import java.io.*;
import java.util.*;
+// FEATURE: Remove System.{out,err}.printlns and throw Errors where applicable
+
// 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: Throw ErrnoException and catch in syscall whereever possible
-// (only in cases where we've already paid the price for a throw)
-
public abstract class UnixRuntime extends Runtime implements Cloneable {
/** The pid of this "process" */
private int pid;
- private int ppid;
+ private UnixRuntime parent;
protected int getPid() { return pid; }
- /** processes filesystem */
- private FS fs;
- public FS getFS() { return fs; }
- public void setFS(FS fs) {
- if(state != STOPPED) throw new IllegalStateException("Can't change fs while process is running");
- this.fs = fs;
- }
+ private static final GlobalState defaultGD = new GlobalState();
+ private GlobalState gd = defaultGD;
/** proceses' current working directory - absolute path WITHOUT leading slash
"" = root, "bin" = /bin "usr/bin" = /usr/bin */
/** The runtime that should be run next when in state == EXECED */
private UnixRuntime execedRuntime;
-
- /* 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; }
- }
- }
+
+ private Object children; // used only for synchronizatin
+ private Vector activeChildren;
+ private Vector exitedChildren;
public UnixRuntime(int pageSize, int totalPages) {
super(pageSize,totalPages);
-
- FS root = new HostFS();
- FS dev = new DevFS();
- MountPointFS mounts = new MountPointFS(root);
- mounts.add("/dev",dev);
- fs = mounts;
-
+
// FEATURE: Do the proper mangling for non-unix hosts
String userdir = getSystemProperty("user.dir");
cwd = userdir != null && userdir.startsWith("/") && File.separatorChar == '/' ? userdir.substring(1) : "";
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 == EXITED) removeTask(tasks[i]);
- else tasks[i].ppid = 0;
- }
+ protected void _started() {
+ UnixRuntime[] tasks = gd.tasks;
+ synchronized(gd) {
+ if(pid != 0) {
+ if(tasks[pid] == null || tasks[pid].pid != pid) throw new Error("should never happen");
+ } else {
+ int newpid = -1;
+ int nextPID = gd.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;
+ gd.nextPID = newpid + 1;
}
- state = EXITED;
- 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_dup2: return sys_dup2(a,b);
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);
- 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);
+ protected FD _open(String path, int flags, int mode) throws ErrnoException {
+ return gd.open(this,normalizePath(path),flags,mode);
}
- // 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.
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 {
+ System.err.println("PID: " + this.pid + " is waiting on " + pid);
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) {
+ System.err.println("WARNING: waitpid called with a pid of " + pid);
+ return -ECHILD;
+ }
+ boolean blocking = (options&WNOHANG)==0;
+
+ if(pid !=-1 && (pid <= 0 || pid >= gd.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 == EXITED) {
- task = tasks[i];
- break;
- }
+ if(exitedChildren.size() > 0) done = (UnixRuntime)exitedChildren.remove(exitedChildren.size() - 1);
+ } else if(pid > 0) {
+ UnixRuntime t = gd.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 == EXITED) {
- 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 {
+ gd.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;
+ }
+
+
+ protected void _exited() {
+ if(children != null) synchronized(children) {
+ for(Enumeration e = exitedChildren.elements(); e.hasMoreElements(); ) {
+ UnixRuntime child = (UnixRuntime) e.nextElement();
+ gd.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) {
+ gd.tasks[pid] = null;
+ } else {
+ synchronized(_parent.children) {
+ if(parent == null) {
+ gd.tasks[pid] = null;
+ } else {
+ parent.activeChildren.remove(this);
+ parent.exitedChildren.add(this);
+ parent.children.notify();
+ }
}
}
}
protected Object clone() throws CloneNotSupportedException {
UnixRuntime r = (UnixRuntime) super.clone();
- r.pid = r.ppid = 0;
+ r.pid = 0;
+ r.parent = null;
+ r.children = null;
+ r.activeChildren = r.exitedChildren = null;
return r;
}
e.printStackTrace();
return -ENOMEM;
}
-
- int childPID = addTask(r);
- if(childPID < 0) return -ENOMEM;
-
- r.ppid = pid;
+
+ 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();
+ }
+ 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();
- }
- }
- }.start();
+ new ForkedProcess(r);
