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jace/src/main/java/org/ibex/nestedvm/UnixRuntime.java

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// Copyright 2000-2005 the Contributors, as shown in the revision logs.
// Licensed under the Apache Public Source License 2.0 ("the License").
// You may not use this file except in compliance with the License.
package org.ibex.nestedvm;
import org.ibex.nestedvm.util.*;
import java.io.*;
import java.util.*;
import java.net.*;
import java.nio.file.*;
import java.lang.reflect.*; // For lazily linked RuntimeCompiler
// FEATURE: vfork
public abstract class UnixRuntime extends Runtime implements Cloneable {
/** The pid of this "process" */
private int pid;
private UnixRuntime parent;
public final int getPid() {
return pid;
}
private static final GlobalState defaultGS = new GlobalState();
private GlobalState gs;
public void setGlobalState(GlobalState gs) {
if(state != STOPPED) throw new IllegalStateException("can't change GlobalState when running");
if(gs == null) throw new NullPointerException("gs is null");
this.gs = gs;
}
/** proceses' current working directory - absolute path WITHOUT leading slash
"" = root, "bin" = /bin "usr/bin" = /usr/bin */
private String cwd;
/** The runtime that should be run next when in state == EXECED */
private UnixRuntime execedRuntime;
private Object children; // used only for synchronizatin
private Vector<UnixRuntime> activeChildren;
private Vector<UnixRuntime> exitedChildren;
protected UnixRuntime(int pageSize, int totalPages) {
this(pageSize,totalPages,false);
}
protected UnixRuntime(int pageSize, int totalPages, boolean exec) {
super(pageSize,totalPages,exec);
if(!exec) {
gs = defaultGS;
String userdir = Platform.getProperty("user.dir");
cwd = userdir == null ? null : gs.mapHostPath(userdir);
if(cwd == null) cwd = "/";
cwd = cwd.substring(1);
}
}
private static String posixTZ() {
StringBuffer sb = new StringBuffer();
TimeZone zone = TimeZone.getDefault();
int off = zone.getRawOffset() / 1000;
sb.append(Platform.timeZoneGetDisplayName(zone,false,false));
if(off > 0) sb.append("-");
else off = -off;
sb.append(off/3600);
off = off%3600;
if(off > 0) sb.append(":").append(off/60);
off=off%60;
if(off > 0) sb.append(":").append(off);
if(zone.useDaylightTime())
sb.append(Platform.timeZoneGetDisplayName(zone,true,false));
return sb.toString();
}
private static boolean envHas(String key,String[] environ) {
for(int i=0; i<environ.length; i++)
if(environ[i]!=null && environ[i].startsWith(key + "=")) return true;
return false;
}
String[] createEnv(String[] extra) {
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) && (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();
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;
}
private static class ProcessTableFullExn extends RuntimeException { }
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.setElementAt(this,i);
}
} 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;
}
tasks[pid] = this;
}
}
protected int _syscall(int syscall, int a, int b, int c, int d, int e, int f) 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_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_link:
return sys_link(a,b);
case SYS_getppid:
return sys_getppid();
case SYS_socket:
return sys_socket(a,b,c);
case SYS_connect:
return sys_connect(a,b,c);
case SYS_resolve_hostname:
return sys_resolve_hostname(a,b,c);
case SYS_setsockopt:
return sys_setsockopt(a,b,c,d,e);
case SYS_getsockopt:
return sys_getsockopt(a,b,c,d,e);
case SYS_getsockname:
return sys_getsockname(a,b,c);
case SYS_getpeername:
return sys_getpeername(a,b,c);
case SYS_bind:
return sys_bind(a,b,c);
case SYS_listen:
return sys_listen(a,b);
case SYS_accept:
return sys_accept(a,b,c);
case SYS_shutdown:
return sys_shutdown(a,b);
case SYS_sysctl:
return sys_sysctl(a,b,c,d,e,f);
case SYS_sendto:
return sys_sendto(a,b,c,d,e,f);
case SYS_recvfrom:
return sys_recvfrom(a,b,c,d,e,f);
case SYS_select:
return sys_select(a,b,c,d,e);
case SYS_access:
return sys_access(a,b);
case SYS_realpath:
return sys_realpath(a,b);
case SYS_chown:
return sys_chown(a,b,c);
case SYS_lchown:
return sys_chown(a,b,c);
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);
case SYS_resolve_ip:
return sys_resolve_ip(a,b,c);
case SYS_rmdir:
return sys_rmdir(a);
case SYS_setsid:
return sys_setsid();
default:
return super._syscall(syscall,a,b,c,d,e,f);
}
}
int sys_resolve_ip(int addr, int ptrCBuf, int size) throws FaultException {
byte[] buffer = new byte[4];
//java.util.logging.Logger.getLogger(getClass().getName()).info("Input address = " + Integer.toString(addr));
buffer[0] = Integer.valueOf((addr >>> 24) & 0xff).byteValue();
buffer[1] = Integer.valueOf((addr >>> 16) & 0xff).byteValue();
buffer[2] = Integer.valueOf((addr >>> 8) & 0xff).byteValue();
buffer[3] = Integer.valueOf((addr >>> 0) & 0xff).byteValue();
String hostName;
try {
hostName = InetAddress.getByAddress(buffer).getHostAddress();
} catch (UnknownHostException ex) {
hostName = java.text.MessageFormat.format("{0}.{1}.{2}.{3}", new Object[] {
Integer.valueOf(buffer[0] & 0xff),
Integer.valueOf(buffer[1] & 0xff),
Integer.valueOf(buffer[2] & 0xff ),
Integer.valueOf( buffer[3] & 0xff )} );
}
//java.util.logging.Logger.getLogger(getClass().getName()).info("Output address = " + hostName);
byte[] outBytes = getBytes(hostName);
if(size == 0) return -EINVAL;
if(size < outBytes.length+1) return -ERANGE;
copyout(outBytes,ptrCBuf,outBytes.length);
memset(ptrCBuf+outBytes.length+1,0,1);
return 0;
}
FD _open(String path, int flags, int mode) throws ErrnoException {
path = normalizePath(path);
FD fd = gs.open(this,path,flags,mode);
if (fd != null && path != null) fd.setNormalizedPath(path);
return fd;
}
private int sys_getppid() {
return parent == null ? 1 : parent.pid;
}
private int sys_setsid() {
return 0;
}
private int sys_chown(int fileAddr, int uid, int gid) {
return 0;
}
private int sys_lchown(int fileAddr, int uid, int gid) {
return 0;
}
private int sys_fchown(int fd, int uid, int gid) {
return 0;
}
private int sys_chmod(int fileAddr, int uid, int gid) {
return 0;
}
private int sys_fchmod(int fd, int uid, int gid) {
return 0;
}
private int sys_umask(int mask) {
return 0;
}
private int sys_access(int cstring, int mode) throws ErrnoException, ReadFaultException {
// FEATURE: sys_access
return gs.stat(this,normalizePath(cstring(cstring))) == null ? -ENOENT : 0;
}
private int sys_realpath(int inAddr, int outAddr) throws FaultException {
String s = normalizePath(cstring(inAddr));
byte[] b = getNullTerminatedBytes(s);
if(b.length > PATH_MAX) return -ERANGE;
copyout(b,outAddr,b.length);
return 0;
}
// FEATURE: Signal handling
// check flag only on backwards jumps to basic blocks without compulsatory checks
// (see A Portable Research Framework for the Execution of Java Bytecode - Etienne Gagnon, Chapter 2)
/** The kill syscall.
