import java.io.*;
import java.util.*;
-// FEATURE: BusyBox's ASH doesn't like \r\n at the end of lines
-// is ash just broken or are many apps like this? if so workaround in nestedvm
+// FEATURE: vfork
-public abstract class UnixRuntime extends Runtime {
+public abstract class UnixRuntime extends Runtime implements Cloneable {
/** The pid of this "process" */
private int pid;
- private int ppid;
- protected int getPid() { return pid; }
+ private UnixRuntime parent;
+ public final int getPid() { return pid; }
- /** processes filesystem */
- private FS fs;
- public FS getFS() { return fs; }
- public void setFS(FS fs) {
- if(state >= RUNNING) throw new IllegalStateException("Can't change fs while process is running");
- this.fs = fs;
+ private static final GlobalState defaultGS = new GlobalState();
+ private GlobalState gs = defaultGS;
+ public void setGlobalState(GlobalState gs) {
+ if(state != STOPPED) throw new IllegalStateException("can't change GlobalState when running");
+ this.gs = gs;
}
/** proceses' current working directory - absolute path WITHOUT leading slash
"" = root, "bin" = /bin "usr/bin" = /usr/bin */
private String cwd;
- /* Static stuff */
- // FEATURE: Most of this is O(n) or worse - fix it
- private final Object waitNotification = new Object();
- private final static int MAX_TASKS = 256;
- private final static UnixRuntime[] tasks = new UnixRuntime[MAX_TASKS];
- private static int addTask(UnixRuntime rt) {
- synchronized(tasks) {
- for(int i=1;i<MAX_TASKS;i++) {
- if(tasks[i] == null) {
- tasks[i] = rt;
- rt.pid = i;
- return i;
- }
- }
- return -1;
- }
- }
- private static void removeTask(UnixRuntime rt) {
- synchronized(tasks) {
- for(int i=1;i<MAX_TASKS;i++)
- if(tasks[i] == rt) { tasks[i] = null; break; }
- }
- }
+ /** The runtime that should be run next when in state == EXECED */
+ private UnixRuntime execedRuntime;
+
+ private Object children; // used only for synchronizatin
+ private Vector activeChildren;
+ private Vector exitedChildren;
- public UnixRuntime(int pageSize, int totalPages, boolean allowEmptyPages) {
- super(pageSize,totalPages,allowEmptyPages);
-
- FS root = new HostFS();
- FS dev = new DevFS();
- MountPointFS mounts = new MountPointFS(root);
- mounts.add("/dev",dev);
- fs = mounts;
-
+ protected UnixRuntime(int pageSize, int totalPages) {
+ super(pageSize,totalPages);
+
// FEATURE: Do the proper mangling for non-unix hosts
String userdir = getSystemProperty("user.dir");
- cwd = userdir != null && userdir.startsWith("/") && File.separatorChar == '/' ? userdir.substring(1) : "";
+ cwd =
+ userdir != null && userdir.startsWith("/") && File.separatorChar == '/' && getSystemProperty("nestedvm.root") == null
+ ? userdir.substring(1) : "";
}
// NOTE: getDisplayName() is a Java2 function
return false;
}
- protected String[] createEnv(String[] extra) {
- String[] defaults = new String[5];
+ String[] createEnv(String[] extra) {
+ String[] defaults = new String[6];
int n=0;
if(extra == null) extra = new String[0];
if(!envHas("USER",extra) && getSystemProperty("user.name") != null)
defaults[n++] = "USER=" + getSystemProperty("user.name");
- if(!envHas("HOME",extra) && getSystemProperty("user.name") != null)
+ if(!envHas("HOME",extra) && getSystemProperty("user.home") != null)
defaults[n++] = "HOME=" + getSystemProperty("user.home");
if(!envHas("SHELL",extra)) defaults[n++] = "SHELL=/bin/sh";
if(!envHas("TERM",extra)) defaults[n++] = "TERM=vt100";
if(!envHas("TZ",extra)) defaults[n++] = "TZ=" + posixTZ();
+ if(!envHas("PATH",extra)) defaults[n++] = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin";
String[] env = new String[extra.length+n];
for(int i=0;i<n;i++) env[i] = defaults[i];
for(int i=0;i<extra.length;i++) env[n++] = extra[i];
return env;
}
- protected void _start() {
- if(addTask(this) < 0) throw new Error("Task list full");
- }
+ private static class ProcessTableFullExn extends RuntimeException { }
- protected void _exit() {
- synchronized(tasks) {
- if(ppid == 0) removeTask(this);
- for(int i=0;i<MAX_TASKS;i++) {
- if(tasks[i] != null && tasks[i].ppid == pid) {
- if(tasks[i].state == DONE) removeTask(tasks[i]);
- else tasks[i].ppid = 0;
+ void _started() {
+ UnixRuntime[] tasks = gs.tasks;
+ synchronized(gs) {
+ if(pid != 0) {
+ UnixRuntime prev = tasks[pid];
+ if(prev == null || prev == this || prev.pid != pid || prev.parent != parent)
+ throw new Error("should never happen");
+ synchronized(parent.children) {
+ int i = parent.activeChildren.indexOf(prev);
+ if(i == -1) throw new Error("should never happen");
+ parent.activeChildren.set(i,this);
}
+ } else {
+ int newpid = -1;
+ int nextPID = gs.nextPID;
+ for(int i=nextPID;i<tasks.length;i++) if(tasks[i] == null) { newpid = i; break; }
+ if(newpid == -1) for(int i=1;i<nextPID;i++) if(tasks[i] == null) { newpid = i; break; }
+ if(newpid == -1) throw new ProcessTableFullExn();
+ pid = newpid;
+ gs.nextPID = newpid + 1;
}
- state = DONE;
- if(ppid != 0) synchronized(tasks[ppid].waitNotification) { tasks[ppid].waitNotification.notify(); }
+ tasks[pid] = this;
}
}
-
- protected int syscall(int syscall, int a, int b, int c, int d) {
+
+ int _syscall(int syscall, int a, int b, int c, int d) throws ErrnoException, FaultException {
switch(syscall) {
case SYS_kill: return sys_kill(a,b);
case SYS_fork: return sys_fork();
case SYS_pipe: return sys_pipe(a);
case SYS_dup2: return sys_dup2(a,b);
+ case SYS_dup: return sys_dup(a);
case SYS_waitpid: return sys_waitpid(a,b,c);
case SYS_stat: return sys_stat(a,b);
+ case SYS_lstat: return sys_lstat(a,b);
case SYS_mkdir: return sys_mkdir(a,b);
case SYS_getcwd: return sys_getcwd(a,b);
case SYS_chdir: return sys_chdir(a);
- case SYS_execve: return sys_execve(a,b,c);
+ case SYS_exec: return sys_exec(a,b,c);
+ case SYS_getdents: return sys_getdents(a,b,c,d);
+ case SYS_unlink: return sys_unlink(a);
+ case SYS_getppid: return sys_getppid();
- default: return super.syscall(syscall,a,b,c,d);
+ default: return super._syscall(syscall,a,b,c,d);
}
}
- protected FD open(String path, int flags, int mode) throws IOException {
- return fs.open(normalizePath(path),flags,mode);
+ FD _open(String path, int flags, int mode) throws ErrnoException {
+ return gs.open(this,normalizePath(path),flags,mode);
+ }
+
+ private int sys_getppid() {
+ return parent == null ? 1 : parent.pid;
}
- // FEATURE: Allow simple, broken signal delivery to other processes
- // (check if a signal was delivered before and after syscalls)
- // FEATURE: Implement raise() in terms of call("raise",...) - kinda cheap, but it keeps the complexity in newlib
/** The kill syscall.
SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
case 23: // SIGIO
case 28: // SIGWINCH
break;
- default: {
- String msg = "Terminating on signal: " + signal + "\n";
- exitStatus = 1;
- state = DONE;
- if(fds[2]==null) {
- System.out.print(msg);
- } else {
- try {
- byte[] b = getBytes(msg);
- fds[2].write(b,0,b.length);
- }
- catch(IOException e) { /* ignore */ }
- }
- }
+ default:
+ return syscall(SYS_exit,128+signal,0,0,0);
}
return 0;
}
- private int sys_waitpid(int pid, int statusAddr, int options) {
+ private int sys_waitpid(int pid, int statusAddr, int options) throws FaultException, ErrnoException {
final int WNOHANG = 1;
if((options & ~(WNOHANG)) != 0) return -EINVAL;
- if(pid !=-1 && (pid <= 0 || pid >= MAX_TASKS)) return -ECHILD;
- for(;;) {
- synchronized(tasks) {
- UnixRuntime task = null;
+ if(pid == 0 || pid < -1) {
+ if(STDERR_DIAG) System.err.println("WARNING: waitpid called with a pid of " + pid);
+ return -ECHILD;
+ }
+ boolean blocking = (options&WNOHANG)==0;
+
+ if(pid !=-1 && (pid <= 0 || pid >= gs.tasks.length)) return -ECHILD;
+ if(children == null) return blocking ? -ECHILD : 0;
+
+ UnixRuntime done = null;
+
+ synchronized(children) {
+ for(;;) {
if(pid == -1) {
- for(int i=0;i<MAX_TASKS;i++) {
- if(tasks[i] != null && tasks[i].ppid == this.pid && tasks[i].state == DONE) {
- task = tasks[i];
- break;
- }
+ if(exitedChildren.size() > 0) done = (UnixRuntime)exitedChildren.remove(exitedChildren.size() - 1);
+ } else if(pid > 0) {
+ UnixRuntime t = gs.tasks[pid];
+ if(t.parent != this) return -ECHILD;
+ if(t.state == EXITED) {
+ if(!exitedChildren.remove(t)) throw new Error("should never happen");
+ done = t;
}
- } else if(tasks[pid] != null && tasks[pid].ppid == this.pid && tasks[pid].state == DONE) {
- task = tasks[pid];
+ } else {
+ // process group stuff, EINVAL returned above
+ throw new Error("should never happen");
}
-
- if(task != null) {
- removeTask(task);
- try {
- if(statusAddr!=0) memWrite(statusAddr,task.exitStatus()<<8);
- } catch(FaultException e) {
- return -EFAULT;
- }
-
- return task.pid;
+ if(done == null) {
+ if(!blocking) return 0;
+ try { children.wait(); } catch(InterruptedException e) {}
+ //System.err.println("waitpid woke up: " + exitedChildren.size());
+ } else {
+ gs.tasks[done.pid] = null;
+ break;
}
}
- if((options&WNOHANG)!=0) return 0;
- synchronized(waitNotification) {
- try { waitNotification.wait(); } catch(InterruptedException e) { /* ignore */ }
+ }
+ if(statusAddr!=0) memWrite(statusAddr,done.exitStatus()<<8);
+ return done.pid;
+ }
+
+
+ void _exited() {
+ if(children != null) synchronized(children) {
+ for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
+ UnixRuntime child = (UnixRuntime) e.nextElement();
+ gs.tasks[child.pid] = null;
+ }
+ exitedChildren.clear();
+ for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
+ UnixRuntime child = (UnixRuntime) e.nextElement();
+ child.parent = null;
+ }
+ activeChildren.clear();
+ }
+
+ UnixRuntime _parent = parent;
+ if(_parent == null) {
+ gs.tasks[pid] = null;
+ } else {
+ synchronized(_parent.children) {
+ if(parent == null) {
+ gs.tasks[pid] = null;
+ } else {
+ if(!parent.activeChildren.remove(this)) throw new Error("should never happen _exited: pid: " + pid);
+ parent.exitedChildren.add(this);
+ parent.children.notify();
+ }
}
}
}
- // FEATURE: Make this cleaner
- // Great ugliness lies within.....
+ protected Object clone() throws CloneNotSupportedException {
+ UnixRuntime r = (UnixRuntime) super.clone();
+ r.pid = 0;
+ r.parent = null;
+ r.children = null;
+ r.activeChildren = r.exitedChildren = null;
+ return r;
+ }
+
private int sys_fork() {
- CPUState state = getCPUState();
+ CPUState state = new CPUState();
+ getCPUState(state);
int sp = state.r[SP];
final UnixRuntime r;
+
try {
- r = (UnixRuntime) getClass().newInstance();
+ r = (UnixRuntime) clone();
} catch(Exception e) {
- System.err.println(e);
+ e.printStackTrace();
return -ENOMEM;
}
- int child_pid = addTask(r);
- if(child_pid < 0) return -ENOMEM;
-
- r.ppid = pid;
- r.brkAddr = brkAddr;
- r.fds = new FD[OPEN_MAX];
- for(int i=0;i<OPEN_MAX;i++) if(fds[i] != null) r.fds[i] = fds[i].dup();
- r.cwd = cwd;
- r.fs = fs;
- for(int i=0;i<TOTAL_PAGES;i++) {
- if(readPages[i] == null) continue;
- if(isEmptyPage(writePages[i])) {
- r.readPages[i] = r.writePages[i] = writePages[i];
- } else if(writePages[i] != null) {
- r.readPages[i] = r.writePages[i] = new int[PAGE_WORDS];
- if(STACK_BOTTOM == 0 || i*PAGE_SIZE < STACK_BOTTOM || i*PAGE_SIZE >= sp-PAGE_SIZE*2)
- System.arraycopy(writePages[i],0,r.writePages[i],0,PAGE_WORDS);
- } else {
- r.readPages[i] = r.readPages[i];
- }
+
+ r.parent = this;
+
+ try {
+ r._started();
+ } catch(ProcessTableFullExn e) {
+ return -ENOMEM;
+ }
+
+ //System.err.println("fork " + pid + " -> " + r.pid + " tasks[" + r.pid + "] = " + gd.tasks[r.pid]);
+ if(children == null) {
+ children = new Object();
+ activeChildren = new Vector();
+ exitedChildren = new Vector();
}
- state.r[V0] = 0;
- state.pc += 4;
+ activeChildren.add(r);
+
+ state.r[V0] = 0; // return 0 to child
+ state.pc += 4; // skip over syscall instruction
r.setCPUState(state);
r.state = PAUSED;
- new Thread() {
- public void run() {
- try {
- while(!r.execute());
- } catch(Exception e) {
- System.err.println("Forked process threw exception: ");
- e.printStackTrace();
- }
+ new ForkedProcess(r);
+
+ return r.pid;
+ }
+
+ public static final class ForkedProcess extends Thread {
+ private final UnixRuntime initial;
+ public ForkedProcess(UnixRuntime initial) { this.initial = initial; start(); }
+ public void run() { UnixRuntime.executeAndExec(initial); }
+ }
+
+ public static int runAndExec(UnixRuntime r, String argv0, String[] rest) { return runAndExec(r,concatArgv(argv0,rest)); }
+ public static int runAndExec(UnixRuntime r, String[] argv) { r.start(argv); return executeAndExec(r); }
+
+ public static int executeAndExec(UnixRuntime r) {
+ for(;;) {
+ for(;;) {
+ if(r.execute()) break;
+ if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing runAndExec()");
+ }
+ if(r.state != EXECED) return r.exitStatus();
+ r = r.execedRuntime;
+ }
+ }
+
+ private String[] readStringArray(int addr) throws ReadFaultException {
+ int count = 0;
+ for(int p=addr;memRead(p) != 0;p+=4) count++;
+ String[] a = new String[count];
+ for(int i=0,p=addr;i<count;i++,p+=4) a[i] = cstring(memRead(p));
+ return a;
+ }
+
+ private int sys_exec(int cpath, int cargv, int cenvp) throws ErrnoException, FaultException {
+ return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
+ }
+
+ private int exec(String normalizedPath, String[] argv, String[] envp) throws ErrnoException {
+ if(argv.length == 0) argv = new String[]{""};
+
+ // NOTE: For this little hack to work nestedvm.root MUST be "."
