == F_RDLCK)
776 // overlapping lock held by another process
780 // check if an area is lockable by attempting to obtain a lock
781 Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
783 if (lock != null) { // no lock exists
784 memWrite(arg, SEEK_SET|(F_UNLCK<<16));
791 // now processing F_SETLK
792 if (cmd != F_SETLK) return -EINVAL;
794 if (l_type == F_UNLCK) {
795 // release all locks that fall within the boundaries given
796 for (int i=0; i < locks.length; i++) {
797 if (locks[i] == null || !s.equals(locks[i].seekable()))
799 if (locks[i].getOwner() != this) continue;
801 int pos = (int)locks[i].position();
802 if (pos < l_start) continue;
803 if (l_start != 0 && l_len != 0) // start/len 0 means unlock all
804 if (pos + locks[i].size() > l_start + l_len)
812 } else if (l_type == F_RDLCK || l_type == F_WRLCK) {
813 // first see if a lock already exists
814 for (int i=0; i < locks.length; i++) {
815 if (locks[i] == null || !s.equals(locks[i].seekable()))
818 if (locks[i].getOwner() == this) {
819 // if this Runtime owns an overlapping lock work with it
820 if (locks[i].contained(l_start, l_len)) {
823 } else if (locks[i].contains(l_start, l_len)) {
824 if (locks[i].isShared() == (l_type == F_RDLCK)) {
825 // return this more general lock
826 memWrite(arg+4, (int)locks[i].position());
827 memWrite(arg+8, (int)locks[i].size());
835 // if another Runtime has an lock and it is exclusive or
836 // we want an exclusive lock then fail
837 if (locks[i].overlaps(l_start, l_len)
838 && (!locks[i].isShared() || l_type == F_WRLCK))
844 Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
845 if (lock == null) return -EAGAIN;
849 for (i=0; i < locks.length; i++)
850 if (locks[i] == null) break;
851 if (i == locks.length) return -ENOLCK;
859 } catch (IOException e) { throw new RuntimeException(e); }
862 static class SocketFD extends FD {
863 public static final int TYPE_STREAM = 0;
864 public static final int TYPE_DGRAM = 1;
865 public static final int LISTEN = 2;
866 public int type() { return flags & 1; }
867 public boolean listen() { return (flags & 2) != 0; }
876 InetAddress bindAddr;
878 InetAddress connectAddr;
879 int connectPort = -1;
885 private static final byte[] EMPTY = new byte[0];
886 public SocketFD(int type) {
888 if(type == TYPE_DGRAM)
889 dp = new DatagramPacket(EMPTY,0);
892 public void setOptions() {
894 if(s != null && type() == TYPE_STREAM && !listen()) {
895 Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
897 } catch(SocketException e) {
898 if(STDERR_DIAG) e.printStackTrace();
902 public void _close() {
904 if(s != null) s.close();
905 if(ss != null) ss.close();
906 if(ds != null) ds.close();
907 } catch(IOException e) {
912 public int read(byte[] a, int off, int length) throws ErrnoException {
913 if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
914 if(is == null) throw new ErrnoException(EPIPE);
916 int n = is.read(a,off,length);
917 return n < 0 ? 0 : n;
918 } catch(IOException e) {
919 throw new ErrnoException(EIO);
923 public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
924 if(type() == TYPE_STREAM) return read(a,off,length);
926 if(off != 0) throw new IllegalArgumentException("off must be 0");
928 dp.setLength(length);
930 if(ds == null) ds = new DatagramSocket();
932 } catch(IOException e) {
933 if(STDERR_DIAG) e.printStackTrace();
934 throw new ErrnoException(EIO);
936 if(sockAddr != null) {
937 sockAddr[0] = dp.getAddress();
938 port[0] = dp.getPort();
940 return dp.getLength();
943 public int write(byte[] a, int off, int length) throws ErrnoException {
944 if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
946 if(os == null) throw new ErrnoException(EPIPE);
948 os.write(a,off,length);
950 } catch(IOException e) {
951 throw new ErrnoException(EIO);
955 public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
956 if(off != 0) throw new IllegalArgumentException("off must be 0");
957 if(type() == TYPE_STREAM) return write(a,off,length);
959 if(destAddr == null) {
960 destAddr = connectAddr;
961 destPort = connectPort;
963 if(destAddr == null) throw new ErrnoException(ENOTCONN);
966 dp.setAddress(destAddr);
967 dp.setPort(destPort);
969 dp.setLength(length);
972 if(ds == null) ds = new DatagramSocket();