SIGSTOP, SIGTSTO, SIGTTIN, and SIGTTOUT pause the process.
SIGCONT, SIGCHLD, SIGIO, and SIGWINCH are ignored.
Anything else terminates the process. */
private int sys_kill(int pid, int signal) {
// This will only be called by raise() in newlib to invoke the default handler
// We don't have to worry about actually delivering the signal
if(pid != pid) return -ESRCH;
if(signal < 0 || signal >= 32) return -EINVAL;
switch(signal) {
case 0:
return 0;
case 17: // SIGSTOP
case 18: // SIGTSTP
case 21: // SIGTTIN
case 22: // SIGTTOU
case 19: // SIGCONT
case 20: // SIGCHLD
case 23: // SIGIO
case 28: // SIGWINCH
break;
default:
exit(128+signal, true);
}
return 0;
}
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 == 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) {
if(exitedChildren.size() > 0) {
done = (UnixRuntime)exitedChildren.elementAt(exitedChildren.size() - 1);
exitedChildren.removeElementAt(exitedChildren.size() - 1);
}
} else if(pid > 0) {
if(pid >= gs.tasks.length) return -ECHILD;
UnixRuntime t = gs.tasks[pid];
if(t.parent != this) return -ECHILD;
if(t.state == EXITED) {
if(!exitedChildren.removeElement(t)) throw new Error("should never happen");
done = t;
}
} else {
// process group stuff, EINVAL returned above
throw new Error("should never happen");
}
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(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.removeAllElements();
for(Enumeration e = activeChildren.elements(); e.hasMoreElements(); ) {
UnixRuntime child = (UnixRuntime) e.nextElement();
child.parent = null;
}
activeChildren.removeAllElements();
}
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.removeElement(this)) throw new Error("should never happen _exited: pid: " + pid);
parent.exitedChildren.addElement(this);
parent.children.notify();
}
}
}
}
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() {
final UnixRuntime r;
try {
r = (UnixRuntime) clone();
} catch(Exception e) {
e.printStackTrace();
return -ENOMEM;
}
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<UnixRuntime>();
exitedChildren = new Vector<UnixRuntime>();
}
activeChildren.addElement(r);
CPUState state = new CPUState();
getCPUState(state);
state.r[V0] = 0; // return 0 to child
state.pc += 4; // skip over syscall instruction
r.setCPUState(state);
r.state = PAUSED;
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 final static Method runtimeCompilerCompile;
static {
Method m;
try {
m = Class.forName("org.ibex.nestedvm.RuntimeCompiler").getMethod("compile",new Class[] {Seekable.class,String.class,String.class});
} catch(NoSuchMethodException e) {
m = null;
} catch(ClassNotFoundException e) {
m = null;
}
runtimeCompilerCompile = m;
}
public Class runtimeCompile(Seekable s, String sourceName) throws IOException {
if(runtimeCompilerCompile == null) {
if(STDERR_DIAG) System.err.println("WARNING: Exec attempted but RuntimeCompiler not found!");
return null;
}
try {
return (Class) runtimeCompilerCompile.invoke(null,new Object[] {s,"unixruntime,maxinsnpermethod=256,lessconstants",sourceName});
} catch(IllegalAccessException e) {
e.printStackTrace();
return null;
} catch(InvocationTargetException e) {
Throwable t = e.getTargetException();
if(t instanceof IOException) throw (IOException) t;
if(t instanceof RuntimeException) throw (RuntimeException) t;
if(t instanceof Error) throw (Error) t;
if(STDERR_DIAG) t.printStackTrace();
return null;
}
}
private int exec(String path, String[] argv, String[] envp) throws ErrnoException {
if(argv.length == 0) argv = new String[] {""};
// HACK: Hideous hack to make a standalone busybox possible
if(path.equals("bin/busybox") && getClass().getName().endsWith("BusyBox"))
return execClass(getClass(),argv,envp);
// 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); }*/
FStat fstat = gs.stat(this,path);
if(fstat == null) return -ENOENT;
GlobalState.CacheEnt ent = (GlobalState.CacheEnt) gs.execCache.get(path);
long mtime = fstat.mtime();
long size = fstat.size();
if(ent != null) {
//System.err.println("Found cached entry for " + path);
if(ent.time ==mtime && ent.size == size) {
if(ent.o instanceof Class)
return execClass((Class) ent.o,argv,envp);
if(ent.o instanceof String[])
return execScript(path,(String[]) ent.o,argv,envp);
throw new Error("should never happen");
}
//System.err.println("Cache was out of date");
gs.execCache.remove(path);
}
FD fd = gs.open(this,path,RD_ONLY,0);
if(fd == null) throw new ErrnoException(ENOENT);
Seekable s = fd.seekable();
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);
if(buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F') return -ENOEXEC;
s.seek(0);
if(STDERR_DIAG) System.err.println("Running RuntimeCompiler for " + path);
Class c = runtimeCompile(s,path);