- return childPID;
+ 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)); }
return a;
}
- // FEATURE: call the syscall just "exec"
- private int sys_execve(int cpath, int cargv, int cenvp) {
- try {
- return exec(normalizePath(cstring(cpath)),readStringArray(cargv),readStringArray(cenvp));
- } catch(FaultException e) {
- return -EFAULT;
- }
+ 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 path, String[] argv, String[] envp) {
- if(argv.length == 0) argv = new String[]{""};
- Seekable s;
- FD fd;
-
- try {
- fd = fs.open(path,RD_ONLY,0);
- System.err.println(fd + " " + path);
- if(fd == null) return -ENOENT;
- s = fd.seekable();
- if(s == null) return -ENOEXEC;
- }
- 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; }
- try {
- int p = 0;
- byte[] buf = new byte[4096];
- OUTER: for(;;) {
- int n = s.read(buf,p,buf.length-p);
- if(n == -1) break;
- for(;n > 0; n--) if(buf[p++] == '\n' || p == 4096) break OUTER;
- }
- if(buf[0] == '!' && buf[1] == '#') {
- String cmd = new String(buf,2,p-2);
- String argv1 = null;
- if((p = cmd.indexOf(' ')) != -1) {
- do { p++; } while(cmd.charAt(p)==' ');
- argv1 = cmd.substring(p);
- cmd = cmd.substring(0,p-1);
- }
- String[] newArgv = new String[argv.length + argv1 != null ? 2 : 1];
- p = 0;
- newArgv[p++] = argv[0];
- if(argv1 != null) newArgv[p++] = argv1;
- newArgv[p++] = path;
- for(int i=1;i<argv.length;i++) newArgv[p++] = argv[i];
- fd.close();
- return exec(cmd,newArgv,envp);
- } else if(buf[0] == '\177' && buf[1] == 'E' && buf[2] == 'L' && buf[3] == 'F') {
- s.seek(0);
- UnixRuntime r = new Interpreter(s);
- fd.close();
- return exec(r,argv,envp);
- } else {
- return -ENOEXEC;
+ private int exec(String normalizedPath, String[] argv, String[] envp) throws ErrnoException {
+ if(argv.length == 0) argv = new String[]{""};
+
+ Object o = gd.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;
}
- } catch(IOException e) {
- e.printStackTrace();
- return -ENOEXEC;
+ } 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) {
+ 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;
fds = null;
closeOnExec = null;
+ r.gd = gd;
+ r.sm = sm;
r.cwd = cwd;
- r.fs = fs;
r.pid = pid;
- r.ppid = ppid;
+ r.parent = parent;
r.start(argv,envp);
-
+
state = EXECED;
execedRuntime = r;
}
// FEATURE: Use custom PipeFD - be sure to support PIPE_BUF of data
- private int sys_pipe(int addr) {
+ private int sys_pipe(int addr) throws FaultException {
PipedOutputStream writerStream = new PipedOutputStream();
PipedInputStream readerStream;
try {
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_stat(int cstring, int addr) throws FaultException, ErrnoException {
+ FStat s = gd.stat(this,normalizePath(cstring(cstring)));
+ if(s == null) return -ENOENT;
+ return stat(s,addr);
}
+ private int sys_lstat(int cstring, int addr) throws FaultException, ErrnoException {
+ FStat s = gd.lstat(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_mkdir(int cstring, int mode) throws FaultException, ErrnoException {
+ gd.mkdir(this,normalizePath(cstring(cstring)),mode);
+ 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(gd.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 != STOPPED) 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();
+
+ // 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 LSTAT = 3;
+ protected static final int MKDIR = 4;
+
+ // Make this protected (need to fix _exit)
+ private final UnixRuntime[] tasks;
+ private int nextPID = 1;
+
+ private final MP[][] mps = new MP[128][];
+ 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) {
+ root = new HostFS();
+ addMount("/dev",new DevFS());
+ }
}
- cwd = dir;
- }
- 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); }
+ 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);
+ }
+ }
- protected static final int OPEN = 1;
- protected static final int STAT = 2;
- protected static final int MKDIR = 3;
+ 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);
+ 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 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(path.equals("/")) { root = fs; return; }
+ path = path.substring(1);
+ 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 synchronized void removeMount(String path) {
+ if(getMount(path) == null) throw new IllegalArgumentException("mount point doesn't exist");
+ if(!path.startsWith("/")) throw new IllegalArgumentException("Mount point doesn't start with a /");