974 } catch(IOException e) {
975 if(STDERR_DIAG) e.printStackTrace();
976 if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
977 throw new ErrnoException(EIO);
979 return dp.getLength();
982 public int flags() { return O_RDWR; }
983 public FStat _fstat() { return new SocketFStat(); }
986 private int sys_socket(int domain, int type, int proto) {
987 if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
988 return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
991 private SocketFD getSocketFD(int fdn) throws ErrnoException {
992 if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
993 if(fds[fdn] == null) throw new ErrnoException(EBADFD);
994 if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
996 return (SocketFD) fds[fdn];
999 private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
1000 SocketFD fd = getSocketFD(fdn);
1002 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
1003 int word1 = memRead(addr);
1004 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1005 int port = word1 & 0xffff;
1006 byte[] ip = new byte[4];
1007 copyin(addr+4,ip,4);
1009 InetAddress inetAddr;
1011 inetAddr = Platform.inetAddressFromBytes(ip);
1012 } catch(UnknownHostException e) {
1013 return -EADDRNOTAVAIL;
1016 fd.connectAddr = inetAddr;
1017 fd.connectPort = port;
1021 case SocketFD.TYPE_STREAM: {
1022 Socket s = new Socket(inetAddr,port);
1025 fd.is = s.getInputStream();
1026 fd.os = s.getOutputStream();
1029 case SocketFD.TYPE_DGRAM:
1032 throw new Error("should never happen");
1034 } catch(IOException e) {
1035 return -ECONNREFUSED;
1041 private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
1042 String hostname = cstring(chostname);
1043 int size = memRead(sizeAddr);
1044 InetAddress[] inetAddrs;
1046 inetAddrs = InetAddress.getAllByName(hostname);
1047 } catch(UnknownHostException e) {
1048 return HOST_NOT_FOUND;
1050 int count = min(size/4,inetAddrs.length);
1051 for(int i=0;i<count;i++,addr+=4) {
1052 byte[] b = inetAddrs[i].getAddress();
1055 memWrite(sizeAddr,count*4);
1059 private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
1060 SocketFD fd = getSocketFD(fdn);
1065 case SO_KEEPALIVE: {
1066 if(len != 4) return -EINVAL;
1067 int val = memRead(valaddr);
1068 if(val != 0) fd.options |= name;
1069 else fd.options &= ~name;
1074 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
1075 return -ENOPROTOOPT;
1078 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
1079 return -ENOPROTOOPT;
1083 private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
1084 SocketFD fd = getSocketFD(fdn);
1089 case SO_KEEPALIVE: {
1090 int len = memRead(lenaddr);
1091 if(len < 4) return -EINVAL;
1092 int val = (fd.options & name) != 0 ? 1 : 0;
1093 memWrite(valaddr,val);
1094 memWrite(lenaddr,4);
1098 if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
1099 return -ENOPROTOOPT;
1102 if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
1103 return -ENOPROTOOPT;
1107 private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
1108 SocketFD fd = getSocketFD(fdn);
1110 if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
1111 int word1 = memRead(addr);
1112 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1113 int port = word1 & 0xffff;
1114 InetAddress inetAddr = null;
1115 if(memRead(addr+4) != 0) {
1116 byte[] ip = new byte[4];
1117 copyin(addr+4,ip,4);
1120 inetAddr = Platform.inetAddressFromBytes(ip);
1121 } catch(UnknownHostException e) {
1122 return -EADDRNOTAVAIL;
1127 case SocketFD.TYPE_STREAM: {
1128 fd.bindAddr = inetAddr;
1132 case SocketFD.TYPE_DGRAM: {
1133 if(fd.ds != null) fd.ds.close();
1135 fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
1136 } catch(IOException e) {
1142 throw new Error("should never happen");
1146 private int sys_listen(int fdn, int backlog) throws ErrnoException {
1147 SocketFD fd = getSocketFD(fdn);
1148 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1149 if(fd.ss != null || fd.s != null) return -EISCONN;
1150 if(fd.bindPort < 0) return -EOPNOTSUPP;
1153 fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
1154 fd.flags |= SocketFD.LISTEN;
1156 } catch(IOException e) {
1162 private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