+ /*try {
+ System.err.println("Execing normalized path: " + normalizedPath);
+ if(true) return exec(new Interpreter(normalizedPath),argv,envp);
+ } catch(IOException e) { throw new Error(e); }*/
+
+ Object o = gs.exec(this,normalizedPath);
+ if(o == null) return -ENOENT;
+
+ if(o instanceof Class) {
+ Class c = (Class) o;
+ try {
+ return exec((UnixRuntime) c.newInstance(),argv,envp);
+ } catch(Exception e) {
+ e.printStackTrace();
+ return -ENOEXEC;
}
- }.start();
+ } else {
+ String[] command = (String[]) o;
+ String[] newArgv = new String[argv.length + command[1] != null ? 2 : 1];
+ int p = command[0].lastIndexOf('/');
+ newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
+ p = 1;
+ if(command[1] != null) newArgv[p++] = command[1];
+ newArgv[p++] = "/" + normalizedPath;
+ for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
+ return exec(command[0],newArgv,envp);
+ }
+ }
+
+ private int exec(UnixRuntime r, String[] argv, String[] envp) {
+
+ //System.err.println("Execing " + r);
+ for(int i=0;i<OPEN_MAX;i++) if(closeOnExec[i]) closeFD(i);
+ r.fds = fds;
+ r.closeOnExec = closeOnExec;
+ // make sure this doesn't get messed with these since we didn't copy them
+ fds = null;
+ closeOnExec = null;
+
+ r.gs = gs;
+ r.sm = sm;
+ r.cwd = cwd;
+ r.pid = pid;
+ r.parent = parent;
+ r.start(argv,envp);
+
+ state = EXECED;
+ execedRuntime = r;
- return child_pid;
+ return 0;
}
+
+ // FEATURE: Make sure fstat info is correct
+ // FEATURE: This could be faster if we did direct copies from each process' memory
+ // FEATURE: Check this logic one more time
+ public static class Pipe {
+ private final byte[] pipebuf = new byte[PIPE_BUF*4];
+ private int readPos;
+ private int writePos;
- private int sys_execve(int cstring, int argv, int envp) {
- /*
- try {
- String path = cstring(cstring);
- FStat stat = fs.stat(path);
-
-
+ public final FD reader = new Reader();
+ public final FD writer = new Writer();
+
+ public class Reader extends FD {
+ protected FStat _fstat() { return new FStat(); }
+ public int read(byte[] buf, int off, int len) throws ErrnoException {
+ if(len == 0) return 0;
+ synchronized(Pipe.this) {
+ while(writePos != -1 && readPos == writePos) {
+ try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
+ }
+ if(writePos == -1) return 0; // eof
+ len = Math.min(len,writePos-readPos);
+ System.arraycopy(pipebuf,readPos,buf,off,len);
+ readPos += len;
+ if(readPos == writePos) Pipe.this.notify();
+ return len;
+ }
+ }
+ public void _close() { synchronized(Pipe.this) { readPos = -1; Pipe.this.notify(); } }
+ }
+
+ public class Writer extends FD {
+ protected FStat _fstat() { return new FStat(); }
+ public int write(byte[] buf, int off, int len) throws ErrnoException {
+ if(len == 0) return 0;
+ synchronized(Pipe.this) {
+ if(readPos == -1) throw new ErrnoException(EPIPE);
+ if(pipebuf.length - writePos < Math.min(len,PIPE_BUF)) {
+ // not enough space to atomicly write the data
+ while(readPos != -1 && readPos != writePos) {
+ try { Pipe.this.wait(); } catch(InterruptedException e) { /* ignore */ }
+ }
+ if(readPos == -1) throw new ErrnoException(EPIPE);
+ readPos = writePos = 0;
+ }
+ len = Math.min(len,pipebuf.length - writePos);
+ System.arraycopy(buf,off,pipebuf,writePos,len);
+ if(readPos == writePos) Pipe.this.notify();
+ writePos += len;
+ return len;
+ }
+ }
+ public void _close() { synchronized(Pipe.this) { writePos = -1; Pipe.this.notify(); } }
}
- catch(FaultException e) { return -EFAULT; }
- catch(FileNotFoundException e) { return -ENOENT; }
- catch(IOException e) { return -EIO; }*/
- throw new Error("FIXME - exec() isn't finished");
}
-
+
private int sys_pipe(int addr) {
- PipedOutputStream writerStream = new PipedOutputStream();
- PipedInputStream readerStream;
- try {
- readerStream = new PipedInputStream(writerStream);
- } catch(IOException e) {
- return -EIO;
- }
- FD reader = new InputStreamFD(readerStream);
- FD writer = new OutputStreamFD(writerStream);
- int fd1 = addFD(reader);
+ Pipe pipe = new Pipe();
+
+ int fd1 = addFD(pipe.reader);
if(fd1 < 0) return -ENFILE;
- int fd2 = addFD(writer);
+ int fd2 = addFD(pipe.writer);
if(fd2 < 0) { closeFD(fd1); return -ENFILE; }
+
try {
memWrite(addr,fd1);
memWrite(addr+4,fd2);
return 0;
}
- private int sys_stat(int cstring, int addr) {
- try {
- String path = normalizePath(cstring(cstring));
- return stat(fs.stat(path),addr);
- }
- catch(ErrnoException e) { return -e.errno; }
- catch(FileNotFoundException e) {
- if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) return -EACCES;
- return -ENOENT;
- }
- catch(IOException e) { return -EIO; }
- catch(FaultException e) { return -EFAULT; }
+ private int sys_dup(int oldd) {
+ if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
+ if(fds[oldd] == null) return -EBADFD;
+ FD fd = fds[oldd].dup();
+ int newd = addFD(fd);
+ if(newd < 0) { fd.close(); return -ENFILE; }
+ return newd;
}
+ private int sys_stat(int cstring, int addr) throws FaultException, ErrnoException {
+ FStat s = gs.stat(this,normalizePath(cstring(cstring)));
+ if(s == null) return -ENOENT;
+ return stat(s,addr);
+ }
- private int sys_mkdir(int cstring, int mode) {
- try {
- fs.mkdir(normalizePath(cstring(cstring)));
- return 0;
- }
- catch(ErrnoException e) { return -e.errno; }
- catch(FileNotFoundException e) { return -ENOENT; }
- catch(IOException e) { return -EIO; }
- catch(FaultException e) { return -EFAULT; }
+ private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
+ FStat s = gs.lstat(this,normalizePath(cstring(cstring)));
+ if(s == null) return -ENOENT;
+ return stat(s,addr);
+ }
+
+ private int sys_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
+ gs.mkdir(this,normalizePath(cstring(cstring)),mode);
+ return 0;
}