if(STDERR_DIAG) System.err.println("RuntimeCompiler finished for " + path);
if(c == null) throw new ErrnoException(ENOEXEC);
gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,c));
return execClass(c,argv,envp);
case '#':
if(n == 1) {
int n2 = s.read(buf,1,buf.length-1);
if(n2 == -1) return -ENOEXEC;
n += n2;
}
if(buf[1] != '!') return -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);
}
int cmdStart = 2;
for(; cmdStart<p; cmdStart++) if(buf[cmdStart]!=' ') break;
if(cmdStart == p) throw new ErrnoException(ENOEXEC);
int argStart = cmdStart;
for(; argStart<p; argStart++) if(buf[argStart] == ' ') break;
int cmdEnd = argStart;
while(argStart < p && buf[argStart] == ' ') argStart++;
String[] command = new String[] {
new String(buf,cmdStart,cmdEnd-cmdStart),
argStart < p ? new String(buf,argStart,p-argStart) : null
};
gs.execCache.put(path,new GlobalState.CacheEnt(mtime,size,command));
return execScript(path,command,argv,envp);
default:
return -ENOEXEC;
}
} catch(IOException e) {
return -EIO;
} finally {
fd.close();
}
}
public int execScript(String path, String[] command, String[] argv, String[] envp) throws ErrnoException {
String[] newArgv = new String[argv.length-1 + (command[1] != null ? 3 : 2)];
int p = command[0].lastIndexOf('/');
newArgv[0] = p == -1 ? command[0] : command[0].substring(p+1);
newArgv[1] = "/" + path;
p = 2;
if(command[1] != null) newArgv[p++] = command[1];
for(int i=1; i<argv.length; i++) newArgv[p++] = argv[i];
if(p != newArgv.length) throw new Error("p != newArgv.length");
System.err.println("Execing: " + command[0]);
for(int i=0; i<newArgv.length; i++) System.err.println("execing [" + i + "] " + newArgv[i]);
return exec(command[0],newArgv,envp);
}
public int execClass(Class<?> c,String[] argv, String[] envp) {
try {
UnixRuntime r = (UnixRuntime) c.getDeclaredConstructor(new Class[] {Boolean.TYPE}).newInstance(new Object[] {Boolean.TRUE});
return exec(r,argv,envp);
} catch(Exception e) {
e.printStackTrace();
return -ENOEXEC;
}
}
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 0;
}
public static class Pipe {
private final byte[] pipebuf = new byte[PIPE_BUF*4];
private int readPos;
private int writePos;
public final FD reader = new Reader();
public final FD writer = new Writer();
public class Reader extends FD {
protected FStat _fstat() { return new SocketFStat(); }
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 int flags() {
return O_RDONLY;
}
public void _close() {
synchronized(Pipe.this) {
readPos = -1;
Pipe.this.notify();
}
}
}
public class Writer extends FD {
protected FStat _fstat() {
return new SocketFStat();
}
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 int flags() {
return O_WRONLY;
}
public void _close() {
synchronized(Pipe.this) {
writePos = -1;
Pipe.this.notify();
}
}
}
}
private int sys_pipe(int addr) {
Pipe pipe = new Pipe();
int fd1 = addFD(pipe.reader);
if(fd1 < 0) return -ENFILE;
int fd2 = addFD(pipe.writer);
if(fd2 < 0) {
closeFD(fd1);
return -ENFILE;
}
try {
memWrite(addr,fd1);
memWrite(addr+4,fd2);
} catch(FaultException e) {
closeFD(fd1);
closeFD(fd2);
return -EFAULT;
}
return 0;
}
private int sys_dup2(int oldd, int newd) {
if(oldd == newd) return 0;
if(oldd < 0 || oldd >= OPEN_MAX) return -EBADFD;
if(newd < 0 || newd >= OPEN_MAX) return -EBADFD;
if(fds[oldd] == null) return -EBADFD;
if(fds[newd] != null) fds[newd].close();
fds[newd] = fds[oldd].dup();
return 0;
}
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_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_link(int cstring1, int cstring2) throws FaultException, ErrnoException {
gs.link(this,normalizePath(cstring(cstring1)), normalizePath(cstring(cstring2)));
return 0;
}
private int sys_rmdir(int ptrPathName) throws ErrnoException, ReadFaultException {
gs.rmdir(this, normalizePath(cstring(ptrPathName)));
return 0;
}
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;
memset(addr,'/',1);
copyout(b,addr+1,b.length);
memset(addr+b.length+1,0,1);
return addr;
}
private int sys_chdir(int addr) throws ErrnoException, FaultException {
String path = normalizePath(cstring(addr));
FStat st = gs.stat(this,path);
if(st == null) return -ENOENT;
if(st.type() != FStat.S_IFDIR) return -ENOTDIR;
cwd = path;
return 0;
}
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;
}
void _preCloseFD(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);
}
}
void _postCloseFD(FD fd) {
if (fd.isMarkedForDeleteOnClose()) {
try {
gs.unlink(this, fd.getNormalizedPath());
}
catch (Throwable t) {}
}
}
/** 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;
public static final int LISTEN = 2;
public int type() {
return flags & 1;
}
public boolean listen() {
return (flags & 2) != 0;
}
int flags;
int options;
Socket s;
ServerSocket ss;
DatagramSocket ds;
InetAddress bindAddr;