1163 SocketFD fd = getSocketFD(fdn);
1164 if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
1165 if(!fd.listen()) return -EOPNOTSUPP;
1167 int size = memRead(lenaddr);
1169 ServerSocket s = fd.ss;
1172 client = s.accept();
1173 } catch(IOException e) {
1178 memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
1179 byte[] b = client.getInetAddress().getAddress();
1180 copyout(b,addr+4,4);
1181 memWrite(lenaddr,8);
1184 SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
1185 clientFD.s = client;
1187 clientFD.is = client.getInputStream();
1188 clientFD.os = client.getOutputStream();
1189 } catch(IOException e) {
1192 int n = addFD(clientFD);
1193 if(n == -1) { clientFD.close(); return -ENFILE; }
1197 private int sys_shutdown(int fdn, int how) throws ErrnoException {
1198 SocketFD fd = getSocketFD(fdn);
1199 if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
1200 if(fd.s == null) return -ENOTCONN;
1205 if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
1206 if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
1207 } catch(IOException e) {
1214 private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
1215 SocketFD fd = getSocketFD(fdn);
1216 if(flags != 0) throw new ErrnoException(EINVAL);
1218 int word1 = memRead(destAddr);
1219 if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
1220 int port = word1 & 0xffff;
1221 InetAddress inetAddr;
1222 byte[] ip = new byte[4];
1223 copyin(destAddr+4,ip,4);
1225 inetAddr = Platform.inetAddressFromBytes(ip);
1226 } catch(UnknownHostException e) {
1227 return -EADDRNOTAVAIL;
1230 count = Math.min(count,MAX_CHUNK);
1231 byte[] buf = byteBuf(count);
1232 copyin(addr,buf,count);
1234 return fd.sendto(buf,0,count,inetAddr,port);
1235 } catch(ErrnoException e) {
1236 if(e.errno == EPIPE) exit(128+13,true);
1241 private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
1242 SocketFD fd = getSocketFD(fdn);
1243 if(flags != 0) throw new ErrnoException(EINVAL);
1245 InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
1246 int[] port = sourceAddr == 0 ? null : new int[1];
1248 count = Math.min(count,MAX_CHUNK);
1249 byte[] buf = byteBuf(count);
1250 int n = fd.recvfrom(buf,0,count,inetAddr,port);
1251 copyout(buf,addr,n);
1253 if(sourceAddr != 0) {
1254 memWrite(sourceAddr,(AF_INET << 16) | port[0]);
1255 byte[] ip = inetAddr[0].getAddress();
1256 copyout(ip,sourceAddr+4,4);
1262 private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
1266 private static String hostName() {
1268 return InetAddress.getLocalHost().getHostName();
1269 } catch(UnknownHostException e) {
1274 private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
1275 if(newp != 0) return -EPERM;
1276 if(namelen == 0) return -ENOENT;
1277 if(oldp == 0) return 0;
1280 switch(memRead(nameaddr)) {
1282 if(namelen != 2) break;
1283 switch(memRead(nameaddr+4)) {
1284 case KERN_OSTYPE: o = "NestedVM"; break;
1285 case KERN_HOSTNAME: o = hostName(); break;
1286 case KERN_OSRELEASE: o = VERSION; break;
1287 case KERN_VERSION: o = "NestedVM Kernel Version " + VERSION; break;
1291 if(namelen != 2) break;
1292 switch(memRead(nameaddr+4)) {
1293 case HW_MACHINE: o = "NestedVM Virtual Machine"; break;
1297 if(o == null) return -ENOENT;
1298 int len = memRead(oldlenaddr);
1299 if(o instanceof String) {
1300 byte[] b = getNullTerminatedBytes((String)o);
1301 if(len < b.length) return -ENOMEM;
1303 copyout(b,oldp,len);
1304 memWrite(oldlenaddr,len);
1305 } else if(o instanceof Integer) {
1306 if(len < 4) return -ENOMEM;
1307 memWrite(oldp,((Integer)o).intValue());
1309 throw new Error("should never happen");
1314 public static final class GlobalState {
1315 Hashtable execCache = new Hashtable();
1317 final UnixRuntime[] tasks;
1320 /** Table of all current file locks held by this process. */
1321 Seekable.Lock[] locks = new Seekable.Lock[16];
1323 private MP[] mps = new MP[0];
1326 public GlobalState() { this(255); }
1327 public GlobalState(int maxProcs) { this(maxProcs,true); }
1328 public GlobalState(int maxProcs, boolean defaultMounts) {
1329 tasks = new UnixRuntime[maxProcs+1];
1332 if(Platform.getProperty("nestedvm.root") != null) {
1333 root = new File(Platform.getProperty("nestedvm.root"));