+ private int sys_unlink(int cstring) throws FaultException, ErrnoException {
+ gs.unlink(this,normalizePath(cstring(cstring)));
+ return 0;
+ }
- private int sys_getcwd(int addr, int size) {
+ private int sys_getcwd(int addr, int size) throws FaultException, ErrnoException {
byte[] b = getBytes(cwd);
if(size == 0) return -EINVAL;
if(size < b.length+2) return -ERANGE;
- try {
- memset(addr,'/',1);
- copyout(b,addr+1,b.length);
- memset(addr+b.length+1,0,1);
- return addr;
- } catch(FaultException e) {
- return -EFAULT;
- }
+ memset(addr,'/',1);
+ copyout(b,addr+1,b.length);
+ memset(addr+b.length+1,0,1);
+ return addr;
}
- private int sys_chdir(int addr) {
- try {
- String path = normalizePath(cstring(addr));
- System.err.println("Chdir: " + cstring(addr) + " -> " + path + " pwd: " + cwd);
- if(fs.stat(path).type() != FStat.S_IFDIR) return -ENOTDIR;
- cwd = path;
- System.err.println("Now: [" + cwd + "]");
- return 0;
- }
- catch(ErrnoException e) { return -e.errno; }
- catch(FileNotFoundException e) { return -ENOENT; }
- catch(IOException e) { return -EIO; }
- catch(FaultException e) { return -EFAULT; }
+ private int sys_chdir(int addr) throws ErrnoException, FaultException {
+ String path = normalizePath(cstring(addr));
+ //System.err.println("Chdir: " + cstring(addr) + " -> " + path + " pwd: " + cwd);
+ if(gs.stat(this,path).type() != FStat.S_IFDIR) return -ENOTDIR;
+ cwd = path;
+ //System.err.println("Now: [" + cwd + "]");
+ return 0;
}
-
- public void chdir(String dir) throws FileNotFoundException {
- if(state >= RUNNING) throw new IllegalStateException("Can't chdir while process is running");
- try {
- dir = normalizePath(dir);
- if(fs.stat(dir).type() != FStat.S_IFDIR) throw new FileNotFoundException();
- } catch(IOException e) {
- throw new FileNotFoundException();
- }
- cwd = dir;
+
+ private int sys_getdents(int fdn, int addr, int count, int seekptr) throws FaultException, ErrnoException {
+ count = Math.min(count,MAX_CHUNK);
+ if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
+ if(fds[fdn] == null) return -EBADFD;
+ byte[] buf = byteBuf(count);
+ int n = fds[fdn].getdents(buf,0,count);
+ copyout(buf,addr,n);
+ return n;
}
-
- public abstract static class FS {
- protected FD _open(String path, int flags, int mode) throws IOException { return null; }
- protected FStat _stat(String path) throws IOException { return null; }
- protected void _mkdir(String path) throws IOException { throw new ErrnoException(EROFS); }
-
+
+ // FEATURE: Run through the fork/wait stuff one more time
+ public static class GlobalState {
protected static final int OPEN = 1;
protected static final int STAT = 2;
- protected static final int MKDIR = 3;
-
- protected Object op(int op, String path, int arg1, int arg2) throws IOException {
- switch(op) {
- case OPEN: return _open(path,arg1,arg2);
- case STAT: return _stat(path);
- case MKDIR: _mkdir(path); return null;
- default: throw new IllegalArgumentException("Unknown FS OP");
- }
- }
-
- public final FD open(String path, int flags, int mode) throws IOException { return (FD) op(OPEN,path,flags,mode); }
- public final FStat stat(String path) throws IOException { return (FStat) op(STAT,path,0,0); }
- public final void mkdir(String path) throws IOException { op(MKDIR,path,0,0); }
-
- // FIXME: inode stuff
- protected static FD directoryFD(String[] files, int hashCode) throws IOException {
- ByteArrayOutputStream bos = new ByteArrayOutputStream();
- DataOutputStream dos = new DataOutputStream(bos);
- for(int i=0;i<files.length;i++) {
- byte[] b = getBytes(files[i]);
- int inode = (files[i].hashCode() ^ hashCode) & 0xfffff;
- dos.writeInt(inode);
- dos.writeInt(b.length);
- dos.write(b,0,b.length);
+ protected static final int LSTAT = 3;
+ protected static final int MKDIR = 4;
+ protected static final int UNLINK = 5;
+
+ final UnixRuntime[] tasks;
+ int nextPID = 1;
+
+ private MP[] mps = new MP[0];
+ private FS root;
+
+ public GlobalState() { this(255); }
+ public GlobalState(int maxProcs) { this(maxProcs,true); }
+ public GlobalState(int maxProcs, boolean defaultMounts) {
+ tasks = new UnixRuntime[maxProcs+1];
+ if(defaultMounts) {
+ addMount("/",new HostFS());
+ addMount("/dev",new DevFS());
}
- final byte[] data = bos.toByteArray();
- return new SeekableFD(new Seekable.ByteArray(data,false),RD_ONLY) {
- protected FStat _fstat() { return new FStat() {
- public int length() { return data.length; }
- public int type() { return S_IFDIR; }
- }; }
- };
+ }
+
+ private static class MP {
+ public MP(String path, FS fs) { this.path = path; this.fs = fs; }
+ public String path;
+ public FS fs;
+ public int compareTo(Object o) {
+ if(!(o instanceof MP)) return 1;
+ return -path.compareTo(((MP)o).path);
+ }
+ }
+
+ public synchronized FS getMount(String path) {
+ if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
+ if(path.equals("/")) return root;
+ path = path.substring(1);
+ for(int i=0;i<mps.length;i++)
+ if(mps[i].path.equals(path)) return mps[i].fs;
+ return null;
+ }
+
+ public synchronized void addMount(String path, FS fs) {
+ if(getMount(path) != null) throw new IllegalArgumentException("mount point already exists");
+ if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
+
+ if(fs.owner != null) fs.owner.removeMount(fs);
+ fs.owner = this;
+
+ if(path.equals("/")) { root = fs; fs.devno = 1; return; }
+ path = path.substring(1);
+ int oldLength = mps.length;
+ MP[] newMPS = new MP[oldLength + 1];
+ if(oldLength != 0) System.arraycopy(mps,0,newMPS,0,oldLength);
+ newMPS[oldLength] = new MP(path,fs);
+ Arrays.sort(newMPS);
+ mps = newMPS;
+ int highdevno = 0;
+ for(int i=0;i<mps.length;i++) highdevno = max(highdevno,mps[i].fs.devno);
+ fs.devno = highdevno + 2;
+ }
+
+ public synchronized void removeMount(FS fs) {
