Examples with CCharPointer org.graalvm.nativeimage.c.type.CCharPointer used on opensource projects

Example 6 with CCharPointer

use of org.graalvm.nativeimage.c.type.CCharPointer in project graal by oracle.

the class PosixJavaIOSubstitutions method setPermission.

@Substitute
public boolean setPermission(File f, int access, boolean enable, boolean owneronly) {
    int amode = 0;
    if (access == Target_java_io_FileSystem.ACCESS_READ) {
        amode = owneronly ? S_IRUSR() : S_IRUSR() | S_IRGRP() | S_IROTH();
    } else if (access == Target_java_io_FileSystem.ACCESS_WRITE) {
        amode = owneronly ? S_IWUSR() : S_IWUSR() | S_IWGRP() | S_IWOTH();
    } else if (access == Target_java_io_FileSystem.ACCESS_EXECUTE) {
        amode = owneronly ? S_IXUSR() : S_IXUSR() | S_IXGRP() | S_IXOTH();
    } else {
        throw VMError.shouldNotReachHere("illegal access mode");
    }
    stat stat = StackValue.get(SizeOf.get(stat.class));
    try (CCharPointerHolder pathPin = CTypeConversion.toCString(f.getPath())) {
        CCharPointer pathPtr = pathPin.get();
        if (stat(pathPtr, stat) == 0) {
            int newMode;
            if (enable) {
                newMode = stat.st_mode() | amode;
            } else {
                newMode = stat.st_mode() & ~amode;
            }
            if (chmod(pathPtr, newMode) >= 0) {
                return true;
            }
        }
    }
    return false;
}

Example 7 with CCharPointer

use of org.graalvm.nativeimage.c.type.CCharPointer in project graal by oracle.

the class PosixJavaIOSubstitutions method list.

@Substitute
public String[] list(File f) {
    DIR dir;
    try (CCharPointerHolder pathPin = CTypeConversion.toCString(f.getPath())) {
        CCharPointer pathPtr = pathPin.get();
        dir = opendir(pathPtr);
    }
    if (dir.isNull()) {
        return null;
    }
    List<String> entries = new ArrayList<>();
    dirent dirent = StackValue.get(SizeOf.get(dirent.class) + PATH_MAX() + 1);
    direntPointer resultDirent = StackValue.get(SizeOf.get(direntPointer.class));
    while (readdir_r(dir, dirent, resultDirent) == 0 && !resultDirent.read().isNull()) {
        String name = CTypeConversion.toJavaString(dirent.d_name());
        if (name.equals(".") || name.equals("..")) {
            continue;
        }
        entries.add(name);
    }
    closedir(dir);
    return entries.toArray(new String[entries.size()]);
}

Example 8 with CCharPointer

use of org.graalvm.nativeimage.c.type.CCharPointer in project graal by oracle.

the class PosixJavaLangSubstitutions method forkAndExec.

