[Ravenwood] Make Os.stat() family available

Add Ravenwood support for stat, lstat, and fstat.

Bug: 350811257
Test: atest RavenwoodRuntimeTest
Flag: TEST_ONLY (ravenwood)
Merged-in: I7c13021f539a38b3eb493ddbf3c04eadd5d8ef81
Change-Id: I7c13021f539a38b3eb493ddbf3c04eadd5d8ef81

5 files changed, 383 insertions, 1 deletions

diff --git a/ravenwood/runtime-helper-src/libcore-fake/android/system/Os.java b/ravenwood/runtime-helper-src/libcore-fake/android/system/Os.java
index e031eb27513b..8a1fe62db4e1 100644
--- a/ravenwood/runtime-helper-src/libcore-fake/android/system/Os.java
+++ b/ravenwood/runtime-helper-src/libcore-fake/android/system/Os.java
@@ -30,7 +30,6 @@ public final class Os {
         return RavenwoodRuntimeNative.lseek(fd, offset, whence);
     }
 
-
     public static FileDescriptor[] pipe2(int flags) throws ErrnoException {
         return RavenwoodRuntimeNative.pipe2(flags);
     }
@@ -42,4 +41,16 @@ public final class Os {
     public static int fcntlInt(FileDescriptor fd, int cmd, int arg) throws ErrnoException {
         return RavenwoodRuntimeNative.fcntlInt(fd, cmd, arg);
     }
+
+    public static StructStat fstat(FileDescriptor fd) throws ErrnoException {
+        return RavenwoodRuntimeNative.fstat(fd);
+    }
+
+    public static StructStat lstat(String path) throws ErrnoException {
+        return RavenwoodRuntimeNative.lstat(path);
+    }
+
+    public static StructStat stat(String path) throws ErrnoException {
+        return RavenwoodRuntimeNative.stat(path);
+    }
 }
diff --git a/ravenwood/runtime-helper-src/libcore-fake/android/system/StructStat.java b/ravenwood/runtime-helper-src/libcore-fake/android/system/StructStat.java
new file mode 100644
index 000000000000..a8b1fca464dd
--- /dev/null
+++ b/ravenwood/runtime-helper-src/libcore-fake/android/system/StructStat.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.system;
+
+import libcore.util.Objects;
+
+/**
+ * File information returned by {@link Os#fstat}, {@link Os#lstat}, and {@link Os#stat}.
+ * Corresponds to C's {@code struct stat} from {@code <stat.h>}.
+ */
+public final class StructStat {
+    /** Device ID of device containing file. */
+    public final long st_dev; /*dev_t*/
+
+    /** File serial number (inode). */
+    public final long st_ino; /*ino_t*/
+
+    /** Mode (permissions) of file. */
+    public final int st_mode; /*mode_t*/
+
+    /** Number of hard links to the file. */
+    public final long st_nlink; /*nlink_t*/
+
+    /** User ID of file. */
+    public final int st_uid; /*uid_t*/
+
+    /** Group ID of file. */
+    public final int st_gid; /*gid_t*/
+
+    /** Device ID (if file is character or block special). */
+    public final long st_rdev; /*dev_t*/
+
+    /**
+     * For regular files, the file size in bytes.
+     * For symbolic links, the length in bytes of the pathname contained in the symbolic link.
+     * For a shared memory object, the length in bytes.
+     * For a typed memory object, the length in bytes.
+     * For other file types, the use of this field is unspecified.
+     */
+    public final long st_size; /*off_t*/
+
+    /** Seconds part of time of last access. */
+    public final long st_atime; /*time_t*/
+
+    /** StructTimespec with time of last access. */
+    public final StructTimespec st_atim;
+
+    /** Seconds part of time of last data modification. */
+    public final long st_mtime; /*time_t*/
+
+    /** StructTimespec with time of last modification. */
+    public final StructTimespec st_mtim;
+
+    /** Seconds part of time of last status change */
+    public final long st_ctime; /*time_t*/
+
+    /** StructTimespec with time of last status change. */
+    public final StructTimespec st_ctim;
+
+    /**
+     * A file system-specific preferred I/O block size for this object.
+     * For some file system types, this may vary from file to file.
+     */
+    public final long st_blksize; /*blksize_t*/
+
+    /** Number of blocks allocated for this object. */
+    public final long st_blocks; /*blkcnt_t*/
+
+    /**
+     * Constructs an instance with the given field values.
+     */
+    public StructStat(long st_dev, long st_ino, int st_mode, long st_nlink, int st_uid, int st_gid,
+            long st_rdev, long st_size, long st_atime, long st_mtime, long st_ctime,
+            long st_blksize, long st_blocks) {
+        this(st_dev, st_ino, st_mode, st_nlink, st_uid, st_gid,
+                st_rdev, st_size, new StructTimespec(st_atime, 0L), new StructTimespec(st_mtime, 0L),