1334 if(!root.isDirectory()) throw new IllegalArgumentException("nestedvm.root is not a directory");
1336 String cwd = Platform.getProperty("user.dir");
1337 root = Platform.getRoot(new File(cwd != null ? cwd : "."));
1340 addMount("/",new HostFS(root));
1342 if(Platform.getProperty("nestedvm.root") == null) {
1343 File[] roots = Platform.listRoots();
1344 for(int i=0;i<roots.length;i++) {
1345 String name = roots[i].getPath();
1346 if(name.endsWith(File.separator))
1347 name = name.substring(0,name.length()-1);
1348 if(name.length() == 0 || name.indexOf('/') != -1) continue;
1349 addMount("/" + name.toLowerCase(),new HostFS(roots[i]));
1353 addMount("/dev",new DevFS());
1354 addMount("/resource",new ResourceFS());
1358 public String mapHostPath(String s) { return mapHostPath(new File(s)); }
1359 public String mapHostPath(File f) {
1362 synchronized(this) { mps = this.mps; root = this.root; }
1363 if(!f.isAbsolute()) f = new File(f.getAbsolutePath());
1364 for(int i=mps.length;i>=0;i--) {
1365 FS fs = i == mps.length ? root : mps[i].fs;
1366 String path = i == mps.length ? "" : mps[i].path;
1367 if(!(fs instanceof HostFS)) continue;
1368 File fsroot = ((HostFS)fs).getRoot();
1369 if(!fsroot.isAbsolute()) fsroot = new File(fsroot.getAbsolutePath());
1370 if(f.getPath().startsWith(fsroot.getPath())) {
1371 char sep = File.separatorChar;
1372 String child = f.getPath().substring(fsroot.getPath().length());
1374 char[] child_ = child.toCharArray();
1375 for(int j=0;j<child_.length;j++) {
1376 if(child_[j] == '/') child_[j] = sep;
1377 else if(child_[j] == sep) child_[j] = '/';
1379 child = new String(child_);
1381 String mapped = "/" + (path.length()==0?"":path+"/") + child;
1388 static class MP implements Sort.Comparable {
1389 public MP(String path, FS fs) { this.path = path; this.fs = fs; }
1392 public int compareTo(Object o) {
1393 if(!(o instanceof MP)) return 1;
1394 return -path.compareTo(((MP)o).path);
1398 public synchronized FS getMount(String path) {
1399 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1400 if(path.equals("/")) return root;
1401 path = path.substring(1);
1402 for(int i=0;i<mps.length;i++)
1403 if(mps[i].path.equals(path)) return mps[i].fs;
1407 public synchronized void addMount(String path, FS fs) {
1408 if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
1409 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1411 if(fs.owner != null) fs.owner.removeMount(fs);
1414 if(path.equals("/")) { root = fs; fs.devno = 1; return; }
1415 path = path.substring(1);
1416 int oldLength = mps.length;
1417 MP[] newMPS = new MP[oldLength + 1];
1418 if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
1419 newMPS[oldLength] = new MP(path,fs);
1423 for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
1424 fs.devno = highdevno + 2;
1427 public synchronized void removeMount(FS fs) {
1428 for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
1429 throw new IllegalArgumentException("mount point doesn't exist");
1432 public synchronized void removeMount(String path) {
1433 if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
1434 if(path.equals("/")) {
1437 path = path.substring(1);
1439 for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
1440 if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
1445 private void removeMount(int index) {
1446 if(index == -1) { root.owner = null; root = null; return; }
1447 MP[] newMPS = new MP[mps.length - 1];
1448 System.arraycopy(mps,0,newMPS,0,index);
1449 System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
1453 private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
1454 int pl = normalizedPath.length();
1457 synchronized(this) { list = mps; }
1458 for(int i=0;i<list.length;i++) {
1460 int mpl = mp.path.length();
1461 if(normalizedPath.startsWith(mp.path) && (pl == mpl || normalizedPath.charAt(mpl) == '/'))
1462 return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
1465 return root.dispatch(op,r,normalizedPath,arg1,arg2);
1468 public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(FS.OPEN,r,path,flags,mode); }
1469 public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.STAT,r,path,0,0); }
1470 public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(FS.LSTAT,r,path,0,0); }