+ for(int i=0;i<mps.length;i++) if(mps[i].fs == fs) { removeMount(i); return; }
+ throw new IllegalArgumentException("mount point doesn't exist");
+ }
+
+ public synchronized void removeMount(String path) {
+ if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
+ if(path.equals("/")) {
+ removeMount(-1);
+ } else {
+ path = path.substring(1);
+ int p;
+ for(p=0;p<mps.length;p++) if(mps[p].path.equals(path)) break;
+ if(p == mps.length) throw new IllegalArgumentException("mount point doesn't exist");
+ removeMount(p);
+ }
+ }
+
+ private void removeMount(int index) {
+ if(index == -1) { root.owner = null; root = null; return; }
+ MP[] newMPS = new MP[mps.length - 1];
+ System.arraycopy(mps,0,newMPS,0,index);
+ System.arraycopy(mps,0,newMPS,index,mps.length-index-1);
+ mps = newMPS;
+ }
+
+ private Object fsop(int op, UnixRuntime r, String normalizedPath, int arg1, int arg2) throws ErrnoException {
+ int pl = normalizedPath.length();
+ if(pl != 0) {
+ MP[] list;
+ synchronized(this) { list = mps; }
+ for(int i=0;i<list.length;i++) {
+ MP mp = list[i];
+ int mpl = mp.path.length();
+ if(normalizedPath.startsWith(mp.path) && (pl == mpl || (pl < mpl && normalizedPath.charAt(mpl) == '/')))
+ return dispatch(mp.fs,op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
+ }
+ }
+ return dispatch(root,op,r,normalizedPath,arg1,arg2);
+ }
+
+ private static Object dispatch(FS fs, int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
+ switch(op) {
+ case OPEN: return fs.open(r,path,arg1,arg2);
+ case STAT: return fs.stat(r,path);
+ case LSTAT: return fs.lstat(r,path);
+ case MKDIR: fs.mkdir(r,path,arg1); return null;
+ case UNLINK: fs.unlink(r,path); return null;
+ default: throw new Error("should never happen");
+ }
+ }
+
+ public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException { return (FD) fsop(OPEN,r,path,flags,mode); }
+ public final FStat stat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(STAT,r,path,0,0); }
+ public final FStat lstat(UnixRuntime r, String path) throws ErrnoException { return (FStat) fsop(LSTAT,r,path,0,0); }
+ public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { fsop(MKDIR,r,path,mode,0); }
+ public final void unlink(UnixRuntime r, String path) throws ErrnoException { fsop(UNLINK,r,path,0,0); }
+
+ private Hashtable execCache = new Hashtable();
+ private static class CacheEnt {
+ public final long time;
+ public final long size;
+ public final Object o;
+ public CacheEnt(long time, long size, Object o) { this.time = time; this.size = size; this.o = o; }
+ }
+
+ public synchronized Object exec(UnixRuntime r, String path) throws ErrnoException {
+ // FIXME: Hideous hack to make a standalone busybox possible
+ if(path.equals("bin/busybox") && r.getClass().getName().endsWith("BusyBox"))
+ return r.getClass();
+ FStat fstat = stat(r,path);
+ if(fstat == null) return null;
+ long mtime = fstat.mtime();
+ long size = fstat.size();
+ CacheEnt ent = (CacheEnt) execCache.get(path);
+ if(ent != null) {
+ //System.err.println("Found cached entry for " + path);
+ if(ent.time == mtime && ent.size == size) return ent.o;
+ //System.err.println("Cache was out of date");
+ execCache.remove(path);
+ }
+ FD fd = open(r,path,RD_ONLY,0);
+ if(fd == null) return null;
+ Seekable s = fd.seekable();
+
+ String[] command = null;
+
+ if(s == null) throw new ErrnoException(EACCES);
+ byte[] buf = new byte[4096];
+
+ try {
+ int n = s.read(buf,0,buf.length);
+ if(n == -1) throw new ErrnoException(ENOEXEC);
+
+ switch(buf[0]) {
+ case '\177': // possible ELF
+ if(n < 4 && s.tryReadFully(buf,n,4-n) != 4-n) throw new ErrnoException(ENOEXEC);
+ if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') throw new ErrnoException(ENOEXEC);
+ break;
+ case '#':
+ if(n == 1) {
+ int n2 = s.read(buf,1,buf.length-1);
+ if(n2 == -1) throw new ErrnoException(ENOEXEC);
+ n += n2;
+ }
+ if(buf[1] != '!') throw new ErrnoException(ENOEXEC);
+ int p = 2;
+ n -= 2;
+ OUTER: for(;;) {
+ for(int i=p;i<p+n;i++) if(buf[i] == '\n') { p = i; break OUTER; }
+ p += n;
+ if(p == buf.length) break OUTER;
+ n = s.read(buf,p,buf.length-p);
+ }
+ command = new String[2];
+ int arg;
+ for(arg=2;arg<p;arg++) if(buf[arg] == ' ') break;
+ if(arg < p) {
+ int cmdEnd = arg;
+ while(arg < p && buf[arg] == ' ') arg++;
+ command[0] = new String(buf,2,cmdEnd);
+ command[1] = arg < p ? new String(buf,arg,p-arg) : null;
+ } else {
+ command[0] = new String(buf,2,p-2);
+ }
+ //System.err.println("command[0]: " + command[0] + " command[1]: " + command[1]);
+ break;
+ default:
+ throw new ErrnoException(ENOEXEC);
+ }
+ } catch(IOException e) {
+ fd.close();
+ throw new ErrnoException(EIO);
+ }
+
+ if(command == null) {
+ // its an elf binary
+ try {
+ s.seek(0);
+ Class c = RuntimeCompiler.compile(s);
+ //System.err.println("Compile succeeded: " + c);
+ ent = new CacheEnt(mtime,size,c);
+ } catch(Compiler.Exn e) {
+ if(STDERR_DIAG) e.printStackTrace();
+ throw new ErrnoException(ENOEXEC);
+ } catch(IOException e) {
+ if(STDERR_DIAG) e.printStackTrace();
+ throw new ErrnoException(EIO);
+ }
+ } else {
+ ent = new CacheEnt(mtime,size,command);
+ }
+
+ fd.close();
+
+ execCache.put(path,ent);
+ return ent.o;
}
}
+
+ public abstract static class FS {
+ GlobalState owner;
+ int devno;
+ public FStat lstat(UnixRuntime r, String path) throws ErrnoException { return stat(r,path); }
+
+ // If this returns null it'll be truned into an ENOENT
+ public abstract FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException;
+ // If this returns null it'll be turned into an ENOENT
+ public abstract FStat stat(UnixRuntime r, String path) throws ErrnoException;
+ public abstract void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException;
+ public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
+ }
+
