package org.ibex.nestedvm;
import org.ibex.nestedvm.util.*;
-// HACK: This is ugly, this stuff needs to be in org.ibex.util or something
-import org.ibex.classgen.util.Sort;
import java.io.*;
import java.util.*;
import java.net.*;
if(!exec) {
gs = defaultGS;
String userdir = Platform.getProperty("user.dir");
- String nvroot = Platform.getProperty("nestedvm.root");
- cwd = "";
- if(userdir != null && nvroot == null) {
- if(userdir.startsWith("/") && File.separatorChar == '/') {
- cwd = userdir.substring(1);
- } else {
- Vector vec = new Vector();
- File root = HostFS.hostRootDir();
- String s = new File(userdir).getAbsolutePath();
- File d = new File(s);
- System.err.println(s);
- System.err.println(d);
- while(!d.equals(root)) {
- vec.addElement(d.getName());
- if((s = d.getParent()) == null) break;
- d = new File(s);
- }
- if(s != null)
- for(int i=vec.size()-1;i>=0;i--) cwd += (String) vec.elementAt(i) + (i==0?"":"/");
- }
- }
+ cwd = userdir == null ? null : gs.mapHostPath(userdir);
+ if(cwd == null) cwd = "/";
+ cwd = cwd.substring(1);
}
}
}
String[] createEnv(String[] extra) {
- String[] defaults = new String[6];
+ String[] defaults = new String[7];
int n=0;
if(extra == null) extra = new String[0];
+ String tmp;
if(!envHas("USER",extra) && Platform.getProperty("user.name") != null)
defaults[n++] = "USER=" + Platform.getProperty("user.name");
- if(!envHas("HOME",extra) && Platform.getProperty("user.home") != null)
- defaults[n++] = "HOME=" + Platform.getProperty("user.home");
+ if(!envHas("HOME",extra) && (tmp=Platform.getProperty("user.home")) != null && (tmp=gs.mapHostPath(tmp)) != null)
+ defaults[n++] = "HOME=" + tmp;
+ if(!envHas("TMPDIR",extra) && (tmp=Platform.getProperty("java.io.tmpdir")) != null && (tmp=gs.mapHostPath(tmp)) != null)
+ defaults[n++] = "TMPDIR=" + tmp;
if(!envHas("SHELL",extra)) defaults[n++] = "SHELL=/bin/sh";
if(!envHas("TERM",extra) && !win32Hacks) defaults[n++] = "TERM=vt100";
if(!envHas("TZ",extra)) defaults[n++] = "TZ=" + posixTZ();
case SYS_fchown: return sys_fchown(a,b,c);
case SYS_chmod: return sys_chmod(a,b,c);
case SYS_fchmod: return sys_fchmod(a,b,c);
+ case SYS_fcntl: return sys_fcntl_lock(a,b,c);
case SYS_umask: return sys_umask(a);
default: return super._syscall(syscall,a,b,c,d,e,f);
copyout(buf,addr,n);
return n;
}
-
+
+ void _closedFD(FD fd) {
+ // release all fcntl locks on this file
+ Seekable s = fd.seekable();
+ if (s == null) return;
+
+ try {
+ for (int i=0; i < gs.locks.length; i++) {
+ Seekable.Lock l = gs.locks[i];
+ if (l == null) continue;
+ if (s.equals(l.seekable()) && l.getOwner() == this) {
+ l.release();
+ gs.locks[i] = null;
+ }
+ }
+ } catch (IOException e) { throw new RuntimeException(e); }
+ }
+
+ /** Implements the F_GETLK and F_SETLK cases of fcntl syscall.
+ * If l_start = 0 and l_len = 0 the lock refers to the entire file.
+ * Uses GlobalState to ensure locking across processes in the same JVM.