/*
     * NOTE: This implementation uses simple fork() and exec() calls. However, OpenJDK uses
     * posix_spawn() on some platforms, specifically on Solaris to avoid swap exhaustion when memory
     * is reserved conservatively for the fork'ed process. That implementation is more complex and
     * requires a helper tool to cleanly launch the actual target executable.
     */
@Substitute
@SuppressWarnings({ "unused", "static-method" })
int forkAndExec(int mode, byte[] helperpath, byte[] file, byte[] argBlock, int argCount, byte[] envBlock, int envCount, byte[] dir, int[] fds, boolean redirectErrorStream) throws IOException {
    int[] pipes = new int[8];
    Arrays.fill(pipes, -1);
    try (// 
    PinnedObject filePin = PinnedObject.create(file);
        PinnedObject dirPin = PinnedObject.create(dir);
        PinnedObject argBlockPin = PinnedObject.create(argBlock);
        PinnedObject argvPin = PinnedObject.create(new CCharPointerPointer[argCount + 2]);
        PinnedObject envBlockPin = PinnedObject.create(envBlock);
        PinnedObject envpPin = PinnedObject.create(new CCharPointerPointer[envCount + 1]);
        // 
        PinnedObject pipesPin = PinnedObject.create(pipes)) {
        CCharPointerPointer argv = argvPin.addressOfArrayElement(0);
        argv.write(0, filePin.addressOfArrayElement(0));
        Java_lang_UNIXProcess_Supplement.gatherCStringPointers(argBlockPin.addressOfArrayElement(0), argBlock.length, argv.addressOf(1), argCount + 1);
        CCharPointerPointer envp = WordFactory.nullPointer();
        if (envBlock != null) {
            envp = envpPin.addressOfArrayElement(0);
            Java_lang_UNIXProcess_Supplement.gatherCStringPointers(envBlockPin.addressOfArrayElement(0), envBlock.length, envp.addressOf(0), envCount + 1);
        }
        CIntPointer[] stdioPipes = new CIntPointer[3];
        for (int i = 0; i <= 2; i++) {
            if (fds[i] == -1) {
                stdioPipes[i] = pipesPin.addressOfArrayElement(2 * i);
                if (Unistd.pipe(stdioPipes[i]) < 0) {
                    throw new IOException("pipe() failed");
                }
            }
        }
        CIntPointer failPipe = pipesPin.addressOfArrayElement(2 * stdioPipes.length);
        if (Unistd.pipe(failPipe) < 0) {
            throw new IOException("pipe() failed");
        }
        int[] childStdioFds = new int[3];
        childStdioFds[0] = (fds[0] != -1) ? fds[0] : stdioPipes[0].read(0);
        childStdioFds[1] = (fds[1] != -1) ? fds[1] : stdioPipes[1].read(1);
        childStdioFds[2] = (fds[2] != -1) ? fds[2] : stdioPipes[2].read(1);
        int childFailFd = failPipe.read(1);
        CCharPointer filep = filePin.addressOfArrayElement(0);
        CCharPointer dirp = (dir != null) ? dirPin.addressOfArrayElement(0) : WordFactory.nullPointer();
        int childPid = Java_lang_UNIXProcess_Supplement.doForkAndExec(filep, dirp, argv, envp, childStdioFds, childFailFd);
        if (childPid < 0) {
            throw new IOException("fork() failed");
        }
        // If we are here, we are the parent.
        // store fds of our pipe ends for caller, close unused fds (those of the child)
        fds[0] = fds[1] = fds[2] = -1;
        if (stdioPipes[0].isNonNull()) {
            fds[0] = stdioPipes[0].read(1);
            Unistd.close(stdioPipes[0].read(0));
        }
        if (stdioPipes[1].isNonNull()) {
            fds[1] = stdioPipes[1].read(0);
            Unistd.close(stdioPipes[1].read(1));
        }
        if (stdioPipes[2].isNonNull()) {
            fds[2] = stdioPipes[2].read(0);
            Unistd.close(stdioPipes[2].read(1));
        }
        Unistd.close(failPipe.read(1));
        // read status from child
        final int intSize = SizeOf.get(CIntPointer.class);
        CIntPointer pErrno = StackValue.get(intSize);
        SignedWord failBytes = Java_lang_UNIXProcess_Supplement.readEntirely(failPipe.read(0), pErrno, WordFactory.unsigned(intSize));
        Unistd.close(failPipe.read(0));
        if (failBytes.equal(0)) {
            // success: pipe closed during exec()
            return childPid;
        } else if (failBytes.equal(SizeOf.get(CIntPointer.class))) {
            int errbuflen = 256;
            try (PinnedObject errbuf = PinnedObject.create(new byte[errbuflen])) {
                CCharPointer detailCstr = Errno.strerror_r(pErrno.read(), errbuf.addressOfArrayElement(0), WordFactory.unsigned(errbuflen));
                String detail = CTypeConversion.toJavaString(detailCstr);
                throw new IOException("error=" + pErrno.read() + ", " + detail);
            }
        } else {
            throw new IOException("unexpected data from child");
        }
    } catch (IOException e) {
        // NOTE: not a finally statement because when successful, some pipes need to stay open
        for (int fd : pipes) {
            if (fd != -1) {
                Unistd.close(fd);
            }
        }
        throw e;
    }
}

Example 9 with CCharPointer

use of org.graalvm.nativeimage.c.type.CCharPointer in project graal by oracle.

the class PosixJavaLangSubstitutions method environ.