+ if(path.equals("/")) { root = null; return; }
+ path = path.substring(1);
+ 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;
+ }
+
+ private Object fsop(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
+ 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(path.startsWith(mp.path) && (pl == mpl || (pl < mpl && path.charAt(mpl) == '/')))
+ return dispatch(mp.fs,op,r,pl == mpl ? "" : path.substring(mpl+1),arg1,arg2);
+ }
+ }
+ }
+ return dispatch(root,op,r,path,arg1,arg2);
+ }
- 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");
- }
+ 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;
+ default: throw new Error("should never happen");
+ }
}
- 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); }
+ 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); }
-
+ 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 {
+ 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 Error("zero length file");
+
+ 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) {
+ throw new ErrnoException(ENOEXEC);
+ } catch(IOException e) {
+ 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 {
// FEATURE: inode stuff
// FEATURE: Implement whatever is needed to get newlib's opendir and friends to work - that patch is a pain
- protected static FD directoryFD(String[] files, int hashCode) throws IOException {
+ protected static FD directoryFD(String[] files, int hashCode) {
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);
+ try {
+ 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);
+ }
+ } catch(IOException e) {
+ return null;
}
final byte[] data = bos.toByteArray();
return new SeekableFD(new Seekable.ByteArray(data,false),RD_ONLY) {
}; }
};
}
+
+ 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;
}
private String normalizePath(String path) {
//System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
return new String(out,0,outp);
}
+
+ // FEATURE: override Runtime.hostFStat to add executable type checking
+ // hostFStat
+ /* try {
+ FileInputStream fis = new FileInputStream(f);
+ switch(fis.read()) {
+ case '\177': _executable = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
+ case '#': _executable = fis.read() == '!';
+ }
+ fis.close();
+ } catch(IOException e) { }
+ */
+
+ // FEATURE: inode stuff
+ FD hostFSDirFD(File f) { return FS.directoryFD(f.list(),f.hashCode()); }
- 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 synchronized 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 synchronized 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 synchronized 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);
- }
- }
- return root.op(op,path,arg1,arg2);
- }
- }
-
public static class HostFS extends FS {
protected File root;
public File getRoot() { return root; }
return f;
}
- File hostFile(String path) {
+ private File hostFile(String path) {
char sep = File.separatorChar;
if(sep != '/') {
char buf[] = path.toCharArray();
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);
- System.err.println(path + " -> " + f + " " + f.exists());
- 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);
}
- 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);
}
- 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();
}
}
- 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(); }
- };
-
- // FIXME: Support /dev/fd (need to have syscalls pass along Runtime instance)
public static class DevFS extends FS {
- public FD _open(String path, int mode, int flags) throws IOException {
+ 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 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/")) {
+ if(path.startsWith("fd/")) {
int n;
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++;
+ for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) count++;
String[] files = new String[count];
count = 0;
- for(int i=0;i<OPEN_MAX;i++) if(fds[i] != null) files[count++] = Integer.toString(i);
+ for(int i=0;i<OPEN_MAX;i++) if(r.fds[i] != null) files[count++] = Integer.toString(i);
return directoryFD(files,hashCode());
- }*/
+ }
if(path.equals("")) {
String[] files = { "null", "zero", "fd" };
return directoryFD(files,hashCode());
}
- 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/")) {
+ if(path.startsWith("fd/")) {
int n;
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();
}
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(EACCES); }
}
}
projects / nestedvm.git / blobdiff