+ // FEATURE: chroot support in here
private String normalizePath(String path) {
boolean absolute = path.startsWith("/");
int cwdl = cwd.length();
if(absolute) {
do { inp++; } while(in[inp] == '/');
} else if(cwdl != 0) {
- cwd.getChars(0,cwdl,out,0);
- outp = cwdl;
+ cwd.getChars(0,cwdl,out,0);
+ outp = cwdl;
}
path.getChars(0,path.length(),in,0);
while(in[inp] != 0) {
- if(inp != 0) {
- if(in[inp] != '/') { out[outp++] = in[inp++]; continue; }
- while(in[inp] == '/') inp++;
+ if(inp != 0 || cwdl==0) {
+ if(in[inp] != '/') { out[outp++] = in[inp++]; continue; }
+ while(in[inp] == '/') inp++;
}
if(in[inp] == '\0') continue;
if(in[inp] != '.') { out[outp++] = '/'; out[outp++] = in[inp++]; continue; }
inp += 2;
if(outp > 0) outp--;
while(outp > 0 && out[outp] != '/') outp--;
- System.err.println("After ..: " + new String(out,0,outp));
+ //System.err.println("After ..: " + new String(out,0,outp));
continue;
}
inp++;
+ out[outp++] = '/';
out[outp++] = '.';
}
if(outp > 0 && out[outp-1] == '/') outp--;
return new String(out,0,outp);
}
- // FIXME: This is probably still buggy
- // FEATURE: Remove some of the "should never happen checks"
- /*protected static String cleanupPath(String p) throws ErrnoException {
- if(p.length() == 0) throw new ErrnoException(ENOENT);
- if(needsCleanup(p)) {
- char[] in = p.toCharArray();
- char[] out;
- int outp ;
- if(in[0] == '/') {
- out = new char[in.length];
- outp = 0;
- } else {
- out = new char[cwd.length() + in.length + 1];
- outp = cwd.length();
- for(int i=0;i<outp;i++) out[i] = cwd.charAt(i);
- if(outp == 0 || out[0] != '/') throw new Error("should never happen");
- }
- int inLength = in.length;
- int inp = 0;
- while(inp<inLength) {
- if(inp == 0 || in[inp] == '/') {
- while(inp < inLength && in[inp] == '/') inp++;
- if(inp == inLength) break;
- if(in[inp] == '.') {
- if(inp+1 == inLength) break;
- if(in[inp+1] == '.' && (inp+2 == inLength || in[inp+2] == '/')) {
- inp+=2;
- if(outp == 0) continue;
- do { outp--; } while(outp > 0 && out[outp] != '/');
- } else if(in[inp+1] == '/') {
- inp++;
- } else {
- out[outp++] = '/';
- }
- } else {
- out[outp++] = '/';
- out[outp++] = in[inp++];
- }
- } else {
- out[outp++] = in[inp++];
- }
- }
- if(outp == 0) out[outp++] = '/';
- return new String(out,0,outp);
- } else {
- if(p.startsWith("/")) return p;
- StringBuffer sb = new StringBuffer(cwd);
- if(!cwd.equals("/")) sb.append('/');
- return sb.append(p).toString();
- }
- }*/
-
- public static class MountPointFS extends FS {
- private static class MP {
- public MP(String path, FS fs) { this.path = path; this.fs = fs; }
- public String path;
- public FS fs;
- public int compareTo(Object o) {
- if(!(o instanceof MP)) return 1;
- return -path.compareTo(((MP)o).path);
- }
- }
- private final MP[][] mps = new MP[128][];
- private final FS root;
- public MountPointFS(FS root) { this.root = root; }
-
- private static String fixup(String path) {
- if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
- path = path.substring(1);
- if(path.length() == 0) throw new IllegalArgumentException("Zero length mount point path");
- return path;
- }
- public FS get(String path) {
- path = fixup(path);
- int f = path.charAt(0) & 0x7f;
- for(int i=0;mps[f] != null && i < mps[f].length;i++)
- if(mps[f][i].path.equals(path)) return mps[f][i].fs;
- return null;
- }
-
- public void add(String path, FS fs) {
- if(get(path) != null) throw new IllegalArgumentException("mount point already exists");
- path = fixup(path);
- int f = path.charAt(0) & 0x7f;
- int oldLength = mps[f] == null ? 0 : mps[f].length;
- MP[] newList = new MP[oldLength + 1];
- if(oldLength != 0) System.arraycopy(mps[f],0,newList,0,oldLength);
- newList[oldLength] = new MP(path,fs);
- Arrays.sort(newList);
- mps[f] = newList;
- }
-
- public void remove(String path) {
- path = fixup(path);
- if(get(path) == null) throw new IllegalArgumentException("mount point doesn't exist");
- int f = path.charAt(0) & 0x7f;
- MP[] oldList = mps[f];
- MP[] newList = new MP[oldList.length - 1];
- int p = 0;
- for(p=0;p<oldList.length;p++) if(oldList[p].path.equals(path)) break;
- if(p == oldList.length) throw new Error("should never happen");
- System.arraycopy(oldList,0,newList,0,p);
- System.arraycopy(oldList,0,newList,p,oldList.length-p-1);
- mps[f] = newList;
- }
-
- protected Object op(int op, String path, int arg1, int arg2) throws IOException {
- int pl = path.length();
- if(pl != 0) {
- MP[] list = mps[path.charAt(0) & 0x7f];
- if(list != null) for(int i=0;i<list.length;i++) {
- MP mp = list[i];
- int mpl = mp.path.length();
- if(pl == mpl || (pl < mpl && path.charAt(mpl) == '/'))
- return mp.fs.op(op,pl == mpl ? "" : path.substring(mpl+1),arg1,arg2);
- }
+ FStat hostFStat(final File f, Object data) {
+ boolean e = false;
+ try {
+ FileInputStream fis = new FileInputStream(f);
+ switch(fis.read()) {
+ case '\177': e = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
+ case '#': e = fis.read() == '!';
}
- return root.op(op,path,arg1,arg2);
- }
+ fis.close();
+ } catch(IOException e2) { }
+ HostFS fs = (HostFS) data;
+ final int inode = fs.inodes.get(f.getAbsolutePath());
+ final int devno = fs.devno;
+ return new HostFStat(f,e) {
+ public int inode() { return inode; }
+ public int dev() { return devno; }
+ };
+ }
+
+ FD hostFSDirFD(File f, Object _fs) {
+ HostFS fs = (HostFS) _fs;
+ return fs.new HostDirFD(f);
}
-
- // FEATURE: Probably should make this more general - support mountpoints, etc
- /*public class UnixOverlayFS extends FS {
- private final FS root;
- private final FS dev = new DevFS();
- public UnixOverlayFS(FS root) {
- this.root = root;
- }
- private String devPath(String path) {
- if(path.startsWith("/dev")) {
- if(path.length() == 4) return "/";
- if(path.charAt(4) == '/') return path.substring(4);