int bindPort = -1;
InetAddress connectAddr;
int connectPort = -1;
DatagramPacket dp;
InputStream is;
OutputStream os;
private static final byte[] EMPTY = new byte[0];
public SocketFD(int type) {
flags = type;
if(type == TYPE_DGRAM)
dp = new DatagramPacket(EMPTY,0);
}
public SocketAddress getLocalSocketAddress() {
int type = type();
if(type == SocketFD.TYPE_STREAM) {
if(listen()) {
return ss.getLocalSocketAddress();
} else {
return s.getLocalSocketAddress();
}
} else {
return ds.getLocalSocketAddress();
}
}
public void setOptions() {
try {
if(s != null && type() == TYPE_STREAM && !listen()) {
Platform.socketSetKeepAlive(s,(options & SO_KEEPALIVE) != 0);
}
} catch(SocketException e) {
if(STDERR_DIAG) e.printStackTrace();
}
}
public void _close() {
try {
if(s != null) s.close();
if(ss != null) ss.close();
if(ds != null) ds.close();
} catch(IOException e) {
/* ignore */
}
}
public int read(byte[] a, int off, int length) throws ErrnoException {
if(type() == TYPE_DGRAM) return recvfrom(a,off,length,null,null);
if(is == null) throw new ErrnoException(EPIPE);
try {
int n = is.read(a,off,length);
return n < 0 ? 0 : n;
} catch(IOException e) {
throw new ErrnoException(EIO);
}
}
public int recvfrom(byte[] a, int off, int length, InetAddress[] sockAddr, int[] port) throws ErrnoException {
if(type() == TYPE_STREAM) return read(a,off,length);
if(off != 0) throw new IllegalArgumentException("off must be 0");
dp.setData(a);
dp.setLength(length);
try {
if(ds == null) ds = new DatagramSocket();
ds.receive(dp);
} catch(IOException e) {
if(STDERR_DIAG) e.printStackTrace();
throw new ErrnoException(EIO);
}
if(sockAddr != null) {
sockAddr[0] = dp.getAddress();
port[0] = dp.getPort();
}
return dp.getLength();
}
public int write(byte[] a, int off, int length) throws ErrnoException {
if(type() == TYPE_DGRAM) return sendto(a,off,length,null,-1);
if(os == null) throw new ErrnoException(EPIPE);
try {
os.write(a,off,length);
return length;
} catch(IOException e) {
throw new ErrnoException(EIO);
}
}
public int sendto(byte[] a, int off, int length, InetAddress destAddr, int destPort) throws ErrnoException {
if(off != 0) throw new IllegalArgumentException("off must be 0");
if(type() == TYPE_STREAM) return write(a,off,length);
if(destAddr == null) {
destAddr = connectAddr;
destPort = connectPort;
if(destAddr == null) throw new ErrnoException(ENOTCONN);
}
dp.setAddress(destAddr);
dp.setPort(destPort);
dp.setData(a);
dp.setLength(length);
try {
if(ds == null) ds = new DatagramSocket();
ds.send(dp);
} catch(IOException e) {
if(STDERR_DIAG) e.printStackTrace();
if("Network is unreachable".equals(e.getMessage())) throw new ErrnoException(EHOSTUNREACH);
throw new ErrnoException(EIO);
}
return dp.getLength();
}
public int flags() {
return O_RDWR;
}
public FStat _fstat() {
return new SocketFStat();
}
}
private int sys_socket(int domain, int type, int proto) {
if(domain != AF_INET || (type != SOCK_STREAM && type != SOCK_DGRAM)) return -EPROTONOSUPPORT;
return addFD(new SocketFD(type == SOCK_STREAM ? SocketFD.TYPE_STREAM : SocketFD.TYPE_DGRAM));
}
private SocketFD getSocketFD(int fdn) throws ErrnoException {
if(fdn < 0 || fdn >= OPEN_MAX) throw new ErrnoException(EBADFD);
if(fds[fdn] == null) throw new ErrnoException(EBADFD);
if(!(fds[fdn] instanceof SocketFD)) throw new ErrnoException(ENOTSOCK);
return (SocketFD) fds[fdn];
}
private int sys_connect(int fdn, int addr, int namelen) throws ErrnoException, FaultException {
SocketFD fd = getSocketFD(fdn);
if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
int word1 = memRead(addr);
if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
int port = word1 & 0xffff;
byte[] ip = new byte[4];
copyin(addr+4,ip,4);
InetAddress inetAddr;
try {
inetAddr = Platform.inetAddressFromBytes(ip);
} catch(UnknownHostException e) {
return -EADDRNOTAVAIL;
}
fd.connectAddr = inetAddr;
fd.connectPort = port;
try {
switch(fd.type()) {
case SocketFD.TYPE_STREAM: {
Socket s = new Socket(inetAddr,port);
fd.s = s;
fd.setOptions();
fd.is = s.getInputStream();
fd.os = s.getOutputStream();
break;
}
case SocketFD.TYPE_DGRAM:
break;
default:
throw new Error("should never happen");
}
} catch(IOException e) {
return -ECONNREFUSED;
}
return 0;
}
private int sys_resolve_hostname(int chostname, int addr, int sizeAddr) throws FaultException {
String hostname = cstring(chostname);
int size = memRead(sizeAddr);
InetAddress[] inetAddrs;
try {
inetAddrs = InetAddress.getAllByName(hostname);
} catch(UnknownHostException e) {
return HOST_NOT_FOUND;
}
int count = min(size/4,inetAddrs.length);
for(int i=0; i<count; i++,addr+=4) {
byte[] b = inetAddrs[i].getAddress();
copyout(b,addr,4);
}
memWrite(sizeAddr,count*4);
return 0;
}
private int sys_setsockopt(int fdn, int level, int name, int valaddr, int len) throws ReadFaultException, ErrnoException {