+ struct flock {
+ short l_type; // lock type: F_UNLCK, F_RDLCK, F_WRLCK
+ short l_whence; // type of l_start: SEEK_SET, SEEK_CUR, SEEK_END
+ long l_start; // starting offset, bytes
+ long l_len; // len = 0 means until EOF
+ short l_pid; // lock owner
+ short l_xxx; // padding
+ };
+ */
+ private int sys_fcntl_lock(int fdn, int cmd, int arg) throws FaultException{
+ if (cmd != F_GETLK && cmd != F_SETLK) return sys_fcntl(fdn, cmd, arg);
+
+ if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
+ if(fds[fdn] == null) return -EBADFD;
+ FD fd = fds[fdn];
+
+ if (arg == 0) return -EINVAL;
+ int word = memRead(arg);
+ int l_start = memRead(arg+4);
+ int l_len = memRead(arg+8);
+ int l_type = word>>16;
+ int l_whence = word&0x00ff;
+
+ Seekable.Lock[] locks = gs.locks;
+ Seekable s = fd.seekable();
+ if (s == null) return -EINVAL;
+
+ try {
+
+ switch (l_whence) {
+ case SEEK_SET: break;
+ case SEEK_CUR: l_start += s.pos(); break;
+ case SEEK_END: l_start += s.length(); break;
+ default: return -1;
+ }
+
+ if (cmd == F_GETLK) {
+ // The simple Java file locking below will happily return
+ // a lock that overlaps one already held by the JVM. Thus
+ // we must check over all the locks held by other Runtimes
+ for (int i=0; i < locks.length; i++) {
+ if (locks[i] == null || !s.equals(locks[i].seekable()))
+ continue;
+ if (!locks[i].overlaps(l_start, l_len))
+ continue;
+ if (locks[i].getOwner() == this)
+ continue;
+ if (locks[i].isShared() && l_type == F_RDLCK)
+ continue;
+
+ // overlapping lock held by another process
+ return 0;
+ }
+
+ // check if an area is lockable by attempting to obtain a lock
+ Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
+
+ if (lock != null) { // no lock exists
+ memWrite(arg, SEEK_SET|(F_UNLCK<<16));
+ lock.release();
+ }
+
+ return 0;
+ }
+
+ // now processing F_SETLK
+ if (cmd != F_SETLK) return -EINVAL;
+
+ if (l_type == F_UNLCK) {
+ // release all locks that fall within the boundaries given
+ for (int i=0; i < locks.length; i++) {
+ if (locks[i] == null || !s.equals(locks[i].seekable()))
+ continue;
+ if (locks[i].getOwner() != this) continue;
+
+ int pos = (int)locks[i].position();
+ if (pos < l_start) continue;
+ if (l_start != 0 && l_len != 0) // start/len 0 means unlock all
+ if (pos + locks[i].size() > l_start + l_len)
+ continue;
+
+ locks[i].release();
+ locks[i] = null;
+ }
+ return 0;
+
+ } else if (l_type == F_RDLCK || l_type == F_WRLCK) {
+ // first see if a lock already exists
+ for (int i=0; i < locks.length; i++) {
+ if (locks[i] == null || !s.equals(locks[i].seekable()))
+ continue;
+
+ if (locks[i].getOwner() == this) {
+ // if this Runtime owns an overlapping lock work with it
+ if (locks[i].contained(l_start, l_len)) {
+ locks[i].release();
+ locks[i] = null;
+ } else if (locks[i].contains(l_start, l_len)) {
+ if (locks[i].isShared() == (l_type == F_RDLCK)) {
+ // return this more general lock
+ memWrite(arg+4, (int)locks[i].position());
+ memWrite(arg+8, (int)locks[i].size());
+ return 0;
+ } else {
+ locks[i].release();
+ locks[i] = null;
+ }
+ }
+ } else {
+ // if another Runtime has an lock and it is exclusive or
+ // we want an exclusive lock then fail
+ if (locks[i].overlaps(l_start, l_len)
+ && (!locks[i].isShared() || l_type == F_WRLCK))
+ return -EAGAIN;
+ }
+ }
+
+ // create the lock
+ Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
+ if (lock == null) return -EAGAIN;
+ lock.setOwner(this);
+
+ int i;
+ for (i=0; i < locks.length; i++)
+ if (locks[i] == null) break;
+ if (i == locks.length) return -ENOLCK;
+ locks[i] = lock;
+ return 0;
+
+ } else {
+ return -EINVAL;
+ }
+
+ } catch (IOException e) { throw new RuntimeException(e); }
+ }
+
static class SocketFD extends FD {