1471 public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(FS.MKDIR,r,path,mode,0); }
1472 public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(FS.UNLINK,r,path,0,0); }
1474 private static class CacheEnt {
1475 public final long time;
1476 public final long size;
1477 public final Object o;
1478 public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
1482 public abstract static class FS {
1483 static final int OPEN = 1;
1484 static final int STAT = 2;
1485 static final int LSTAT = 3;
1486 static final int MKDIR = 4;
1487 static final int UNLINK = 5;
1492 Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
1494 case OPEN: return open(r,path,arg1,arg2);
1495 case STAT: return stat(r,path);
1496 case LSTAT: return lstat(r,path);
1497 case MKDIR: mkdir(r,path,arg1); return null;
1498 case UNLINK: unlink(r,path); return null;
1499 default: throw new Error("should never happen");
1503 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1505 // If this returns null it'll be truned into an ENOENT
1506 public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
1507 // If this returns null it'll be turned into an ENOENT
1508 public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
1509 public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
1510 public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
1513 // chroot support should go in here if it is ever implemented
1514 private String normalizePath(String path) {
1515 boolean absolute = path.startsWith("/");
1516 int cwdl = cwd.length();
1518 // NOTE: This isn't just a fast path, it handles cases the code below doesn't
1519 if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
1520 return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
1522 char[] in = new char[path.length()+1];
1523 char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
1524 path.getChars(0,path.length(),in,0);
1528 do { inp++; } while(in[inp] == '/');
1529 } else if(cwdl != 0) {
1530 cwd.getChars(0,cwdl,out,0);
1534 while(in[inp] != 0) {
1536 while(in[inp] != 0 && in[inp] != '/') { out[outp++] = in[inp++]; }
1537 if(in[inp] == '\0') break;
1538 while(in[inp] == '/') inp++;
1542 if(in[inp] == '\0') break;
1543 if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
1545 if(in[inp+1] == '\0' || in[inp+1] == '/') { inp++; continue; }
1546 if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
1547 // Just read a /..{$,/}
1549 if(outp > 0) outp--;
1550 while(outp > 0 && out[outp] != '/') outp--;
1551 //System.err.println("After ..: " + new String(out,0,outp));
1554 // Just read a /.[^.] or /..[^/$]
1559 if(outp > 0 && out[outp-1] == '/') outp--;
1560 //System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
1561 int outStart = out[0] == '/' ? 1 : 0;
1562 return new String(out,outStart,outp - outStart);
1565 FStat hostFStat(final File f, Object data) {
1568 FileInputStream fis = new FileInputStream(f);
1569 switch(fis.read()) {
1570 case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
1571 case '#': e = fis.read() == '!';
1574 } catch(IOException e2) { }
1575 HostFS fs = (HostFS) data;
1576 final int inode = fs.inodes.get(f.getAbsolutePath());
1577 final int devno = fs.devno;
1578 return new HostFStat(f,e) {
1579 public int inode() { return inode; }
1580 public int dev() { return devno; }
1584 FD hostFSDirFD(File f, Object _fs) {
1585 HostFS fs = (HostFS) _fs;
1586 return fs.new HostDirFD(f);
1589 public static class HostFS extends FS {
1590 InodeCache inodes = new InodeCache(4000);
1591 protected File root;
1592 public File getRoot() { return root; }
1594 private File hostFile(String path) {
1595 char sep = File.separatorChar;
1597 char buf[] = path.toCharArray();
1598 for(int i=0;i<buf.length;i++) {
1600 if(c == '/') buf[i] = sep;
1601 else if(c == sep) buf[i] = '/';
1603 path = new String(buf);
1605 return new File(root,path);
1608 public HostFS(String root) { this(new File(root)); }
1609 public HostFS(File root) { this.root = root; }
1611 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1612 final File f = hostFile(path);
1613 return r.hostFSOpen(f,flags,mode,this);
1616 public void unlink(UnixRuntime r, String path) throws ErrnoException {