+                new StructTimespec(st_ctime, 0L), st_blksize, st_blocks);
+    }
+
+    /**
+     * Constructs an instance with the given field values.
+     */
+    public StructStat(long st_dev, long st_ino, int st_mode, long st_nlink, int st_uid, int st_gid,
+            long st_rdev, long st_size, StructTimespec st_atim, StructTimespec st_mtim,
+            StructTimespec st_ctim, long st_blksize, long st_blocks) {
+        this.st_dev = st_dev;
+        this.st_ino = st_ino;
+        this.st_mode = st_mode;
+        this.st_nlink = st_nlink;
+        this.st_uid = st_uid;
+        this.st_gid = st_gid;
+        this.st_rdev = st_rdev;
+        this.st_size = st_size;
+        this.st_atime = st_atim.tv_sec;
+        this.st_mtime = st_mtim.tv_sec;
+        this.st_ctime = st_ctim.tv_sec;
+        this.st_atim = st_atim;
+        this.st_mtim = st_mtim;
+        this.st_ctim = st_ctim;
+        this.st_blksize = st_blksize;
+        this.st_blocks = st_blocks;
+    }
+
+    @Override public String toString() {
+        return Objects.toString(this);
+    }
+}
diff --git a/ravenwood/runtime-helper-src/libcore-fake/android/system/StructTimespec.java b/ravenwood/runtime-helper-src/libcore-fake/android/system/StructTimespec.java
new file mode 100644
index 000000000000..c10678057eeb
--- /dev/null
+++ b/ravenwood/runtime-helper-src/libcore-fake/android/system/StructTimespec.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.system;
+
+import libcore.util.Objects;;
+
+/**
+ * Corresponds to C's {@code struct timespec} from {@code <time.h>}.
+ */
+public final class StructTimespec implements Comparable<StructTimespec> {
+    /** Seconds part of time of last data modification. */
+    public final long tv_sec; /*time_t*/
+
+    /** Nanoseconds (values are [0, 999999999]). */
+    public final long tv_nsec;
+
+    public StructTimespec(long tv_sec, long tv_nsec) {
+        this.tv_sec = tv_sec;
+        this.tv_nsec = tv_nsec;
+        if (tv_nsec < 0 || tv_nsec > 999_999_999) {
+            throw new IllegalArgumentException(
+                    "tv_nsec value " + tv_nsec + " is not in [0, 999999999]");
+        }
+    }
+
+    @Override
+    public int compareTo(StructTimespec other) {
+        if (tv_sec > other.tv_sec) {
+            return 1;
+        }
+        if (tv_sec < other.tv_sec) {
+            return -1;
+        }
+        if (tv_nsec > other.tv_nsec) {
+            return 1;
+        }
+        if (tv_nsec < other.tv_nsec) {
+            return -1;
+        }
+        return 0;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        StructTimespec that = (StructTimespec) o;
+
+        if (tv_sec != that.tv_sec) return false;
+        return tv_nsec == that.tv_nsec;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = (int) (tv_sec ^ (tv_sec >>> 32));
+        result = 31 * result + (int) (tv_nsec ^ (tv_nsec >>> 32));
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return Objects.toString(this);
+    }
+}
diff --git a/ravenwood/runtime-helper-src/libcore-fake/com/android/ravenwood/common/RavenwoodRuntimeNative.java b/ravenwood/runtime-helper-src/libcore-fake/com/android/ravenwood/common/RavenwoodRuntimeNative.java
new file mode 100644
index 000000000000..e9b305e5d789
--- /dev/null
+++ b/ravenwood/runtime-helper-src/libcore-fake/com/android/ravenwood/common/RavenwoodRuntimeNative.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.ravenwood.common;
+
+import android.system.ErrnoException;
+import android.system.StructStat;
+
+import java.io.FileDescriptor;
+
+/**
+ * Class to host all the JNI methods used in ravenwood runtime.
+ */
+public class RavenwoodRuntimeNative {
+    private RavenwoodRuntimeNative() {
+    }
+
+    static {
+        RavenwoodCommonUtils.ensureOnRavenwood();
+        RavenwoodCommonUtils.loadRavenwoodNativeRuntime();
+    }
+
+    public static native void applyFreeFunction(long freeFunction, long nativePtr);
+
+    private static native long nLseek(int fd, long offset, int whence) throws ErrnoException;
+
+    private static native int[] nPipe2(int flags) throws ErrnoException;
+
+    private static native int nDup(int oldfd) throws ErrnoException;
+
+    private static native int nFcntlInt(int fd, int cmd, int arg) throws ErrnoException;
+
+    private static native StructStat nFstat(int fd) throws ErrnoException;
+
+    public static native StructStat lstat(String path) throws ErrnoException;
+
+    public static native StructStat stat(String path) throws ErrnoException;