SocketFD fd = getSocketFD(fdn);
switch(level) {
case SOL_SOCKET:
switch(name) {
case SO_REUSEADDR:
case SO_KEEPALIVE: {
if(len != 4) return -EINVAL;
int val = memRead(valaddr);
if(val != 0) fd.options |= name;
else fd.options &= ~name;
fd.setOptions();
return 0;
}
default:
if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
return -ENOPROTOOPT;
}
default:
if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
return -ENOPROTOOPT;
}
}
private int sys_getpeername(int socketDescriptor, int ptrSockName, int ptrNameLength) throws FaultException, ErrnoException
{
SocketFD fd = getSocketFD(socketDescriptor);
InetSocketAddress isa = (InetSocketAddress) fd.s.getRemoteSocketAddress();
return getfooonamehelper(isa, ptrSockName, ptrNameLength);
}
private int sys_getsockname(int socketDescriptor, int ptrSockName, int ptrNameLength) throws FaultException, ErrnoException
{
SocketFD fd = getSocketFD(socketDescriptor);
InetSocketAddress isa = (InetSocketAddress) fd.getLocalSocketAddress();
return getfooonamehelper(isa, ptrSockName, ptrNameLength);
}
private int getfooonamehelper(InetSocketAddress isa, int ptrSockName, int ptrNameLength) throws FaultException, ErrnoException
{
int length = 8;
int bufferSize = memRead(ptrNameLength);
byte[] ia = isa.getAddress().getAddress();
int port = isa.getPort();
/*
byte sin_len
byte sin_family
short sin_port
int sin_addr
*/
int dword1 = ((length & 0xff) << 24) | ((AF_INET & 0xff) << 16) | ( (port & 0xffff) << 0);
int dword2 = (ia[0] << 24) | (ia[1] << 16) | (ia[2] << 8) | (ia[3] << 0);
memWrite(ptrNameLength, length);
if (bufferSize == 0) {
return 0;
}
if (bufferSize < 4) {
int oldDword1 = memRead(ptrSockName);
int lowermask = (1 << bufferSize * 8) - 1;
int highermask = -1 - lowermask;
dword1 = (oldDword1 & highermask) | (dword1 & lowermask);
}
memWrite(ptrSockName, dword1);
if (bufferSize < 8) {
int oldDword2 = memRead(ptrSockName+4);
int lowermask = (1 << (bufferSize - 4) * 8) - 1;
int highermask = -1 - lowermask;
dword2 = (oldDword2 & highermask) | (dword2 & lowermask);
}
memWrite(ptrSockName + 4, dword2);
return 0;
}
private int sys_getsockopt(int fdn, int level, int name, int valaddr, int lenaddr) throws ErrnoException, FaultException {
SocketFD fd = getSocketFD(fdn);
switch(level) {
case SOL_SOCKET:
switch(name) {
case SO_REUSEADDR:
case SO_KEEPALIVE: {
int len = memRead(lenaddr);
if(len < 4) return -EINVAL;
int val = (fd.options & name) != 0 ? 1 : 0;
memWrite(valaddr,val);
memWrite(lenaddr,4);
return 0;
}
default:
if(STDERR_DIAG) System.err.println("Unknown setsockopt name passed: " + name);
return -ENOPROTOOPT;
}
default:
if(STDERR_DIAG) System.err.println("Unknown setsockopt leve passed: " + level);
return -ENOPROTOOPT;
}
}
private int sys_bind(int fdn, int addr, int namelen) throws FaultException, ErrnoException {
SocketFD fd = getSocketFD(fdn);
if(fd.type() == SocketFD.TYPE_STREAM && (fd.s != null || fd.ss != null)) return -EISCONN;
int word1 = memRead(addr);
if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
int port = word1 & 0xffff;
InetAddress inetAddr = null;
if(memRead(addr+4) != 0) {
byte[] ip = new byte[4];
copyin(addr+4,ip,4);
try {
inetAddr = Platform.inetAddressFromBytes(ip);
} catch(UnknownHostException e) {
return -EADDRNOTAVAIL;
}
}
switch(fd.type()) {
case SocketFD.TYPE_STREAM: {
fd.bindAddr = inetAddr;
fd.bindPort = port;
return 0;
}
case SocketFD.TYPE_DGRAM: {
if(fd.ds != null) fd.ds.close();
try {
fd.ds = inetAddr != null ? new DatagramSocket(port,inetAddr) : new DatagramSocket(port);
} catch(IOException e) {
return -EADDRINUSE;
}
return 0;
}
default:
throw new Error("should never happen");
}
}
private int sys_listen(int fdn, int backlog) throws ErrnoException {
SocketFD fd = getSocketFD(fdn);
if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
if(fd.ss != null || fd.s != null) return -EISCONN;
if(fd.bindPort < 0) return -EOPNOTSUPP;
try {
fd.ss = new ServerSocket(fd.bindPort,backlog,fd.bindAddr);
fd.flags |= SocketFD.LISTEN;
return 0;
} catch(IOException e) {
return -EADDRINUSE;
}
}
private int sys_accept(int fdn, int addr, int lenaddr) throws ErrnoException, FaultException {
SocketFD fd = getSocketFD(fdn);
if(fd.type() != SocketFD.TYPE_STREAM) return -EOPNOTSUPP;
if(!fd.listen()) return -EOPNOTSUPP;
int size = memRead(lenaddr);
ServerSocket s = fd.ss;
Socket client;
try {
client = s.accept();
} catch(IOException e) {
return -EIO;
}
if(size >= 8) {
memWrite(addr,(6 << 24) | (AF_INET << 16) | client.getPort());
byte[] b = client.getInetAddress().getAddress();
copyout(b,addr+4,4);
memWrite(lenaddr,8);
}
SocketFD clientFD = new SocketFD(SocketFD.TYPE_STREAM);
clientFD.s = client;
try {
clientFD.is = client.getInputStream();
clientFD.os = client.getOutputStream();