public static final int TYPE_STREAM = 0;
public static final int TYPE_DGRAM = 1;
final UnixRuntime[] tasks;
int nextPID = 1;
+ /** Table of all current file locks held by this process. */
+ Seekable.Lock[] locks = new Seekable.Lock[16];
+
private MP[] mps = new MP[0];
private FS root;
public GlobalState(int maxProcs, boolean defaultMounts) {
tasks = new UnixRuntime[maxProcs+1];
if(defaultMounts) {
- addMount("/",new HostFS());
+ File root = null;
+ if(Platform.getProperty("nestedvm.root") != null) {
+ root = new File(Platform.getProperty("nestedvm.root"));
+ if(!root.isDirectory()) throw new IllegalArgumentException("nestedvm.root is not a directory");
+ } else {
+ String cwd = Platform.getProperty("user.dir");
+ root = Platform.getRoot(new File(cwd != null ? cwd : "."));
+ }
+
+ addMount("/",new HostFS(root));
+
+ if(Platform.getProperty("nestedvm.root") == null) {
+ File[] roots = Platform.listRoots();
+ for(int i=0;i<roots.length;i++) {
+ String name = roots[i].getPath();
+ if(name.endsWith(File.separator))
+ name = name.substring(0,name.length()-1);
+ if(name.length() == 0 || name.indexOf('/') != -1) continue;
+ addMount("/" + name.toLowerCase(),new HostFS(roots[i]));
+ }
+ }
+
addMount("/dev",new DevFS());
addMount("/resource",new ResourceFS());
}
}
+ public String mapHostPath(String s) { return mapHostPath(new File(s)); }
+ public String mapHostPath(File f) {
+ MP[] list;
+ FS root;
+ synchronized(this) { mps = this.mps; root = this.root; }
+ if(!f.isAbsolute()) f = new File(f.getAbsolutePath());
+ for(int i=mps.length;i>=0;i--) {
+ FS fs = i == mps.length ? root : mps[i].fs;
+ String path = i == mps.length ? "" : mps[i].path;
+ if(!(fs instanceof HostFS)) continue;
+ File fsroot = ((HostFS)fs).getRoot();
+ if(!fsroot.isAbsolute()) fsroot = new File(fsroot.getAbsolutePath());
+ if(f.getPath().startsWith(fsroot.getPath())) {
+ char sep = File.separatorChar;
+ String child = f.getPath().substring(fsroot.getPath().length());
+ if(sep != '/') {
+ char[] child_ = child.toCharArray();
+ for(int j=0;j<child_.length;j++) {
+ if(child_[j] == '/') child_[j] = sep;
+ else if(child_[j] == sep) child_[j] = '/';
+ }
+ child = new String(child_);
+ }
+ String mapped = "/" + (path.length()==0?"":path+"/") + child;
+ return mapped;
+ }
+ }
+ return null;
+ }
+
static class MP implements Sort.Comparable {
public MP(String path, FS fs) { this.path = path; this.fs = fs; }
public String path;
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) {
public abstract void unlink(UnixRuntime r, String path) throws ErrnoException;
}
- // chroot support should go in here if it is ever implemented chroot support in here
+ // chroot support should go in here if it is ever implemented
private String normalizePath(String path) {
boolean absolute = path.startsWith("/");
int cwdl = cwd.length();
protected File root;
public File getRoot() { return root; }
- static File hostRootDir() {
- if(Platform.getProperty("nestedvm.root") != null) {
- File f = new File(Platform.getProperty("nestedvm.root"));
- if(f.isDirectory()) return f;
- // fall through to case below
- }
- String cwd = Platform.getProperty("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());
- // This works around a bug in some versions of ClassPath
- if(f.getPath().length() == 0) f = new File("/");
- return f;
- }
-
private File hostFile(String path) {
char sep = File.separatorChar;
if(sep != '/') {
return new File(root,path);
}
- public HostFS() { this(hostRootDir()); }
public HostFS(String root) { this(new File(root)); }
public HostFS(File root) { this.root = root; }
-
public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
final File f = hostFile(path);
return r.hostFSOpen(f,flags,mode,this);