+
+    public static long lseek(FileDescriptor fd, long offset, int whence) throws ErrnoException {
+        return nLseek(JvmWorkaround.getInstance().getFdInt(fd), offset, whence);
+    }
+
+    public static FileDescriptor[] pipe2(int flags) throws ErrnoException {
+        var fds = nPipe2(flags);
+        var ret = new FileDescriptor[] {
+                new FileDescriptor(),
+                new FileDescriptor(),
+        };
+        JvmWorkaround.getInstance().setFdInt(ret[0], fds[0]);
+        JvmWorkaround.getInstance().setFdInt(ret[1], fds[1]);
+
+        return ret;
+    }
+
+    public static FileDescriptor dup(FileDescriptor fd) throws ErrnoException {
+        var fdInt = nDup(JvmWorkaround.getInstance().getFdInt(fd));
+
+        var retFd = new java.io.FileDescriptor();
+        JvmWorkaround.getInstance().setFdInt(retFd, fdInt);
+        return retFd;
+    }
+
+    public static int fcntlInt(FileDescriptor fd, int cmd, int arg) throws ErrnoException {
+        var fdInt = JvmWorkaround.getInstance().getFdInt(fd);
+
+        return nFcntlInt(fdInt, cmd, arg);
+    }
+
+    public static StructStat fstat(FileDescriptor fd) throws ErrnoException {
+        var fdInt = JvmWorkaround.getInstance().getFdInt(fd);
+
+        return nFstat(fdInt);
+    }
+}
diff --git a/ravenwood/runtime-helper-src/libcore-fake/libcore/util/Objects.java b/ravenwood/runtime-helper-src/libcore-fake/libcore/util/Objects.java
new file mode 100644
index 000000000000..3781fcf4e891
--- /dev/null
+++ b/ravenwood/runtime-helper-src/libcore-fake/libcore/util/Objects.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package libcore.util;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.Arrays;
+
+public final class Objects {
+    private Objects() {}
+
+    /**
+     * Returns a string reporting the value of each declared field, via reflection.
+     * Static and transient fields are automatically skipped. Produces output like
+     * "SimpleClassName[integer=1234,string="hello",character='c',intArray=[1,2,3]]".
+     */
+    public static String toString(Object o) {
+        Class<?> c = o.getClass();
+        StringBuilder sb = new StringBuilder();
+        sb.append(c.getSimpleName()).append('[');
+        int i = 0;
+        for (Field f : c.getDeclaredFields()) {
+            if ((f.getModifiers() & (Modifier.STATIC | Modifier.TRANSIENT)) != 0) {
+                continue;
+            }
+            f.setAccessible(true);
+            try {
+                Object value = f.get(o);
+
+                if (i++ > 0) {
+                    sb.append(',');
+                }
+
+                sb.append(f.getName());
+                sb.append('=');
+
+                if (value.getClass().isArray()) {
+                    if (value.getClass() == boolean[].class) {
+                        sb.append(Arrays.toString((boolean[]) value));
+                    } else if (value.getClass() == byte[].class) {
+                        sb.append(Arrays.toString((byte[]) value));
+                    } else if (value.getClass() == char[].class) {
+                        sb.append(Arrays.toString((char[]) value));
+                    } else if (value.getClass() == double[].class) {
+                        sb.append(Arrays.toString((double[]) value));
+                    } else if (value.getClass() == float[].class) {
+                        sb.append(Arrays.toString((float[]) value));
+                    } else if (value.getClass() == int[].class) {
+                        sb.append(Arrays.toString((int[]) value));
+                    } else if (value.getClass() == long[].class) {
+                        sb.append(Arrays.toString((long[]) value));
+                    } else if (value.getClass() == short[].class) {
+                        sb.append(Arrays.toString((short[]) value));
+                    } else {
+                        sb.append(Arrays.toString((Object[]) value));
+                    }
+                } else if (value.getClass() == Character.class) {
+                    sb.append('\'').append(value).append('\'');
+                } else if (value.getClass() == String.class) {
+                    sb.append('"').append(value).append('"');
+                } else {
+                    sb.append(value);
+                }
+            } catch (IllegalAccessException unexpected) {
+                throw new AssertionError(unexpected);
+            }
+        }
+        sb.append("]");
+        return sb.toString();
+    }
+}