} catch(IOException e) {
return -EIO;
}
int n = addFD(clientFD);
if(n == -1) {
clientFD.close();
return -ENFILE;
}
return n;
}
private int sys_shutdown(int fdn, int how) throws ErrnoException {
SocketFD fd = getSocketFD(fdn);
if(fd.type() != SocketFD.TYPE_STREAM || fd.listen()) return -EOPNOTSUPP;
if(fd.s == null) return -ENOTCONN;
Socket s = fd.s;
try {
if(how == SHUT_RD || how == SHUT_RDWR) Platform.socketHalfClose(s,false);
if(how == SHUT_WR || how == SHUT_RDWR) Platform.socketHalfClose(s,true);
} catch(IOException e) {
return -EIO;
}
return 0;
}
private int sys_sendto(int fdn, int addr, int count, int flags, int destAddr, int socklen) throws ErrnoException,ReadFaultException {
SocketFD fd = getSocketFD(fdn);
if(flags != 0) throw new ErrnoException(EINVAL);
int word1 = memRead(destAddr);
if( ((word1 >>> 16)&0xff) != AF_INET) return -EAFNOSUPPORT;
int port = word1 & 0xffff;
InetAddress inetAddr;
byte[] ip = new byte[4];
copyin(destAddr+4,ip,4);
try {
inetAddr = Platform.inetAddressFromBytes(ip);
} catch(UnknownHostException e) {
return -EADDRNOTAVAIL;
}
count = Math.min(count,MAX_CHUNK);
byte[] buf = byteBuf(count);
copyin(addr,buf,count);
try {
return fd.sendto(buf,0,count,inetAddr,port);
} catch(ErrnoException e) {
if(e.errno == EPIPE) exit(128+13,true);
throw e;
}
}
private int sys_recvfrom(int fdn, int addr, int count, int flags, int sourceAddr, int socklenAddr) throws ErrnoException, FaultException {
SocketFD fd = getSocketFD(fdn);
if(flags != 0) throw new ErrnoException(EINVAL);
InetAddress[] inetAddr = sourceAddr == 0 ? null : new InetAddress[1];
int[] port = sourceAddr == 0 ? null : new int[1];
count = Math.min(count,MAX_CHUNK);
byte[] buf = byteBuf(count);
int n = fd.recvfrom(buf,0,count,inetAddr,port);
copyout(buf,addr,n);
if(sourceAddr != 0) {
memWrite(sourceAddr,(AF_INET << 16) | port[0]);
byte[] ip = inetAddr[0].getAddress();
copyout(ip,sourceAddr+4,4);
}
return n;
}
private int sys_select(int n, int readFDs, int writeFDs, int exceptFDs, int timevalAddr) throws ReadFaultException, ErrnoException {
return -ENOSYS;
}
private static String hostName() {
try {
return InetAddress.getLocalHost().getHostName();
} catch(UnknownHostException e) {
return "darkstar";
}
}
private int sys_sysctl(int nameaddr, int namelen, int oldp, int oldlenaddr, int newp, int newlen) throws FaultException {
if(newp != 0) return -EPERM;
if(namelen == 0) return -ENOENT;
if(oldp == 0) return 0;
Object o = null;
switch(memRead(nameaddr)) {
case CTL_KERN:
if(namelen != 2) break;
switch(memRead(nameaddr+4)) {
case KERN_OSTYPE:
o = "NestedVM";
break;
case KERN_HOSTNAME:
o = hostName();
break;
case KERN_OSRELEASE:
o = VERSION;
break;
case KERN_VERSION:
o = "NestedVM Kernel Version " + VERSION;
break;
}
break;
case CTL_HW:
if(namelen != 2) break;
switch(memRead(nameaddr+4)) {
case HW_MACHINE:
o = "NestedVM Virtual Machine";
break;
}
break;
}
if(o == null) return -ENOENT;
int len = memRead(oldlenaddr);
if(o instanceof String) {
byte[] b = getNullTerminatedBytes((String)o);
if(len < b.length) return -ENOMEM;
len = b.length;
copyout(b,oldp,len);
memWrite(oldlenaddr,len);
} else if(o instanceof Integer) {
if(len < 4) return -ENOMEM;
memWrite(oldp,((Integer)o).intValue());
} else {
throw new Error("should never happen");
}
return 0;
}
public static final class GlobalState {
Hashtable<String,GlobalState.CacheEnt> execCache = new Hashtable<String,GlobalState.CacheEnt>();
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() {
this(255);
}
public GlobalState(int maxProcs) {
this(maxProcs,true);
}
public GlobalState(int maxProcs, boolean defaultMounts) {
tasks = new UnixRuntime[maxProcs+1];
if(defaultMounts) {
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());
addMount("/cygdrive",new CygdriveFS());
}
}
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;
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);
Sort.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 static class FSPathPair {
private final FS filesystem;
private final String path;
public FSPathPair(FS filesystem, String path) {
this.filesystem = filesystem;
this.path = path;
}
public String getPath() {
return path;
}
public FS getFS() {
return filesystem;
}
}
private FSPathPair findFS(String normalizedPath) {
int pathLength = normalizedPath.length();
if (pathLength != 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) && (pathLength == mpl || normalizedPath.charAt(mpl) == '/')) {
return new FSPathPair(mp.fs, pathLength == mpl ? "" : normalizedPath.substring(mpl+1));
}
}
}
return new FSPathPair(root, normalizedPath);
}
private Object fsop(int op, UnixRuntime r, String normalizedPath1, String normalizedPath2, int arg1, int arg2) throws ErrnoException {
// We need to dispatch to the right filesystem.