1617 File f = hostFile(path);
1618 if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
1619 if(!f.exists()) throw new ErrnoException(ENOENT);
1620 if(!f.delete()) throw new ErrnoException(EPERM);
1623 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1624 File f = hostFile(path);
1625 if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
1626 if(!f.exists()) return null;
1627 return r.hostFStat(f,this);
1630 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
1631 File f = hostFile(path);
1632 if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
1633 if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
1634 if(f.exists()) throw new ErrnoException(ENOTDIR);
1635 File parent = getParentFile(f);
1636 if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
1637 if(!f.mkdir()) throw new ErrnoException(EIO);
1640 private static File getParentFile(File f) {
1641 String p = f.getParent();
1642 return p == null ? null : new File(p);
1645 public class HostDirFD extends DirFD {
1646 private final File f;
1647 private final File[] children;
1648 public HostDirFD(File f) {
1650 String[] l = f.list();
1651 children = new File[l.length];
1652 for(int i=0;i<l.length;i++) children[i] = new File(f,l[i]);
1654 public int size() { return children.length; }
1655 public String name(int n) { return children[n].getName(); }
1656 public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
1657 public int parentInode() {
1658 File parent = getParentFile(f);
1659 // HACK: myInode() isn't really correct if we're not the root
1660 return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
1662 public int myInode() { return inodes.get(f.getAbsolutePath()); }
1663 public int myDev() { return devno; }
1667 private static void putInt(byte[] buf, int off, int n) {
1668 buf[off+0] = (byte)((n>>>24)&0xff);
1669 buf[off+1] = (byte)((n>>>16)&0xff);
1670 buf[off+2] = (byte)((n>>> 8)&0xff);
1671 buf[off+3] = (byte)((n>>> 0)&0xff);
1674 public static abstract class DirFD extends FD {
1675 private int pos = -2;
1677 protected abstract int size();
1678 protected abstract String name(int n);
1679 protected abstract int inode(int n);
1680 protected abstract int myDev();
1681 protected abstract int parentInode();
1682 protected abstract int myInode();
1683 public int flags() { return O_RDONLY; }
1685 public int getdents(byte[] buf, int off, int len) {
1689 OUTER: for(;len > 0 && pos < size();pos++){
1693 ino = pos == -1 ? parentInode() : myInode();
1694 if(ino == -1) continue;
1695 reclen = 9 + (pos == -1 ? 2 : 1);
1696 if(reclen > len) break OUTER;
1698 if(pos == -1) buf[off+9] = '.';
1701 String f = name(pos);
1702 byte[] fb = getBytes(f);
1703 reclen = fb.length + 9;
1704 if(reclen > len) break OUTER;
1706 System.arraycopy(fb,0,buf,off+8,fb.length);
1709 buf[off+reclen-1] = 0; // null terminate
1710 reclen = (reclen + 3) & ~3; // add padding
1711 putInt(buf,off,reclen);
1712 putInt(buf,off+4,ino);
1719 protected FStat _fstat() {
1720 return new FStat() {
1721 public int type() { return S_IFDIR; }
1722 public int inode() { return myInode(); }
1723 public int dev() { return myDev(); }
1728 public static class DevFS extends FS {
1729 private static final int ROOT_INODE = 1;
1730 private static final int NULL_INODE = 2;
1731 private static final int ZERO_INODE = 3;
1732 private static final int FD_INODE = 4;
1733 private static final int FD_INODES = 32;
1735 private abstract class DevFStat extends FStat {
1736 public int dev() { return devno; }
1737 public int mode() { return 0666; }
1738 public int type() { return S_IFCHR; }
1739 public int nlink() { return 1; }
1740 public abstract int inode();
1743 private abstract class DevDirFD extends DirFD {
1744 public int myDev() { return devno; }
1747 private FD devZeroFD = new FD() {
1748 public int read(byte[] a, int off, int length) {
1749 /*Arrays.fill(a,off,off+length,(byte)0);*/
1750 for(int i=off;i<off+length;i++) a[i] = 0;
1753 public int write(byte[] a, int off, int length) { return length; }
1754 public int seek(int n, int whence) { return 0; }
1755 public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
1756 public int flags() { return O_RDWR; }
1758 private FD devNullFD = new FD() {