// This code is derived from the C implementation of the JDK.
@Substitute
static byte[][] environ() {
    CCharPointerPointer environ = LibCHelper.getEnviron();
    int count = 0;
    for (int i = 0; environ.read(i).isNonNull(); i++) {
        /* Ignore corrupted environment variables */
        if (LibC.strchr(environ.read(i), '=').isNonNull()) {
            count++;
        }
    }
    byte[][] result = new byte[count * 2][];
    int j = 0;
    for (int i = 0; environ.read(i).isNonNull(); i++) {
        CCharPointer varBeg = environ.read(i);
        CCharPointer varEnd = LibC.strchr(varBeg, '=');
        /* Ignore corrupted environment variables */
        if (varEnd.isNonNull()) {
            CCharPointer valBeg = varEnd.addressOf(1);
            int varLength = (int) PointerUtils.absoluteDifference(varEnd, varBeg).rawValue();
            int valLength = (int) LibC.strlen(valBeg).rawValue();
            byte[] var = new byte[varLength];
            SubstrateUtil.wrapAsByteBuffer(varBeg, varLength).get(var);
            result[2 * j] = var;
            byte[] val = new byte[valLength];
            SubstrateUtil.wrapAsByteBuffer(valBeg, valLength).get(val);
            result[2 * j + 1] = val;
            j++;
        }
    }
    assert j == count;
    return result;
}

Example 10 with CCharPointer

use of org.graalvm.nativeimage.c.type.CCharPointer in project graal by oracle.

the class PosixJavaLangSubstitutions method uninterruptibleForkAndExec.