- }
- return null;
- }
- public FD open(String path, int flags, int mode) throws IOException{
- String dp = devPath(path);
- return dp == null ? root.open(path,flags,mode) : dev.open(dp,flags,mode);
- }
- public FStat stat(String path) throws IOException {
- String dp = devPath(path);
- return dp == null ? root.stat(path) : dev.stat(dp);
- }
- public void mkdir(String path) throws IOException {
- String dp = devPath(path);
- if(dp == null) root.mkdir(path);
- else dev.mkdir(dp);
- }
- }*/
public static class HostFS extends FS {
+ InodeCache inodes = new InodeCache(4000);
protected File root;
public File getRoot() { return root; }
private static File hostRootDir() {
+ if(getSystemProperty("nestedvm.root") != null) {
+ File f = new File(getSystemProperty("nestedvm.root"));
+ if(f.isDirectory()) return f;
+ // fall through to case below
+ }
String cwd = getSystemProperty("user.dir");
File f = new File(cwd != null ? cwd : ".");
+ if(!f.exists()) throw new Error("Couldn't get File for cwd");
f = new File(f.getAbsolutePath());
while(f.getParent() != null) f = new File(f.getParent());
return f;
}
private File hostFile(String path) {
- if(File.separatorChar != '/') path = path.replace('/',File.separatorChar);
+ char sep = File.separatorChar;
+ if(sep != '/') {
+ char buf[] = path.toCharArray();
+ for(int i=0;i<buf.length;i++) {
+ char c = buf[i];
+ if(c == '/') buf[i] = sep;
+ else if(c == sep) buf[i] = '/';
+ }
+ path = new String(buf);
+ }
return new File(root,path);
}
public HostFS(File root) { this.root = root; }
- // FEATURE: This shares a lot with Runtime.open
- // NOTE: createNewFile is a Java2 function
- public FD _open(String path, int flags, int mode) throws IOException {
+ public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
final File f = hostFile(path);
- if(f.isDirectory()) {
- if((flags&3)!=RD_ONLY) throw new ErrnoException(EACCES);
- return directoryFD(f.list(),path.hashCode());
- }
- if((flags & (O_EXCL|O_CREAT)) == (O_EXCL|O_CREAT))
- if(!f.createNewFile()) throw new ErrnoException(EEXIST);
- if((flags&O_CREAT) == 0 && !f.exists())
- return null;
- final Seekable.File sf = new Seekable.File(f,(flags&3)!=RD_ONLY);
- if((flags&O_TRUNC)!=0) sf.setLength(0);
- return new SeekableFD(sf,mode) {
- protected FStat _fstat() { return new HostFStat(f) {
- public int size() {
- try { return sf.length(); } catch(IOException e) { return 0; }
- }
- };}
- };
+ return r.hostFSOpen(f,flags,mode,this);
+ }
+
+ public void unlink(UnixRuntime r, String path) throws ErrnoException {
+ File f = hostFile(path);
+ if(r.sm != null && !r.sm.allowUnlink(f)) throw new ErrnoException(EPERM);
+ if(!f.exists()) throw new ErrnoException(ENOENT);
+ if(!f.delete()) throw new ErrnoException(EPERM);
}
- public FStat _stat(String path) throws FileNotFoundException {
+ public FStat stat(UnixRuntime r, String path) throws ErrnoException {
File f = hostFile(path);
- if(!f.exists()) throw new FileNotFoundException();
- return new HostFStat(f);
+ if(r.sm != null && !r.sm.allowStat(f)) throw new ErrnoException(EACCES);
+ if(!f.exists()) return null;
+ return r.hostFStat(f,this);
}
- public void _mkdir(String path) throws IOException {
+ public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
File f = hostFile(path);
+ if(r.sm != null && !r.sm.allowWrite(f)) throw new ErrnoException(EACCES);
if(f.exists() && f.isDirectory()) throw new ErrnoException(EEXIST);
if(f.exists()) throw new ErrnoException(ENOTDIR);
File parent = f.getParentFile();
if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
if(!f.mkdir()) throw new ErrnoException(EIO);
}
+
+ public class HostDirFD extends DirFD {
+ private final File f;
+ private final File[] children;
+ public HostDirFD(File f) { this.f = f; children = f.listFiles(); }
+ public int size() { return children.length; }
+ public String name(int n) { return children[n].getName(); }
+ public int inode(int n) { return inodes.get(children[n].getAbsolutePath()); }
+ public int parentInode() {
+ File parent = f.getParentFile();
+ return parent == null ? -1 : inodes.get(parent.getAbsolutePath());
+ }
+ public int myInode() { return inodes.get(f.getAbsolutePath()); }
+ public int myDev() { return devno; }
+ }
+ }
+
+ private static void putInt(byte[] buf, int off, int n) {
+ buf[off+0] = (byte)((n>>>24)&0xff);
+ buf[off+1] = (byte)((n>>>16)&0xff);
+ buf[off+2] = (byte)((n>>> 8)&0xff);
+ buf[off+3] = (byte)((n>>> 0)&0xff);
+ }
+
+ public static abstract class DirFD extends FD {
+ private int pos = -2;
+
+ protected abstract int size();
+ protected abstract String name(int n);
+ protected abstract int inode(int n);
+ protected abstract int myDev();
+ protected int parentInode() { return -1; }
+ protected int myInode() { return -1; }
+
+ public int getdents(byte[] buf, int off, int len) {
+ int ooff = off;
+ int ino;
+ int reclen;
+ OUTER: for(;len > 0 && pos < size();pos++){
+ switch(pos) {
+ case -2:
+ case -1:
+ ino = pos == -1 ? parentInode() : myInode();
+ if(ino == -1) continue;
+ reclen = 9 + (pos == -1 ? 2 : 1);
+ if(reclen > len) break OUTER;
+ buf[off+8] = '.';
+ if(pos == -1) buf[off+9] = '.';
+ break;
+ default: {
+ String f = name(pos);
+ byte[] fb = getBytes(f);
+ reclen = fb.length + 9;
+ if(reclen > len) break OUTER;
+ ino = inode(pos);
+ System.arraycopy(fb,0,buf,off+8,fb.length);
+ }
+ }
+ buf[off+reclen-1] = 0; // null terminate
+ reclen = (reclen + 3) & ~3; // add padding
+ putInt(buf,off,reclen);
+ putInt(buf,off+4,ino);
+ off += reclen;
+ len -= reclen;
+ }
+ return off-ooff;
+ }
+
+ protected FStat _fstat() {
+ return new FStat() {
+ public int type() { return S_IFDIR; }
+ public int inode() { return myInode(); }
+ public int dev() { return myDev(); }
+ };
+ }
}
- private static class DevFStat extends FStat {