1759 public int read(byte[] a, int off, int length) { return 0; }
1760 public int write(byte[] a, int off, int length) { return length; }
1761 public int seek(int n, int whence) { return 0; }
1762 public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
1763 public int flags() { return O_RDWR; }
1766 public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
1767 if(path.equals("null")) return devNullFD;
1768 if(path.equals("zero")) return devZeroFD;
1769 if(path.startsWith("fd/")) {
1772 n = Integer.parseInt(path.substring(4));
1773 } catch(NumberFormatException e) {
1776 if(n < 0 || n >= OPEN_MAX) return null;
1777 if(r.fds[n] == null) return null;
1778 return r.fds[n].dup();
1780 if(path.equals("fd")) {
1782 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
1783 final int[] files = new int[count];
1785 for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
1786 return new DevDirFD() {
1787 public int myInode() { return FD_INODE; }
1788 public int parentInode() { return ROOT_INODE; }
1789 public int inode(int n) { return FD_INODES + n; }
1790 public String name(int n) { return Integer.toString(files[n]); }
1791 public int size() { return files.length; }
1794 if(path.equals("")) {
1795 return new DevDirFD() {
1796 public int myInode() { return ROOT_INODE; }
1797 // HACK: We don't have any clean way to get the parent inode
1798 public int parentInode() { return ROOT_INODE; }
1799 public int inode(int n) {
1801 case 0: return NULL_INODE;
1802 case 1: return ZERO_INODE;
1803 case 2: return FD_INODE;
1808 public String name(int n) {
1810 case 0: return "null";
1811 case 1: return "zero";
1812 case 2: return "fd";
1813 default: return null;
1816 public int size() { return 3; }
1822 public FStat stat(UnixRuntime r,String path) throws ErrnoException {
1823 if(path.equals("null")) return devNullFD.fstat();
1824 if(path.equals("zero")) return devZeroFD.fstat();
1825 if(path.startsWith("fd/")) {
1828 n = Integer.parseInt(path.substring(3));
1829 } catch(NumberFormatException e) {
1832 if(n < 0 || n >= OPEN_MAX) return null;
1833 if(r.fds[n] == null) return null;
1834 return r.fds[n].fstat();
1836 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; }};
1837 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; }};
1841 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1842 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }
1846 public static class ResourceFS extends FS {
1847 final InodeCache inodes = new InodeCache(500);
1849 public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
1850 public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
1851 public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }
1853 FStat connFStat(final URLConnection conn) {
1854 return new FStat() {
1855 public int type() { return S_IFREG; }
1856 public int nlink() { return 1; }
1857 public int mode() { return 0444; }
1858 public int size() { return conn.getContentLength(); }
1859 public int mtime() { return (int)(conn.getDate() / 1000); }
1860 public int inode() { return inodes.get(conn.getURL().toString()); }
1861 public int dev() { return devno; }
1865 public FStat stat(UnixRuntime r, String path) throws ErrnoException {
1866 URL url = r.getClass().getResource("/" + path);
1867 if(url == null) return null;
1869 return connFStat(url.openConnection());
1870 } catch(IOException e) {
1871 throw new ErrnoException(EIO);
1875 public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
1876 if((flags & ~3) != 0) {
1878 System.err.println("WARNING: Unsupported flags passed to ResourceFS.open(\"" + path + "\"): " + toHex(flags & ~3));
1879 throw new ErrnoException(ENOTSUP);
1881 if((flags&3) != RD_ONLY) throw new ErrnoException(EROFS);
1882 URL url = r.getClass().getResource("/" + path);
1883 if(url == null) return null;
1885 final URLConnection conn = url.openConnection();
1886 Seekable.InputStream si = new Seekable.InputStream(conn.getInputStream());
1887 return new SeekableFD(si,flags) { protected FStat _fstat() { return connFStat(conn); } };
1888 } catch(FileNotFoundException e) {
1889 if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) throw new ErrnoException(EACCES);
1891 } catch(IOException e) { throw new ErrnoException(EIO); }