switch(op) {
case FS.LINK:
// Both paths must be in the same filesystem
FSPathPair lookup1 = findFS(normalizedPath1), lookup2 = findFS(normalizedPath2);
FS fs1 = lookup1.getFS(), fs2 = lookup2.getFS();
if (fs1 != fs2) {
throw new ErrnoException(EXDEV);
}
return fs1.dispatch(op,r,lookup1.getPath(), lookup2.getPath(), arg1, arg2);
default:
throw new IllegalArgumentException("Unsupported operation: " + Integer.toString(op));
}
}
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 || normalizedPath.charAt(mpl) == '/'))
return mp.fs.dispatch(op,r,pl == mpl ? "" : normalizedPath.substring(mpl+1),arg1,arg2);
}
}
return root.dispatch(op,r,normalizedPath,arg1,arg2);
}
public final FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
return (FD) fsop(FS.OPEN,r,path,flags,mode);
}
public final FStat stat(UnixRuntime r, String path) throws ErrnoException {
return (FStat) fsop(FS.STAT,r,path,0,0);
}
public final FStat lstat(UnixRuntime r, String path) throws ErrnoException {
return (FStat) fsop(FS.LSTAT,r,path,0,0);
}
public final void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
fsop(FS.MKDIR,r,path,mode,0);
}
public final void rmdir(UnixRuntime r, String path) throws ErrnoException {
fsop(FS.RMDIR,r,path,0,0);
}
public final void unlink(UnixRuntime r, String path) throws ErrnoException {
fsop(FS.UNLINK,r,path,0,0);
}
public final void link(UnixRuntime r, String oldpath, String newpath) throws ErrnoException {
fsop(FS.LINK,r,oldpath,newpath, 0, 0);
}
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 abstract static class FS {
static final int OPEN = 1;
static final int STAT = 2;
static final int LSTAT = 3;
static final int MKDIR = 4;
static final int UNLINK = 5;
static final int RMDIR = 6;
static final int LINK = 7;
GlobalState owner;
int devno;
Object dispatch(int op, UnixRuntime r, String path, int arg1, int arg2) throws ErrnoException {
switch(op) {
case OPEN:
return open(r,path,arg1,arg2);
case STAT:
return stat(r,path);
case LSTAT:
return lstat(r,path);
case MKDIR:
mkdir(r,path,arg1);
return null;
case UNLINK:
unlink(r,path);
return null;
case RMDIR:
rmdir(r,path);
return null;
default:
throw new IllegalArgumentException("Invalid FSOP: " + Integer.toString(op));
}
}
Object dispatch(int op, UnixRuntime r, String path1, String path2, int arg1, int arg2) throws ErrnoException {
switch(op) {
case LINK:
link(r, path1, path2);
return null;
default:
throw new IllegalArgumentException("Invalid FSOP: " + Integer.toString(op));
}
}
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;
public abstract void rmdir(UnixRuntime r, String path) throws ErrnoException;
public abstract void link(UnixRuntime r, String oldpath, String newpath) throws ErrnoException;
}
// chroot support should go in here if it is ever implemented
private String normalizePath(String path) {
boolean absolute = path.startsWith("/");
int cwdl = cwd.length();
// NOTE: This isn't just a fast path, it handles cases the code below doesn't
if(!path.startsWith(".") && path.indexOf("./") == -1 && path.indexOf("//") == -1 && !path.endsWith("."))
return absolute ? path.substring(1) : cwdl == 0 ? path : path.length() == 0 ? cwd : cwd + "/" + path;
char[] in = new char[path.length()+1];
char[] out = new char[in.length + (absolute ? -1 : cwd.length())];
path.getChars(0,path.length(),in,0);
int inp=0, outp=0;
if(absolute) {
do {
inp++;
}
while(in[inp] == '/');
} else if(cwdl != 0) {
cwd.getChars(0,cwdl,out,0);
outp = cwdl;
}
while(in[inp] != 0) {
if(inp != 0) {
while(in[inp] != 0 && in[inp] != '/') {
out[outp++] = in[inp++];
}
if(in[inp] == '\0') break;
while(in[inp] == '/') inp++;
}
// Just read a /
if(in[inp] == '\0') break;
if(in[inp] != '.') {
out[outp++] = '/';
out[outp++] = in[inp++];
continue;
}
// Just read a /.
if(in[inp+1] == '\0' || in[inp+1] == '/') {
inp++;
continue;
}
if(in[inp+1] == '.' && (in[inp+2] == '\0' || in[inp+2] == '/')) { // ..
// Just read a /..{$,/}
inp += 2;
if(outp > 0) outp--;
while(outp > 0 && out[outp] != '/') outp--;
//System.err.println("After ..: " + new String(out,0,outp));
continue;
}
// Just read a /.[^.] or /..[^/$]
inp++;
out[outp++] = '/';
out[outp++] = '.';
}
if(outp > 0 && out[outp-1] == '/') outp--;
//System.err.println("normalize: " + path + " -> " + new String(out,0,outp) + " (cwd: " + cwd + ")");
int outStart = out[0] == '/' ? 1 : 0;
return new String(out,outStart,outp - outStart);
}
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() == '!';
}
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);
}
public static class HostFS extends FS {
InodeCache inodes = new InodeCache(4000);
protected File root;
public File getRoot() {
return root;
}
protected File hostFile(String path) {
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(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);
}
public void rmdir(UnixRuntime r, String path) throws ErrnoException {
unlink(r, path);
}
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()) {
// Can't delete file immediately, so mark for
// delete on close all matching FDs
boolean marked = false;
for(int i=0; i<OPEN_MAX; i++) {
if(r.fds[i] != null) {
String fdpath = r.fds[i].getNormalizedPath();
if(fdpath != null && fdpath.equals(path)) {
r.fds[i].markDeleteOnClose();
marked = true;
}
}
}
if(!marked) throw new ErrnoException(EPERM);
}
}
public void link(UnixRuntime r, String oldpath, String newpath) throws ErrnoException {
try {
Files.createLink(hostFile(newpath).toPath(), hostFile(oldpath).toPath());
} catch (IOException ex) {
throw new ErrnoException(EIO);
}
}
public FStat stat(UnixRuntime r, String path) throws ErrnoException {
File f = hostFile(path);
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(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 = getParentFile(f);
if(parent!=null && (!parent.exists() || !parent.isDirectory())) throw new ErrnoException(ENOTDIR);
if(!f.mkdir()) throw new ErrnoException(EIO);
}
private static File getParentFile(File f) {
String p = f.getParent();
return p == null ? null : new File(p);
}
public class HostDirFD extends DirFD {
private final File f;
private final File[] children;
public HostDirFD(File f) {
this.f = f;
String[] l = f.list();
children = new File[l.length];
for(int i=0; i<l.length; i++) children[i] = new File(f,l[i]);
}
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 = getParentFile(f);
// HACK: myInode() isn't really correct if we're not the root
return parent == null ? myInode() : inodes.get(parent.getAbsolutePath());
}
public int myInode() {
return inodes.get(f.getAbsolutePath());
}
public int myDev() {
return devno;
}
}
}
/* Implements the Cygwin notation for accessing MS Windows drive letters
* in a unix path. The path /cygdrive/c/myfile is converted to C:\file.