- public int dev() { return 1; }
- public int mode() { return 0666; }
- public int type() { return S_IFCHR; }
- public int nlink() { return 1; }
- }
- private static FD devZeroFD = new FD() {
- public boolean readable() { return true; }
- public boolean writable() { return true; }
- public int read(byte[] a, int off, int length) { Arrays.fill(a,off,off+length,(byte)0); return length; }
- public int write(byte[] a, int off, int length) { return length; }
- public int seek(int n, int whence) { return 0; }
- public FStat _fstat() { return new DevFStat(); }
- };
- private static FD devNullFD = new FD() {
- public boolean readable() { return true; }
- public boolean writable() { return true; }
- public int read(byte[] a, int off, int length) { return 0; }
- public int write(byte[] a, int off, int length) { return length; }
- public int seek(int n, int whence) { return 0; }
- public FStat _fstat() { return new DevFStat(); }
- };
-
- public class DevFS extends FS {
- public FD _open(String path, int mode, int flags) throws IOException {
+ public static class DevFS extends FS {
+ private static final int ROOT_INODE = 1;
+ private static final int NULL_INODE = 2;
+ private static final int ZERO_INODE = 3;
+ private static final int FD_INODE = 4;
+ private static final int FD_INODES = 32;
+
+ private class DevFStat extends FStat {
+ public int dev() { return devno; }
+ public int mode() { return 0666; }
+ public int type() { return S_IFCHR; }
+ public int nlink() { return 1; }
+ }
+
+ private abstract class DevDirFD extends DirFD {
+ public int myDev() { return devno; }
+ }
+
+ private FD devZeroFD = new FD() {
+ public boolean readable() { return true; }
+ public boolean writable() { return true; }
+ public int read(byte[] a, int off, int length) { Arrays.fill(a,off,off+length,(byte)0); return length; }
+ public int write(byte[] a, int off, int length) { return length; }
+ public int seek(int n, int whence) { return 0; }
+ public FStat _fstat() { return new DevFStat(){ public int inode() { return ZERO_INODE; } }; }
+ };
+ private FD devNullFD = new FD() {
+ public boolean readable() { return true; }
+ public boolean writable() { return true; }
+ public int read(byte[] a, int off, int length) { return 0; }
+ public int write(byte[] a, int off, int length) { return length; }
+ public int seek(int n, int whence) { return 0; }
+ public FStat _fstat() { return new DevFStat(){ public int inode() { return NULL_INODE; } }; }
+ };
+
+ public FD open(UnixRuntime r, String path, int mode, int flags) throws ErrnoException {
if(path.equals("null")) return devNullFD;
if(path.equals("zero")) return devZeroFD;
if(path.startsWith("fd/")) {
try {
n = Integer.parseInt(path.substring(4));
} catch(NumberFormatException e) {
- throw new FileNotFoundException();
+ return null;
}
- if(n < 0 || n >= OPEN_MAX) throw new FileNotFoundException();
- if(fds[n] == null) throw new FileNotFoundException();
- return fds[n].dup();
+ if(n < 0 || n >= OPEN_MAX) return null;
+ if(r.fds[n] == null) return null;
+ return r.fds[n].dup();
}
if(path.equals("fd")) {
int count=0;
- for(int i=0;i<OPEN_MAX;i++) if(fds[i] != null) count++;
- String[] files = new String[count];
+ for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) { count++; }
+ final int[] files = new int[count];
count = 0;
- for(int i=0;i<OPEN_MAX;i++) if(fds[i] != null) files[count++] = Integer.toString(i);
- return directoryFD(files,hashCode());
+ for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = i;
+ return new DevDirFD() {
+ public int myInode() { return FD_INODE; }
+ public int parentInode() { return ROOT_INODE; }
+ public int inode(int n) { return FD_INODES + n; }
+ public String name(int n) { return Integer.toString(files[n]); }
+ public int size() { return files.length; }
+ };
}
if(path.equals("")) {
- String[] files = { "null", "zero", "fd" };
- return directoryFD(files,hashCode());
+ return new DevDirFD() {
+ public int myInode() { return ROOT_INODE; }
+ // FEATURE: Get the real parent inode somehow
+ public int parentInode() { return -1; }
+ public int inode(int n) {
+ switch(n) {
+ case 0: return NULL_INODE;
+ case 1: return ZERO_INODE;
+ case 2: return FD_INODE;
+ default: return -1;
+ }
+ }
+
+ public String name(int n) {
+ switch(n) {
+ case 0: return "null";
+ case 1: return "zero";
+ case 2: return "fd";
+ default: return null;
+ }
+ }
+ public int size() { return 3; }
+ };
}
- throw new FileNotFoundException();
+ return null;
}
- public FStat _stat(String path) throws IOException {
+ public FStat stat(UnixRuntime r,String path) throws ErrnoException {
if(path.equals("null")) return devNullFD.fstat();
if(path.equals("zero")) return devZeroFD.fstat();
if(path.startsWith("fd/")) {
try {
n = Integer.parseInt(path.substring(4));
} catch(NumberFormatException e) {
- throw new FileNotFoundException();
+ return null;
}
- if(n < 0 || n >= OPEN_MAX) throw new FileNotFoundException();
- if(fds[n] == null) throw new FileNotFoundException();
- return fds[n].fstat();
+ if(n < 0 || n >= OPEN_MAX) return null;
+ if(r.fds[n] == null) return null;
+ return r.fds[n].fstat();
}
+ // FEATURE: inode stuff
if(path.equals("fd")) return new FStat() { public int type() { return S_IFDIR; } public int mode() { return 0444; }};
if(path.equals("")) return new FStat() { public int type() { return S_IFDIR; } public int mode() { return 0444; }};
- throw new FileNotFoundException();
+ return null;
}
- public void _mkdir(String path) throws IOException { throw new ErrnoException(EACCES); }
- }
+ public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException { throw new ErrnoException(EROFS); }
+ public void unlink(UnixRuntime r, String path) throws ErrnoException { throw new ErrnoException(EROFS); }
+ }
}
projects / nestedvm.git / blobdiff