@Uninterruptible(reason = "fragile state after fork()")
private static int uninterruptibleForkAndExec(CCharPointer file, CCharPointer dir, CCharPointerPointer argv, CCharPointerPointer envp, int[] stdioFds, int initialFailFd, PointerBase buffer, int buflen, CCharPointer procFdsPath, CCharPointer searchPaths, CCharPointer searchPathSeparator) {
    int childPid;
    childPid = UnistdNoTransitions.fork();
    if (childPid != 0) {
        return childPid;
    }
    // If we are here, we are the child process.
    int failFd = initialFailFd;
    try {
        // In case of an error, we "return" to end up in the finally block below and notify the
        // parent process of the failure.
        final int gotoFinally = -1;
        if (Java_lang_UNIXProcess_Supplement.dup2(stdioFds[0], 0) < 0) {
            return gotoFinally;
        }
        if (Java_lang_UNIXProcess_Supplement.dup2(stdioFds[1], 1) < 0) {
            return gotoFinally;
        }
        if (Java_lang_UNIXProcess_Supplement.dup2(stdioFds[2], 2) < 0) {
            return gotoFinally;
        }
        if (Java_lang_UNIXProcess_Supplement.dup2(failFd, 3) < 0) {
            return gotoFinally;
        }
        failFd = 3;
        // FD_CLOEXEC: close fail pipe on exec() to indicate success to parent
        if (Fcntl.fcntl_no_transition(failFd, Fcntl.F_SETFD(), Fcntl.FD_CLOEXEC()) < 0) {
            return gotoFinally;
        }
        /*
             * opendir() below allocates a file descriptor. We close failFd+1 so it should become
             * the descriptor allocated to opendir() and we can avoid closing it together with the
             * other descriptors.
             */
        final int maxFd = failFd + 1;
        if (UnistdNoTransitions.close(maxFd) < 0) {
            return gotoFinally;
        }
        if (procFdsPath.isNull()) {
            // We have no procfs, resort to close file descriptors by trial and error
            int maxOpenFds = (int) UnistdNoTransitions.sysconf(Unistd._SC_OPEN_MAX());
            for (int fd = maxFd + 1; fd < maxOpenFds; fd++) {
                if (UnistdNoTransitions.close(fd) != 0 && Errno.errno() != Errno.EBADF()) {
                    return gotoFinally;
                }
            }
        } else {
            DIR fddir = Dirent.opendir_no_transition(procFdsPath);
            if (fddir.isNull()) {
                return gotoFinally;
            }
            dirent dirent = WordFactory.pointer(buffer.rawValue());
            direntPointer direntptr = StackValue.get(SizeOf.get(direntPointer.class));
            int status;
            while ((status = Dirent.readdir_r_no_transition(fddir, dirent, direntptr)) == 0 && direntptr.read().isNonNull()) {
                CCharPointerPointer endptr = StackValue.get(SizeOf.get(CCharPointerPointer.class));
                long fd = LibC.strtol(dirent.d_name(), endptr, 10);
                if (fd > maxFd && endptr.read().isNonNull() && endptr.read().read() == '\0') {
                    UnistdNoTransitions.close((int) fd);
                }
            }
            if (status != 0) {
                // readdir_r() does not set errno
                Errno.set_errno(status);
                return gotoFinally;
            }
            Dirent.closedir_no_transition(fddir);
        }
        if (dir.isNonNull()) {
            if (UnistdNoTransitions.chdir(dir) < 0) {
                return gotoFinally;
            }
        }
        CCharPointerPointer actualEnvp = envp;
        if (actualEnvp.isNull()) {
            actualEnvp = LibCHelper.getEnviron();
        }
        if (LibC.strchr(file, '/').isNonNull()) {
            UnistdNoTransitions.execve(argv.read(0), argv, actualEnvp);
        } else {
            // Scan PATH for the file to execute. We cannot use execvpe()
            // because it is a GNU extension that is not universally available.
            final int fileStrlen = (int) LibC.strlen(file).rawValue();
            int stickyErrno = 0;
            final CCharPointerPointer saveptr = StackValue.get(SizeOf.get(CCharPointerPointer.class));
            saveptr.write(WordFactory.nullPointer());
            CCharPointer searchDir = LibC.strtok_r(searchPaths, searchPathSeparator, saveptr);
            while (searchDir.isNonNull()) {
                CCharPointer bufptr = WordFactory.pointer(buffer.rawValue());
                int len0 = (int) LibC.strlen(searchDir).rawValue();
                if (len0 + fileStrlen + 2 > buflen) {
                    Errno.set_errno(Errno.ENAMETOOLONG());
                    continue;
                }
                if (len0 > 0) {
                    LibC.strcpy(bufptr, searchDir);
                    if (bufptr.read(len0 - 1) != '/') {
                        bufptr.write(len0, (byte) '/');
                        len0++;
                    }
                }
                LibC.strcpy(bufptr.addressOf(len0), file);
                UnistdNoTransitions.execve(bufptr, argv, actualEnvp);
                int e = Errno.errno();
                if (e == Errno.EACCES()) {
                    // as exec(): report EACCES unless we succeed later
                    stickyErrno = e;
                } else if (e == Errno.ENOENT() || e == Errno.ENOTDIR() || e == Errno.ELOOP() || e == Errno.ESTALE() || e == Errno.ENODEV() || e == Errno.ETIMEDOUT()) {
                // ignore
                } else {
                    stickyErrno = e;
                    // bad
                    break;
                }
                searchDir = LibC.strtok_r(WordFactory.nullPointer(), searchPathSeparator, saveptr);
            }
            if (stickyErrno != 0) {
                Errno.set_errno(stickyErrno);
            }
        }
    // If we are here, exec certainly failed.
    } catch (Throwable t) {
        Errno.set_errno(Integer.MIN_VALUE);
    } finally {
        try {
            // notify parent of failure
            final int intSize = SizeOf.get(CIntPointer.class);
            CIntPointer pErrno = StackValue.get(intSize);
            pErrno.write(Errno.errno());
            Java_lang_UNIXProcess_Supplement.writeEntirely(failFd, pErrno, WordFactory.unsigned(intSize));
            UnistdNoTransitions.close(failFd);
        } finally {
            UnistdNoTransitions._exit(-1);
        }
    }
    throw VMError.shouldNotReachHere();
}