* As there is no POSIX standard for this, little checking is done. */
public static class CygdriveFS extends HostFS {
protected File hostFile(String path) {
java.util.logging.Logger.getLogger(CygdriveFS.class.getName()).fine("path = " + path);
final char drive = path.charAt(0);
if (drive < 'a' || drive > 'z' || (path.length() > 1 && path.charAt(1) != '/'))
return null;
if (path.length() == 1) {
path = path + "/";
}
path = drive + ":" + path.substring(1).replace('/', '\\');
java.util.logging.Logger.getLogger(CygdriveFS.class.getName()).fine("path new = " + path);
return new File(path);
}
public CygdriveFS() {
super("/");
}
}
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 abstract int parentInode();
protected abstract int myInode();
public int flags() {
return O_RDONLY;
}
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();
}
};
}
}
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 abstract 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;
}
public abstract int inode();
}
private abstract class DevDirFD extends DirFD {
public int myDev() {
return devno;
}
}
private FD devZeroFD = new FD() {
public int read(byte[] a, int off, int length) {
/*Arrays.fill(a,off,off+length,(byte)0);*/
for(int i=off; i<off+length; i++) a[i] = 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;
}
};
}
public int flags() {
return O_RDWR;
}
};
private FD devNullFD = new FD() {
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 int flags() {
return O_RDWR;
}
};
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/")) {
int n;
try {
n = Integer.parseInt(path.substring(3));
} catch(NumberFormatException e) {
return null;
}
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(r.fds[i] != null) {
count++;
}
final int[] files = new int[count];
count = 0;
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("")) {
return new DevDirFD() {
public int myInode() {
return ROOT_INODE;
}
// HACK: We don't have any clean way to get the parent inode
public int parentInode() {
return ROOT_INODE;
}
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;
}
};
}
return null;
}
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/")) {
int n;
try {
n = Integer.parseInt(path.substring(3));
} catch(NumberFormatException e) {
return null;
}
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 inode() {
return FD_INODE;
}
public int dev() {
return devno;
}
public int type() {
return S_IFDIR;
}
public int mode() {
return 0444;
}
};
if(path.equals("")) return new FStat() {
public int inode() {
return ROOT_INODE;
}
public int dev() {
return devno;
}
public int type() {
return S_IFDIR;
}
public int mode() {
return 0444;
}
};
return null;
}
public void mkdir(UnixRuntime r, String path, int mode) throws ErrnoException {
throw new ErrnoException(EROFS);
}
public void rmdir(UnixRuntime r, String path) throws ErrnoException {
throw new ErrnoException(EROFS);
}
public void unlink(UnixRuntime r, String path) throws ErrnoException {
throw new ErrnoException(EROFS);
}
public void link(UnixRuntime r, String oldpath, String newpath) throws ErrnoException {
throw new ErrnoException(EROFS);
}
}
public static class ResourceFS extends FS {
final InodeCache inodes = new InodeCache(500);
public FStat lstat(UnixRuntime r, String path) throws ErrnoException {
return stat(r,path);
}
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);
}
public void rmdir(UnixRuntime r, String path) throws ErrnoException {
throw new ErrnoException(EROFS);
}
public void link(UnixRuntime r, String oldpath, String newpath) throws ErrnoException {
throw new ErrnoException(EROFS);
}
FStat connFStat(final URLConnection conn) {
return new FStat() {
public int type() {
return S_IFREG;
}
public int nlink() {
return 1;
}
public int mode() {
return 0444;
}
public int size() {
return conn.getContentLength();
}
public int mtime() {
return (int)(conn.getDate() / 1000);
}
public int inode() {
return inodes.get(conn.getURL().toString());
}
public int dev() {
return devno;
}
};
}
public FStat stat(UnixRuntime r, String path) throws ErrnoException {
URL url = r.getClass().getResource("/" + path);
if(url == null) return null;
try {
return connFStat(url.openConnection());
} catch(IOException e) {
throw new ErrnoException(EIO);
}
}
public FD open(UnixRuntime r, String path, int flags, int mode) throws ErrnoException {
if((flags & ~3) != 0) {
if(STDERR_DIAG)
System.err.println("WARNING: Unsupported flags passed to ResourceFS.open(\"" + path + "\"): " + toHex(flags & ~3));
throw new ErrnoException(ENOTSUP);
}
if((flags&3) != RD_ONLY) throw new ErrnoException(EROFS);
URL url = r.getClass().getResource("/" + path);
if(url == null) return null;
try {
final URLConnection conn = url.openConnection();
Seekable.InputStream si = new Seekable.InputStream(conn.getInputStream());
return new SeekableFD(si,flags) {
protected FStat _fstat() {
return connFStat(conn);
}
};
} catch(FileNotFoundException e) {
if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) throw new ErrnoException(EACCES);
return null;
} catch(IOException e) {
throw new ErrnoException(EIO);
}
}
}
}
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